Price increase impact calculator.

How this calculator works (the same math nouz uses)

A price increase is the most powerful profit lever a small shop has, and this calculator shows why. When you raise a price, your costs don't move — so every extra cent of price lands straight on your profit per unit. The tool works out your profit at the new price, the total profit lift, and the one number owners almost never calculate: how much sales volume you could lose and still be no worse off than before. That last figure turns "will I scare customers away?" from a fear into a measurable margin of safety.

Profit per unit = price − cost
Profit lift = (new profit per unit − old profit per unit) × units
Max volume drop % = (new profit per unit − old profit per unit) ÷ new profit per unit

A worked example

Using the defaults — €4.20 price, €1.10 cost, 1,800 units a month, +10% — the current profit per unit is 4.20 − 1.10 = €3.10, so monthly profit is 3.10 × 1,800 = €5,580. Raise the price 10% and it becomes €4.62; profit per unit jumps to 4.62 − 1.10 = €3.52, and at the same volume monthly profit is 3.52 × 1,800 = €6,336. That's a €756 lift — about a 13.5% gain in profit from a 10% price rise. Now the safety margin: at €3.52 per unit you'd only need 5,580 ÷ 3.52 ≈ 1,585 units to match the old profit. That means you could sell up to ~11.9% fewer units and still not be worse off. A price rise buys you room to lose some volume — the opposite of a discount.

What a healthy number looks like

As a rule of thumb, if your maximum tolerable volume drop is comfortably larger than the drop you realistically expect, the increase is safe. Real-world volume loss from a modest price rise on an everyday item is usually in the 3–5% range for loyal, convenience-driven customers — well inside the ~12% headroom above. The thinner your margin, the bigger the profit lift a price rise delivers, because the increase is a larger share of your per-unit profit. Treat these as guides, not guarantees: elasticity varies by product and location, which is exactly why you test before you commit.

Common mistakes

• Assuming a 10% price rise is only a 10% profit gain. Because costs stay flat, the profit lift is almost always larger — here it's 13.5%.
• Rounding prices down "to be safe." Dropping €4.62 back to €4.50 quietly gives away a big slice of the lift you just calculated.
• Raising every price at once with no test. Change one product for two weeks, measure real units, then roll out what works.
• Confusing volume tolerance with a volume target. The ~12% is the drop you can absorb, not a loss you should expect or aim for.

When to use it — and what's next

Reach for this before any menu reprint, price-list update, or supplier cost pass-through. The math nearly always favours the increase — what owners usually lose is nerve, not customers. To prove it on your own shop, raise one price, then watch the daily numbers in a daily profit and loss template so you catch any real volume change within days instead of guessing. Then run the mirror image with the discount impact calculator to see how much harder a markdown makes you work. Nouz surfaces the effect on profit the same day, so a price change becomes a decision you can verify, not a leap of faith.