How many stamps should a loyalty card have? The math behind the right count.
May 26, 2026 · Antoine Pedretti · 6 min read
Loyalty card rewards are what a customer earns by collecting stamps, points, or completed visits on a loyalty card. The reward might be a free coffee after ten visits, a free haircut after six bookings, ten percent off after a hundred euros spent. The mechanic is the same across categories. What changes is the count — how many stamps, points, or completed actions unlock the reward — and the math that makes the count work.
This article is the math behind that number. How many stamps should a loyalty card actually have, why the number matters more than most shops realize, and what works per shop type.
We make Stampo, a digital loyalty card SaaS, so we look at this question across thousands of merchant configurations. We have a bias toward stamp-based programs (it's what we do). We'll name where stamp-based isn't the right shape.
What loyalty card rewards actually are
A loyalty card reward is the thing the customer earns when they hit the target number of stamps (or points, or visits). Three things determine whether the reward design works:
- The count — how many stamps to redeem. 5, 8, 10, 12 are the common choices.
- The reward itself — what the customer gets. A free item, a discount, an upgrade, an exclusive perk.
- The cost to the merchant — what redemption actually costs in cash terms.
Most articles treat these separately. They're not separate. The count, the reward, and the cost interact. Get any of the three wrong and the program either fails (customers never reach redemption) or fails differently (customers redeem so often the margin disappears).
The math of stamp count
The stamp count is determined by three numbers about your shop:
- Visit frequency of a typical repeat customer (visits per month)
- Average ticket size
- Reward cost to your shop (the marginal cost of giving the reward, not the menu price)
Two rules emerge from the math:
Rule 1: The card should complete in 2 to 5 months for a repeat customer
Less than 2 months means the customer redeems too often and your margin erodes. More than 5 months means the customer loses the card or loses interest before redemption — and you get no compounding benefit because they never felt the reward.
If a customer visits 4 times a month (weekly), a 10-stamp card completes in 2.5 months. Right band.
If a customer visits 2 times a month (biweekly), a 10-stamp card completes in 5 months. Edge of the band — fine, but consider 8 stamps.
If a customer visits 1 time a month, a 10-stamp card completes in 10 months. Too long. Drop to 5 stamps.
Rule 2: The reward cost should be 8% to 15% of the customer's spend on the card cycle
This is the band where rewarded customers feel the reward as meaningful and the math still works for the merchant.
Below 5%: the customer doesn't feel it. Loyalty design fails.
Above 20%: the merchant is giving back too much. Either the reward feels lavish in a way that feels off-brand, or the program becomes a real margin drag.
The 8-15% band is where the customer feels rewarded and the merchant comes out ahead through the visit-frequency uplift.
Worked example: how to pick a stamp count
Take a café with €4.50 average ticket and visits of 2 times a week (weekly regulars). The customer visits 8 times a month.
- 10-stamp card completes in ~5 weeks (about 1.25 months at this cadence — too fast). Reward feels too easy.
- 12-stamp card completes in ~6 weeks. Better.
- 15-stamp card completes in ~8 weeks (2 months). Right band.
If the reward is a free coffee (€2 marginal cost to the café, €4.50 menu price), the customer spent €4.50 × 14 = €63 to earn a €2 reward. That's ~3% reward cost. Too low — the customer won't feel it.
Either drop the count to 10 stamps (€2 reward / €45 spend = 4.4%, still low) and make the reward bigger, or keep the count and pair it with a higher-value reward (free coffee + pastry = €6 marginal cost = 9.5% — right band).
The pattern: count and reward have to be tuned together.
5 vs 8 vs 10 vs 12 — what each count implies
| Count | Best for | Visit cadence implied | Reward feel |
|---|---|---|---|
| 5 stamps | Full-service restaurants, wine shops, bookshops | Monthly visits | "I'm halfway there after 2 dinners" — short, motivating |
| 6 stamps | Hair salons, barbers, beauty studios | 4-12 visits/year | Matches the typical regular's annual booking pattern |
| 8 stamps | Brunch restaurants, casual bistros | Weekly-to-biweekly | Sweet spot for "see your regulars but not daily" shops |
| 10 stamps | Cafés, bakeries | 2-3 times a week | The classic. Tested over 50 years of paper loyalty cards. |
| 12 stamps | Cafés with daily-coffee regulars | Daily | When the customer comes in 5+ times a week, 10 feels too short |
A common mistake: defaulting to 10 because "everyone uses 10". Cafés use 10 because cafés have the visit cadence that makes 10 the right number. A restaurant copying that default ends up with a card that never completes.
Reward design beyond stamp count
Counting stamps right is half the job. The other half is the reward itself. Three reward shapes work, each with different tradeoffs:
Shape 1: Free item
A free coffee, a free dessert, a free pastry. The simplest and most-tested reward shape.
- Why it works: the customer pictures the reward immediately. Free coffee. Free croissant. Concrete.
- Cost discipline: marginal cost only (the cup of coffee, not the menu price). Stays in the 8-15% band easily.
- Where it breaks: when the free item feels arbitrary. A free side dish at a steakhouse where the customer wanted a different free thing.
Shape 2: Discount on next visit
10% off the next visit. €5 off your next purchase.
- Why it works: it's flexible. The customer applies the reward however they want.
- Where it breaks: percentage discounts smaller than 10% feel imperceptible. Fixed-amount discounts (€5 off) work better than percentages because the customer can compute the value instantly.
- Cost discipline: percentages can blow past the 15% band quickly. Be careful.
Shape 3: Upgrade or perk
A free upgrade (size up the coffee, an extra topping). An access perk (priority booking, early-access menu, free corkage).
