Restaurant prime cost mastery: the one number that decides whether your restaurant has a future.

Prime cost is the single number that tells you whether your restaurant has a future. Not revenue. Not covers. Not average check. Prime cost — the cost of food and beverage plus the fully-loaded cost of every person who worked the shift, expressed as a percentage of net revenue. If you don't know yesterday's, you can't fix today's. Most owners learn their prime cost six weeks after the fact, in a monthly P&L the accountant emails over. By then the cooks have prepped four more weeks, the schedule has been written eight more times, and any decision the owner could have made on the Monday after the bad week has compounded into a thousand euros of lost EBIT. This post is the full playbook: what prime cost is, the benchmark by service type, the 60-second daily calc, a worked 50-cover bistro example, the diagnostic order when prime cost creeps up, the six levers to bring it back in range, and a 30-day reset for restaurants that have drifted out of healthy territory. nouz computes daily prime cost automatically at close-of-day; the math is simple enough to do by hand once you know what goes into it.

TL;DR

What prime cost is

Prime cost is two numbers added together, then divided by a third. The two numbers on top: cost of goods sold (every euro of food and beverage that left the kitchen or bar as a sold item — proteins, produce, dairy, dry goods, wine, beer, spirits, mixers, garnishes, the disposables that carry the food out the door) and fully-loaded labor cost (every euro paid to anyone who worked in the restaurant that day — back-of-house, front-of-house, owner, manager — including employer social contributions, holiday-pay accrual, and any 13th/14th-month payments your country requires). The number on the bottom: net revenue — gross sales minus VAT minus card transaction fees. The output is a percentage.

Why these two costs and not the other twenty lines in a restaurant P&L? Because prime cost is the slice you can actually move week to week. Rent is fixed for the length of your lease. Insurance renews annually. Utilities track your hours and your equipment, not your decisions. Software is a flat monthly. Marketing is a budget you set. None of those respond to what you do on Tuesday. Prime cost responds — it is the bulk of your controllable cost, and it moves with every supplier choice, every portion served, every shift you schedule, and every cover that walks through the door. Watching prime cost is watching the only part of the P&L where weekly decisions actually change the number.

The full structure looks like this, in order: gross revenue, minus VAT, minus card fees = net revenue. Net revenue minus food COGS, minus beverage COGS, minus variable costs (linens, cleaning, breakage), minus the daily slice of fixed costs (rent, utilities, insurance, software, accounting, owner salary) = EBIT. Prime cost is the food + beverage + labor portion of that, expressed against net revenue. It sits below COGS and labor in the formula but above everything fixed. That is the slice that defines whether the rest of the P&L has anything to work with.

The benchmark by service type

Prime cost benchmarks shift with service type because labor scales with service intensity and food cost shifts with menu complexity. A counter-service quick-eats operation runs lean on both halves; a fine-dining tasting menu carries higher food cost and much higher labor. Here is the band by service type, drawn from a sample of independent operators across Western Europe and cross-referenced against published trade-association ratios from 2025.

Three things to read into the table. First, the food cost and labor cost percentages don't always sum cleanly to the prime cost band — the benchmark gives you the realistic combined range, not the sum of the two extremes. Second, the bands assume the labor line is fully loaded with employer contributions and an honest owner salary; if you're under-counting either, your reported prime cost is artificially low (typically by 6-12 points). Third, two-shift restaurants (lunch + dinner, with a slow afternoon) sit 3-5 points higher than the bands above because you carry labor through a low-revenue trough.

A casual full-service restaurant that runs at 64% prime cost has roughly 36 cents of every net revenue euro left for rent, utilities, insurance, software, accounting, marketing, owner profit, and operating reserve. If rent eats 8-10 points and other fixed costs eat 12-15 points, EBIT lands at 11-16% of net revenue. That is healthy. The same restaurant at 71% prime cost has only 29 cents — and after the same fixed slice, EBIT is somewhere between -1% and +5%. The cafe-restaurant-bakery owners who run on daily prime cost are the ones still trading in their fifth year. Use the restaurant prime cost calculator to see where your current numbers land against the band.

How to calculate it daily

The promise of daily prime cost is that you see it at close of shift, while the day's decisions are still in your head, instead of six weeks later when they're gone. The math is mechanical. Five inputs, sixty seconds at end of shift.

