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WR
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Gym avg
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Weight
Height
Fair equivalent
Fill both lifters’ weight and height, then enter a 1RM on either side.
Lifter A
kg
cm
kg
Lifter B
kg
cm
kg
Benchmarks
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WR
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Gym avg
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Reference ratios
How lifter B benchmarks compare to lifter A for this lift.
WR B / A
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Gym avg B / A
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Size weight converter for training partners
Compare two same-gender lifters fairly when bodyweight and height differ — squat, bench, deadlift, or total — using powerlifting weight-class standards as the baseline.
Why absolute weight is not fair
Gym partners who share a gender but not a frame size hit the same question: if I bench 100 kg, what should my lighter friend load? Copying the number ignores weight class — a 90 kg lifter and a 75 kg lifter are not playing the same game on absolute kilos.
Heavier lifters move more bar weight for the same effort level. This converter maps each person to a powerlifting weight class, then compares their lift to class records and gym averages — so targets stay relative, not ego-driven.
How the size conversion works
- Enter bodyweight and height for lifter A and lifter B — we assign each a powerlifting weight class.
- Pick squat, bench, deadlift, or total; class world records and gym averages load for each side.
- Enter a 1RM on either side; we scale it so the other lifter gets the matching relative load for their class.
Same-gender only: men vs men or women vs women. For mixed-gender partners, use the Couple Strength Converter instead.
People also ask
Does height matter or only bodyweight?
Both are used to place each lifter in a class. Weight is the main driver; height helps separate borderline cases.
Can I compare a man and a woman?
No — use the Couple Strength Converter for mixed-gender comparisons. This tool is for same-gender training partners.
Which lifts are supported?
Back squat, bench press, deadlift, and powerlifting total — the lifts with reliable weight-class benchmark data.
kg or lb?
Toggle weight units with the control above the converter. Height switches between cm and in independently.
What training partners say
“We’re both guys but 20 kg apart — finally a number my lighter mate can actually hit on bench day.”
“Weight class averages beat guessing ‘take 15 kg off my max’ every time.”