Affiliate Program ROI Calculator

The Affiliate Program ROI Calculator walkthrough is the how-to and the methodology behind the calculator itself — the assumptions you need to defend before signing an Aussie creator or affiliate to a network, and the levers that move a defensive versus a generous program across the line. If you are an Australian operator standing up an in-house affiliate programme, the numbers in this guide are the ones that decide whether your payouts make you whole on day one or quietly erode your margin over the first 12 months.

What the calculator does

The calculator accepts five levers — average order value (AOV), referral conversion rate, EPC (earnings per click), commission rate, and cookie window — and projects a defensible 12-month revenue per referral and a payback window per affiliate. It runs entirely in your browser, with no sign-up, no email gate, and no data sent anywhere; the model updates as you move the levers. The numbers below are the framework the calculator applies internally; replay them on a spreadsheet if you want to walk the path before opening the interactive surface.

The five levers, in order of weight

• Average order value (AOV) — the dollar value of the plan the affiliate is sending you. A $A 49 starter plan and a $A 499 business plan have entirely different referral economics; do not average them in the same model.
• Referral conversion rate — the share of referred clicks that convert to a paying customer inside the cookie window. 1.5–3% is typical for a B2B SaaS affiliate programme from a credible audience.
• Earnings per click (EPC) — the revenue you earn per click across the entire cohort, including non-converting clicks. EPC is what a network will quote you on its affiliate-page ranking, and it is usually lower than the per-conversion math suggests.
• Commission rate — the headline % the affiliate takes. For recurring programmes, this compounds over the customer lifetime; for one-time-payout programmes, it pays out on first sale only.
• Cookie window — the number of days the referral credit stays attached to a click. 30, 60 and 90 days are standard SaaS ranges; longer windows shift conversion decisively into the programme's favour.

How to set a defensible commission

Start from the customer lifetime value (LTV) of a paying subscriber, not from the headline commission a competitor is paying. Subtract your fully-loaded CAC envelope (hosting, support, refunds) from LTV to land at the maximum commission you can pay without making the cohort net-negative. Then split that envelope into a base rate plus a tiered kicker for affiliates who send paying customers rather than free-plan sign-ups; the tiered shape keeps the payouts honest without rewarding top-of-funnel volume that does not convert.

A worked example, in round numbers

A $A 99/mo SaaS with a 24-month average customer lifetime, a 2% referral conversion rate, a 30-day cookie, and a 30% recurring commission: every 100 referred clicks produces roughly 2 new customers, who together generate $A 4,752 in commissions over the year. Each referred click has an expected commission cost of $A 47.52. If your EPC from an affiliate source is below $A 47.52, that source is paying you to lose money, even before you count their support and refund load. The calculator does this end-to-end on your real numbers.

Frequently asked questions

Are the calculator's outputs a guarantee?

No — the calculator is a model, not a forecast. The numbers it produces are as good as the assumptions you feed in, and the assumptions (your true LTV, your actual referral conversion rate, your cookie credit decay curve) are the things most programmes get wrong. Treat the output as a directional read rather than a contractual projection.

Do I need to share my model with prospective affiliates?

Probably not — sharing internal LTV blunts your negotiating position. But do publish the commission rate, the cookie window, the payout terms, and the rules on self-referrals and brand bidding. Affiliates make confident recommendations when the programme's shape is clear; opaque programmes get dropped quietly within a quarter.

The calculator is editorial guidance, not legal, tax or financial advice. Confirm your programme terms with an Australian accountant before launching.

Verdict

A defensive affiliate programme is built on LTV minus CAC, not on matching what a competitor is paying. Use the five levers in the order above, default to recurring commissions only when the customer lifetime can sustain them, and tier your payouts by conversion quality rather than referral volume.