What does this calculator need?

Annual (or best-estimate) activity data like electricity kWh, gas use, car distance and efficiency, number of flights, rail/bus distance, diet pattern, and optional annual spending. You can adjust all emission factors.

Operational CO₂e from home energy; passenger transport (car, rail, bus, flights—with optional radiative forcing uplift); diet pattern as a daily average; and a consumption proxy from annual spend. All factors are editable to match your sources.

No. Everything runs locally in your browser.

Carbon Footprint Calculator — Home Energy, Travel, Diet & Consumption

Friendly estimates for planning and awareness. Private by design — runs locally in your browser.

Inputs (annual, per person)

🏠 Home Energy

Electricity (kWh/year) Grid intensity (kg CO₂/kWh) Household size

Natural gas amount Gas units Gas factor (kg CO₂/kWh) Upstream methane uplift (%)

Other fuels (optional)

Heating oil (L/year) Oil factor (kg CO₂/L) LPG/Propane (kg/year) LPG factor (kg CO₂/kg)

If energy bills are for the whole household, set Household size to split per-person emissions.

🚗✈️ Travel

Car

Distance (per year) Units Type

Consumption Units Fuel factor (kg CO₂/L) Occupants

Flights

Short-haul flights (one-way) Medium-haul (one-way) Long-haul (one-way) Radiative forcing uplift (%)

Rail & Bus (optional)

Rail distance (km/year) Rail factor (kg CO₂/pkm) Bus distance (km/year) Bus factor (kg CO₂/pkm)

Flights are counted per one-way leg. Uplift % optionally adds non-CO₂ effects.

🍽️ Diet

Diet pattern Diet factor (kg CO₂e/day) Days/year

Simple average for food & drink. Choose a preset, then tweak the daily factor if you have better data.

🛍️ Goods & Services

Annual spend (exclude energy/travel) Currency label Intensity (kg CO₂e per currency unit)

A coarse proxy for purchases & services. Adjust the intensity to match your preferred source.

Advanced options (optional)

Miles ↔︎ km (km per mile) Therm → kWh Natural gas m³ → kWh Flight factors (kg CO₂e/passenger-km)

Use these to mirror a report or dataset. All numbers are editable.

Friendly estimate only. Real-world footprints vary with climate, housing, driving style, vehicle occupancy, route, food sourcing, and purchasing mix.

Results

What’s Being Calculated?

Home energy: Electricity kWh × grid kg/kWh; gas kWh × gas kg/kWh (optional methane uplift); heating oil and LPG via simple factors. If bills are household totals, divide by household size.
Travel: Car distance × consumption × fuel/grid factor ÷ occupants; flights via passenger-km factors (optional radiative forcing %); optional rail/bus passenger-km.
Diet: Average daily kg CO₂e × days/year (choose a preset and adjust).
Consumption: Annual spend × intensity (kg CO₂e per currency). A coarse proxy—tune to your source.

Limitations

Awareness-level estimator, not an audit. Supply chains and local factors vary widely.
Flight non-CO₂ effects are uncertain; the uplift % is optional and editable.