Carbon Footprint Calculator
ANA›Life Services Authority›National Calculator Authority›Carbon Footprint Calculator
.calc-container { max-width: 640px; margin: 2rem 0; padding: 1.5rem; background: #fff; border: 1px solid #ddd; border-radius: 8px; box-shadow: 0 1px 3px rgba(0,0,0,0.06); font-family: system-ui, -apple-system, sans-serif; } .calc-container h3 { font-family: Georgia, serif; font-size: 1.15rem; color: #1a1a1a; margin-bottom: 1rem; padding-bottom: 0.5rem; border-bottom: 2px solid var(--ac, #3d5a80); } .calc-row { display: flex; align-items: center; gap: 0.75rem; margin-bottom: 0.75rem; flex-wrap: wrap; } .calc-row label { min-width: 160px; font-size: 0.9rem; color: #333; font-weight: 500; } .calc-row input[type="number"], .calc-row select { flex: 1; min-width: 120px; max-width: 200px; padding: 0.5rem 0.6rem; border: 1px solid #ccc; border-radius: 4px; font-size: 0.9rem; font-family: system-ui, sans-serif; color: #1a1a1a; background: #fafaf8; } .calc-row input:focus, .calc-row select:focus { outline: none; border-color: var(--ac, #3d5a80); box-shadow: 0 0 0 2px rgba(26,74,138,0.12); } .calc-row .unit { font-size: 0.82rem; color: #888; min-width: 30px; } .calc-btn { display: inline-block; margin-top: 0.5rem; padding: 0.55rem 1.5rem; background: var(--ac, #3d5a80); color: #fff; border: none; border-radius: 4px; font-size: 0.9rem; font-weight: 600; cursor: pointer; font-family: system-ui, sans-serif; } .calc-btn:hover { opacity: 0.9; } .calc-result { margin-top: 1.25rem; padding: 1rem 1.25rem; background: #f0f6fc; border-left: 3px solid var(--ac, #3d5a80); border-radius: 0 6px 6px 0; display: none; } .calc-result.visible { display: block; } .calc-result-label { font-size: 0.78rem; text-transform: uppercase; letter-spacing: 0.06em; color: #666; margin-bottom: 0.25rem; } .calc-result-value { font-size: 1.6rem; font-weight: 700; color: var(--ac, #3d5a80); } .calc-result-detail { font-size: 0.85rem; color: #555; margin-top: 0.5rem; line-height: 1.5; } .calc-note { margin-top: 1rem; font-size: 0.8rem; color: #888; font-style: italic; } .calc-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 0.75rem; margin-top: 0.75rem; } .calc-grid-item { padding: 0.6rem 0.8rem; background: #f8f9fa; border-radius: 4px; border: 1px solid #eee; } .calc-grid-item .label { font-size: 0.75rem; color: #888; text-transform: uppercase; letter-spacing: 0.04em; } .calc-grid-item .value { font-size: 1.1rem; font-weight: 600; color: #1a1a1a; } @media (max-width: 720px) { .calc-row { flex-direction: column; align-items: flex-start; gap: 0.3rem; } .calc-row label { min-width: auto; } .calc-row input[type="number"], .calc-row select { max-width: 100%; width: 100%; } .calc-grid { grid-template-columns: 1fr; } } .calc-chart { margin: 1rem 0; text-align: center; } .calc-chart svg { max-width: 100%; height: auto; } .calc-chart-legend { display: flex; flex-wrap: wrap; justify-content: center; gap: 0.6rem 1.2rem; margin-top: 0.6rem; font-size: 0.8rem; color: #555; } .calc-chart-legend span { display: inline-flex; align-items: center; gap: 0.3rem; } .calc-chart-legend i { display: inline-block; width: 10px; height: 10px; border-radius: 2px; font-style: normal; } .calc-related { max-width: 640px; margin: 2rem 0 1rem; padding: 1.25rem 1.5rem; background: #f8f9fa; border: 1px solid #e8e8e8; border-radius: 8px; } .calc-related h3 { font-family: Georgia, serif; font-size: 1rem; color: #1a1a1a; margin: 0 0 0.75rem; padding-bottom: 0.4rem; border-bottom: 2px solid var(--ac, #3d5a80); } .calc-related-list { list-style: none; padding: 0; margin: 0 0 0.75rem; display: grid; grid-template-columns: 1fr 1fr; gap: 0.4rem 1.5rem; } .calc-related-list li a { font-size: 0.88rem; color: var(--ac, #3d5a80); text-decoration: none; } .calc-related-list li a:hover { text-decoration: underline; } .calc-browse-all { margin: 0.5rem 0 0; font-size: 0.9rem; font-weight: 600; } .calc-browse-all a { color: var(--ac, #3d5a80); text-decoration: none; } .calc-browse-all a:hover { text-decoration: underline; } @media (max-width: 720px) { .calc-related-list { grid-template-columns: 1fr; } }
Carbon Footprint Calculator
Estimate your annual carbon footprint (in kg CO₂e) based on home energy use, vehicle travel, and diet.
