Quick answer
- · Healthy adult, sustained: roughly 75 to 150 W mechanical
- · Trained cyclist, one hour: roughly 200 to 300 W
- · Track sprinter, a few seconds: above 1,000 W
- · Net electricity after 80% conversion: about 0.08 kWh per rider-hour at 100 W
Sustained power is the number that matters
Human power output depends entirely on duration. Almost anyone can produce several hundred watts for a few seconds. Hold the effort for an hour and the numbers collapse: a healthy adult settles somewhere between roughly 75 and 150 watts, and trained cyclists hold 200 to 300 (Wilson, Bicycling Science). For any task measured in hours, the sustained figure is the honest one.
From pedals to electricity
Mechanical watts are not electrical watts. A generator and its power electronics take their share; a well-built rig converts around 80 percent. Our standard model across this site: a rider sustaining 100 watts of mechanical output delivers 80 watts of electricity, or 0.08 kWh per rider-hour. The rider’s muscles are themselves only about 20 percent efficient at turning food into pedaling (PubMed, PMID 8933490), so roughly 16 percent of dietary energy survives the trip to the plug.
What one rider can power
At 80 watts of net electrical output, here is what pedaling can run, and how many simultaneous riders each load requires.
| Load | Draw | Riders required |
|---|---|---|
| LED light bulb | ≈ 10 W | 0.13 riders |
| Wi-Fi router | ≈ 15 W | 0.19 riders |
| Laptop | ≈ 65 W | 0.8 riders |
| Refrigerator (running average) | ≈ 150 W | 1.9 riders |
| Average US home (average draw) | ≈ 1.2 kW | 15 riders |
| One data-center GPU (H100 class) | ≈ 700 W | 8.75 riders |
| 1 MW data hall | 1,000 kW | 12,500 riders |
Figures are modeled from typical device draws and 80 W net per rider; appliance draws vary. For your own workload, the capacity calculator does this math live and generates a shareable card.
Why nobody powers anything this way
At $15 per hour of rider compensation and 0.08 kWh per rider-hour, human electricity costs $187.50 per kilowatt-hour in labor alone, several hundred times a typical retail rate. The complete thermodynamic and economic autopsy lives in Biological Compute at Scale, which begins as an infrastructure report and ends recommending ordinary electricity.
Frequently asked
- How many watts can an average person generate on a bicycle?
- A healthy adult can typically sustain roughly 75 to 150 watts of mechanical output for an extended ride. Short efforts can go much higher, but sustained output is what matters for doing useful work.
- How many watts does a professional cyclist produce?
- Trained cyclists commonly hold 200 to 300 watts for an hour, elite professionals hold more, and track sprinters exceed 1,000 watts for a few seconds. These figures are consistent with ranges reported in the cycling literature, including Bicycling Science (MIT Press).
- How much electricity can a human on a bicycle actually deliver?
- Pedal power must pass through a generator and power electronics before it becomes usable electricity. At a modeled 80 percent conversion, a rider sustaining 100 watts of mechanical output delivers about 80 watts of electricity, roughly 0.08 kWh per hour of riding.
- How many cyclists would it take to power a data center?
- At 80 watts of net electrical output per rider, one megawatt of continuous load requires 12,500 simultaneous riders, before accounting for breaks, food, and the fact that nobody pedals around the clock. This is why data centers buy electricity instead of bicycles.
Sources
Human on a Bicycle is a satirical project. The power figures, conversion efficiencies, and citations on this page are real.