Affiliate Marketing Math: EPC, CPA, RevShare & LTV Formulas

Eight formulas govern affiliate program economics: EPC, conversion rate, CPA breakeven, RevShare net present value, effective commission rate, LTV:CAC, negative carryover exposure, and hybrid deal valuation. This reference page defines each formula exactly, walks through a worked example with real numbers, and gives a verdict on when to use it. The formulas apply across iGaming, Forex, prop trading, SaaS, and e-commerce affiliate programs; the worked examples use commission and lifetime-value ranges typical of performance marketing programs tracked on the Track360 platform.

• EPC (earnings per click) = total commission earned / total clicks; networks often quote EPC per 100 clicks
• Conversion rate = conversions / clicks x 100; the click-to-deposit chain multiplies CTR, signup rate, and deposit rate
• CPA breakeven = customer LTV x contribution margin; never pay a CPA above this ceiling
• Payback period = CPA / average monthly net revenue per customer
• RevShare NPV = sum of (monthly NGR share / (1 + discount rate)^month) over the retention window
• Effective commission rate = total affiliate payout / total NGR generated, the single truest cost metric
• LTV:CAC ratio of 3:1 is the standard health threshold; below 2:1 the channel is overpaying
• Negative carryover caps affiliate downside at zero per period but shifts variance risk to the operator when disabled
• Hybrid deal value = CPA component + (reduced RevShare % x expected LTV share), typically 40-60% of full RevShare
• A $200-LTV customer favors CPA deals; an $800+ LTV customer favors RevShare in almost every modeled scenario
• Break-even RevShare % vs a given CPA = CPA / expected lifetime NGR per referred customer
• All 8 formulas require attribution-clean data: S2S postback tracking removes the 18-23% conversion loss seen with cookie-only tracking

Affiliate Marketing Formula Quick Reference

Eight formulas fit in one reference table: four measure traffic efficiency (EPC, conversion rate, effective commission rate, LTV:CAC) and four price commission deals (CPA breakeven, RevShare NPV, negative carryover exposure, hybrid valuation). Bookmark this table; every section below expands one row with a worked example and a verdict.

EPC Formula: Earnings Per Click

EPC (earnings per click) equals total commission earned divided by total clicks sent, so an affiliate earning $4,200 in commission from 1,400 clicks runs a $3.00 EPC. Many affiliate networks quote EPC per 100 clicks instead: the same performance reads as a $300 EPC on network dashboards. Always confirm which convention a program uses before comparing offers; a 100x definitional gap is the most common error in affiliate media buying spreadsheets.

Worked example: an iGaming affiliate sends 8,000 clicks in a month, produces 96 first-time depositors, and earns $11,520 in CPA commission at $120 per depositor. EPC = 11,520 / 8,000 = $1.44. If the same traffic ran on a 30% RevShare deal and the cohort generated $30,000 NGR in month one, month-one EPC would be 9,000 / 8,000 = $1.13, with additional EPC accruing every future month the cohort stays active.

Conversion Rate and the Click-to-Deposit Chain

Conversion rate equals conversions divided by clicks times 100, and affiliate funnels chain 3 conversion rates together: click-to-signup (typically 8-20%), signup-to-deposit (typically 25-45%), and deposit-to-qualified-action where qualification rules apply. A funnel with a 12% signup rate and a 35% deposit rate converts 4.2% of clicks into depositors: 1,000 clicks yield 120 signups and 42 first-time deposits.

The chain matters because each stage is owned by a different party. The affiliate controls click quality and pre-sell, the operator controls registration UX and deposit conversion, and the program's qualification rules (minimum deposit, wagering activity, KYC completion) determine how many deposits become commissionable actions. When an affiliate's EPC drops, decomposing the chain shows whether traffic quality fell or the operator's funnel degraded; accurate decomposition requires postback-level tracking of each stage rather than last-click totals.

CPA Breakeven: The Maximum You Can Pay

CPA breakeven equals customer lifetime value multiplied by contribution margin: a player worth $400 in lifetime NGR at a 60% contribution margin supports a maximum CPA of $240, and every dollar paid above that is negative unit economics. Contribution margin here means NGR minus variable costs: payment processing, platform fees, bonus cost, and gaming taxes. Operators commonly pay 40-60% of breakeven as the actual CPA, reserving the remainder as profit and as buffer against LTV estimation error.

