final price = price × (1 − discount)Apply successive discounts one after another; adding their percentages usually gives the wrong saving.
Calculate
Sales tax calculator
Add sales tax to a price or extract tax from a tax-inclusive total.
LocalFree
This tool runs on your device in the browser.
Instructions and limitations
TOOL GUIDE
What this tool is for
Sales tax calculator — Add sales tax to a price or extract tax from a tax-inclusive total.
Useful for quick everyday estimates and for checking arithmetic with clearly entered values.
Common uses
- Check everyday arithmetic
- Compare possible values
- Create a quick estimate
Educational and informational use
Results are general estimates, not legal, financial, tax, medical, engineering, or other professional advice. Check inputs and units and consult a qualified professional for important decisions.
EXPLANATION & EXAMPLE
Understand the result—not just the number
$80 with 25% off = $80 × 0.75 = $60After calculating, the tool shows the values used and the working so you can check it.