Power system calculator

free

Estimates top speed, motor RPM, runtime, and motor temperature risk from your power system. For brushless setups (sensored or sensorless). All math runs locally — nothing is saved.

Inputs

Crawlers ~1000–2700 · Bashers ~3000–6500 · Speed runs 7000+
Most 1/10: 2.6 · 1/8: 3.2 · Crawlers: 30–80
Mild bashing 25–40A · Race 50–80A · WOT 100A+

Estimated output

Pack voltage (nominal)
—
Motor RPM (no-load)
—
Final drive ratio
—
Wheel RPM
—
Top speed (theoretical)
—
Top speed (real-world ~70%)
—
Pack energy
—
Estimated runtime
—
Adjust any input — results update instantly.
Disclaimer. These are theoretical estimates based on standard formulas (RPM = kV × V; speed = wheel RPM × tire circumference). Real-world numbers depend on tire slip, ESC limits, gearing wear, terrain, and battery sag. Always sanity-check temps with an IR thermometer.