GST / VAT Calculator
Calculate GST or VAT inclusive and exclusive amounts. Enter any amount and tax rate to instantly see the tax amount, pre-tax price and total price. Supports custom tax rates for any country.
GST / VAT Calculator — Coming Soon
We are building a 100% client-side interface for this tool. In the meantime, use the formula below.
📐 How to calculate GST manually
To add GST: Amount × (1 + GST rate / 100)
To remove GST: Amount ÷ (1 + GST rate / 100)
Example: $100 at 18% GST = $100 × 1.18 = $118
The SolveBar GST and VAT Calculator lets you add tax to a base price or remove tax from a total to find the pre-tax amount. Supports any custom tax rate and works for GST, VAT, sales tax and any other percentage-based tax.
GST inclusive vs exclusive
GST exclusive means tax is added on top of the price — the displayed price does not include tax. GST inclusive means tax is already included in the displayed price. The calculator handles both modes instantly.
How to remove GST from a total
To find the pre-tax price when you have a GST-inclusive total, divide the total by (1 + GST rate). For 10% GST: divide by 1.10. The calculator does this in one step.
Common tax rates by country
India: 5%, 12%, 18%, 28% GST. Australia: 10% GST. UK: 20% VAT (standard), 5% reduced. EU: varies by country, typically 19–25%. USA: varies by state, typically 5–10% sales tax.
Frequently Asked Questions
How do I calculate GST on a price?
Multiply the base price by the GST rate as a decimal. For 18% GST on $100: $100 × 0.18 = $18 GST. Total is $118. The calculator handles this instantly for any rate.
How do I remove GST from an inclusive price?
Divide the inclusive price by (1 + GST rate). For an $118 price with 18% GST: $118 ÷ 1.18 = $100 base price, $18 GST.
Can I use this for VAT calculations?
Yes. VAT and GST are calculated the same way. Enter your VAT rate in the tax rate field and the calculator works identically.