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Key Features
Instant Calculation
Get accurate results in real time with our optimized algorithm.
Mobile Friendly
Fully responsive design. Works on all devices & screen sizes.
Privacy Focused
Your data stays on your device. We don't store any inputs.
100% Free
No hidden costs. This tool is completely free forever.
Sales tax rates vary by state, county, and city, making it easy to lose track of exactly how much a purchase will actually cost once tax is added.
This calculator takes a price and a tax rate and returns the tax amount and total price instantly.
How it works
Enter the price before tax and the sales tax rate as a percentage. The tool multiplies the price by the rate to get the tax amount, then adds that to the price for the total.
- Enter price before tax.
- Enter sales tax rate (%).
- Click Calculate to see your results.
Examples
Calculating tax on a purchase
A $100 purchase with an 8.5% sales tax rate adds $8.50 in tax, for a $108.50 total.
Who should use it
- Estimating the final cost of a purchase before checkout.
- Calculating tax owed on an invoice or receipt.
Industry applications
- Retail and e-commerce
- Personal budgeting
Advantages
- Calculates tax amount and total price in one step.
- Works for any tax rate, not just fixed presets.
Limitations
- Doesn't look up tax rates automatically — you need to know your local rate.
Common mistakes to avoid
- Using only the state tax rate when local city or county taxes also apply, understating the true total.
Best practices
- Use the combined total tax rate for your specific location, not just the state-level rate.
Tips
- Check your receipt or a recent purchase to confirm the exact combined tax rate for your area before relying on an estimate.