Sales Tax & VAT Calculator United States
Add or remove sales tax, VAT or GST from any price.
Results update as you type.
About this calculator
United States applies Sales Tax at 7%. Enter a price to add or remove Sales Tax in USD. The 7% Sales Tax rate applies to the net price; switch modes to add Sales Tax to a price or extract it from a USD total.
This calculator adds a sales tax, VAT or GST rate to a net price, or works backwards to strip the tax out of a gross price. To add tax you multiply the net amount by the rate and add it on; to remove tax you divide the gross amount by (1 + rate ÷ 100), because the gross figure already contains the tax. The default rate is pre-filled for your country and you can override it for any local or reduced rate.
For example, at a 20% rate a 100 net price becomes 120 gross — the tax is 20. Running it the other way, a 120 gross price divided by 1.20 gives a 100 net price, confirming the same 20 of tax. Set the quantity under advanced options to apply the tax across several items at once.
Use it at the checkout to see the real total before you pay, to pull the tax out of a receipt for expenses or bookkeeping, or to quote a customer a price that already includes VAT or GST. Sales tax, VAT and GST are all handled the same way — only the rate and the name differ by country.
Frequently asked questions
How do I remove VAT from a price?
Divide the gross price by (1 + rate/100). For 20% VAT, a £120 gross price is £120 ÷ 1.20 = £100 net, so the VAT is £20. Switch the direction to "Remove" to do this.
What rate should I use?
The default is your country’s standard rate, but many goods have reduced or zero rates. Enter the exact rate that applies to your purchase.
What is the difference between sales tax, VAT and GST?
They are all consumption taxes added to the price of goods and services. US sales tax is added only at the final sale; VAT (Europe) and GST (Australia, Canada, India and others) are collected at each stage of supply. For a shopper the maths is the same — enter the rate and the calculator handles it.
How do I add tax to a net price?
Multiply the net price by the rate as a decimal and add it on. A 100 price at 20% gains 100 × 0.20 = 20 of tax, for a 120 gross total. Keep the direction set to "Add" to do this.
How do I work out tax on several items?
Enter the price of one item and set the quantity under advanced options. The calculator multiplies the price by the quantity first, then adds or removes the tax on the combined amount.
Why does removing tax not use the same percentage?
Because the tax was calculated on the smaller net price, not the larger gross price. Removing 20% is not the same as taking 20% off the gross figure — you divide by 1.20 instead, which is why a 120 gross price yields 20, not 24, of tax.
API — use this calculator from code
Call this calculator as a free JSON endpoint — no key required. Send the field values below as query parameters or JSON. Read the full API docs →
Endpoint
GET https://calculator.free/api/v1/sales-tax/curl
curl "https://calculator.free/api/v1/sales-tax/?amount=100&rate=7.0&mode=add"JavaScript fetch()
const r = await fetch(
"https://calculator.free/api/v1/sales-tax/?" + new URLSearchParams({
"amount": "100",
"rate": "7.0",
"mode": "add"
}));
const data = await r.json();
console.log(data.results);Results are estimates for general guidance only, not financial, medical or tax advice.