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Old 04-02-2010, 04:03 PM   #1
Nathan Krygier
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BMR, every calculator is way different

When I try to check my BMR, at different websites, I get so many different answers. Here are a list of answers for my sedentary BMR:

3000
2959
2450
3005
2454
2621

Clearly these are very different, and could lead to under or over eating.
Is there some sort of formula I can use to figure this out?

I am doing CrossFit based workouts 4-5 days per week.

75 inches tall
210 pounds
Male
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Old 04-02-2010, 04:38 PM   #2
Katherine Derbyshire
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Re: BMR, every calculator is way different

It's impossible to get an exact number without connecting you to a calorimeter. The different numbers probably come from different assumptions about your activity level. That's okay, as even if you had an exact BMR measurement it would be very difficult to measure your intake precisely.

If you're gaining weight and don't want to, eat less. If you're losing weight and don't want to, eat more.

Katherine
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Old 04-02-2010, 04:42 PM   #3
Nathan Krygier
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Re: BMR, every calculator is way different

Quote:
Originally Posted by Katherine Derbyshire View Post
It's impossible to get an exact number without connecting you to a calorimeter. The different numbers probably come from different assumptions about your activity level. That's okay, as even if you had an exact BMR measurement it would be very difficult to measure your intake precisely.

If you're gaining weight and don't want to, eat less. If you're losing weight and don't want to, eat more.

Katherine
True, but I am not sure what to use as a starting point.
Perhaps I should use 2500, and see what happens. This way I wont go over.

So far Ive eaten the following:

Breakfast
- 3 eggs (240 cal)
- PBJ Sandwich (380 cal)
- 1.5 cups skim milk (150 cal)

Workout
jog 5 min
50 step ups
25 box jumps
stretch

[repeat 4x]
15 thrusters 90#
100 jumping jacks

Lunch
- 12 in subway sub (wheat, turkey, provalone,lettuce, spinach, lite mayo (i know!)) (840 cal)
- Water
- 1 cup gatoraid rain

Total: 1610 cals

Last edited by Nathan Krygier : 04-02-2010 at 05:03 PM.
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Old 04-02-2010, 04:53 PM   #4
Lincoln Brigham
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Re: BMR, every calculator is way different

Quote:
Is there some sort of formula I can use to figure this out?
Absolutely not.

As Katherine said, the precision needed to calculate a useful answer is not possible. Even if you could calculate your BMR accurately -- and you can't --- it wouldn't be possible to match your calorie consumption with any degree of precision.

Don't take a sniper rifle to go duck hunting.

Last edited by Lincoln Brigham : 04-02-2010 at 04:56 PM.
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Old 04-02-2010, 05:43 PM   #5
Katherine Derbyshire
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Re: BMR, every calculator is way different

If it were me, I'd reverse engineer it. My weight has been stable at 125-130 for a long time, so clearly I'm eating the appropriate amount to maintain that weight. So I'd log my food for a week or so to see how much I'm actually eating.

The same trick would work for someone who wanted to gain or lose. Figure out how much you actually ate over the last week, and adjust it down to lose or up to gain. Adjust in increments of 500 calories per day or so until you get where you want to be.

Katherine
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Old 04-02-2010, 06:25 PM   #6
Thomas Kelley
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Re: BMR, every calculator is way different

I found these to be very useful in setting a starting point:

http://www.bodyrecomposition.com/nut...-calories.html (WFS)

http://www.bodyrecomposition.com/fat...ic-intake.html (WFS)

I'm a numbers guy, and his emphasis on the starting point being an estimate makes the most sense to me. Trying to get specific without enough data can lead to misleading and inaccurate results, and it's a total PITA for little return value.

So basically, what the other replies said, but with a few links to someone who I read regularly thrown in.
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Old 04-02-2010, 07:53 PM   #7
Chris Mason
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Re: BMR, every calculator is way different

Just pick one and then monitor from there.
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Old 04-04-2010, 07:33 AM   #8
Mike Ridgley
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Re: BMR, every calculator is way different

So if I were to do some black-box testing with intake quantities - should I avoid any and all 'cheat' meals / drinks during this test phase? Or should I consider these as part of the test to define my weekly intake as close to realistic as possible?
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Old 04-04-2010, 07:46 AM   #9
Katherine Derbyshire
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Re: BMR, every calculator is way different

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Originally Posted by Mike Ridgley View Post
So if I were to do some black-box testing with intake quantities - should I avoid any and all 'cheat' meals / drinks during this test phase? Or should I consider these as part of the test to define my weekly intake as close to realistic as possible?
To establish a true baseline, eat just like you normally would.

On the other hand, it's never too soon to give up junk. If that forms a big part of your diet, getting rid of it might take priority.

Katherine
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