Finance Calculators
Sales Tax Calculator
See the true checkout price before you buy. Enter any price and tax rate to get the tax amount and the total with tax — or work backwards from a tax-inclusive p
Private by design: this tool runs 100% in your browser. Nothing you enter is sent, stored, or tracked.
How to use this calculator
- Enter the pre-tax price.
- Enter the sales tax rate as a percentage (e.g. 8.5).
- See the tax amount and total instantly.
- Toggle 'reverse' to find the pre-tax price from a total that already includes tax.
The formula
Tax amount = price × (rate ÷ 100). Total = price + tax. Reverse: pre-tax price = total ÷ (1 + rate ÷ 100).
Worked example
A $249 item at 8.875% tax: tax = $249 × 0.08875 = $22.10, total = $271.10. Reverse: a $271.10 total at 8.875% means a pre-tax price of $271.10 ÷ 1.08875 = $249.00.
About this tool
See the true checkout price before you buy. Enter any price and tax rate to get the tax amount and the total with tax — or work backwards from a tax-inclusive price to find the pre-tax amount.
Frequently asked questions
What tax rate should I use?
Use your combined state + county + city rate — in the US this varies by address, commonly 0–10%+. Many states publish lookup tools by ZIP code.
Does this include VAT?
The math is identical for VAT/GST: enter the VAT percentage as the rate. Note that in VAT countries the displayed price usually already includes tax — use reverse mode.
Are shipping or discounts taxed?
It depends on your jurisdiction — some tax shipping and pre-discount prices, others don't. This calculator does the arithmetic; local rules decide what's taxable.
Can I calculate tax on multiple items?
Add the pre-tax prices together first, then enter the combined total with your rate — the percentage math works out the same.