🧾 GST / Tax Calculator
Add or remove tax from any amount instantly.
📋 How to Use
1. Enter an amount and the tax/GST percentage.
2. Choose whether to add tax to the amount or remove tax from an amount that already includes it.
3. Read the tax amount and final total instantly.
✅ Features
Works both ways: add tax on top, or extract tax already included in a price.
Supports any percentage rate, not a fixed regional default.
Useful for invoicing, quotes, or checking a receipt's tax math.
Add or remove sales tax from any price
This GST / sales tax calculator works out the tax amount and the final price for any tax rate. It works both ways: add tax to a price that does not include it, or find the original price from an amount that already includes tax.
Who uses it
- Shop owners and freelancers preparing quotes and invoices.
- Buyers checking that a bill has been calculated correctly.
- Accountants and students doing quick tax checks.
The formulas
Adding tax: tax = price × rate ÷ 100, total = price + tax.
Removing tax: original price = total ÷ (1 + rate ÷ 100).
A common mistake is to remove tax by simply subtracting the percentage from the total — that gives the wrong answer. For example, 1,180 with 18% tax included means an original price of 1,000, not 967.60.
Tax rates differ by country, province and product, and they change from time to time, so always check the current official rate for your case.