Sales Tax Calculator
Add sales tax to a price, or work out the tax already included in a total.
Sales Tax Calculator
Add sales tax to a price, or work out the tax already included in a total.
Starts in your browser. Instructions are below.
How to use Sales Tax Calculator
- 01Pick 'Add tax to price' or 'Extract tax from price'.
- 02Enter the price and your tax rate.
- 03Set a quantity to see totals for more than one item.
About Sales Tax Calculator
This sales tax calculator adds tax to a net price, or works backwards to pull the tax out of a total that already includes it. Adding tax is simple multiplication: multiply the net price by one plus the rate. Working backwards is where people go wrong, because you cannot just subtract the percentage from the total.
To find the tax inside a total, the calculator divides by one plus the rate to get the net price, then subtracts. For example, at an 8% rate a $108 gross price contains $8 of tax, not $8.64. The gap looks small on one item but adds up across an invoice, which is why extract mode matters for reconciling receipts.
Frequently asked questions
- How do I remove tax from a total?
- Divide the total by 1 plus the tax rate. Switch this calculator to 'Extract tax from price' and it does that step for you.
- Does it work for VAT or GST?
- Yes. The math is the same for VAT, GST or any sales tax, so just enter your local rate.
- Can I calculate tax on multiple items at once?
- Yes, enter a quantity and the calculator shows per-item and total net, tax and gross amounts.
- Are local tax rates built in?
- No. Rates vary by city, county and country, so enter the combined rate that applies to your purchase.
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