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Invoicing & Payments

Invoicing & payment calculators

Get the totals right and get paid on time — invoice math, platform and processor fees, late fees and payment terms.

Calculators in this category

Invoice CalculatorCalculate an invoice total fast — quantity, rate, discount and sales tax/VAT, with the full breakdown shown.Open calculator →Payment Processor Fee CalculatorCalculate the net amount you'll actually receive after payment processor fees. Enter the charge, fee rate and fixed fee — see the math.Open calculator →Late Payment Fee CalculatorCalculate the late fee owed on an overdue invoice from the amount, days late and your contract's interest rate, with the math shown.Open calculator →
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Free, fast calculators for freelancers and one-person businesses. No sign-up, no fluff — just the math, with the working shown.

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Every calculator on SoloRateCalc is pure arithmetic — it applies a formula to the numbers you enter and returns an estimate. No rates or figures are sourced from official publications or external data. Results depend entirely on what you type in, are for informational purposes only, and are not financial, tax, legal or professional advice. Confirm any figure with a qualified professional before you act on it.

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