Tip from Net Price Calculator
Find a tip based on the pre-tax (net) price.
Tip fairly by calculating it on the pre-tax price rather than the taxed total.
The math behind it
First strip the tax: net = total / (1 + tax%). Then tip = net x tip%.
Worked example
$66 total at 10% tax has a $60 net; an 18% tip is $10.80.
FAQ
Why tip on net?
Tax isn't part of the service, so tipping on the pre-tax amount is common.