Our CO₂ savings calculator uses real gas-price and electricity rate defaults based on your ZIP code (or state) and allows you to override them. The tool applies the standard CO₂ emissions factor of 8.887 kg CO₂ per gallon of gasoline, and a grid emissions factor (0.417 kg CO₂/kWh). You can further increase accuracy by entering your actual Wh/mi, MPG, and utility rates.

We use the standard EPA factor: 8.887 kg CO₂ per gallon of gasoline burned. That means if your monthly car use is 30 gallons, you’d emit around 266.6 kg CO₂ from fuel alone. The calculator subtracts the e-bike electricity emissions using a grid intensity factor and your Wh/mi, giving you net CO₂ savings.

Typical e-bike energy use ranges between 20 and 35 Wh/mi. Factors like rider weight, terrain, weather, tire pressure, and speed can push it lower or higher. The lower your Wh/mi, the higher your CO₂ and cost savings from switching from car to e-bike. Our calculator lets you enter your Wh/mi to see how that impacts results.

Yes. Enter your car’s MPG, daily round-trip miles, and number of workdays per month. The calculator multiplies miles × days to find your monthly mileage, divides by MPG for gallons used, applies the gas price, then subtracts e-bike electricity cost to show your savings.

Charging an e-bike produces relatively little CO₂ compared to burning gasoline. For example, at 30 Wh/mi, 1,000 miles requires 30 kWh. At a grid emissions of 0.417 kg CO₂/kWh, that’s ~12.5 kg CO₂ — far lower than the hundreds of kg from fuel. The calculator subtracts this electricity-based CO₂ from the fuel CO₂ to compute net savings.

If you charge your e-bike using solar panels or other 100% renewable energy, the electricity CO₂ emissions drop to nearly zero. In that scenario, your CO₂ savings almost equal the full gasoline emissions avoided. You can simulate this by setting the grid emissions factor to zero (or manually overriding Wh/mi or kWh CO₂) in the assumptions panel.

Yes. Frequent stops, heavy loads, steep hills, or extreme weather conditions can raise your e-bike’s Wh/mi and reduce your savings. We recommend increasing your Wh/mi input (e.g. 35–45 Wh/mi) in those situations. The more precisely you adjust these parameters, the more realistic your CO₂ and cost predictions.

Absolutely. The “Adjust assumptions” panel allows you to override gas price per gallon, electricity cost per kWh, and Wh/mi for your e-bike. Try high- and low-cost scenarios to see what your savings look like under fluctuating fuel and utility markets.

For a 30-MPG car, every 10 miles traveled emits ~2.96 kg CO₂ (using 8.887 kg CO₂/gal). An e-bike consuming 30 Wh/mi emits ~0.0125 kg CO₂ per mile (0.417 kg CO₂/kWh × 0.03 kWh). That’s roughly 95% lower CO₂ per mile vs. a car. Your savings scale with commute distance, frequency, and your specific inputs.

In many cases — yes. With a 20–30 Wh/mi e-bike, modest electricity rates, and typical car fuel prices, you’ll often see CO₂ reductions of 80%–95% and cost savings of $100–300/month (depending on commute length). Use our calculator with your real numbers (ZIP, MPG, Wh/mi) to see your personalized “break-even” and savings potential.