What it solves
Mental math at the end of a meal is where mistakes happen — especially with tax on the receipt, an uneven split, or friends who want to round up. This calculator handles all three and shows exactly how the numbers were reached, down to the cent.
How to use it
- Type the bill total from the receipt.
- Tap a preset percentage or type your own, and set how many people are splitting.
- Optional: tip on the pre-tax amount, or round each share up to a whole dollar.
How it’s calculated
- Tip = tip base × percentage, where the tip base is the bill, or the bill minus tax if you choose pre-tax.
- Total = bill + tip. Each share = total ÷ people, rounded up to the cent; the last person covers the remainder.
- With round-up, each share rises to the next dollar, the total becomes share × people, and the tip absorbs the difference.
- All math is done in whole cents, so you won’t see floating-point oddities like $15.209999.
Examples
Dinner for two: $84.50 at 18%
Tip $15.21, total $99.71. Split two ways: $49.86 and $49.85.
Tipping before tax: $108.88 including $8.88 tax, 20%
The tip base is $100.00, so the tip is $20.00 and the total is $128.88 (instead of a $21.78 tip on the full amount).
Three friends rounding up: $63.40 at 15%
Each pays $25.00, the total is $75.00 and the tip comes to $11.60 — about 18.3%.
Limitations
- Shares are equal. If people ordered very differently, split items first and use the calculator for each person’s subtotal.
- Amounts are shown in US dollars, but the math works for any currency with cents.