1. Gross revenue from the till — cash and card combined. Pull it from the Z-report or your POS daily summary. (10 seconds.)
2. Today's food + beverage COGS — the cost of every ingredient that left the kitchen or bar. The pragmatic method: count what came in this week and what's left in the walk-in at close, divide by trading days. The precise method: tick off recipe-card costs against today's ticket counts. Pick one and stay consistent. (20 seconds for the pragmatic method on a normalised day; longer the first time you build it.)
3. Today's labor hours, by person, multiplied by their fully-loaded hourly rate — gross wages + employer social contributions + holiday accrual + 13th/14th-month accrual. Include yourself at market rate, whether or not you took the draw today. (20 seconds once you have the loaded rates pre-calculated.)
4. Your VAT rate and card processor rate — configured once, reused every day. The system applies them automatically; you don't re-enter them. (0 seconds after first setup.)
5. Enter the three changing numbers into nouz (or a spreadsheet, or a notebook). The tool computes net revenue, food + bev cost as a %, labor as a %, prime cost as a %, and compares against the benchmark for your service type. (10 seconds in nouz; 60-90 seconds in a spreadsheet.)

Total elapsed time once the routine is built: 60-90 seconds at close. The first time you do it the numbers take 5-8 minutes because you're building the loaded hourly rates and the food cost lookup; from day two onwards it is fast. The discipline is the look, not the calculation. The look is what catches the supplier hike on Tuesday before it compounds across four weeks.

Worked example — 50-cover bistro

Let's walk a single Tuesday at a real-world-style 50-cover neighbourhood bistro. Casual full-service, lunch and dinner, two-shift operation. Standard early-May Tuesday, no special events, weather mild.

Trading. Lunch service does 28 covers; dinner does 38. Average lunch check €19, average dinner check €27. Total covers: 66 (some tables double-turned for lunch). Cash share 22%, card share 78%. VAT applies at 10% on food, 20% on alcoholic drinks; the bistro's drink mix lands the effective blended rate at 12.6%.

Reading the number. 65.2% is the upper edge of the casual full-service band (60-65%). On a single Tuesday this is acceptable — Tuesday is a slower revenue day so labor weighs heavier as a percentage. The same restaurant on a Friday with 95 covers and €2,400 of net revenue would land closer to 60-61% prime cost because revenue scales faster than labor does. What matters is the seven-day average, not the single day. If the trailing 7-day average is sitting at 65%+ on this bistro, the schedule needs reshaping — most likely cutting one FOH hour from the lunch service on quiet weekdays.

What's left after prime cost. 34.8% of net revenue (€475.27) is what the bistro has to cover rent, utilities, insurance, software, accounting, the owner's remaining salary, and any operating profit. If the daily fixed slice is around €390-420, that leaves €55-85 of EBIT for the day. Positive — Tuesday paid for itself with a small margin. A Tuesday at 71% prime cost would have left €18-50 of EBIT, depending on the fixed slice; a Tuesday at 75% would be a loss day.

When prime cost creeps up — diagnose in this order

Prime cost rarely jumps in a single week. It creeps — half a point here, three-quarters of a point there — and after four or five weeks the trailing average is three points above the band and nobody knows exactly where the drift came from. When you spot creep, work through these four diagnostic areas in order. The fixes split clean once you know which area is leaking.

1. Food cost

If food + bev as a % of net revenue has moved up two points or more, check these four causes, fastest first:

• Supplier price hike. Pull last week's invoices and compare unit prices against four weeks ago. Proteins, dairy and produce are the usual movers — a 7-12% jump on beef or butter that nobody flagged at the back door can shift food cost 1-2 points across a month. Confirm with a phone call to the supplier; many will negotiate or substitute a comparable cut at a lower price.
• Portion drift. Walk through the line at the start of service and watch the cooks plate three of your highest-volume dishes. If the protein on the plate looks heavier than the recipe card, you have portion drift — every dish carries 5-15g more than it should, multiplied by 60+ covers a service, multiplied by 28 trading days a month. Re-calibrate scoops, scales, and the verbal expectation at line-up.
• Waste / spoilage. Set up a one-week waste log: every item that gets dumped, written-off, or remade goes in a notebook at close. Most restaurants lose 4-9% of food purchases to waste they never measure. The biggest categories are usually proteins (over-ordered for a slow night), prepped mise that didn't move, and milk/cream that soured before use. The log tells you which lines need a tighter par.
• Theft. The uncomfortable one. Restaurants with no inventory discipline lose 1-3% of food purchases to unauthorised consumption — staff meals not logged, family-and-friends discounts not run through the till, or actual theft. A monthly count of high-value items (premium proteins, wine, spirits) against POS sales surfaces gaps. Don't accuse — show the gap and tighten the controls.

