Quick answer
12,000 clicks converting at 3% on a $45 commission produce 360 sales and $16,200 of affiliate income — an EPC (earnings per click) of $1.35. Against $800 of spend, profit is $15,400 and cost per sale is $2.22. EPC is the number that lets you compare programmes.
How the Affiliate Link ROI works, step by step
Enter clicks (or traffic and click-through rate), conversion rate, average commission per sale, and what you spent to get the traffic. The calculator returns sales, total earnings, profit after spend, EPC (earnings per click), return on spend, and cost per sale. At the defaults — 12,000 clicks, a 3% conversion rate, a $45 commission and $800 of spend — the month produces 360 sales, $16,200 of revenue and $15,400 of profit.
EPC compresses commission rate, product price and conversion rate into one number: earnings divided by clicks, which equals commission multiplied by conversion rate. If you are evaluating paid traffic, compare EPC against your cost per click — a programme with a $1.35 EPC supports ad clicks up to roughly that figure before margin. If you are evaluating content, compare EPC between programmes on the same page.
Commission structure matters as much as the headline percentage. A 40% commission on a $30 product ($12) converts worse but pays less per sale than a 10% commission on a $300 product ($30); the calculator works in dollars per sale so the comparison is honest. Percentage commissions cannot be compared across price points.
Cookie duration is the hidden variable. Amazon Associates pays on purchases made within 24 hours of the click (or within 89 days for items added to the cart during that visit), while specialist programmes commonly allow 30 to 90 days. A programme that credits sales within 24 hours earns materially less than one with a 30 to 90 day window at the same rate, because considered purchases take days.
Amazon's fixed commission rates run from 0% to 10% by category: Luxury Beauty pays 10%, physical books, kitchen and automotive 4.5%, home, toys and furniture 3%, and grocery and health and personal care 1%. Amazon converts unusually well on warm traffic but pays low percentages, which is why its EPC often trails specialist programmes despite the conversion advantage.
The formula
Sales = clicks x conversion rate. Earnings = sales x average commission. EPC = earnings / clicks = commission x conversion rate. Profit = earnings - spend; ROI = profit / spend x 100.
Worked example — try it on the calculator above
Worked example: two programmes on the same review page
Programme A pays 8% on a $250 product = $20 per sale, converting at 4%: EPC = $20 x 4% = $0.80. Programme B pays 30% on a $60 product = $18 per sale, converting at 6%: EPC = $18 x 6% = $1.08. On 10,000 clicks, A earns $8,000 and B earns $10,800. The lower commission percentage wins because conversion and basket size beat the headline rate — the standard outcome when programmes are compared on EPC instead of percentage. If the page cost $800 to promote, B's profit is $10,000 against A's $7,200. The break-even cost per click for Programme B is its $1.08 EPC: paying $1.00 a click for 10,000 clicks would cost $10,000 and return $10,800, a thin $800 profit before tracking loss.
Frequently Asked Questions
What is EPC and why does it matter?
Earnings per click: total commission divided by total clicks. It compresses commission rate, product price and conversion rate into the single number that decides which programme to promote and whether paid traffic can work. Programmes and networks quote EPC precisely because percentage commissions cannot be compared across price points.
What conversion rate is typical for affiliate links?
Warm review and comparison traffic converts at roughly 2 to 6%; broad content traffic at 0.5 to 2%; email traffic often higher. Amazon's programme converts unusually well (frequently 5 to 10% on warm traffic) but pays low percentages (1 to 4.5% in most categories) and runs a 24-hour cookie, which is why its EPC often trails specialist programmes despite the conversion advantage.
How much traffic do I need to earn $1,000 a month?
Divide $1,000 by your EPC. At an EPC of $0.50, you need 2,000 clicks a month; at $1.20, about 835; at $0.10 (low-ticket, cold traffic), 10,000. Clicks are not visitors — at a 20% click-through from article to merchant, multiply the visitor target by five. This arithmetic sets realistic content volume goals.
Can affiliate marketing be profitable with paid ads?
Only when EPC comfortably exceeds cost per click, with room for the share of clicks that never convert and for tracking loss. Most affiliate programmes' EPCs ($0.10 to $1.00) sit below competitive CPCs in the same niche, which is why affiliates rely on search content, email and social reach rather than buying the traffic outright.
Estimates, not advice. This calculator provides educational estimates based on the inputs you enter and the assumptions shown on this page. It is not financial, tax or investment advice, and it cannot see your full situation. Verify important figures against official sources, and consider a qualified professional for decisions about your own money. See our Disclaimer and Methodology.