Bill Split with Tax Calculator

How it is calculated

Tax is added to the pre-tax subtotal, the tip is calculated on that same pre-tax subtotal (not on the tax-inclusive price), and the grand total is divided equally among the people.

tip = subtotal × tip% ÷ 100, total = subtotal × (1 + tax% ÷ 100) + tip, per person = total ÷ people

The subtotal is the bill amount before tax. Tax and tip are percentages, not amounts. Subtotal, tax and tip can be zero but not negative. The number of people must be a whole number of at least 1; 0, a fraction such as 2.5, or a negative subtotal gives no result. Amounts are displayed with a dollar sign and 2 decimals, which is only a display symbol: the arithmetic works the same for any currency. The split is always equal, so it does not account for who ordered what.

Common mistakes

• Entering the amount that already includes tax as the subtotal. The tax would be added a second time and the tip would be calculated on a larger base.
• Typing the tip as an amount (25) instead of a percentage (18). The field is a percent, so 25 means 25 % of the subtotal.
• Entering the tax rate as 0.08 instead of 8. The field is in percent, and 0.08 means 0.08 %.
• Expecting the tip to be based on the tax-inclusive total. Here the tip uses the pre-tax subtotal only, so the result is lower than a tip on the full total.
• Entering a fractional number of people, such as 2.5. The tool shows no result, because a real group cannot have half a person; use a whole number.