2. Labor cost

If labor as a % of net revenue has moved up two points or more, check these four causes:

• Over-scheduling. Pull the last four weeks of half-hourly POS data and overlay your staff schedule. Look for hour bands where staff hours exceed what revenue can support — typically 14:30-17:30 on weekdays and the first hour of weekend opening. Most restaurants find 4-8 hours of avoidable labor per week here without affecting service.
• Shift creep. The schedule says 17:00-23:00; the cook actually clocked in at 16:30 to prep and didn't clock out until 23:45. Multiply 1.25 extra hours per shift across five cooks across six trading days, all loaded, and that's €600-900/week of labor cost that never made it onto the schedule. Look at actual clock data vs scheduled hours and tighten the discipline.
• No-show coverage. A server calls in sick; you call in a replacement and forget to remove the original shift from the system. Now the original shift is paid as a no-show and the replacement is paid as a regular. Manage your call-outs the same day or you double-pay coverage 3-4 times a month.
• Payroll tax surprises. A new hire pushes you over a contribution threshold; a wage rise in a previous month triggers a higher contribution band; an annual social contribution rate change you didn't adjust for. Ask your accountant to email "the employer-side total" on the most recent payroll and compare against your assumed loaded rates. If the gap is 3 points or more, your loaded rates need updating.

3. Beverage cost

Beverage often gets bundled with food in the prime cost calc, but it deserves its own diagnostic because the failure modes are different:

• Pour discipline. The recipe says 4cl of spirit; the bartender pours 5-6cl by feel. Free-pour bars lose 12-18% of spirit volume to over-pouring vs spec. Either jigger every pour or use a measured pourer; the spirit cost drops within one week.
• Comps. The shift drink, the regular's free glass, the 'I'll send over a round to apologise for the wait.' Each one tiny; the monthly total is usually 2-4% of beverage revenue, and nobody tracks it. Require every comp to be rung through the POS with a comp reason code — not to prevent comps (they're often the right call) but to know what they cost.
• Training pours. The wine rep comes in with three new bottles; the bar staff each try a sample to learn the description for the floor. That is real cost and almost never tracked. Set a monthly training-and-tasting budget (typically 0.5-1% of beverage revenue) and require it to be logged.

4. Revenue side (the easy one to miss)

Prime cost is a ratio. If the numerator (food + labor cost) holds steady but the denominator (net revenue) falls, prime cost goes up without any cost actually moving. Four causes to check:

• Average check dropped. Pull average check by daypart for the last 8 weeks. If lunch dropped from €19 to €17 because customers stopped adding a side or a drink, that's a 10% revenue compression with no obvious flag. Look at category mix on the POS — which line stopped selling?
• Covers down. Did 78 covers a day become 71 over the last four weeks? Weather, seasonality, a new competitor down the street, a review that went sour. Cover counts are the leading indicator; if they're soft, prime cost % will inflate even if every cost line is held.
• Comps up. Cover counts steady, prime cost still rising — check whether comp value is up. If you comped €420 last month and €680 this month, that's €260 of revenue that left the books but the labor and food that produced those covers stayed in the cost line.
• Pricing. Did you raise menu prices six months ago when supplier costs went up? If not, every supplier rise since has been absorbed straight into food cost %. Re-cost the menu every quarter against current invoices; raise prices on the items where the gap is widest.

The weekly review that catches creep early

Daily prime cost tells you whether yesterday was healthy. The weekly review tells you whether the seven days are trending toward trouble. The discipline is a 20-minute ritual on Monday morning before service starts.

