How to Use Vehicle & Bike Calculator
The Vehicle & Bike Calculator is a dual-mode tool for everyday transportation math. Switch between the Car tab and the Bike tab to access the relevant inputs.
Car Mode
- Trip Distance (km) — Enter the one-way or round-trip distance.
- Fuel Consumption (L/100 km) — Use your vehicle's rated or measured consumption. The Vehicle & Bike Calculator uses this to derive total fuel used.
- Fuel Price (/L) — Enter the current local pump price to get a realistic trip cost.
- Travel Time (min) — Optional. When entered, the Vehicle & Bike Calculator also shows average speed.
Bike Mode
- Cadence (rpm) — Your pedaling speed in revolutions per minute. Recreational riders average 60–80 rpm; trained cyclists target 80–100 rpm.
- Chainring Teeth (front) — The number of teeth on your front sprocket.
- Cog Teeth (rear) — The number of teeth on the rear sprocket you are using.
- Wheel Diameter (mm) — The outer diameter of your wheel. The Vehicle & Bike Calculator uses this to compute circumference and distance per revolution.
Results update instantly as you type.
Formula & Theory — Vehicle & Bike Calculator
The Vehicle & Bike Calculator uses standard transport engineering formulas:
Car Formulas
Fuel Used (L) = Distance (km) × Consumption (L/100 km) ÷ 100
Trip Cost = Fuel Used × Fuel Price per Litre
Average Speed (km/h) = Distance (km) ÷ Time (min) × 60
Bike Formulas
Gear Ratio = Chainring Teeth ÷ Cog Teeth
Wheel Circumference (mm) = π × Wheel Diameter (mm)
Speed (km/h) = Cadence (rpm) × Gear Ratio × Circumference (mm) × 60 ÷ 1,000,000
Distance per 100 Revs (m) = Gear Ratio × Circumference (mm) × 100 ÷ 1,000,000 × 1000
| Symbol | Meaning |
|---|---|
| Consumption | Litres of fuel per 100 kilometres |
| Cadence | Pedal revolutions per minute |
| Gear Ratio | Mechanical advantage between front and rear sprockets |
| Circumference | Full outer wheel circumference in millimetres |
The Vehicle & Bike Calculator combines these to give you actionable numbers for planning and training.
Assumptions
The car section does not account for acceleration, idling, or air conditioning. The bike section assumes a rigid drivetrain with no slip. Real-world results vary slightly from these estimates.
Use Cases for Vehicle & Bike Calculator
The Vehicle & Bike Calculator covers a wide range of everyday mobility scenarios:
- Daily commute planning — Enter your commute distance and your car's fuel economy to see the exact daily cost. Use the Vehicle & Bike Calculator monthly to compare driving vs. cycling.
- Road trip budgeting — Calculate total fuel and cost for a long-distance drive so you can budget accurately before departure.
- Cycling training — Cyclists use the Vehicle & Bike Calculator to find the right gear combination for a target speed at a given cadence, helping optimize training intensity.
- Gear ratio comparison — Evaluate multiple front/rear sprocket combinations side by side to choose the best gearing for climbing, sprinting, or all-day touring.
- Average speed tracking — Input your total distance and time to instantly see average speed, useful after a drive or ride when GPS data isn't available.
Whether you commute, tour, or train, the Vehicle & Bike Calculator is a reliable companion for transport math without needing a spreadsheet.