Online Sales Tax Calculator
Add sales tax to a price, or pull the tax back out of a total that already includes it — either way you get the net amount, the tax and the grand total. Handy for shopping, invoicing and bookkeeping, and it never leaves your browser.
- 100% free
- Private & safe
- Runs in your browser
Why use Sales Tax Calculator?
Sales Tax Calculator gives you accurate results instantly, with the underlying formula shown so you can trust the numbers.
- Runs instantly in your browser — nothing to install, nothing uploaded.
- Completely free, with no account, no watermarks and no usage limits.
- Handles Add: total = amount × (1 + rate ÷ 100); Extract: net = total ÷ (1 + rate ÷ 100).
- Choose whether to add tax or extract it from a total.
- Works on any device — desktop, tablet and phone — and is fully keyboard accessible.
How to use Sales Tax Calculator
- Choose whether to add tax or extract it from a total.
- Enter the amount and the tax rate.
- See the tax and the final or net amount.
- Copy the figures for your records.
Examples
- Adding 8.25% tax to a $100 purchase.
- Finding the tax portion inside a $108.25 total.
Formulas
- Add: total = amount × (1 + rate ÷ 100)
- Extract: net = total ÷ (1 + rate ÷ 100)
Limitations
- Uses a single flat rate; combined state/local rates should be summed first.
- Not tax advice — rules and rates vary by jurisdiction.
Frequently asked questions
Can it work backwards from a total?
Yes — use Extract mode to find the net amount and tax inside a tax-inclusive total.
Does it know my local rate?
No — enter your combined rate; the tool does the maths.
Is this tax advice?
No, it is an informational calculation only.
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