Free calculators for advertisers, marketers and online sellers. Every tool shows its formula, worked examples and what the result means, so you can check the math instead of just trusting a number.
Marketing CalculatorsFee CalculatorsMarketing calculators
Ad and marketing metrics that follow your campaign from impressions to customers. See all marketing calculators.
Find your cost per 1,000 impressions, plan an ad budget, or see how many impressions a budget buys.ROAS Calculator
Find return on ad spend, break-even ROAS from your margin, ACoS, and the revenue you need for a target.CTR Calculator
Find your click-through rate from clicks and impressions, or work out clicks from a target CTR.CPA Calculator
Find your cost per acquisition, plan a budget, and see your break-even CPA from order value and margin.CAC Calculator
Find your customer acquisition cost from marketing and sales costs, and compare it with customer lifetime value.
Fee calculators
See what payment platforms really take, what lands in your account, and what to charge to receive a set amount. See all fee calculators.
See Stripe’s fee and your net payout on a sale, or what to charge to receive a set amount.PayPal Fee Calculator
See PayPal’s fee and your net payout on a sale, or what to charge to receive a set amount.
Why trust these calculators
Every number on this site comes with its working, so you never have to take a result on faith.
Formulas you can check
Every page shows the formula behind the result, with worked examples you can follow.
Sourced numbers
Fee rates and benchmarks come from named sources, with the date they were last checked.
Tested by hand
Each calculator is tested against hand-worked examples before it goes live.
Private by design
The calculators run in your browser. Nothing you type is sent anywhere.
About HowCalculate
Meet Ajay Kumar
I’m an SEO strategist and content writer with more than four years of experience. I built HowCalculate because most online calculators give you a number and nothing else. Here, every result comes with its formula, a worked example and a source.
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Marketing CalculatorsFee Calculators