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Customer Retention Calculator

Calculate retention and churn rates, and the value of keeping more customers

This customer retention calculator reveals the true cost of churn and the outsized value of even small retention improvements.

Use the calculator →How it works

Customer retention ratethe formula

  1. 01Customers at startthe base you are keepingSTART
  2. 02New customerstaken out of the count− NEW
  3. 03Customers at endwho is still with youEND
  4. 04Retention rate(end − new) ÷ start× 100

Membership median renewal82%

82%
Membership sector median renewal rate
MGI 2026 ↗
75%
Median first-year renewal rate
MGI 2024 ↗
5–25×
Cost of acquiring a customer vs retaining one
HBR ↗

01/ the calculator

Calculate Your Customer Retention

Enter your customer numbers to see retention rates, churn costs, and improvement opportunities.

Your Numbers

How leaky is your bucket?

The Leak

What churn costs you

£45,000

Revenue lost every year · 150 members · 15% of total

Of this year's £300k member revenue

£116kLost over 3 years if unreplaced
£9.0kSaved per year at 12% churn

Cutting churn by just 3 points keeps £9,000 in the bucket every year — usually far cheaper than acquiring the same revenue from scratch.

At 15% churn you are holding members better than the 18% a typical membership organisation loses in a year — worth protecting.

Plug the leak — let's chat →

Fifteen minutes, and we come to you with a view — not a pitch deck.

All calculations happen in your browser. We don’t store any data. Get help improving your retention →

02/ any recurring business

For subscriptions, clubs and memberships alike.

It works for any recurring-revenue business — subscription products, clubs and membership organisations alike. Enter your numbers above to see your retention and churn rates and what improving them is worth.

For a sector reference point, the membership median renewal rate is 82% (MGI 2026) — and just 75% for first-year members (MGI 2024 Membership Marketing Benchmarking Report).

Measure new and established customers apart. In peer-reviewed subscription data, retention climbs as a cohort ages because the customers most likely to leave leave first (Fader and Hardie, 2007) — one blended rate hides both.

Membership median renewal rate (MGI 2026)

First-year renewal — benchmark new customers separately (MGI 2024)

Marketing General Inc. US surveys of membership organisations — two editions, named separately.

03/ how it works

How the Customer Retention Calculator Works

Why it pays. Acquiring a customer can cost five to 25 times more than retaining one (Harvard Business Review). Retention gains compound into lifetime value and lower acquisition spend.

How much it pays. In a peer-reviewed valuation of five US firms, a 1% improvement in retention raised firm value by about 5%, against 0.1% for the same improvement in acquisition cost (Gupta, Lehmann and Stuart, 2004). The classic case figures: 5% fewer defections lifted profits 85% in one bank’s branches and 30% in an auto-service chain (Reichheld and Sasser, 1990).

01

Customers at the start

Start with 1,000 customers.

1,000at start

04/ retention or inertia

Kept customers, or just uncancelled ones?

A retention rate counts who is still paying — not whether they meant to.

The Department for Business and Trade estimates that around 5.8% of active UK subscriptions are unwanted — about 9.7 million contracts, 3.6 million of them rolled over from a free or discounted trial (DBT, April 2026).

The Digital Markets, Competition and Consumers Act 2024 answers with reminder notices before renewals, straightforward cancellation (online, if the customer signed up online) and a 14-day cooling-off period after a trial or 12-month-plus contract renews. The rules are not yet in force; the government expects them to commence in 2027.

For a consumer subscription business, that changes what the calculator should be fed. Retention that rests on customers forgetting to cancel is likely to show up as churn once every customer is reminded — so the number worth improving is the retention you would keep if they all were.

Unwanted UK subscription contracts (estimates)

  • All unwanted9.7m
  • Rolled over from a trial3.6m
  • Auto-renewed1.3m
Department for Business and Trade, government response on the subscription contracts regime, April 2026 · government estimates citing research, UK consumer subscriptions.

05/ memberships and clubs

Running a Membership or Club?

If your customers are members, use the dedicated membership retention calculator, and see how you compare against a good membership retention rate. Our member retention services can help you close the gap.

The same maths for subscription businesses, clubs, membership organisations

06/ more tools

More Free Calculators

Members

Membership Retention Calculator

The same maths, tuned for membership organisations.

Churn

Churn Cost Calculator

See the revenue impact of churn and what reducing it saves.

Value

Lifetime Value Calculator

Calculate the total value of a customer over their lifetime.

Free customer retention calculator to work out your retention and churn rates.

07/ questions

Customer Retention Calculator FAQs.

Customer retention rate = ((Customers at End − New Customers Acquired) ÷ Customers at Start) × 100. For example, starting with 1,000 customers, gaining 200, and ending with 1,050 gives ((1,050 − 200) ÷ 1,000) × 100 = 85%. Removing new acquisitions is what makes this a true measure of how well you kept your existing customers.

It varies by industry, but for subscription and membership businesses a useful reference point is the membership sector median renewal rate of 82% (MGI 2026), dropping to 75% in the first year (MGI 2024). First-year and first-90-day retention is where most businesses lose customers, so benchmark new customers separately from your established base.

Because acquiring a new customer can cost five to 25 times more than keeping an existing one, according to Harvard Business Review. Small improvements in retention compound: they lift lifetime value, reduce the acquisition spend needed just to stand still, and are usually the fastest route to profitable growth.

Yes. It is completely free with no sign-up required. All calculations happen in your browser, and nothing you enter is stored or sent to us.

15 minutes · video or phone

Ready to improve your retention?

Now you’ve used the customer retention calculator, put the numbers to work. Our specialists help subscription businesses, clubs and membership organisations keep more customers.

  1. 0115 minutes, video or phone
  2. 02Your retention and churn, sized
  3. 03Where customers are leaving
  4. 04A plain next step
Prefer email? hello@membership.quest →

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Ready to Improve Your Retention?

Now you’ve used the customer retention calculator, put the numbers to work. Our specialists help subscription businesses, clubs and membership organisations keep more customers.

Get Retention Help →See all calculators

08/ sources

Every claim, and where it came from

Vendor and US sources are labelled as such.

  1. Marketing General Inc. — 2026 Membership Marketing Benchmarking Report highlights (median renewal 82%)Industry survey, US
  2. Marketing General Inc. — Benchmarking reports (2024: first-year renewal 75%)Industry survey, US
  3. Harvard Business Review — The value of keeping the right customers (5–25×)Practitioner article, US, 2014
  4. Gupta, Lehmann and Stuart — Valuing customers, Journal of Marketing Research 41(1), 2004 (1% retention → ~5% firm value; acquisition cost 0.1%)Peer-reviewed, US firms
  5. Reichheld and Sasser — Zero defections: quality comes to services, Harvard Business Review, 1990 (PubMed abstract)Practitioner-academic article, US
  6. Fader and Hardie — How to project customer retention, Journal of Interactive Marketing, 2007Peer-reviewed, subscription data
  7. legislation.gov.uk — Digital Markets, Competition and Consumers Act 2024, Part 4 Chapter 2: subscription contractsStatute, UK
  8. Department for Business and Trade — Government response: implementation of the new subscription contracts regime, April 2026 (5.8% unwanted; 9.7m; 3.6m; 1.3m)Government, UK