How it works
Enter any two values among before-tax price, tax rate, and after-tax price. The calculator fills in the third plus the tax amount.
after-tax = before-tax × (1 + rate) · before-tax = after-tax / (1 + rate)
When to use
Use this tool when you need to: $100 at 10% tax adds $10 — you pay $110 total.
How to use this tool
- Enter your values in the fields above.
- Review the formula and any mode options for your problem.
- Read the result and the step-by-step solution.
$100 at 10% tax adds $10 — you pay $110 total.
Frequently asked questions
- What is the Sales Tax Calculator?
- Enter any two values among before-tax price, tax rate, and after-tax price. The calculator fills in the third plus the tax amount.
- How do I use the Sales Tax Calculator?
- Enter the required values, then calculate. The Sales Tax Calculator shows results, formulas, and step-by-step work when available. No account is required.
- What formula does the Sales Tax Calculator use?
- after-tax = before-tax × (1 + rate) · before-tax = after-tax / (1 + rate)
- ROI CalculatorReturn on investment with investment gain, ROI percent, annualized ROI, and holding period.
- Discount CalculatorSolve any two of original price, discount, sale price, and amount saved — percent off or fixed amount off.
- Loan CalculatorAmortized payments, deferred lump-sum loans, and zero-coupon bond proceeds — with compounding separate from pay-back frequency.
- Amortization CalculatorMonthly payment, extra principal, and a full monthly plus annual amortization schedule.
- Mortgage CalculatorHome price, down payment, taxes, insurance, extra principal, and a full amortization schedule.
- Auto Loan CalculatorVehicle price or monthly budget, down payment, trade-in, tax, fees, and a full amortization schedule.
Browse categories