Calculate annual carbon footprint from electricity, gas, and driving.
Carbon Footprint Calculator
Carbon Footprint
CO₂ from energy + transport
kWh/mo
therms/mo
mi/yr
Annual CO₂
7620kg
CO₂ Breakdown
About this calculator
What is the Carbon Footprint Calculator?
Carbon Footprint Calculator calculate annual carbon footprint from electricity, gas, and driving. It is part of Home of Calculators's Environment Calculators suite for carbon footprint, energy savings, and sustainability metrics. The calculator is designed for environmentalists, homeowners, conscious consumers, but anyone can use it. No signup, no ads, no tracking. Just accurate math, computed locally in your browser using a BigNumber-precision math engine.
Formula Reference
The Formula
CO₂ = Electricity×0.4×12 + Gas×2.3×12 + Miles×0.4
Your carbon footprint is the total greenhouse gas emissions caused by your activities. Electricity usage, natural gas consumption, and driving are the three largest contributors for most households.
Variables
ElectricityMonthly kWh (kWh)GasMonthly therms (therms)MilesAnnual miles driven (mi)Worked Example
Electricity = 300Gas = 50Miles = 12000
Result: ~5,520 kg CO₂/yr
How to use the Carbon Footprint Calculator
- 1
Gather your usage data
Find your monthly electricity (kWh), gas (therms), and annual driving miles.
- 2
Calculate electricity emissions
Multiply kWh by 0.4 kg CO₂/kWh, then by 12 months.
- 3
Calculate gas emissions
Multiply therms by 2.3 kg CO₂/therm, then by 12 months.
- 4
Calculate driving emissions
Multiply miles by 0.4 kg CO₂/mile.
- 5
Sum all sources
Add all three to get your annual CO₂ emissions in kg.
Quick tips
- All calculations run locally in your browser; your data never leaves your device.
- For best results on mobile, rotate to landscape when entering many values.
- Bookmark this page to come back to your calculation anytime.
- Need a different calculator? Try our visual builder to create your own.
Why Home of Calculators
- 100% private (calculations run in your browser)
- 128-bit BigNumber precision (no rounding errors)
- Works on any device: phone, tablet, desktop
- Free forever (no signup, no ads, no upsells)
Frequently asked questions
Is the CO₂ Footprint accurate?
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Yes. Home of Calculators uses a BigNumber-precision math engine (64-128 decimal digits) to ensure calculations are accurate. We run 96+ automated tests covering unit conversion, financial formulas, health formulas, and more. For critical decisions (financial, medical, legal), we still recommend consulting a qualified professional.
Is the Carbon Footprint Calculator free?
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Yes. Every calculator on Home of Calculators is 100% free, with no signup, no ads, and no hidden fees. The entire platform is free forever.
Do you store the values I enter?
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No. All calculations happen in your browser. We never see, store, or transmit your inputs to any server. Your data stays on your device.
Can I use the CO₂ Footprint on my phone?
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Yes. Home of Calculators is fully responsive and works on any device (phone, tablet, laptop, or desktop). The interface adapts to your screen size.
Can I embed this calculator on my own website?
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Yes. Click the "Share" button to get an iframe embed code. The embedded calculator will look like any other Home of Calculators widget. You can also build a fully customized version using our visual builder.
Can I build my own custom calculator?
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Absolutely. Home of Calculators's visual builder lets you add fields, write formulas, choose a theme, and brand the result with your own logo, all without writing code.