Sales Tax Calculator
Sales tax adds a percentage of the price on top of what you pay. This calculator adds the tax to a price, or works backward and pulls the tax out of a total that already includes it.
Enter the amount and your local rate, then pick the direction.
Price details
Your total
- Sales tax
- $8.50
- Before tax
- $100.00
- Total
- $108.50
Tax is 7.8% of the total, $8.50 of $108.50
What's inside the total
On a $100.00 price, tax adds $8.50 for a $108.50 total. 7.83% of that total is tax.
The numbers
| Before tax | $100.00 |
|---|---|
| Tax | $8.50 |
| Total | $108.50 |
Before you rely on this
Results are generic estimates using standard time-value-of-money formulas, the same math everywhere. Real-world figures depend on your country's tax rules, rounding, fees, and lender or product terms, which vary by jurisdiction. Treat this as a guide and confirm important numbers with a local professional.
How the sales tax calculation works
Adding tax: price times (1 + rate). Extracting it: divide the total by (1 + rate) to get the pre-tax price, and the difference is the tax.
Rates vary by country, state, and city, and some places call it VAT or GST. Enter whatever rate applies where you are. The math is the same.
Tips
- Tax rates differ by location and sometimes by product. Check your local rate.
- Pulling tax out of a receipt? Use the "find the tax inside a total" mode.
- VAT and GST behave exactly like sales tax in this calculation.
Frequently asked questions
How do I add sales tax to a price?
Multiply the price by the tax rate and add it back. For example, 100 at 8.5% gives 8.50 in tax, 108.50 in total.
How do I find the tax already inside a total?
Divide the tax-included total by (1 + rate) to get the pre-tax price. The difference is the tax. The calculator's second mode does this for you.
Is VAT the same as sales tax here?
For this calculation, yes. VAT and GST are both charged as a percentage of the price. Enter your rate and the math is identical.