A clear result in a few inputs.
- Enter the requested values.Use consistent units and the real values for your scenario.
- Read the main result and breakdown.NumLuma recalculates immediately when an input changes.
- Check the formula and assumptions.Use the supporting context before making a real-world decision.
What this calculator does
A useful tip calculation should separate the original bill, the gratuity, the final total and the amount each person pays. NumLuma keeps those values visible so a shared bill is easy to check instead of hiding everything behind one total.
What to know before you use the result
- The tip is calculated from the bill amount you enter, before any extra charges you have not included.
- The per-person amount assumes an equal split across the number of people entered.
- Local tipping customs, service charges and taxes can change what is appropriate in a real bill.
Common mistakes to avoid
- Adding a tip on top of a bill that already includes a service charge.
- Splitting only the food subtotal while forgetting tax or other charges.
- Using the number of items instead of the number of people when calculating an equal split.
Where this calculation is useful
Restaurant billsShared mealsDelivery gratuityGroup dining
Related concepts
gratuitytip percentagebill splitper-person total