Tip Calculator

How This Calculator Works

A tip amount is the bill multiplied by the tip percentage you choose to leave. Enter the pre-tip bill amount, the tip percentage you want to leave, and how many people are splitting the check. The calculator shows the tip amount, the total bill including tip, and (if you’re splitting) exactly how much each person owes — no mental math, no rounding errors, no disagreements at the table about who owes what.

Under “More options,” you can also enter sales tax and choose whether the tip is calculated on the pre-tax amount or the post-tax total, and turn on rounding the total up to a whole number for a cleaner amount to hand over.

The Formula

Three straightforward steps, with every quantity color-coded and carried through consistently:

$$\vC{\text{Tip Amount}} = \vA{\text{Bill}} \times \left(\frac{\vB{\text{Tip Percent}}}{100}\right)$$ $$\vD{\text{Total Bill}} = \vA{\text{Bill}} + \vC{\text{Tip Amount}}$$ $$\vF{\text{Per-Person Amount}} = \vD{\text{Total Bill}} \div \vE{\text{Number of People}}$$

If only one person is paying, the per-person amount is just the total bill — dividing by 1 doesn’t change anything.

When you enter sales tax, most point-of-sale systems suggest a tip on the post-tax total by default — that’s this calculator’s default too, but you can switch to tipping on the pre-tax amount instead, which is what many etiquette guides actually recommend (since tax isn’t service). When splitting, each person’s share is rounded up to the nearest cent, so the group always collectively covers the full total — never a fraction of a cent short.

Worked Example

A group of four people has a $100 bill and wants to leave a 15% tip.

1. Tip Amount: $\vA{100} \times (\vB{15} \div 100) = \vC{15}$.
2. Total Bill: $\vA{100} + \vC{15} = \vD{115}$.
3. Per-Person Amount: $\vD{115} \div \vE{4} = \vF{28.75}$.

Each person owes $28.75. If the same group decided on 20% instead, the tip would be $20, the total $120, and each person’s share $30 — small percentage differences add up once they’re split across a real total.

Common Mistakes

• Tipping on the post-tax total without meaning to. Some diners intend to tip on the pre-tax subtotal specifically — check which base this calculator’s “tip on pre-tax” toggle is set to if your own math doesn’t match a receipt.
• Double-tipping when a service charge is already included. Some restaurants (especially for large parties) add an automatic gratuity to the bill — adding another tip on top pays twice for the same service.
• Splitting the tip unevenly without meaning to. Dividing a total bill evenly assumes everyone ordered a similar amount — for a group with very different orders, splitting each person’s own subtotal and tipping on that is more accurate than one even split.