Worked example: a Forex broker's referred trader deposits $800, generates $520 average lifetime spread revenue, and carries $130 of variable cost, leaving $390 contribution. Breakeven CPA is $390. The broker offers affiliates a $200 CPA, a 51% share of contribution, and pairs it with a 3-month payback target: at $65 average monthly contribution per trader, the $200 CPA pays back in 3.1 months. Payback period = CPA / monthly contribution, and programs holding payback under 4 months rarely face cash-flow stress even when volume doubles.

RevShare NPV vs CPA: Which Pays More

RevShare NPV equals the sum of each month's expected commission divided by (1 + monthly discount rate) raised to the month number, summed across the retention window; for a median iGaming cohort a 30% RevShare deal overtakes a $120 CPA at month 9-14. The discount rate reflects the affiliate's cost of capital and cohort risk; 1-2% monthly (12-27% annualized) is a reasonable band for iGaming and Forex cohorts.

Worked example: 100 referred players produce $4,000 cohort NGR in month 1, decaying 12% per month. A 30% RevShare pays $1,200 in month 1, $1,056 in month 2, and so on. Discounted at 1.5% monthly, the 24-month NPV is approximately $7,900, or $79 per player. A $120 CPA on the same 100 players pays $12,000 immediately. Here CPA wins because the cohort decays fast; slow the decay to 6% monthly and RevShare NPV rises to roughly $14,600 and wins by 22%. The crossover is entirely a function of retention, which is why RevShare favors operators and affiliates with high-retention products and why the break-even RevShare percentage against any CPA equals CPA / expected lifetime NGR per referred customer.

Effective Commission Rate: The Truest Cost Metric

Effective commission rate (ECR) equals total affiliate payout divided by total NGR generated by affiliate-referred customers, and healthy programs run 15-35% ECR depending on vertical. ECR is the only metric that makes CPA, RevShare, and hybrid spend comparable on one line: a program paying $84,000 across all models against $280,000 of referred NGR runs a 30% ECR regardless of deal mix.

ECR exposes deal-mix drift that per-deal reporting hides. A program that shifts from RevShare to aggressive CPA during a growth push may see ECR spike to 50%+ against early cohort NGR, then normalize as cohorts mature. Finance teams should track ECR on both a cash basis (payouts this period / NGR this period) and a cohort basis (total payout for a cohort / total NGR from that cohort). The cohort basis is the honest one; the cash basis is the one that shows up in monthly P&L reviews, and the gap between them equals the program's embedded CPA prepayment.

LTV:CAC for Affiliate Channels

LTV:CAC equals customer lifetime value divided by fully loaded acquisition cost, and the 3:1 health threshold means a $450 LTV supports at most a $150 fully loaded CAC: below 2:1 the channel is overpaying, above 5:1 the program is underinvesting in growth. For affiliate channels, CAC must be fully loaded: commission plus platform fees, affiliate team salaries allocated per acquisition, fraud losses, and payment costs. A $120 CPA commission typically becomes a $150-170 fully loaded CAC.

Worked example: an operator acquires 500 depositors monthly via affiliates at $130 average commission. Team, platform, and fraud overhead add $18,000 monthly, so fully loaded CAC = (65,000 + 18,000) / 500 = $166. At $450 average LTV, the ratio is 2.7:1, marginally under target. The operator's options, in order of leverage: improve retention (raises LTV directly), tighten qualification rules to filter low-intent depositors, renegotiate top-heavy deals, or rebalance traffic toward geos with higher LTV. Cutting commission across the board is usually the worst lever because it pushes super-affiliate volume to competitors first.

Negative Carryover Math

Negative carryover determines whether a RevShare affiliate's negative month (caused by a big player win) offsets future commission: with carryover enabled, a -$3,000 month must be earned back before new commission accrues; with carryover disabled, the balance resets to $0 and the operator absorbs the loss. The formula for the affiliate's expected annual cost of carryover is the probability of a negative month times the average negative depth times months to recover.

Worked example: an affiliate's cohort produces $2,500 average monthly NGR share with a 10% chance each month of a -$3,000 result from a large win. With no negative carryover, expected annual commission is approximately 12 x (0.9 x 2,500) = $27,000, because negative months simply zero out. With carryover enabled, each negative event also consumes roughly 1.2 subsequent months of earnings, cutting expected annual commission to about $23,400, a 13% haircut. Operators price this: no-carryover deals typically carry a 5-10 point lower RevShare percentage, which is the explicit premium for the operator holding variance risk. Regulated-market operators must also document the chosen treatment in affiliate agreements; MGA licensees are required to specify the NGR calculation method in the contract itself.

