An RC car’s top speed depends on its motor’s KV rating, battery voltage, gear ratio, and wheel diameter, all of which combine to determine how fast the wheels can spin and how much ground they cover per rotation. This RC car speed calculator estimates your vehicle’s theoretical top speed based on these specs, which is useful for comparing setups or planning an upgrade before you buy new parts.
Telemetry Setup
Enter your vehicle specs for real-world estimates.
Awaiting Telemetry
Enter your motor, battery, and gearing details to calculate setup analytics.
Est. Real-World Speed
Theoretical Max: 0 MPH
Max Motor RPM
0
Final Drive Ratio
0:1
Rollout 
0 in
Keep in mind that real-world speed is usually somewhat lower than the theoretical calculation due to factors like surface traction, wind resistance, and battery discharge under load, so treat this as an upper-bound estimate rather than a guaranteed result. If you’re upgrading components to increase speed, changing the motor or gearing typically has the biggest impact on your final result.