Free calculator
What a higher price adds to one unit's contribution, with VAT and the payment fee rescaled on the new gross, and the share of today's volume you could lose before the increase stops paying.
Volume you could lose before it stops paying
20,8%
Sticker increase
€4,90
what the customer sees
25Contribution gained
€4,02
per unit; VAT and fee take their share
25Contribution after
€19,37
was €15,35
The shelf price. VAT is stripped before any contribution is computed, because it was never your money.
What one order adds
The parcel and the payment fee exist because the sale happened, and both belong in the before-and-after: the fee even moves with the price.
↑ ↓ to nudge, Shift for ten. Commas or dots both work.
The tolerance line is arithmetic, not a prediction: whether customers actually leave is an experiment. Raise in steps, watch orders against the line above, and the increase pays for itself long before the line is reached.
The increase adds €4,02 of contribution to every unit, so total contribution holds even if up to 20,8% of today's orders never come back.
An estimate from flat rates. In nouz every order is priced from the costs of its own day.
A price increase calculator shows what a higher price does to one unit's contribution and how much volume the store could lose before the increase stops paying. VAT and payment fees are rescaled on the new gross, and the tolerance line is computed on contribution, never on revenue.
The formula
Price increases enjoy the exact leverage that makes discounts so expensive, pointed the other way. The goods, the parcel and the fixed leg of the payment fee do not rise with the price, so almost every net cent of an increase flows straight through to contribution.
When roughly a third of the net price survives the variable costs, ten percent on the price is about a quarter on the contribution, and the tolerance for lost volume is correspondingly wide: the month keeps its total contribution even if a fifth of today’s orders never come back.
Whether they come back is not arithmetic, it is your customers, and the honest use of this page is as a benchmark for that experiment: raise in steps, watch orders against the tolerance line, and reverse early if reality disagrees.
Where it goes wrong
Underpricing is the commonest quiet leak in small stores, and it survives on exactly these four habits.
“We would lose customers” is a feeling until the tolerance line prices it. If the month holds level at a fifth of volume lost, the fear has to argue that more than a fifth would actually leave, and for most modest increases on differentiated products, it will not.
A store bleeding through returns, a mispriced parcel or an ad budget below its break-even ratio will not be cured by a price rise, and may spend real customer goodwill failing to cure it. Price answers a margin question; make sure the margin is the question first.
Products differ in how exposed they are: a unique product with strong reviews tolerates far more than a commodity the next tab sells identically. Raise product by product, starting where comparison is hardest, and let each one find its own line.
The sticker rises gross, and the tax authority and the gateway are both standing at the till: the VAT inside the extra euros was never yours and the fee percentage rides the new gross. The gain that reaches contribution is real and large, but it is the net figure, and planning with the sticker figure overpromises every increase.
Worked example
The calculator’s own defaults: a product on the shelf at €49,00 including 19% VAT, bought in for €18,50, shipped for €6,40 all-in, paid through a gateway taking 1,9% of the gross. Before the change it contributes €15,35 per unit.
The increase moves the sticker to €53,90. The net price rises to €45,29, the fee grows to €1,02, and the contribution lands at €19,37.
A €4,90 sticker increase put €4,02 into contribution: a 26% gain in what the unit keeps, from a 10% change in what it charges. Total contribution now holds even if about 20,8% of today’s orders disappear, which is the line the volume experiment is measured against.
The mirror image of this walk, what a code takes out through the same leverage, is the discount impact calculator below.
In the app
A calculator works from flat rates you type once. nouz prices every single order from the cost rules that were in force on that order's own date, and rebuilds the same statement every night from your own orders and your own ad spend.
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The long version
Want the long version rather than the arithmetic?
A 10% rise20,8%volume you could lose and hold level9 min readThe price rise playbook: how much volume you can afford to loseAlmost every cent of an increase reaches contribution. The tolerance line, how to stage a rise, and what to watch in the four weeks after it lands.The price rise playbooknouz prices every order by the rules effective on its own date, so a price change shows up as exactly what it was: this contribution before, that contribution after, day by day.