Tip Calculator

Tipping calculations seem trivial until you're standing at a restaurant table trying to work out 18% of £73.40 in your head while splitting it four ways — which is exactly the everyday problem this calculator solves. The math itself is simple, but doing it quickly and correctly, especially under the mild social pressure of a group waiting to settle a bill, is where people commonly make small errors that add up. The core calculation has three steps. First, the tip amount is the bill multiplied by the tip percentage, divided by 100 — a £60 bill with an 18% tip gives a tip amount of £10.80. Second, the total is the bill plus the tip amount — £60 + £10.80 = £70.80. Third, if the bill is being split among a group, the per-person amount is the total divided by the number of people — split four ways, that's £70.80 ÷ 4 = £17.70 each. Tipping norms vary considerably by country and context, which is why this calculator offers quick-select buttons for common percentages (10%, 15%, 18%, 20%, 25%) rather than assuming a single "correct" rate. In the US, 18-20% has become the broadly expected standard for full-service restaurant dining, with 15% sometimes considered on the low side and 25%+ reserved for exceptional service. In the UK, 10-12.5% is more typical, and many restaurants already add a discretionary service charge to the bill, in which case an additional tip may not be expected at all. Being able to quickly switch between these common percentages, rather than needing to type a custom number every time, matches how tipping decisions actually get made at the table. A worked example that shows why "split the tip" and "split the bill including tip" can trip people up: a group of five orders a total bill of £142.50 and decides on a 20% tip. The tip amount is £142.50 × 0.20 = £28.50, making the total £171.00. Splitting five ways gives £34.20 per person. A common mistake is to calculate the per-person share of the original bill first (£142.50 ÷ 5 = £28.50) and then add a flat 20% to that per-person figure separately (£28.50 × 1.20 = £34.20) — in this particular case the numbers happen to match because tip percentage distributes evenly across an even split, but the two approaches only agree because everyone is paying an identical share; the moment people want to split unevenly (say, based on what each person actually ordered), calculating the tip on the whole bill first and then dividing the total is the only approach that stays consistent. A related misconception is that a lower headline tip percentage always means a smaller absolute tip — this only holds if the bill size is held constant. A 15% tip on a $200 bill ($30) is larger in absolute terms than a 25% tip on a $100 bill ($25), which matters when comparing your tipping generosity across visits to restaurants of very different price points rather than assuming the percentage alone tells the whole story.