Measure ball speed from your own videos
VeloFrame is a free, mobile-friendly tool that turns a slow-motion video into an accurate ball-speed reading. Whether you are timing a baseball pitch, a tennis serve, or a soccer strike, VeloFrame lets you measure real speed with nothing more than your phone and the footage you already have — no radar gun required.
How it works
Pick your sport
Presets for baseball, tennis, and soccer pre-fill the standard travel distance, or enter a custom distance of your own.
Upload slow-motion footage
Mark the frame where the ball is released and the frame where it arrives.
Get the speed
VeloFrame uses the video’s frame rate and the distance to calculate the average speed in mph or km/h.
Save and track
Group your measurements into named sessions and watch your average speed over time.
Built for athletes and coaches
The calculator is free to use for everyone. Upgrade to Premium once to unlock room for up to 50 named sessions with 25 saved speeds in each, so you can log an entire season of progress in one place.