About this tool
Settle a USD bill with visible tip-base, rounding, and share-allocation policies instead of hiding fractional-cent adjustments.
Tip Calculator is useful when a bill needs a quick tipping decision that also accounts for splitting, rounding, or tax-aware totals. It helps with restaurant checks, group payments, and everyday calculations where you want the final number without doing mental math at the table.
- Parses bill and tax directly into integer cents and rounds a tip rate with up to three decimal places using exact BigInt half-up arithmetic.
- Supports exact cents, round-up-to-dollar, and nearest-dollar total policies; nearest-dollar mode never lowers payment below bill plus tax.
- Allocates equal or validated weighted shares with a stable largest-remainder method so every displayed person amount sums exactly to the displayed total.
How to use Tip Calculator
Enter the bill amount, choose the tip percentage, and review the total plus per-person split before paying. If the group wants a clean number, try the rounding options so the final amount is easier to divide or settle in a payment app.
When this tool is useful
- Parses bill and tax directly into integer cents and rounds a tip rate with up to three decimal places using exact BigInt half-up arithmetic.
- Supports exact cents, round-up-to-dollar, and nearest-dollar total policies; nearest-dollar mode never lowers payment below bill plus tax.
- Allocates equal or validated weighted shares with a stable largest-remainder method so every displayed person amount sums exactly to the displayed total.
Examples you can test
Load an example, compare the result with the expected output, then replace it with your own input.
Split a restaurant bill
Example input
Bill: 64.80, tip: 20%, people: 3
Expected output
Total: 77.76, per person: 25.92
Use this when each person is splitting the same total, including tip.
Compare tip rates
Example input
Bill: 42.50, tip options: 15%, 18%, 20%
Expected output
Tips: 6.38, 7.65, 8.50
Comparing common rates helps choose a final amount without mental math at the table.
Validation checklist
- Check whether tax should be included in the base amount for your situation.
- Confirm the number of people before using the per-person amount.
- Review rounding when paying with cash or splitting through a payment app.
- Confirm whether service charges are already included before adding a separate tip.
- Use the same bill amount for everyone when comparing per-person totals.