VAT / Sales Tax Calculator
From net to gross, or from a tax-included price back to net. Any rate.
Working back from a tax-included price
Net = gross ÷ (1 + rate). At 20%, a 120.00 price is 100.00 net + 20.00 tax. The common mistake is subtracting 20% of the gross (120 − 24 = 96), which understates net by 4.00.
Rounding
Amounts are shown to two decimals without truncation. Some jurisdictions (Korea, for example) truncate tax to whole currency units on invoices; check your local rule if the cents matter.
Sales tax vs VAT
Sales tax is added once at the final sale; VAT is charged at each step and reclaimed by businesses. For a single price calculation, the arithmetic is the same.
Tips for common situations
Enter Gross Total for Reverse Tax Split
Type the tax-inclusive receipt or payment amount into the Gross field and the tool applies Net = Gross divided by (1 + Rate) to separate the net price and tax instantly. Adjust the rate percentage to match your local jurisdiction.
Update Net to Auto-Fill Tax and Total
Enter your service fee or product subtotal in the Net field and the tax amount plus gross total populate immediately. Both directions recalculate in real time, so you can edit any field without refreshing.
Change the Rate for Non-Standard Tax
Replace the default 10 % with any regional VAT, GST, or sales tax rate such as 5 %, 8 %, 19 %, or 20 %. The net, tax, and gross values update bidirectionally as soon as you modify the percentage.
Tried with sample values
Screens and numbers from actually running this tool with sample values (2026-10-06, Chromium-based browser on a Mac). Results vary with your input and device.
The input mode was set to total (VAT included) and 3,300,000 won was entered. The calculator splits it into a supply value of 3,000,000 won and VAT of 300,000 won at 10%, with fractions below one won truncated.
For tax-exempt or zero-rated cases, the page also shows that 3,000,000 won can be billed without VAT. The tax rate is set to 10% by default and can be changed.
Frequently asked
Is anything sent anywhere?
No. The arithmetic runs in your browser.
Which rate should I use?
The rate that applies where the sale is taxed. Common ones are listed as presets; type any other value.
Does it handle multiple tax lines?
No. It calculates one rate on one amount.
How does the tool calculate the net amount from a gross (tax-inclusive) total?
It calculates the net amount by dividing the gross total by (1 + tax rate), neatly separating the net price and tax portion.
Can I calculate taxes using rates other than the standard 10%?
Yes, you can change the default tax rate to any percentage needed for your calculation.
Will my financial inputs or calculated numbers be sent to a server?
No, all calculations happen entirely inside your browser, and no financial data is ever transmitted or stored.
Can I use this tax calculator while offline?
Yes, once the page has loaded in your browser, it continues to work without an active internet connection.