Free · Everyday planning calculators

Shared Trip Fuel Budget

Estimate fuel and shared trip costs from a measured custom consumption rate.

  • Formula & worked example
  • Private in your browser
  • No signup
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Calculator inputs

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How to use this calculator

  1. Enter the known values in the units shown. Results update as you type.
  2. Where results are editable, change one to solve backwards. Lock a value to hold it fixed.
  3. Use the worked example to check the method. Reset restores the starting fields.

Private by default

Inputs and results stay in this browser tab. Bookify does not upload or store the values you enter.

Formula and method

A 300 km trip at 10 L/100 km uses 30 liters; $2 per liter split by two people is $30 each.

Fuel = distance × liters per 100 km / 100; per-person cost = fuel price × fuel / people

Worked example

Enter these known values and leave the other values blank.

Trip type
Custom
Car
Other vehicle
Fuel economy
10 L/100 km
Distance
300 km
Fuel price
2 USD / L
Number of people
2
Fuel used
30 L
Cost of the trip
60 USD
Cost per person
30 USD
Net CO₂
70.5 kg

Assumptions and limitations

  • The custom example uses measured liters per 100 km. Named-vehicle presets are captured values, not current model-year specifications. CO2 uses captured approximate gasoline/diesel factors; tree equivalents are fixed bookkeeping comparisons, not a claim that planting trees offsets this trip.

Common questions

What assumptions affect this result?

The custom example uses measured liters per 100 km. Named-vehicle presets are captured values, not current model-year specifications. CO2 uses captured approximate gasoline/diesel factors; tree equivalents are fixed bookkeeping comparisons, not a claim that planting trees offsets this trip.

Can I solve for a missing value?

Clear the missing field and enter compatible known values in the displayed units. Supported inverse branches remain available; rounding and one-way outputs keep their original direction.

References

Require a whole passenger count while preserving the captured positive sharing bound.

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