Ecology & Environment

Instant, private, and free

PHEV Economy Calculator.

Calculate weighted fuel and electricity consumption from an explicit electric-driving share.

On-device calculationNo signup
01

Set your values

Results update as you type.

Electric share: 60 %

Electric share

60.000000%
Fuel share: 40 %

Fuel share

40.000000%
Weighted electric consumption: 10.8 kWh/100 km

Weighted electric consumption

10.800000kWh/100 km
Weighted fuel consumption: 2.4 L/100 km

Weighted fuel consumption

2.400000L/100 km

Results update automatically as you type.

Use Cases

Estimate daily commuting costs

Determine how much electricity and fuel you use for your typical commute by adjusting the electric share to match your driving habits.

Example: If you drive 50% electric, 20 kWh/100 km, and 5 L/100 km, see combined consumption.

Compare PHEV efficiency

Use the calculator to compare different plug-in hybrids by inputting their official consumption figures and a common electric share.

Example: Compare two models with different electric ranges and fuel economy.

Frequently Asked Questions

How does the PHEV Economy Calculator work?
It calculates the weighted average of electricity and fuel consumption based on the electric driving share. You input the fraction of driving done in electric mode, the electric consumption in kWh/100 km, and the fuel consumption in L/100 km. The calculator then combines these to show overall energy use.
What is the electric driving share?
It's the fraction of total distance driven using electric power. For example, if you drive 60% of your trips in electric mode, you enter 0.6. This affects the weighted consumption: higher electric share means more electricity and less fuel used.
Can I use this calculator for any plug-in hybrid?
Yes, as long as you know the vehicle's electric consumption (kWh/100 km) and fuel consumption (L/100 km) in hybrid mode. The calculator is generic and works for any PHEV, but results depend on your actual driving patterns.

Tips & Common Mistakes

Tips

  • Use your vehicle's real-world consumption figures for more accurate results, not just official ratings.
  • Adjust the electric share based on your actual driving patterns, such as city vs. highway.
  • Remember that electricity consumption is in kWh/100 km and fuel in L/100 km; keep units consistent.
  • Use the result to estimate energy costs by multiplying by your electricity rate and fuel price.

Common Mistakes to Avoid

  • Entering the electric share as a percentage (e.g., 50) instead of a fraction (0.5).
  • Using inconsistent units, such as miles instead of km, which will skew the weighted calculation.
  • Assuming the calculator accounts for regenerative braking or other factors; it only uses the inputs you provide.

Last updated: August 13, 2026