Add or extract VAT: calculate net amount without VAT in a few keystrokes.
VAT Calculator Usage: Simply enter the gross sum, choose VAT calculation operation (include or exclude), tax percentage, and press «Calculate» or hit enter to calculate the VAT amount. By default, the online VAT calculator rate is set for UK VAT calculation.
To calculate VAT from the gross amount, divide the gross amount by 1 + VAT percentage (e.g., for 15% VAT, divide by 1.15). Then, subtract the gross amount, multiply by -1, and round to the closest value (including eurocents). The last two steps are optional as the VAT value is visible beforehand.
Multiply the net amount by 1 + VAT percentage (e.g., multiply by 1.15 for 15% VAT) to get the gross amount. Alternatively, multiply by the VAT percentage to find the VAT value.
For more detailed information, read about VAT tax on Wikipedia.