Put four columns on a piece of paper or a simple spreadsheet: day of week, net revenue, covers, prime cost %. Fill in the last seven trading days. The shape tells you almost everything:

• If the weekend prime cost is climbing (a Saturday that used to land at 58% now lands at 63%), labor is over-scheduled on your highest-revenue day — usually a third FOH brought in for a Saturday that hasn't actually picked up cover counts.
• If the weekday prime cost is climbing (a Tuesday that used to land at 65% now lands at 72%), the schedule is carrying the slow lunch + slow afternoon at the same staffing level as a busy week. Cut one body from the 11:30-15:00 weekday shift and watch what happens.
• If the average check is falling (covers steady, revenue down), the menu mix has drifted — usually a high-margin item that disappeared from the menu or stopped being upsold. Look at the POS category report and ask the team what they've been recommending.
• If the covers themselves are down (the leading indicator), prime cost is going to compound the problem within two weeks if the schedule doesn't flex. Cut weekday labor first; protect the weekend coverage that drives the high-revenue days.

The Monday-morning review is the cheapest insurance in a restaurant. 20 minutes catches drift in week one; the alternative is finding out in week six when the monthly P&L lands and the previous month is already over. Owners who do this weekly almost never see prime cost creep past the band by more than a point or two. Owners who don't see it move 5-8 points before they notice.

Levers to bring prime cost back in range

When the diagnostic points to a real problem and the weekly review confirms a drift, here are the six levers that actually move prime cost. None are exotic; each can be acted on within a fortnight.

1. Portion controls. The single highest-impact food cost lever is portion discipline. Re-weigh every protein on the highest-volume dishes for one week. If portions are heavier than the recipe card by 8-15%, you're giving away 1.5-3 percentage points of food cost. Re-calibrate with the cooks at line-up, demonstrate the correct portion on the plate, and re-check in week two. Most restaurants drop food cost 1-2 points within 30 days of a portion reset.

2. Schedule by demand, not by headcount. Most restaurant schedules are written from staff availability and the unwritten rule that 'there should always be three on.' Look at half-hourly transaction data from your POS and write the schedule around the demand curve. Heavy coverage during service peaks (11:45-14:00 for lunch, 19:00-22:00 for dinner); single coverage during the troughs; the owner or manager covers the genuinely dead 14:30-17:30 weekday slot. Most restaurants find €200-500/week of avoidable labor in this exercise without affecting service quality. Combined with the portion reset, this alone usually pulls prime cost down 2-4 points.

3. Supplier renegotiation. Get one competing quote on each of your top three line items (usually proteins, dairy, produce). Most suppliers will quote without commitment if your monthly volume is above €600 on a category. Even if you stay with your current supplier, the quote gives you leverage. Restaurants that have never asked typically discover they can shave 5-10% off their largest line just by asking — that's 0.5-1.5 percentage points of food cost without changing anything on the plate.

4. Menu engineering — kill the low-margin items. Pull the last 90 days of POS item-level data. Sort by item: number sold, gross revenue, gross margin per cover. You will find some items that sell well but carry low margin (often complex dishes with expensive proteins) and some that carry great margin but barely sell. Cut the low-margin slow-sellers; promote the high-margin items via menu placement, server scripting, and the daily specials board. A focused 16-item menu beats a sprawling 28-item menu on food cost almost every time. The 90-day menu engineering quadrant walks through the full method.

5. Upsell training. The difference between a server who suggests a glass of wine with the entrée and one who doesn't is 8-15% on average check. The difference between a server who suggests dessert and one who doesn't is another 4-8%. Run a 30-minute training before service once a week for a month — script three specific upsells per shift, track who's doing them, celebrate the wins. Average check rises and labor cost as a % falls because the same labor is now producing more revenue.

6. Comp policy tightening. Most restaurants have no written comp policy — the manager comps at their discretion, the server comps if a guest complains, the bartender comps the regulars. Set a monthly comp budget (typically 1.5-3% of net revenue), require every comp to be rung through the POS with a reason code, and review weekly. Most restaurants discover their comp value is 1.5-2x what they assumed. Tightening the policy without becoming hostile to legitimate service recovery is usually 0.5-1 point of net revenue recovered straight to the prime cost ratio.

The 30-day prime cost reset playbook

If your trailing 30-day prime cost is 3-5 points above the band for your service type, here is the week-by-week reset that brings it back without firing anyone or rewriting the menu from scratch.

