Compare the environmental and economic impact of cycling versus driving. Discover potential savings and health benefits of biking to work.
Last updated: March 2026
Fraction of car maintenance attributable to commute
CO₂ per calorie consumed (default: 0.001)
This calculator compares the true costs and environmental impact of driving versus cycling for regular commutes. Unlike simple fuel-cost calculators, this tool accounts for parking fees, maintenance costs, and uses scientifically-based formulas to calculate CO₂ emissions from actual fuel consumption and calories burned based on rider weight and cycling speed.
For short to medium commutes (under 15 km / 9 miles), cycling often saves significant money while providing health benefits equivalent to a gym membership. The calculator uses MET (Metabolic Equivalent of Task) values to accurately estimate calorie expenditure based on your specific riding speed and body weight, providing personalized results for your situation.
Environmental calculations are based on EPA-verified emissions data: gasoline combustion produces 2.31 kg CO₂ per liter (≈8.89 kg per gallon). Cycling emissions in this tool are estimated from two components: calories burned (converted to CO₂ using a diet-dependent factor) and a small amortized manufacturing/maintenance footprint. Dietary and manufacturing factors vary widely by study and region; the tool uses conservative defaults and shows calculated values so you can adjust inputs. The "trees equivalent" represents a conservative benchmark (one tree ≈ 15 kg CO₂/year, real-world average) and varies by species, age, and climate.
Select Imperial (miles, MPG, gallons) or Metric (km, L/100km, liters) to match your familiar measurements.
Provide your one-way commute distance and frequency (trips per week). The calculator assumes round trips.
Enter your vehicle's fuel efficiency, current fuel price, parking cost per trip, and monthly maintenance estimate. CO₂ emissions are calculated from actual fuel consumption (2.31 kg CO₂ per liter of gasoline).
Your weight and typical cycling speed determine calorie burn using MET values: leisurely (<12 km/h) = 4.0 MET, moderate (12-17 km/h) = 8.0 MET, vigorous (17-22 km/h) = 10.0 MET, racing (>22 km/h) = 12.0 MET.
Review annual cost savings, detailed breakdown of car expenses, CO₂ reduction, and health benefits from cycling.
Emissions are calculated from actual fuel consumption using EPA data: gasoline produces 2.31 kg CO₂ per liter (8.89 kg per gallon) when burned. Your annual fuel use is calculated from distance, efficiency, and then multiplied by this factor. This is more accurate than fixed per-km rates.
Cycling emissions (~5-20g CO₂/km) come from lifecycle analysis: manufacturing the bike (amortized over its lifespan, ~5g/km) and food production for the calories you burn (varies by diet, 0-15g/km). While minimal compared to cars (typically 95-98% less), it's not zero.
Calories use MET (Metabolic Equivalent of Task) values validated by exercise science: 4.0 MET for leisurely (<12 km/h), 8.0 for moderate (12-17 km/h), 10.0 for vigorous (17-22 km/h), 12.0 for racing (>22 km/h). Formula: MET × weight (kg) × hours = calories.
One tree absorbs approximately 15 kg of CO₂ per year (conservative real-world average). This varies significantly by species, age, and climate (range: 10-50 kg/year), but provides a relatable context for emissions reductions. The number shown represents how many trees would be needed to offset your annual CO₂ impact.
While these are real costs, they depend heavily on individual circumstances (car age, coverage level, driving record) and many people keep their car for non-commute use, making it hard to attribute these costs solely to commuting. You can mentally add ~$1,500-3,000/year for these factors.
Weather: Many year-round commuters use rain gear and have backup options for extreme conditions. E-bikes make headwinds/hills manageable. Safety: Use bike lanes when available, wear visibility gear (lights, reflective clothing), and practice defensive riding. Infrastructure improvements are making cycling safer in many cities.
Most people can comfortably bike 5-10 km (3-6 miles) regularly with moderate fitness. E-bikes extend this to 15-25 km (9-15 miles) with minimal effort, arriving without sweating. Build up gradually, and consider partial combinations (bike + transit for longer commutes).
Solutions: ride at a comfortable pace (you shouldn't be breathing hard), use an e-bike, bring a change of clothes, keep work clothes at the office, or check if your workplace has showers. Many discover they don't sweat as much as expected on shorter commutes at moderate pace.
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