エコロジー計算機

Understand your environmental footprint — carbon, energy, water, solar and composting math in one place.

運転カーボンフットプリント計算機

Distance (km) Fuel efficiency (km per litre)

Estimate the CO2 emissions of a car journey from distance and fuel economy.

CO2 to offset (kg/year)

Find how many trees it takes to absorb a given amount of CO2 each year.

Roof area (m²) Rainfall (mm)

Estimate how much rainwater a roof can collect from its area and the rainfall.

Old bulb (W) New LED (W) Hours per day Price per kWh

See the yearly energy and money you save by switching a bulb to LED.

Sheets of paper saved

Translate paper you avoid printing into trees and CO2 saved.

Flight distance (km) Passengers

Estimate the carbon emissions of a flight per passenger and in total.

System size (kWp) Peak sun hours per day Price per kWh (optional)

Estimate the yearly electricity and value a solar array produces where you live.

Brown material (parts) Green material (parts)

Balance your compost pile toward the ideal carbon-to-nitrogen ratio of about 30:1.