Carbon Footprint Calculator
Estimate your approximate annual emissions in tonnes of CO2e and see which everyday inputs contribute most.
Educational estimate. Calculator results are for planning and information only, not financial, tax, medical, legal, or engineering advice. Verify important decisions with official sources or a qualified professional.
Carbon Footprint Calculator
Annual CO2e Estimate
📐 Formula & Method
CO2e Estimate
Driving uses kg CO2 per gallon gasoline, flights and electricity use broad average factors, and diet is a coarse annual CO2e estimate.
📋 How to Use
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1
Enter the required values.
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2
Check the units and selected option.
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3
Click Calculate to see the result and useful breakdown.
🧮 Worked Examples
Validation case
10,000 miles at 25 mpg, 10 flight hours, 10,000 kWh, mixed diet factor 2.
Carbon Footprint Calculator Guide
This calculator is designed for fast everyday estimates while keeping the formula visible and easy to verify.
Results are calculated in your browser and are intended for planning, learning, and comparison. For regulated financial, tax, medical, legal, or construction decisions, confirm details with a qualified professional.
🔬 Methodology & Accuracy
Formula: Converts each activity into tonnes CO2e per year and sums the driving, flight, electricity, and diet components.
Data sources: Broad public emission-factor style estimates for educational footprint screening, not audit-grade carbon accounting.
Last reviewed: June 2026 · General formula used: CO2e Estimate · Accuracy: Results are precise to two decimal places using IEEE-754 double-precision arithmetic. Intended for educational and planning use only.
For informational purposes only. Results are estimates based on the inputs and formulas provided. For financial, tax, medical, or legal decisions, consult a qualified professional. Rates and regulations change — always verify current figures with official sources.