Hybrid Deal Valuation

A hybrid deal's value equals the CPA component plus the discounted RevShare component, and market-priced hybrids set each component at 40-60% of its standalone value: a program offering $120 CPA or 35% RevShare standalone will typically offer $60 CPA + 17.5% RevShare as the hybrid. The affiliate should value the hybrid as: (hybrid CPA x conversions) + (hybrid RevShare % x expected discounted lifetime NGR), then compare against both standalone options.

Worked example: using the median cohort from the RevShare section (100 players, $30,500 lifetime NGR, NPV factor bringing 17.5% RevShare to roughly $4,600), a $60 CPA + 17.5% RevShare hybrid is worth 6,000 + 4,600 = $10,600. That sits between the $12,000 standalone CPA and the $7,900 standalone 30% RevShare, as expected for a median cohort. Hybrids win when the affiliate needs cash flow but believes retention will beat the median; they lose to pure CPA when cohorts churn fast and to pure RevShare when retention is elite. The hybrid is the correct choice under uncertainty, which is why it has become the default structure for new affiliate relationships across iGaming and Forex programs.

CPA vs RevShare vs Hybrid at Different LTV Assumptions

One table settles the model choice: at $200 lifetime NGR per referred customer, CPA wins decisively; at $800+, RevShare wins; between $400 and $800, the hybrid is within 15% of the best option and is the rational pick under uncertainty. The table below values each model per 100 referred customers using a $120 CPA, 30% RevShare (NPV-discounted at 1.5% monthly across the retention window), and a $60 + 15% hybrid.

The asymmetry is structural: CPA value is flat in LTV while RevShare value is linear in it. Operators exploit this by steering affiliates with weak traffic toward CPA (capping operator downside on low-LTV cohorts) and affiliates with proven high-LTV traffic toward RevShare (sharing upside to retain super-affiliate loyalty). Affiliates should invert the logic: take CPA when your traffic converts broadly but retains poorly, and defend RevShare terms when your audience produces VIP-heavy cohorts. Fraud detection sits underneath all of this; CPA deals attract signup fraud and multi-accounting, RevShare deals attract bonus abuse, and the model mix changes which fraud surface a program must police.

How to Apply These Formulas in a Program Review

A quarterly program review applies all 8 formulas in 5 steps, moving from channel health down to individual deal terms. Run it with cohort-level data exported from your affiliate platform's reporting layer; blended monthly totals hide every effect the formulas are designed to expose.

1. Compute channel LTV:CAC and effective commission rate for the trailing 12 months; confirm ECR sits inside your vertical's target band before touching any individual deal.
2. Rebuild CPA breakeven per geo and traffic source from updated LTV data, then flag every active CPA deal paying above 60% of its segment breakeven.
3. Run the RevShare NPV comparison for your top 20 affiliates by volume using their actual cohort decay curves, and identify deals where the current model underpays or overpays by more than 20% against the alternative.
4. Audit negative carryover treatment and qualification rules across contracts; verify the written terms match what the commission engine actually computes, because silent mismatches are the top source of payment disputes.
5. Re-tier the deal menu: assign CPA to unproven or fast-churn traffic, hybrid to new relationships, RevShare to proven high-retention partners, and document the tier criteria in the partner portal so affiliates can self-qualify.

Methodology & Sources

The benchmark ranges on this page synthesize Track360 cross-program anonymized aggregates covering more than 40 operator programs with public program terms and industry-body data, and every worked example uses illustrative round numbers rather than any single program's data. The formulas themselves are standard financial arithmetic. Commission-range context draws on published regulatory frameworks for affiliate agreements from the MGA and UKGC, performance marketing standards from the IAB and the Performance Marketing Association, FTC endorsement disclosure requirements that shape US affiliate economics, and European market data published by the EGBA. Benchmark bands are estimates and vary by vertical, geo, and traffic mix; treat them as starting points for your own cohort math, not as guarantees.

Frequently Asked Questions

Five questions cover the calculations readers ask about most: EPC conventions, the CPA-vs-RevShare crossover, hybrid pricing, negative carryover, and the LTV:CAC target.