Calculator guide
Find sales tax and the tax-inclusive total from a purchase amount and tax rate.
Formula or method
Tax = price × rate; total = price + tax. For a tax-inclusive total, tax = total × rate/(1+rate).
How to use this calculator
- Enter the price before tax.
- Enter the applicable tax rate as a percentage.
- Review tax and total, and verify whether local rates are combined.
Worked example
A $75 purchase at 8.25% tax adds $75×.0825=$6.19, for a total of $81.19 after rounding.
Understanding the result
Tax rates and taxable items vary by jurisdiction. Use the result as a quick estimate at checkout.
Limitations and assumptions
- Excludes exemptions, caps, special district rates, shipping rules, and rounding policies.
- The calculator cannot determine which legal rate applies to your address.
Frequently asked questions
Is sales tax based on the shipping address?
Often, but rules vary by jurisdiction and transaction type.
Why can my receipt differ by a cent?
Tax authorities and retailers may round at line or invoice level.
Does this include use tax?
No; use-tax obligations are jurisdiction-specific.
Sources
Educational information only; verify important decisions with a qualified professional.