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Free strength calculators

Estimate 1RM, calculate strength ratios, measure your dynamic strength index, load velocity profile and more.
All available to use online for free, no sign up or registration required.

1RM estimation calculator

Automatically estimate your one rep max on any exercise using seven scientifically validated formula.
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1RM warmup calculator

Going for a max effort set? Use this calculator to find the ideal warm up weights and reps before your attempt.
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Load velocity profile

Generate a load-velocity profile from your training to estimate 1RM, track progress and more from your barbell velocity data.
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RPE 1RM calculator

Convert any weight and RPE combination into a complete RPE chart and 1RM estimate. Includes options for including bar speed.
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RPE - last rep velocity converter

Find the last rep velocity that matches with each RPE value on your lifts. Ideal for lifters using VBT and RPE in their program.
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DSI - Dynamic strength index

Measure the relationship between your explosive potential and your maximum force production.
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Strength standards calculator

Enter your best weights and see how you stack up against elite lifters for these same movements.
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Strength ratios calculator

Compare your best weights across the key barbell lifts to see which movements are your strongest and which might be lagging.
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Get free VBT training resources

I'll send you a bunch of great free VBT resources. Fundamentals of VBT e-book, velocity based training programs, VBT spreadsheets, coach resources and more when you sign up for the VBT coach newsletter.

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