VAT Calculator
Enter any of net, tax, or gross and get the other two
Type an amount into any one of the three fields — net, tax, or gross — and the other two update instantly for the tax rate you set.
Tax rate must be a number from 0 up to (but not including) 100.
The amount before VAT is added — the base you'd invoice before tax.
Net amount × tax rate. Can't be reverse-calculated alone when the rate is 0%.
The net amount can't be derived from the tax amount alone when the rate is 0%.
Net amount + tax amount — the tax-included price shown on a receipt or invoice.
How to use & notes
- Korea's standard VAT rate is 10%. Change the rate field to use this for any other country's VAT or sales tax.
- Enter the tax-included amount from a receipt or invoice into "Gross amount" to split it into net amount and tax.
- Enter the pre-tax amount into "Net amount" to see the tax you should charge and the resulting gross amount.
- Rounding happens to the nearest whole currency unit. Whichever field you last typed into is kept exactly as entered, and the other two are derived from it.
- This is a simple general calculator — it doesn't account for special schemes, zero-rated or exempt goods, or reduced-rate regimes.
Working…
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It hasn't frozen — the result will appear when the calculation finishes.
About VAT Calculator
Enter any one of three numbers, the net amount, the tax, or the gross amount including tax, and the calculator fills in the other two at whatever rate you set. The default is 10%, Korea's VAT rate, but the rate box takes any value from 0 up to (not including) 100.
The part most people get wrong is taking tax out of a price that already includes it. At 20%, the tax inside a gross price of 120 is 20, not 24: it is one sixth of the gross, not 20% of it. The calculator divides by (1 + rate), rounds the net amount to a whole unit, and sets tax as gross minus net so the two always add back to what you typed.
The US has sales tax, not VAT
There is no federal VAT in the United States. Most states, and many counties and cities, levy a retail sales tax instead. It is charged once, at the final sale to the consumer, and the combined rate depends on where the sale happens. A VAT is charged at every stage of production, and each business deducts the tax it paid on its own purchases, so only the value it added is taxed.
For the arithmetic of a single receipt the two work the same: price × (1 + rate). Put your combined state and local rate in the rate box. US prices are usually shown before tax, so you will mostly type the net amount; in VAT countries shelf prices normally include tax, so you will mostly type the gross amount.
Extracting tax from a VAT-inclusive price
Tax share of a gross price = rate ÷ (100 + rate). That is 1/11 at 10%, 1/6 at 20%, 21/121 at 21% and 1/21 at 5%. A €121 bill in Spain at 21% contains €21 of IVA. Subtracting 21% of 121 would give €25.41, which is wrong.
Rounding and multi-rate receipts
When the gross does not divide evenly the result must be rounded somewhere. This tool rounds the net amount to the nearest whole unit, so it is designed for currencies like the won or yen. For euros or dollars, enter cents as whole numbers, or treat the result as accurate to one unit.
Countries have their own rules for where rounding happens. Japan's invoice system, for example, rounds the tax once per rate per invoice rather than per line item. The calculator handles one rate at a time, so for a receipt with two rates, run each rate's subtotal separately.
Worked examples
Korean invoice, VAT included
- Input
Gross 110,000 / 10%- Output
Net 100,000 / VAT 10,000
110,000 ÷ 1.1. Taking 10% of 110,000 would overstate the tax by 1,000.
Spanish bill at 21% IVA
- Input
Gross 121 / 21%- Output
Net 100 / IVA 21
IVA is 21/121 of the gross.
Adding US sales tax
- Input
Net 2,500 (cents, i.e. $25.00) / 8.25%- Output
Tax 206 / Gross 2,706 → $2.06 tax, $27.06 total
2,500 × 0.0825 = 206.25, rounded to 206 cents. Entering cents avoids losing precision.
How to use it
- Set the tax rate (10% by default).
- Type the net, tax, or gross amount; the other two fields update immediately.
Frequently asked questions
How do I remove VAT from a price?
Divide the gross by (1 + rate). At 20%, divide by 1.2; the VAT is the difference.
Can I use this for US sales tax?
Yes. Enter your combined state and local rate. The calculator does not look up rates by address.
Does it handle zero-rated or exempt goods?
Enter 0% to get net equal to gross. It cannot work back from the tax amount at 0%, because any net amount gives zero tax.
Sources
Last reviewed:
About the results
Results depend on your inputs and assumptions. Check official sources or a qualified professional before using them for medical decisions, contracts or filings.