Monthly Electricity Use (kWh)
Monthly Natural Gas Use (therms)
Monthly Fuel Oil Use (gallons)
Miles Driven per Year (car)
Vehicle Fuel Efficiency (MPG)
Short-Haul Flights per Year (<3 hrs)
Long-Haul Flights per Year (≥3 hrs)
Diet Type
Meat-heavy (>100g meat/day) Average omnivore (~50g meat/day) Low-meat / pescatarian Vegetarian Vegan
Calculate
function carCalc() { var resultDiv = document.getElementById('car-result');
// --- Read inputs --- var electricity = parseFloat(document.getElementById('car-electricity').value); var naturalGas = parseFloat(document.getElementById('car-natural-gas').value); var fuelOil = parseFloat(document.getElementById('car-fuel-oil').value); var miles = parseFloat(document.getElementById('car-miles').value); var mpg = parseFloat(document.getElementById('car-mpg').value); var flightsShort = parseFloat(document.getElementById('car-flights-short').value); var flightsLong = parseFloat(document.getElementById('car-flights-long').value); var dietKg = parseFloat(document.getElementById('car-diet').value);
// --- Validation --- var errors = []; if (isNaN(electricity) || electricity 0) { resultDiv.innerHTML = '' + errors.join('') + ''; return; }
// --- Emission Factors --- // Electricity: US average 0.386 kg CO2e/kWh (EPA eGRID 2022 national average) var EF_ELECTRICITY = 0.386; // kg CO2e per kWh // Natural gas: 5.302 kg CO2e per therm (EPA) var EF_NATURAL_GAS = 5.302; // kg CO2e per therm // Fuel oil: 10.16 kg CO2e per gallon (EPA) var EF_FUEL_OIL = 10.16; // kg CO2e per gallon // Gasoline: 8.887 kg CO2e per gallon (EPA) var EF_GASOLINE = 8.887; // kg CO2e per gallon // Short-haul flight: 255 kg CO2e per round trip (DEFRA 2023, economy, RFI 1.9x) var EF_FLIGHT_SHORT = 255; // kg CO2e per flight (one-way avg ~1.5 hrs) // Long-haul flight: 1,620 kg CO2e per round trip (DEFRA 2023, economy, RFI 1.9x) var EF_FLIGHT_LONG = 1620; // kg CO2e per flight (one-way avg ~8 hrs)
// --- Calculations --- // Home energy (annualise monthly figures × 12) var co2Electricity = electricity * 12 * EF_ELECTRICITY; var co2NaturalGas = naturalGas * 12 * EF_NATURAL_GAS; var co2FuelOil = fuelOil * 12 * EF_FUEL_OIL;
// Vehicle: gallons = miles / mpg; CO2 = gallons × EF_GASOLINE var gallons = miles / mpg; var co2Vehicle = gallons * EF_GASOLINE;
// Flights var co2Flights = (flightsShort * EF_FLIGHT_SHORT) + (flightsLong * EF_FLIGHT_LONG);
// Diet (annual kg CO2e already stored in select value) var co2Diet = dietKg;
// Total var total = co2Electricity + co2NaturalGas + co2FuelOil + co2Vehicle + co2Flights + co2Diet; var totalTonnes = (total / 1000).toFixed(2);
// --- Comparison context --- // Global average ~4,700 kg; US average ~14,000 kg (Our World in Data 2022) var context = ""; if (total ' + '' + total.toFixed(0) + ' kg CO₂e' + ' (' + totalTonnes + ' tonnes CO₂e)' + '' + 'Categorykg CO₂e/yrShare' + row("Electricity", co2Electricity, total) + row("Natural Gas", co2NaturalGas, total) + row("Fuel Oil", co2FuelOil, total) + row("Vehicle", co2Vehicle, total) + row("Flights", co2Flights, total) + row("Diet", co2Diet, total) + '' + '' + context + ''; }
function row(label, value, total) { var pct = total > 0 ? (value / total * 100).toFixed(1) : "0.0"; return '' + label + '' + '' + value.toFixed(0) + '' + '' + pct + '%'; }
#### Formulas Used
Electricity: kWh/month × 12 × 0.386 kg CO₂e/kWh Natural Gas: therms/month × 12 × 5.302 kg CO₂e/therm Fuel Oil: gallons/month × 12 × 10.16 kg CO₂e/gallon Vehicle: (miles/year ÷ MPG) × 8.887 kg CO₂e/gallon Flights: (short flights × 255) + (long flights × 1,620) kg CO₂e Diet: annual kg CO₂e based on diet type Total: Sum of all categories
#### Assumptions & References
- Electricity emission factor: 0.386 kg CO₂e/kWh — US national average (EPA eGRID 2022).
- Natural gas: 5.302 kg CO₂e/therm — EPA Emission Factors for Greenhouse Gas Inventories (2023).
- Fuel oil: 10.16 kg CO₂e/gallon — EPA (2023).
- Gasoline: 8.887 kg CO₂e/gallon — EPA (2023).
- Short-haul flight (<3 hrs): 255 kg CO₂e per flight — DEFRA 2023 aviation factors, economy class, radiative forcing index (RFI) of 1.9 applied.
- Long-haul flight (≥3 hrs): 1,620 kg CO₂e per flight — DEFRA 2023, economy class, RFI 1.9.
- Diet CO₂e values sourced from Poore & Nemecek (2018), Science, and Oxford University Food & Climate Research.
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