Finance

Sales Tax Calculator

Calculate sales tax both ways. Enter a pre-tax amount and rate to get the tax and total, or switch to reverse mode to pull the net price and tax out of a tax-inclusive total. Perfect for receipts, invoices and quick pricing checks — all client-side.

Examples

Input · 100 × 8.25 ÷ 100 = 8.25

Amount $100, tax rate 8.25%, Add mode

Output

Net $100.00, Tax $8.25, Total $108.25

How it works

“Add tax” starts from a pre-tax price: tax = amount × rate ÷ 100. “Extract tax” starts from a total that already includes tax and works backwards: net = total ÷ (1 + rate ÷ 100).

Add:      100.00 at 8.25%  →  tax 8.25, total 108.25
Extract:  108.25 at 8.25%  →  net 100.00, tax 8.25

The common mistake when working backwards is to take 8.25% off the total. That gives 99.32, not 100, because the tax was charged on the smaller pre-tax price. The calculator takes one rate, so add state, county and city rates together before entering them.

How to use Sales Tax Calculator

Pick a mode

Choose Add tax to add tax to a net amount, or Extract tax to break down a tax-inclusive total.

Enter the numbers

Type the amount and the tax rate as a percentage.

Read the breakdown

See the net price, tax amount and total side by side.

Why use this tool

Add tax or reverse-extract it from a total

Handles any tax or VAT rate

Clear net, tax and total breakdown

Runs fully in your browser — nothing is uploaded

Frequently asked questions

How does reverse mode work?

In Extract mode the amount you enter is treated as the tax-inclusive total. Net = total ÷ (1 + rate ÷ 100), and tax = total − net.

Can I use it for VAT or GST?

Yes. The calculation is the same for any percentage-based sales tax, VAT or GST — just enter the applicable rate.

Found a bug or have an idea?

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