Calculator

What does a stamp card bring in?

Enter your own numbers. You will see how many extra visits a month carry the card and what is left at the end. The formula and every assumption are below.

All pre-filled values are examples from our café calculation, not benchmarks. Overwrite them with your own numbers.

The calculator needs JavaScript for your own numbers. You can still read the example, the formula and the assumptions, and work through them with your figures.

Your shop

Visits per week

Paid visits in a normal week. Your number of receipts is a good guide.

Revenue per visit in €, net

Your average receipt, excluding VAT.

Margin in %

What you keep from each euro of revenue after cost of goods and other variable costs.

Your card

Stamps to the reward

A whole number: after this many stamps, the guest gets the reward.

Cost of one reward in €, net

The reward’s cost of goods. If it replaces a paid purchase, add the lost contribution.

Other costs per month in €, net

For example extra working time, if you want to count it.

Plan

Monthly price including VAT, as on the pricing page. Your first annual subscription also includes a one-time display stand bundle; this calculator uses the monthly price.

Your guests

Share of visits with a card in %

How many in 100 visits get a stamp? Regulars weigh more here because they come more often.

Visits per cardholder per month

How often does a guest with a card come, even without the card? Three times a week is 13 a month.

Extra visits per cardholder per month

Your assumption about what the card does. Visits you would otherwise have lost count too. We know of no value that holds in general.

Result per month

Example calculation

Effect per month +€7.92

With these numbers, you keep about €7.92 a month. The card needs 17 extra visits; the assumption is 20.

The calculator estimates cardholders in one month, not your total pass count. Free allows up to 20 issued customer passes in total. Old and test passes still count until deleted in Treubar. Removing them from a wallet is not enough. Free may already be full even without a warning and with fewer estimated monthly cardholders. How customer passes count towards the Free limit.

Break-even: extra visits needed: 17
That is, per cardholder per month: 0.42
Or this many new regulars: 2

From this many extra visits a month, the card carries itself.

How the effect adds up

Contribution from extra visits: €51.01
Rewards: − €35.10
Plan: − €7.99
Other costs: − €0.00
Effect: +€7.92

One reward costs you 2% of the revenue up to that point.

How we calculate

No hidden factors: this is the whole calculation, with the example values from above. Our article walks through the same reasoning step by step.

The formula, step by step

Stamps per month Visits per week × 52 ÷ 12 × share with a card Example: 300 × 52 ÷ 12 × 40% = 520
Estimated cardholders in one month Stamps per month ÷ visits per cardholder Example: 520 ÷ 13 = 40
Extra visits Cardholders × extra visits per cardholder Example: 40 × 0.5 = 20
Contribution per visit Revenue per visit × margin Example: €3.20 × 79.7% = €2.55
Rewards per month (Stamps per month + extra visits) ÷ stamps to the reward Example: (520 + 20) ÷ 10 = 54
Programme costs Rewards × cost of one reward + plan + other costs Example: 54 × €0.65 + €7.99 + €0.00 = €43.09
Effect per month Extra visits × contribution per visit − programme costs Example: €51.01 − €43.09 = +€7.92
Break-even (Reward costs without extra visits + plan + other costs) ÷ (contribution per visit − cost of one reward ÷ stamps to the reward), rounded up Example: (€33.80 + €7.99) ÷ €2.49 = 16.8, so 17 visits
New regulars instead of extra visits Break-even ÷ visits per cardholder, rounded up Example: 16.8 ÷ 13, so 2

What we assume

Your revenue and costs are net. The plan price is the monthly price including VAT; you pay less on the yearly plan, and if you reclaim input VAT your real cost is below the displayed price.
Every value entered comes from you or is our example. We do not insert any industry figure.
A month has 52 ÷ 12 weeks. We do not adjust for seasons or holidays.
Each visit with a card earns exactly one stamp. Starter and double stamps are not included.
Every stamp is eventually redeemed. This is deliberately cautious: cards that never fill up cost you less.
Extra visits collect stamps too. That is why rewards come out slightly higher than without extra visits.
The reward replaces no paid purchase. If it does, add the lost contribution to the cost of one reward.
An extra visit brings the same revenue and margin as any other visit.
We estimate cardholders in one month. This is not the number of all issued customer passes still stored in Treubar.

What the calculator does not know

Your total pass count and remaining capacity on Free. Previous guests and test passes still count until their passes are deleted in Treubar, even if the monthly estimate is below the limit.
Whether the extra visits will really happen. That stays your assumption. The calculator only shows how many you need; it is not a forecast.
Guests who merely move a purchase: those visits are not extra and should not go into your assumption.
The start-up period. The calculation shows a settled month, not the first weeks while cards are still filling up.
One-off costs such as an optional NFC stand or printing, as well as taxes and your working time, unless you enter them as other costs.
What you cannot measure in euros per visit: recommendations, reviews or the effect of push campaigns.

For more on the calculation, how cafés, bakeries and salons differ, and how to check after three months whether the card works, read our article Is a stamp card worth it?

Test the numbers in your own shop

Real redemptions tell you more than any assumption. With Free, you can set up your card at no cost and try the routine with your first guests.

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