Sales Tax Calculator
Add tax to a net price, or strip it out of a gross one.
How it works
Adding tax is a multiplication; removing it is a division, and getting those the wrong way round is a common and expensive mistake.
To add: net x (1 + rate). To remove: gross / (1 + rate). Subtracting 8.25% from a gross figure does not give the net figure — it undershoots, because the percentage was calculated on the smaller number.