Sales Tax Calculator
Add sales tax to a pre-tax price, or extract the tax from a tax-inclusive total, with separate state and local rates.
Your inputs
Results
Total with tax
$108.00
- Sales tax
- $8.00
- Combined rate
- 8%
✓Exact calculation — rounded only for display
Inputs are never added to links for financial, salary or health calculators.
What this calculator does
Where sales tax is added at checkout, the total can include several combined rates. This tool adds or removes the combined tax.
Formula and method
Worked example
Calculated by this tool with its default inputs:
Inputs
- I have: The price before tax
- Amount: 100 (any currency)
- State / main tax rate: 6 %
- Local / additional tax rate: 2 %
Results
- Total with tax: 108
- Sales tax: 8
- Combined rate: 8%
How to read the results
Removing tax requires dividing, not subtracting the percentage.
Assumptions and limitations
- Rates and exemptions vary by product and location; enter your current rates.
Tax and payroll figures depend on rules that differ by country, region and year and change often. Enter official current rates, and consult the tax authority or a qualified adviser — nothing here is tax advice.
Questions
Why not subtract 8 % from the total?
Because the tax was calculated on the pre-tax price, not on the total.
Methodology and verification
- Result type
- Exact mathematical calculation (rounded only for display)
- Formula version
- 1.0
- Automated verification
- 3 reference and validation test cases, checked against independently computed values. The site cannot be built if any of them fail.
- Editorial review
- Awaiting human editorial review. The explanation was drafted with AI assistance; the formula and examples are verified by the automated tests above.
Privacy
Everything you enter is calculated in this browser and is not sent to Numerith or anyone else. Because this calculator can involve personal financial or health details, your inputs are never added to share links or saved to history. Privacy policy