Add sales tax to a net amount or back out tax from a gross amount. Works for US sales tax rates you enter (state/local). Currency selector included.
Sales Tax / GST Calculator
Results use the currency you select (display only — amounts are not converted).
How to Use
- Select currency and tax rate.
- Choose add tax or extract tax.
- Enter amount and calculate.
Formula
Gross = net × (1 + rate/100). Net = gross / (1 + rate/100). Tax = gross − net.
Worked Example
Example: $100 net at 8% tax → $108 gross. $108 gross at 8% → $100 net.
What the Result Means
Use the rate that applies to your purchase location. Rates vary by state and city in the US.
Important Notes & Limitations
- Does not look up live tax rates by ZIP code.
- Not tax advice.
Frequently Asked Questions
Is this only for GST?
No—enter any percentage sales tax or VAT-style rate.
US state tax?
Enter your combined rate manually.
Inclusive vs exclusive?
Use add tax for exclusive prices; extract for tax-inclusive totals.
Currency?
Label only.
Related Calculators
See also: Loan EMI, Mortgage, Compound Interest, Percentage.
Disclaimer: Results are approximate and for educational and informational purposes only. They are not financial, tax, medical, or legal advice. Verify important decisions with a qualified professional.