Quick answer
Add or remove value-added tax at the rate you enter. Enter amount, vAT rate and calculation and the vat calculator returns price including VAT, vAT amount and price excluding VAT.
Related tools: VAT Calculator: Add or remove VAT at a rate you enter.
This page covers the same calculation as the vat calculator page; the two give identical results.
How to use the VAT Calculator
- Enter amount ($) (0 or more).
- Enter vAT rate (%) (between 0 and 100).
- Choose calculation: Add VAT to a net price and Remove VAT from a gross price.
- Press Calculate to see the result, and use Reset to start again.
| Input | What to enter | Allowed values |
|---|---|---|
| Amount | A number, in $ | ≥ 0 |
| VAT rate | A number, in % | ≥ 0, ≤ 100 |
| Calculation | Choose one: Add VAT to a net price; Remove VAT from a gross price | Starts at Add VAT to a net price |
Formula and method
Formula
gross = net × (1 + rate ÷ 100); net = gross ÷ (1 + rate ÷ 100)
IEEE-754 double precision; money shown to cents, rates to 4 decimals. Results are estimates, not financial advice.
Rates differ by country and product, so you enter the rate that applies.
Worked examples
These examples are verified: each one is an automated test case that the live calculator must reproduce exactly.
Example 1
Inputs: Amount = 100; VAT rate = 20; Calculation = Add VAT to a net price.
| Result | Value |
|---|---|
| Price including VAT | $120.00 |
| VAT amount | $20.00 |
| Price excluding VAT | $100.00 |
Example 2
Inputs: Amount = 120; VAT rate = 20; Calculation = Remove VAT from a gross price.
| Result | Value |
|---|---|
| Price excluding VAT | $100.00 |
| VAT amount | $20.00 |
| Price including VAT | $120.00 |
Example 3
Inputs: Amount = 59.99; VAT rate = 7.5; Calculation = Add VAT to a net price.
| Result | Value |
|---|---|
| Price including VAT | $64.49 |
| VAT amount | $4.50 |
| Price excluding VAT | $59.99 |
The first line is the headline result (price including VAT). Below it the vAT Calculator lists vAT amount and price excluding VAT, which describe the same case from other angles. IEEE-754 double precision; money shown to cents, rates to 4 decimals. Results are estimates, not financial advice.
How the result changes with amount
Holding every other input at the first worked example, this table changes only amount. It shows how sensitive the answer is to that one value; each row was produced by running this calculator.
| Amount | Price including VAT | VAT amount | Price excluding VAT |
|---|---|---|---|
| 50 | $60.00 | $10.00 | $50.00 |
| 100 | $120.00 | $20.00 | $100.00 |
| 200 | $240.00 | $40.00 | $200.00 |
| 400 | $480.00 | $80.00 | $400.00 |
What happens with invalid input
These messages are produced by the calculator itself, so you know what to fix.
- Amount: entering "-1" shows "Amount must be at least 0." beside that field and no result.
- VAT rate: entering "101" shows "VAT rate must be at most 100." beside that field and no result.
Choosing between the VAT Calculator and similar calculators
Each row shows what a related calculator on this site asks for and what it returns, so you can pick the one that matches your question.
| Calculator | You enter | It returns |
|---|---|---|
| [VAT Calculator](/tax/vat-calculator/) | calculate, amount and vAT rate | Total including tax |
| [Adjusted Gross Income (AGI) Calculator](/finance/agi/) | wages, salaries and tips, interest and ordinary dividends and business or other net income | Adjusted gross income |
| [MAGI and Roth IRA Contribution Calculator](/finance/magi-calculator/) | adjusted gross income, add-backs and tax year | Modified AGI |
| [Lottery Tax Calculator](/tax/lottery-tax/) | prize, federal tax rate and state tax rate | Net after tax |
| [Effective Corporate Tax Rate Calculator](/tax/effective-corporate-tax-rate/) | income tax expense and pre-tax income | Effective tax rate |
Background: personal finance estimates
Financial calculators project from the numbers you give them. Long-range tools depend on guesses about returns and tax rates that are unlikely to hold exactly, payoff tools assume a fixed payment and rate, and tax or salary results depend on the tax year, filing status and country. Official calculators say their output is for reference only.
For decisions that matter, use conservative inputs and check the figures against your lender, plan documents or a qualified adviser.
Assumptions and limitations
- 0% leaves the price unchanged
Results are estimates for planning, not financial advice. Lender terms, fees, taxes and rounding rules can change real figures, so confirm important numbers with your lender or a licensed adviser.
If a required value is empty, not a number, or outside its allowed range, the form marks that field with a message and shows no result instead of a misleading number. The automated checks deliberately try invalid entries for amount and vAT rate to confirm this.
Frequently asked questions
What does the VAT Calculator calculate?
Add or remove value-added tax at the rate you enter. It returns Price including VAT, VAT amount and Price excluding VAT.
What formula does the VAT Calculator use?
gross = net × (1 + rate ÷ 100); net = gross ÷ (1 + rate ÷ 100). Rates differ by country and product, so you enter the rate that applies.
What do I need to enter in the vAT Calculator?
You enter Amount ($), VAT rate (%) and Calculation.
How is the result rounded or limited?
IEEE-754 double precision; money shown to cents, rates to 4 decimals. Results are estimates, not financial advice. 0% leaves the price unchanged.
What does the “Calculation” option change?
It sets how the vAT is worked out. The choices are Add VAT to a net price and Remove VAT from a gross price.
What is an example of a vAT result?
With amount 100, vAT rate 20 and calculation Add VAT to a net price, the price including VAT is $120.00.
Can I rely on this calculator for a decision?
Results are estimates for planning, not financial advice. Lender terms, fees, taxes and rounding rules can change real figures, so confirm important numbers with your lender or a licensed adviser. For this calculator in particular: 0% leaves the price unchanged.
Related calculators
- VAT Calculator — Add or remove VAT at a rate you enter.
- Lottery Tax Calculator — Take-home from a prize after the tax rates you enter.
- Effective Corporate Tax Rate Calculator — Tax expense as a share of pre-tax income.
- Auto Loan Calculator — Monthly car payment after down payment and trade-in.
Sources
- Standard time-value-of-money relations (e.g. Brealey, Myers & Allen, Principles of Corporate Finance)
Content last reviewed 2026-11-04. Formulas and worked examples are checked by automated tests against independently computed values.