VAT / GST Calculator
Runs locally in your browser. Nothing leaves your device.Calculate net, tax and gross amounts from any VAT or GST rate entirely locally.
Calculate VAT or GST
Example value – check the rate applicable to your case.
Gross amount
$120.00
- Net amount
- $100.00
- Tax amount
- $20.00
- Gross amount
- $120.00
Calculation
Tax = net × rate ÷ 100; gross = net + tax.
This is a mathematical conversion. Check the applicable rate, tax status and rounding rules.
How it works
- 1
Choose the calculation task
Choose whether to calculate amounts from an amount and tax rate, or derive the tax rate from net and gross.
- 2
Enter amount, tax rate, and basis
Enter the amount and tax rate, and specify whether the tax is already included in the amount or not.
- 3
Review the result and calculation path
Review the net, tax, and gross amount as well as the formula used, and copy the result if needed.
Good to know
The VAT/GST calculator calculates the net, tax, and gross amount directly in your browser in three modes: adding tax to a net amount, extracting tax from a gross amount, or deriving the tax rate from a known net and gross amount. When a quantity is used, rounding can be applied either to the total or per unit.
Calculation runs locally in the browser. Tax rates, rounding rules, and deductibility differ by country, product, and invoice — the displayed calculation path makes clear which formula was used.
Typical use cases
Add tax to a net price
Enter a net amount and tax rate to determine the gross amount for a quote or invoice.
Extract tax from a gross price
Determine the included tax amount and net price from a known gross price, for example to check a receipt or final price.
Derive an unknown tax rate from net and gross
Enter a known net and gross amount to calculate the actually applied tax rate when it isn't stated directly.
Tips for better results
Pick the rounding mode that fits your case
Round-half-away-from-zero, round-half-to-even, or truncation can lead to slightly different totals across many line items — choose the mode that matches your accounting practice.
Watch the rounding scope with quantities
With multiple units, rounding can be applied to the total or to each unit individually — with many units, this can lead to slightly different final amounts.
Features
Three calculation modes
Add tax, extract tax, or derive the tax rate from net and gross.
Calculation path shown transparently
The formula used is shown for each mode, for example gross = net × (1 + tax rate ÷ 100).
Calculate locally
Calculation happens entirely in the browser, without transmission to a server.
Frequently asked questions
What calculation modes are available?
Adding tax to a net amount, extracting tax from a gross amount, or deriving the tax rate from a known net and gross amount.
How is tax extracted from a gross price?
Via the formula included tax = gross × tax rate ÷ (100 + tax rate); the net amount results as gross minus tax.
Are my inputs uploaded?
No. Calculation runs entirely locally in the browser.
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