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Old 10-13-2011, 08:22 AM   #1
Matthew Reilly
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1RM Calculators

Does anyone here have experience with online 1RM calculators? If so, have you found them to be accurate. I came across this one yesterday: http://www.exrx.net/Calculators/OneRepMax.html (WFS). I haven't tested any 1RMs for a long time, so I'm curious if it is reasonably accurate.
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Old 10-13-2011, 09:08 AM   #2
Mike Wazowski
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Re: 1RM Calculators

They are ok for 3-5 reps but do not expect, for example, to squat 315 for 10 and then hit 420 for a 'one rep max' if you never had more than 315 on your back.
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Old 10-13-2011, 09:11 AM   #3
Katherine Derbyshire
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Re: 1RM Calculators

Accurate enough if you want to estimate a 1RM and base your training on percentages of it. Not accurate enough if you're trying to figure out what you could lift at a meet. And, as Mike said, more accurate for lower numbers of reps.

Katherine
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Old 10-13-2011, 09:52 AM   #4
Chris Mason
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Re: 1RM Calculators

Just test your 1RM in the gym.... I never understand why people want to use formulas to figure out what they can lift?
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Old 10-13-2011, 09:55 AM   #5
Sean Dunston
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Re: 1RM Calculators

Quote:
Originally Posted by Chris Mason View Post
Just test your 1RM in the gym.... I never understand why people want to use formulas to figure out what they can lift?
Agreed.
Limit strength testing is awesome. You learn a lot about yourself by truly finding that 1RM.
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Old 10-13-2011, 09:59 AM   #6
Mike Wazowski
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Re: 1RM Calculators

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Originally Posted by Chris Mason View Post
Just test your 1RM in the gym.... I never understand why people want to use formulas to figure out what they can lift?
That often happens when you have a high school football player who squats 405 for 10 and the coach enters his max squat as '550', seen it many times.
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Old 10-13-2011, 10:29 AM   #7
Aaron Gainer
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Re: 1RM Calculators

Its a helpful guide in designing a program. Just remember percentages at 80% and up tend to be more accurate in getting close to your 1 rep max.

But, like others have said, try and test your 1 rep max in the gym. It doesn't have to be a limit max, but it should be close.
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Old 10-14-2011, 10:06 AM   #8
Sean Dunston
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Re: 1RM Calculators

perfect example of why these things are inaccurate is shown on one of today's videos with Rob Orlando. He states he can pull a 500# DL for 10, but can't pull 575# for 1. If you go on the calculator you linked and plug in 500# x 10 reps it shows a 1RM of 667# 1RM...



not wfs due to swearing.

http://media.crossfit.com/cf-video/C...eadlift1x7.mov
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Old 10-14-2011, 10:19 AM   #9
Katherine Derbyshire
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Re: 1RM Calculators

FWIW, two weeks ago I found a 3RM back squat and estimated my 1RM from that. Yesterday I actually tested my 1RM and beat the estimate by 5 kilos.

Katherine
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Old 10-14-2011, 07:58 PM   #10
Matthew Schwab
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Re: 1RM Calculators

There is a mental component to 1RM's. You can't calculate that.
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