Use this monthly petrol calculator to estimate fuel required and petrol expense from your daily distance, vehicle mileage and local pump price. It supports kilometres, miles, litres, US gallons, Imperial gallons and your selected currency.
Enter a daily distance and the number of days you expect to travel
Vehicle
Region
Trip
Motorcycle / Bike default: 30 km/day at 50 km/L.
Typical bike: 35–65 km/L.
Enter the price shown on your local pump or fuel receipt.
Options
Splits the total cost across riders.
Used directly for the monthly projection.
Formula and example
Monthly distance = daily distance × travel days
Fuel required = monthly distance ÷ mileage in km/L
Monthly petrol cost = fuel required × price per litre
Cost per km = monthly petrol cost ÷ monthly distance
For L/100 km, fuel required = distance × L/100 km ÷ 100. For MPG, distance is converted to miles and divided by US or Imperial MPG. One mile is 1.609344 km; one US gallon is 3.785411784 litres; one Imperial gallon is 4.54609 litres. The two gallon types are not interchangeable.
Petrol cost formula
Cost = (Distance ÷ Mileage) × Price
Use the current pump price in your currency. It is not fetched automatically.
Monthly commute example · 40 km/day
Reference
These profiles are illustrative inputs, not manufacturer claims. Your engine, traffic, load, route and maintenance can change mileage, so use an observed figure from several refills for a more useful monthly estimate.
Detecting your currency — pick one manually if you prefer.
Use the current pump price in your currency. It is not fetched automatically.
Vehicle
km/L| Vehicle | Fuel economy | Fuel / day | Cost / day | Cost / month |
|---|---|---|---|---|
| Light commuter bike | 55–65 | 0.50 L | — | — |
| Standard commuter bike | 45–50 | 0.63 L | — | — |
| Mid-size commuter bike | 45–50 | 0.63 L | — | — |
| Sport commuter bike | 40–45 | 0.71 L | — | — |
| Larger commuter bike | 38–42 | 0.75 L | — | — |
| Light city scooter | 50–55 | 0.57 L | — | — |
| Comfort scooter | 42–48 | 0.67 L | — | — |
| Urban scooter | 48–52 | 0.60 L | — | — |
| Compact hatchback | 18–22 | 1.50 L | — | — |
| Small family car | 14–17 | 1.94 L | — | — |
| Mid-size sedan | 12–15 | 2.22 L | — | — |
| Compact sedan | 13–16 | 2.07 L | — | — |
| Large sedan | 11–13 | 2.50 L | — | — |
| Large SUV | 8–10 | 3.33 L | — | — |
| Pickup truck | 9–12 | 2.86 L | — | — |
| Compact SUV | 12–14 | 2.31 L | — | — |
Based on a 30 km trip using the midpoint of each economy range. Add a petrol price to see daily and monthly cost.
Fuel-use comparison
A 30 km daily distance across 30 days, compared without assuming a fuel price.
30 days × 30 kmEstimated fuel required for 900 km. Lower bars indicate less fuel used.
How to use it
Enter the distance you normally travel in one day, choose kilometres or miles, select the vehicle and enter its real fuel efficiency. Add the petrol price in the matching litre or gallon unit, then enter the number of days you expect to travel this month. The result shows daily fuel use, your selected monthly projection, annual context and cost per distance unit.
Count only days that match the daily route you entered. Keep commuting, weekend errands and occasional journeys separate when their daily distances differ.
Calculate each vehicle separately, then add the results for one monthly household total.
Enter the actual days you expect to commute this month.
Re-enter your pump price whenever it changes instead of relying on a stale average.
Budget guide
A calendar-month projection assumes the same entered distance on all 30 days. A commute budget should instead use the actual workdays for that month after weekends, leave, public holidays and remote-work days. If weekend travel follows a different pattern, calculate it separately and add it. This avoids treating an occasional trip as a repeated daily journey.
Monthly distance and petrol price have a direct effect, while real fuel efficiency reflects traffic, road gradient, short cold-engine journeys, long idling, speed, rapid acceleration, braking, vehicle load, towing, tyre pressure, air-filter condition, engine maintenance, weather and fuel quality. Record odometer distance and litres added across several full refills to get a more representative mileage input.
Save the estimate at the start of the month and compare it with receipts at month-end. If actual expense differs, check distance, travel days, pump price and measured mileage before changing the budget. Practical ways to reduce unnecessary fuel use include combining nearby errands, avoiding avoidable idling, maintaining recommended tyre pressure, removing unnecessary load and using smooth acceleration where conditions allow. No fixed saving is guaranteed.
The estimate assumes the entered mileage and fuel price remain constant. It cannot predict traffic, detours, seasonal price changes, odometer error, leaks or changes in vehicle condition. Currency is a calculation label and is not converted. This page is specifically for a recurring monthly petrol budget; use the daily commute calculator for one-day commuting detail and the trip petrol calculator for a particular one-way or return journey. For year-specific schedules, use the annual petrol calculator rather than duplicating this monthly estimate.
Calculations use full precision internally and round displayed fuel and cost values for readability. The user controls distance, mileage and petrol price; no live fuel-price or exchange-rate service is used. Review the calculation methodology for formulas, unit handling and assumptions. Last reviewed: 17 September 2026.
FAQ
Answers about travel days, monthly projections, real mileage, units and fuel-budget scope.
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Review your estimate
Enter real mileage, the current pump price, a representative daily distance and your expected travel days. Recalculate whenever the schedule or price changes.