About sales tax calculator
Add a tax percentage to a price, or remove it from a tax-inclusive price, to see the amount before and after tax.
Formulas
- Price with tax = price × (1 + tax ÷ 100).
- Price without tax = tax-inclusive price ÷ (1 + tax ÷ 100).
India
In India GST replaced most older sales taxes. Use the GST Calculator for CGST and SGST splits.
A worked example
A bill of ₹1,180 that includes 18 percent tax has a price before tax of 1,180 ÷ 1.18 = ₹1,000 and tax of ₹180. Adding 18 percent to ₹1,000 returns the ₹1,180 total.
Mistakes to avoid
- Subtracting 18 percent of the total to remove tax. Divide by 1.18 instead.
- Adding two taxes by simply summing them when one is charged on top of the other.
- Forgetting that some goods have a different rate from others in the same bill.