- Why it works: non-monetary perks cost the shop very little but feel disproportionate to the customer.
- Best for: restaurants with high ticket sizes where a free upgrade feels real, and shops with constrained capacity where access perks are genuinely scarce.
- Where it breaks: when the upgrade isn't visible enough that the customer realizes they got it.
Per-vertical recommendations
| Shop type | Stamp count | Reward type | Reward cost target |
|---|---|---|---|
| Café (weekly regulars) | 10 stamps | Free coffee or free coffee + pastry | 8-12% of cycle spend |
| Café (daily regulars) | 12 stamps | Free large coffee + pastry | 8-12% |
| Bakery | 8 stamps | Free pastry or bread | 8-12% |
| Full-service restaurant (monthly cadence) | 5 stamps | Free shared starter + dessert OR free glass of wine | 12-15% |
| Casual bistro (weekly cadence) | 8 stamps | Free dessert or free side | 10-12% |
| Hair salon, barber | 6 stamps | Free cut on the 6th booking | 10-15% |
| Beauty studio, spa | 4-6 stamps | Free service add-on (face mask, conditioner treatment) | 12-15% |
| Wine shop | 5 stamps | Free bottle in a sub-€20 tier | 10-12% |
| Bookshop | 5 stamps | Free book voucher (€15) | 10-15% |
| Boutique retailer | 5 stamps OR points | Variable — depends on basket size pattern | 8-12% |
For café-specific reward design, see best loyalty card rewards for cafés. For salons and barbers, see loyalty card reward ideas for hair salons.
When stamp count is the wrong question
Some shops shouldn't run stamp-based programs at all. The signals:
- Visit frequency is below monthly. A wine shop where regulars come twice a year, an event-driven boutique, a special-occasion venue. Stamp cards die unredeemed. Use a referral program or a tier program instead.
- Ticket size varies wildly. A general retailer where one customer spends €5 and another spends €500 on the same trip. Stamps under-reward the high-spender. Use a points-based program tied to your POS.
- Customers buy big-ticket items rarely. Furniture, jewelry, art. A loyalty card metaphor doesn't fit. Use a CRM-driven referral or a paid VIP membership.
- Your differentiator is the experience, not the throughput. A chef-led restaurant with a tasting menu — reward design here is about access (early reservations, chef's amuse-bouche), not stamp counts.
The default for everyone else is stamp-based, and the count comes from the math above.
TL;DR
The right stamp count for a loyalty card is the one that lets a typical repeat customer complete the card in 2-5 months at their current visit cadence. For most cafés that's 10. For full-service restaurants that's 5. For hair salons that's 6. For higher-frequency cafés it's 12.
The reward cost should sit in the 8-15% of cycle spend band. Below 5% the customer doesn't feel it; above 20% the merchant gives back too much.
Stamp count and reward have to be tuned together. A 10-stamp card with a €2 reward at a €4.50 average ticket gives back 3% — too low, and the program will underperform. Same card with a €6 reward (coffee + pastry) gives back 9% — works.
FAQ
What is the best loyalty program?
There's no single best, but the best loyalty program for a given shop matches three things: the visit frequency of your regulars, the average ticket size, and the marginal cost of the reward. The right stamp count and reward fall out of that math. See the loyalty programs 2026 guide for the broader framework.
What are loyalty reward points?
Loyalty reward points are a unit of value that customers accumulate proportionally to their spending — every euro spent earns a fixed number of points. Points are then redeemed against rewards at thresholds (e.g. 500 points for €5 off) or from a catalog. Points-based programs are different from stamp-based programs (where each visit, not each euro, earns the unit). Points typically require a connected point-of-sale system to track spend automatically.
What are the best loyalty cards to have?
For a customer, the most useful loyalty cards are the ones from shops they actually visit weekly or monthly. Volume of cards matters less than the visit frequency of the issuing shop. For a small business, the best loyalty card to issue is one that lives in the customer's wallet pass (Apple Wallet or Google Wallet) so it cannot be lost.
What are the benefits of a loyalty card for the business?
Three measurable benefits: higher visit frequency from existing customers (the retention compounding effect quantified by Bain), the ability to identify your regulars and re-engage lapsed ones (paper cards can't do this — wallet passes can), and a 20% lift on first-time purchase conversion when activated at the till. For the math, see is a digital loyalty card worth it.
What is the most popular loyalty program?
By recognized brand: Starbucks Rewards, Amazon Prime, and major airline mileage programs. By format adopted at small-business scale: stamp-based wallet-pass loyalty cards, which have replaced paper punch cards as the dominant pattern for in-store SMB loyalty programs in 2026.
Which loyalty program is the best for a small business?
A stamp-based wallet-pass loyalty card with a stamp count matched to your visit cadence (5-12 depending on shop type) and a reward in the 8-15% cost band. Cheapest published tool in this category in May 2026 is Stampo at €9/month. The 2026 cost comparison walks through 10 alternatives.
How many stamps should a coffee shop loyalty card have?
10 stamps for weekly regulars, 12 stamps for daily regulars. The classic 10-stamp café card has 50 years of evidence behind it. The reward should be a free coffee (or free coffee + pastry) sized to the customer's typical order — that lands the reward cost in the 8-12% band.
To test what a properly-tuned stamp card looks like for your shop, start a 14-day Stampo trial. The card configurator lets you change the stamp count and preview the math on your shop's actual numbers.
Verified against industry standard loyalty research (Bain, HBR) and current SaaS competitor offerings in May 2026. Updated quarterly.