Sales Tax Calculator | Add or Reverse Local Tax
Calculate the final total including state and local sales tax, or reverse-calculate the pre-tax price from a final receipt total.
When Should You Use This Calculator?
- Calculating final prices including sales tax
- Comparing tax-inclusive prices across different tax rates
- Tracking sales tax calculations for budgeting
- Planning purchases with tax calculations across multiple scenarios
Key Features:
- Three modes: Simple, Reverse, and State Quick
- Add or remove sales tax from prices and reverse pre-tax totals
- State quick presets for faster local-tax estimates
- Support for any tax rate percentage
- Real-time calculation showing net price, tax, and total
Frequently Asked Questions
How is sales tax calculated?
Multiply the item price by the tax rate. Example: $100 item × 8% tax (0.08) = $8 tax. Total = $108. Our calculator handles both tax-inclusive and tax-exclusive modes.
How do I reverse-calculate the pre-tax price from a total?
Divide the total (tax-included) price by (1 + tax rate). For example, if you paid $108 and the tax rate is 8%, the pre-tax price is $108 / 1.08 = $100. Use Remove Tax mode in this calculator to do this instantly.
Does this calculator cover combined state and local sales tax?
Yes. Enter the combined rate (state + county + city) as a single percentage. For example, if your state rate is 6% and local rate is 2%, enter 8%. The calculator applies it to your item price and shows the breakdown.
Can I look up a state sales tax rate instead of typing it in?
Yes. The Preset Rates field is a searchable picker covering all 50 states plus Washington, D.C. — search by state name or two-letter code (e.g. "CA" or "TX") to fill in that state's base rate. Alaska, Delaware, Montana, New Hampshire, and Oregon charge no state sales tax, so their preset is 0%. Presets use state-level base rates; add your local county/city rate on top for the exact combined amount.
Can I export my Sales Tax Calculator calculations?
Yes. In guest mode you can export your calculations to JSON. Signing in adds PDF and CSV export. Click the export button to download your results — useful for record-keeping, sharing, or importing into other tools.
Does this calculator save my history?
Yes. Your calculation history is saved automatically. As a guest you can keep up to 50 calculations per workspace on your device. Sign in for free to keep up to 100 per workspace and access them from any device.
Is this calculator free to use?
Yes. The Sales Tax Calculator is free to use with no sign-up required. A free account adds more calculation history, multiple workspaces, and access to your saved data from any device.
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