Stamp Card: How Many Stamps Until Reward?
Every week without a working stamp card, you lose regular customers without noticing — yet the right number is found in 5 minutes.
Between 5 and 10 stamps — that's the answer for most shops. The exact number depends on how often a typical customer visits you. The card should be full after four to eight weeks with frequent visits, or at most after half a year with rare appointments. Why that's the case and how to find the right number for your industry, you'll learn here with concrete sample calculations.
The Rule of Thumb: Visit Frequency Times Time Window
The stamp count comes down to two questions:
- How often does a good regular customer come? Not your best customer, but a normal, loyal one.
- In what timeframe should they be rewarded? With frequent visits about four to eight weeks, with rare visits up to six months.
Multiply visits per week by the weeks in your time window. A café customer with two visits per week and a five-week window lands at 10 stamps. A barber customer with one visit every five weeks and a six-month window lands at 5.
Why the time window matters: A reward that lies in the distant future doesn't motivate. The customer needs to see the goal, or they won't start at all. More on this in The Psychology of Loyalty Programs.
Take the Self-Test: Does Your Stamp Count Work?
Answer these questions with yes or no:
- Does it take longer than 6 months for a normal regular customer to fill the card?
- Do more than half your customers have a started card they never complete?
- Does the reward cost you more than 10% of the revenue the customer generates for those full stamps?
- Did you choose the stamp count because you liked it, without calculating the visit rhythm?
One yes? Your stamp count probably doesn't fit. Keep reading to find the right one.
Recommended Stamp Counts by Industry
The following table shows typical values. They are starting points, not rules. Your numbers may vary depending on price level and customer base.
| Industry | Visit Frequency | Recommended Stamps | Card Full After About | Typical Reward |
|---|---|---|---|---|
| Café, Coffee Bar | 2 to 4 times per week | 10 | 4 to 5 weeks | One free coffee |
| Bakery | 2 to 3 times per week | 8 | 3 to 4 weeks | One free pastry |
| Snack Bar, Kebab | 1 to 2 times per week | 8 | 6 to 8 weeks | One free meal |
| Lunch Counter | 2 to 3 times per week | 10 | 4 weeks | One free lunch |
| Barber, Barbershop | every 4 to 6 weeks | 5 | 6 months | Discount or add-on service |
| Nail Studio | every 3 to 4 weeks | 6 | 5 months | One discounted treatment |
| Beauty Studio | every 4 weeks | 5 to 6 | 5 to 6 months | Add-on treatment |
| Car Wash | every 2 to 3 weeks | 8 to 10 | 5 months | One free wash |
| Boutique, Retail | Irregular | 5 to 6 | Half a year | Voucher |
| Ice Cream Shop (Seasonal) | 1 to 2 times per week | 6 to 8 | 5 to 6 weeks | One scoop or cup |
With stampa, the 143 industry templates already come with fitting values. You can adopt them when creating the card or adjust them.
Sample Calculations: Stamp Count and Reward Together
The stamp count can't be viewed separately from the reward. Both together determine what the customer gets and what it costs you.
Café: 10 stamps, one free cappuccino. Ten coffees at €3.50 are €35 in revenue. The free coffee costs about €0.80 in ingredients. The customer gets a noticeable value, you give away a small portion of the revenue they generated.
Barber: 5 stamps, €10 discount. Five haircuts at €28 are €140. The discount is €10. One fewer stamp, so 4, would fill the card after five months — too generous for a €10 discount. One more stamp, so 6, stretches it over seven months, which is at the limit for a men's barber.
Boutique: 5 stamps from €30 purchase, €15 voucher. At least €150 in revenue, €15 reward. The minimum purchase per stamp prevents a sock purchase from earning a stamp.
Bakery: 8 stamps, one free croissant. Eight purchases at an average of €4 are €32. The croissant costs well under €1 in ingredients. The card is full after three to four weeks, which fits a bakery's rhythm.
Which type of reward works best for which industry is compared in Choosing the Right Reward for Your Loyalty Program.
Common Mistakes with Stamp Counts
Most stamp cards fail not because of the idea, but because of the number. These are the mistakes you see most often:
Too many stamps. 15 or 20 stamps for a coffee. The reward is so far away that the customer doesn't take the card seriously. Fewer stamps with a smaller reward work better than many stamps with a big one.
Too few stamps. 3 stamps for a free coffee sounds generous, but costs you the ingredient price every fourth coffee. The customer hasn't really committed to you.
Stamp count without looking at rhythm. 10 stamps at a beauty studio means almost a year. Hardly anyone experiences that to the end.
Conditions that stretch the count. "One stamp per day, only from €5, not in combination with promotions." Every condition makes the card feel longer.
Never adjusting. The first number is an assumption. Without review, it stays forever, even if it doesn't work.
How It Looks in Practice
A café in Cologne started with 12 stamps for a free coffee. After three months, only 8% of cards were full. The owner switched to 10 stamps. Within six weeks, the completion rate rose to 24%, and customers came more often. The change cost nothing because the digital card was adjusted in the dashboard.
The Starting Stamp: Worth It or Not?
A well-known effect from behavioral research (also called the Endowed Progress Effect): People who see they've already started are more likely to continue than those starting from zero. Some shops give a free stamp when creating the card.
This can work, but there's a trap: if you want 10 stamps and give one away, you really have a 9-stamp card. So count the starting stamp in your total. An 11-stamp card with a starting stamp equals a 10-stamp card without one.
With stampa, the card starts at zero by default, so every stamp counts for a real visit and your analytics stay clean.
How to Find and Test the Right Number
The simplest way has three steps:
1. Start with the rule of thumb. Visit frequency times time window, rounded to a clean number. When in doubt, go with the smaller one.
2. Run it for four to eight weeks. With a digital stamp card, you see in the dashboard how many cards are active, how many customers return, and how many rewards are redeemed.
3. Adjust. If few cards are completed, the number is too high. If they fill very quickly and customers don't come more often, the number is too low or the reward isn't the right incentive.
With a paper card, you have no numbers for step 2. With a wallet card, you can change the stamp count in the dashboard, existing cards are adjusted fairly, and you see after a few weeks whether the new number works better.
How to set up the entire program step by step is in Creating a Loyalty Program for Small Shops.
What Happens If You Don't Change Anything
A stamp card with the wrong number is worse than no card. The customer starts collecting, realizes after a few weeks that the reward is unreachable, and feels disappointed. They throw the card away and come less often. You've invested time and money and achieved the opposite.
Without a stamp card, you lose regular customers to shops that have one. With a bad stamp card, you lose them faster.
Conclusion
How many stamps until the reward? As many as a normal regular customer collects in four to eight weeks, or at most in half a year for rare appointments. For most shops, that's 5 to 10 stamps, combined with a reward that means something to the customer and costs you only the ingredient price.
The first number is an assumption you should test. With stampa, you see in the dashboard whether it works and can adjust it anytime. Start free — up to 100 active cards, no credit card, set up in 5 minutes.