How do you find the tax rate from two amounts?

Tax rate = (post-tax amount − pre-tax amount) ÷ pre-tax amount × 100. This backs out the effective percentage that was added, useful when a receipt shows the total but not the rate.

How do you calculate tax forward from a rate?

Tax amount = amount × (rate ÷ 100), and total = amount + tax amount. This is the same math used to add sales tax, VAT, or any other percentage-based tax to a price.

Can I use this for sales tax, VAT, or income tax brackets?

It works for any flat-rate tax calculation, like sales tax or a single VAT rate. It doesn't model progressive income tax brackets, which apply different rates to different portions of income.

Is my financial data sent anywhere?

No. All calculations run locally in your browser with JavaScript — nothing is transmitted or stored.

TAX PERCENTAGE CALCULATOR

Find a tax rate from two amounts, or apply a known rate forward. Nothing leaves your browser.

Pre-tax amount

Post-tax amount

Tax rate7.5%

Tax amount6.00

How to use the tax percentage calculator

1
Choose whether to find a tax rate or apply a known rate.
2
To find a rate, enter the pre-tax and post-tax amounts.
3
To apply a rate, enter an amount and the tax rate percentage.
4
Read the tax amount and, depending on mode, the rate or total.

Questions

How do you find the tax rate from two amounts?: Tax rate = (post-tax amount − pre-tax amount) ÷ pre-tax amount × 100. This backs out the effective percentage that was added, useful when a receipt shows the total but not the rate.
How do you calculate tax forward from a rate?: Tax amount = amount × (rate ÷ 100), and total = amount + tax amount. This is the same math used to add sales tax, VAT, or any other percentage-based tax to a price.
Can I use this for sales tax, VAT, or income tax brackets?: It works for any flat-rate tax calculation, like sales tax or a single VAT rate. It doesn't model progressive income tax brackets, which apply different rates to different portions of income.
Is my financial data sent anywhere?: No. All calculations run locally in your browser with JavaScript — nothing is transmitted or stored.