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Explore formula guides that explain the equations, variables, and assumptions behind each calculator.

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Supporting formulas across every calculator category.

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Etsy Ads Cost Calculator FormulaLearn how Etsy Ads spend, clicks, orders, revenue, cost per order, and ROAS are estimated from your campaign inp...View formulaEtsy Ads ROI FormulaLearn how Etsy ad revenue, profit, cost metrics, and ROI are estimated from clicks, conversion rate, order value...View formulaEtsy Promoted Listing Profit FormulaLearn how an Etsy promoted listing profit estimate is calculated from price, costs, fees, ad spend, clicks and c...View formulaEtsy Net Profit FormulaLearn how the Etsy Net Profit Calculator estimates profit per order, margin, and total profit from sale price an...View formulaEtsy Gross Profit FormulaLearn how Etsy gross profit, total fees, and gross margin are calculated for a single order.View formulaFreelance Take Home Pay FormulaLearn how freelance take-home pay is estimated from revenue, expenses, tax, self-employment contributions, and r...View formulaFreelance Tax Calculator FormulaLearn how the freelance tax calculator estimates profit, taxable income, total tax, tax due, and after-tax income.View formulaFreelance Self Employment Tax FormulaLearn how freelance self-employment tax, income tax, total tax and net income are estimated from revenue, expens...View formulaFreelance VAT FormulaLearn how a freelance VAT calculator works when adding VAT to a net invoice or removing VAT from a VAT-inclusive...View formulaFreelance National Insurance FormulaLearn how freelance National Insurance is estimated using annual profit, Class 2 rules, and Class 4 profit bands.View formulaFreelance Income Tax FormulaLearn how the freelance income tax calculator estimates profit, taxable income, total tax, and net income after...View formulaCommission Calculator FormulaLearn how commission earned, total pay, and effective commission rate are calculated in a commission calculator.View formula