Our free sales tax calculator works in two directions: add sales tax to a pre-tax amount to get the total, or subtract tax from a tax-inclusive total to find the original pre-tax price. Pick a US state preset (California 7.25%, New York 8.875%, Texas 8.25%, Florida 6.5%, Washington 9.29%, Illinois 10.25%, Pennsylvania 6%, Georgia 7.4%, Arizona 8.37%, Massachusetts 6.25%) or enter a custom rate for local jurisdictions. The calculator instantly returns the tax amount, total or pre-tax price, and effective rate, with a clear breakdown suitable for receipts, invoices, and online purchases.
Pre-tax amount → total with tax
Auto-fills from state preset; edit to override (picks Custom)
| State | Rate | Tax | Total |
|---|
Add Tax (to a pre-tax price) or Reverse (extract from a total).
Your pre-tax price or tax-inclusive total.
Pick a US state preset or enter a custom rate.
See tax amount, pre-tax price, total, and effective rate instantly.
Forward: multiply the pre-tax price by the rate to get tax, then add to get the total. Reverse: divide the tax-inclusive total by (1 + rate) to recover the pre-tax price, then subtract to get the tax portion.
Tax = Amount x Rate; Total = Amount x (1 + Rate); Pre-tax = Total / (1 + Rate)
California state base rate is 7.25% but local districts can push it to 10.25%+
New York City combined rate is 8.875% (4% state + 4.5% city + 0.375% MCTD)
Five states have no statewide sales tax: Alaska, Delaware, Montana, New Hampshire, Oregon
Use reverse mode when your receipt shows only the total and you need to back out the tax
Sales tax is generally charged on tangible goods; many services, groceries, and prescription drugs are exempt
Online purchases are taxed based on the buyer's shipping address (post-Wayfair ruling)
For compound taxes (e.g., Quebec GST + QST), apply each rate sequentially, not summed
Instantly add sales tax to a pre-tax amount or reverse-calculate the pre-tax price from a tax-inclusive total. Includes presets for California, New York, Texas, Florida, and other major US states, plus a custom-rate option for any local jurisdiction.
US sales tax rates vary widely by state and local jurisdiction. California's state base is 7.25% (highest in the US), while Oregon, New Hampshire, Montana, Delaware, and Alaska charge no statewide sales tax. Use our state presets for quick estimates or enter a custom combined rate.
If your receipt shows only the total, switch to Reverse mode. The calculator divides the total by (1 + rate) to recover the pre-tax price — useful for expense reports, bookkeeping, and backing out tax from tax-inclusive quotes.
For a $100 purchase: California 7.25% = $7.25 tax ($107.25 total); NYC 8.875% = $8.88 ($108.88); Texas 8.25% = $8.25 ($108.25); Florida 6.5% = $6.50 ($106.50); Chicago 10.25% = $10.25 ($110.25).
Data sourced from trusted institutions
All formulas verified against official standards.