Week 1 — Measure and recost

The goal of week 1 is to know exactly what you're dealing with. Compute daily prime cost every day for seven days using the 60-second method. Pull every supplier invoice from the last 14 days and recost the top 10 menu items against current prices. Note which dishes are now selling below their target food cost. Set up a waste log: every item dumped or remade goes in a notebook at end of shift. No changes to anything yet — just measure. Most owners are surprised by what week 1 reveals.

Week 2 — Portion reset + supplier quote

Re-calibrate portions on the three highest-volume dishes. Show the cooks the correct portion at the start of week 2 line-up; weigh randomly during service for two days; re-weigh at end of week. Get one competing quote on your top supplier line (proteins or dairy). Use the quote to negotiate with your current supplier — most will match or partially match within two days. Keep measuring daily prime cost. By end of week 2 you should see food cost % move 0.5-1.5 points.

Week 3 — Schedule re-cut

Pull half-hourly POS data and overlay against the current schedule. Identify the 4-8 hours per week of slack — usually weekday afternoon and early-Sunday opening. Re-write next week's schedule with those hours cut. Cross-train where needed so the slow shifts can run on a tighter team without losing service quality. Keep measuring daily prime cost. Labor % should drop 1-2 points within the first week of the new schedule.

Week 4 — Menu engineering + upsell discipline

With three weeks of clean data and the cost lines under control, look at the item-level mix. Cut 2-4 low-margin slow-sellers from the menu. Add one high-margin item you've been thinking about (a side, a dessert, a wine flight). Run a 30-minute upsell training before service three times this week; track upsell rates. Keep measuring daily prime cost. Average check should rise 4-8% within two weeks of upsell discipline taking hold.

By the end of the 30-day reset, a typical casual full-service restaurant that started at 68% prime cost will be running at 63-65% — back inside the band, with a clearer view of what each lever moves. The reset works because it's sequenced. The owner who tries to fix everything in week 1 fixes nothing well. The owner who pulls one lever per week, measures, and adjusts gets a sustained 3-5 point reduction without burning out the team.

How nouz makes prime cost visible daily

Doing the prime cost calc on paper or a spreadsheet works — for a week, sometimes a month. The reason most owners stop is that the spreadsheet doesn't survive a busy week. Two days slip, then four, then the spreadsheet is two weeks out of date and the discipline is gone. nouz exists because the discipline is everything and the friction kills it.

The flow is simple. At close of shift you enter gross revenue (cash and card separately), today's food + beverage COGS, and today's variable labor (your fully-loaded fixed labor and owner salary live in Fixed Costs as monthly amounts; the daily slice is applied automatically). nouz computes net revenue (gross minus VAT minus card fees, with card fees applied only to card revenue), food % of net, labor % of net, prime cost %, and EBIT — all on the home screen, all before you lock up. Weekly and monthly trends are visible without any extra entry.

The 60-second daily entry becomes a 4-minute ritual when you account for the close-of-day count and the labor verification. It is the highest-ROI 4 minutes in the restaurant. The owners we work with describe the same thing: the first week is unfamiliar, the second week becomes automatic, and by week three they cannot imagine running the restaurant without the evening number. Most discover within the first month that one lever — usually the weekday afternoon schedule or the portion drift on a single high-volume dish — is worth several thousand euros a year.

The math is simple, the discipline is everything, and the discipline is what builds restaurants that last. Use the restaurant prime cost calculator to run your numbers without signing up. Or get started with nouz to see prime cost computed automatically at close of day, alongside the rest of your daily P&L — see how the same logic works for a smaller cafe, the labor cost benchmark for the labor half in isolation, the full 2026 cafe benchmarks, the food cost ratio benchmarks by category, the why-is-my-cafe-not-making-money diagnostic for the broader picture, and the 90-day menu engineering method. Other tools that pair with this post: the food cost percentage calculator, the labor cost percentage calculator, and the menu pricing calculator.

The restaurants that stay open through year five and year ten are not the ones with the loudest reviews or the most flattering Instagram. They are the ones whose owners look at prime cost every evening before they lock up. The number itself is not complicated. The discipline of looking at it every day is the entire game.

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