GST/VAT Calculator
Add or remove GST/VAT from an amount and see the net, tax, and gross values instantly in your browser.
How to use the GST/VAT Calculator
- Enter the amount.
- Enter the GST or VAT rate for your country, for example 18, 20 or 5.
- Choose Add tax if the amount excludes tax, or Remove tax if the amount already includes it.
- Click Run to see the net amount, the tax amount and the gross (tax-inclusive) total.
How the GST/VAT Calculator works
Adding tax to a net price is a simple percentage: Tax = Net × Rate ÷ 100 and Gross = Net + Tax.
Removing tax from a gross price is where people often go wrong. You can't just subtract the rate as a percentage of the gross amount, because the tax was calculated on the smaller net amount. Instead the calculator divides by one plus the rate: Net = Gross ÷ (1 + Rate ÷ 100) and Tax = Gross − Net. For example, 118 including 18% GST is 100 net plus 18 tax, not 96.76 net.
Frequently asked questions
- Is this GST/VAT calculator free?
- Yes. Calculate GST or VAT at no cost, with no account required.
- What's the difference between adding and removing tax?
- Adding tax calculates the tax on a net (pre-tax) amount. Removing tax extracts the tax already included in a gross (tax-inclusive) amount.
- Does this work for any country's GST or VAT rate?
- Yes. Enter the applicable rate for your country or region.