Sales Tax Calculator

Estimate sales tax amount, total price after tax, pre-tax price from a total, and combined tax rate based on item price and tax percentages.

Calculate Sales Tax

Sales tax amount = taxable amount × combined tax rate. In reverse mode, pre-tax price = total ÷ (1 + combined tax rate), then tax is the difference between total and pre-tax amount.
Your result will appear here.

How the sales tax calculator works

Add tax mode:
The calculator adds sales tax to the taxable amount and shows the final total.

Reverse tax mode:
The calculator estimates the pre-tax amount from a total that already includes sales tax.

Combined rate:
State and local rates are added together to create one effective sales tax rate.

Extra amounts:
Taxable fees are included before tax, while non-taxable extras are added after tax.

Why sales tax estimates matter

Sales tax estimates help you understand the real cost of purchases and compare prices more accurately. They are useful for shopping, business pricing, invoices, and estimating after-tax totals.

This tool is especially helpful when switching between pre-tax and tax-included prices.

What your result means

Your result shows the combined tax rate, sales tax amount, taxable subtotal, final total, and pre-tax amount depending on the mode selected.

Sales tax calculator tips

Frequently asked questions

What is a sales tax calculator?

A sales tax calculator estimates the amount of sales tax owed on a purchase and the final total after tax.

What is reverse sales tax?

Reverse sales tax is the process of backing out the tax from a total amount to estimate the original pre-tax price.

Can local taxes be added to state tax?

Yes. In many places the total sales tax rate includes both state and local sales tax percentages.

Is this exact for every jurisdiction?

No. This is a simplified calculator and tax treatment can vary by product type, fee type, and local tax rules.