Drivers argue about fuel, travelers sweat over tips, and the dinner organizer dreads the arithmetic. The math is easy — nobody just writes the formulas down. Here they are.
Fuel: Simple Formula, Careful Data
- Consumption (L/100km) = liters refueled ÷ kilometers driven × 100.
- Measure between two full-to-full fills: note the odometer when the pump clicks off, repeat next fill, compute between the two.
- Reference values: compact cars 7-9 city / 5-6 highway; SUVs 9-12 city. Well above range? Check tire pressure and driving habits first.
Tipping: Different Countries, Different Rules
| Region | Custom | Notes |
|---|---|---|
| USA | 15-20% at restaurants | Service staff rely on tips — basically required |
| Europe | 0-10% | Service often included; round up if happy |
| Japan | None | Tipping can feel insulting |
| SE Asia | Round up | 1-2 USD for hotel porters is fine |
Splitting the Bill: Stop Pressing Calculator Ten Times
Enter the total and headcount and get per-person amounts instantly. For team events with multiple shared expenses, a random grouping tool can shuffle people into balanced teams or split costs so everyone knows exactly who transfers whom.
Recommended Tools
Tip Calculator
Split the bill and calculate tips, totals and per-person amounts in seconds.
Fuel Cost Calculator
Enter distance, fuel used and price to get consumption per 100 km and cost per km.
Random Group Splitter
Shuffle a list of names and split them into balanced random groups.
Free online, images never leave your browser
FAQ
Why is my consumption higher than the official figure?
Official numbers come from ideal test cycles. City driving, idling AC and hard acceleration add up — gentle versus aggressive driving alone can differ by 20%+.
Tip on pre-tax or after-tax?
Pre-tax (the subtotal) is the convention. If a service charge is already on the bill, you don't owe more unless you want to reward exceptional service.