Free tools
Free tools for bootstrapped makers
Free calculators for pricing a bootstrapped product. They run in your browser, and every payment fee comes from the provider's own pricing page, with the date we checked it.
Payment fee calculator
See what Stripe, PayPal, Lemon Squeezy, Paddle and Polar take from a sale, with UK, EU and US rates, tax handling and sources checked 19 October 2026.
Ramen profitability calculator
Work out how many paying customers cover your monthly costs after payment fees, the MRR that takes, and how many new customers replace churn each month.
Want the raw numbers? The payment processor fee dataset lists the published fees of nine payment processors, with a source link for every row.