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Velocity Training (VBT) Calculator

The bar speed never lies about how strong you are today.

Velocity-based training replaces guessing with a speedometer: every lift has a load-velocity relationship, so bar speed reveals what percentage of your max is on the bar — and therefore today's true max, which fluctuates with fatigue. This calculator applies the average load-velocity profiles from published research (González-Badillo and colleagues) to bench press, back squat, and deadlift: enter load and mean concentric velocity, get estimated %1RM and daily 1RM.

Why people use this

Lifters with a VBT device (or a phone app) use this to autoregulate: bar speed reveals today's strength before you waste a warm-up guessing. Coaches use it to set velocity targets instead of fixed percentages — the difference between training an athlete and training a spreadsheet.

How it works

  1. Pick the lift — each has its own profile (squats move faster at a given %1RM than bench).
  2. Enter the load and mean concentric velocity from your VBT device or phone app.
  3. The calculator interpolates the load-velocity profile to estimate %1RM.
  4. Estimated daily 1RM = load ÷ %1RM — use it to autoregulate the day's working weights.
  5. Reference table below shows the full profile, including the minimum velocity threshold.

Common questions

How accurate is velocity-based training?

The load-velocity relationship is remarkably stable within an individual (r > 0.95 in studies), but average profiles vary between lifters by several percent. Best practice: calibrate your own profile over 2–3 sessions, then re-check monthly as you get stronger.

How do coaches use velocity stops?

Stop a set when velocity drops a set percentage from the first rep: ~10–15% drop for speed-strength, ~20% for maximum strength, ~30–40% for hypertrophy. It ends sets at the right fatigue dose instead of an arbitrary rep count.

What is the minimum velocity threshold?

The slowest velocity at which a lifter can complete a rep — roughly their true 1RM speed. Around 0.15–0.2 m/s for bench and deadlift, ~0.3 m/s for squat in research averages. A rep slower than your threshold fails.

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