Selling price markup calculator
A markup rule looks clean on a spreadsheet and then quietly misses your margin at checkout. Enter the cost and the markup you had in mind, then check whether the list price it produces still hits your target margin after Stripe's 2.9% + $0.30 comes out.
Worked example
The preset uses a $10.00 product cost, a $15.35 list price (53.5% markup over cost), a 30% target margin, and Stripe's standard 2.9% + $0.30 fee. No VAT, coupon, affiliate cut, or refund reserve.
Result
That is almost a 30% margin after Stripe takes $0.75. A plain $15 price keeps only $4.26 and misses the same margin target.
A 50% markup over a $10 cost gives you a $15 list price and a 33% gross margin — not 50%. After Stripe's 2.9% + $0.30, the $15 keeps $4.26 and the margin drops to 28.4%. Use the markup to draft a price, then check it against the margin you actually want.
On a $10 sale, $0.30 is 3% of the price before Stripe's percentage even runs. The same markup rule that holds up on a $50 product can quietly miss on a $10 one. Round the price up the few cents the fee asks for.
The math happens in your browser. No account, no saved data, no email gate.
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