EPC (earnings per click)

EPC is calculated by dividing your earned commission by the number of clicks that produced it. If you sent 1,000 clicks to an affiliate programme and earned $400, your EPC is $0.40. EPC normalises across programmes with different conversion rates and commission structures, letting you compare a high-volume low-commission programme (Amazon) against a low-volume high-commission programme (direct SaaS) on equal terms.

The formula and the unit confusion. EPC = total commission ÷ total clicks. Most networks display it per click. ShareASale and a few legacy networks display it per 100 clicks (so $40 EPC at ShareASale equals $0.40 EPC at Amazon). Always check the network's unit before comparing across platforms; the numerical difference is two orders of magnitude.

EPC versus conversion rate versus average order value. Three related but distinct metrics. Conversion rate = sales ÷ clicks (a percentage). Average order value (AOV) = total sales value ÷ number of sales. EPC = CR × AOV × commission rate. EPC bundles all three into one number, which is why it is convenient for comparing programmes but loses diagnostic detail. If your EPC drops, you cannot tell from EPC alone whether the cause is fewer conversions, smaller orders, or a rate cut. Look at the components.

What "good EPC" means by niche. Numbers vary so widely that benchmarks are mostly useless across niches. Within Amazon Associates, blended EPC for general consumer goods runs $0.10 to $0.50; tech and electronics often $0.20 to $0.70; books and media closer to $0.05 to $0.15. Direct SaaS programmes commonly run $1 to $5 EPC at scale (high commission, lower volume). Finance and insurance affiliates can run $5+ EPC. The right comparison is always within the same niche on the same network.

EPC at the link level versus programme level. Programme-level EPC tells you whether a programme is worth participating in. Link-level EPC tells you which specific pieces of content are pulling weight. A 100-link Amazon portfolio with a $0.40 programme EPC might contain 20 links earning $1.50 and 60 earning $0.05; the average hides the distribution. Sub-IDs are what unlock link-level EPC reporting.

EPC as a leak detector. This is the highest-leverage use of the metric. If an individual link's EPC drops 70% one quarter while its click volume stays the same, the link is almost certainly broken. The page still loads (status 200), your audience still clicks, but conversions stopped flowing through. The most common causes are an ASIN reassignment, a soft 404 on the destination, or tag stripping in the redirect chain. EPC delta is the cleanest single signal you can monitor; a steady link's EPC is naturally noisy at the day level but stable at the week or month level. A sudden multi-week step-down is rarely random.

EPC inflation to avoid. Buying paid traffic to flatter your own EPC. Counting clicks from your own IP. Ignoring bot-filtered traffic in the numerator (which inflates EPC artificially). Networks check for the first two and can ban accounts; the third just misleads your own reporting.

EPC in the broader portfolio. Quarterly EPC review across all your active links surfaces the bottom-quartile content that is no longer earning, which is often more valuable than chasing new placements. Most established creators discover that the bottom 20 to 30 percent of their links contribute under 5 percent of revenue. Pruning or rewriting those is usually higher-ROI than producing new content.