Estimate your company’s yearly emissions in six steps, using published EPA emission factors. Enter yearly totals; leave anything you don’t know at zero. Just you? Try the personal calculator.
Factor: 0.350 kg CO₂/kWh, the U.S. average from EPA eGRID2023 (771.5 lb/MWh). Find kWh on your utility bills.
Factor: 5.31 kg CO₂/therm (53.06 kg CO₂/MMBtu), EPA GHG Emission Factors Hub.
Factors: gasoline 8.887 kg CO₂/gal (EPA); diesel 10.21 kg CO₂/gal (EPA Emission Factors Hub).
Per passenger-mile: short 0.207, medium 0.129, long 0.163 kg CO₂ (EPA Hub, business travel). Assumed one-way distances: 200, 1,000 and 4,000 miles. Car miles use 25 mpg and the EPA gasoline factor.
Drive-alone miles ÷ mpg × 8.887 kg CO₂/gal (EPA). Transit, biking and remote days are counted as zero here, so this is a simplification.
Get reported figures from AWS Customer Carbon Footprint Tool, Google Cloud Carbon Footprint or Microsoft Emissions Impact Dashboard. kWh uses the eGRID factor. We don’t convert dollars of spend, because there’s no reliable published factor we’d stand behind.
Estimate · prototype
1 carbon credit = 1 tCO₂e, so covering this year would take about 0 credits. Offset checkout is a prototype and sells nothing yet. See the example flow.
It estimates Scope 1 (natural gas burned on site and fuel in company vehicles), Scope 2 (purchased electricity) and the parts of Scope 3 most small businesses can measure easily: business travel and employee commuting, plus optional cloud computing. Scopes follow the GHG Protocol Corporate Standard.
It is a screening estimate, not an audited inventory. It uses U.S. average emission factors from the EPA, so your real number will differ with your utility, vehicles and travel. Use it to see where your biggest sources are.
Electricity (kWh) and natural gas (therms) are on your utility bills. Fuel gallons are on fuel-card or expense reports. Flight counts come from travel bookings. For cloud, AWS, Google Cloud and Azure each offer a free carbon footprint dashboard.
Dollar-based factors for cloud services vary widely and go stale fast, so we don’t guess. Enter the emissions your provider reports, or the electricity in kWh if you know it.
Not yet. Checkout on carboncredit.earth is a prototype and no real credits are sold. See our individual calculator for the example flow.