Sales Tax Calculator

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

1. Choose whether to add tax or extract it from a total.
2. Enter the amount and the tax rate.
3. See the tax and the final or net amount.
4. 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.