GST & VAT calculator
GST & VAT calculator: use amount, supplied tax rate, tax treatment. Review the formula, worked example and calculation steps.
Inputs
Use the units shown—
Enter your values and select Calculate.
Formula & explanation
Add: gross = net × (1+r/100); remove: net = gross ÷ (1+r/100)
Variables & units
- Amount
- Numeric value · minimum 0, maximum 1000000000000
- Supplied tax rate
- % · minimum 0, maximum 100
- Tax treatment
- Select an option
Worked example
100 plus 18% is 118; removing 18% from 118 gives 100.
Assumptions
Use the rate applicable to your transaction. No jurisdiction or current tax rate is inferred.
Formula version 1.0.0. JavaScript floating-point arithmetic applies. Results display up to 6 decimal places; stored values retain available precision. Use the units shown.
Practice with an example
Use the default input values to find the answer. The reset icon restores those values.
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