Adding up what the campaign actually cost

Start with the three numbers that make up your real spend: creator fee, prize value, and shipping or logistics. Most people only remember the creator fee — but if you paid a $1,500 creator fee, bought a $300 prize, and spent $50 getting it to the winner, your campaign cost $1,850, not $1,500. The total updates automatically as you type, so the calculation reflects the full campaign. If you also paid for promotion, design work, or an agency fee, add it as another cost — that field stays out of the way until you need it.

Why the number everyone else stops at isn’t the real one

Enter how many followers the campaign actually gained. This produces the gross cost per follower — the figure most basic CPF calculators stop at. For $1,850 and 2,000 new followers, that’s $0.93 each. It’s the number that treats every follower who showed up as if they’re still there.

Checking who actually stayed

Choose whether you want to estimate churn or enter your actual results. If you’re planning ahead, use the 30-day churn estimate — the presets start at 45%, a starting point based on research showing giveaway audiences typically lose 40-70% of new followers within a month. If your campaign already ran its course, switch to “Enter actual results” and type in how many followers are still following now; the calculator works out your real churn rate from that number instead of guessing.

Reading the follower reality

The bar below the headline splits your gross followers into who stayed and who left. Next to it, the price ladder shows both numbers side by side: the gross cost per follower, crossed out, next to what you actually paid per follower who’s still around. At 45% churn on the example above, 1,100 followers remain out of 2,000, and the real price climbs from $0.93 to $1.68 — a $0.76 gap that a gross-only calculation leaves out entirely.

Going a layer deeper on audience quality

Retained followers don’t all engage the same way a giveaway winner’s biggest fans would. If you want to see how much further the real number moves, turn on “Adjust for engagement quality too” and set what share of normal engagement your retained audience delivers. This produces a separate, clearly-labeled number — it never changes the cost-per-retained-follower figure above, because churn and engagement quality are two different problems and blending them into one number would hide which one is actually driving your cost.

Planning what would make the next one worth it

Set a target cost per retained follower, then ask the calculator one of two questions: how many followers you’d need to hit that target at your current churn estimate, or how much churn you can tolerate at your current follower count. Neither is a prediction — it’s a planning number you can compare against what actually happens next time.

Churn estimates are based on 2025-2026 research on giveaway-driven social accounts (cufinder.io, influencerfee.com), which found giveaway followers unfollowing at roughly 40-70% within 30 days — a wide range because giveaway audiences vary by prize type, platform, and niche. This tool’s default reflects the more conservative end of that range; adjust it to match what you’ve seen from your own account.