RMR vs. BMR and how to calculate TDEE


55+ Old school lifter
I really need to drop my BF%, so I'm looking at first getting my diet in check. Today I had a BodPod test, BF% is 21%, I want to get into the low teens eventually but I'm 56 so I'll take what I can get!
I also had Resting Metabolic Rate tested at 1950 cal.

However, to calculate TDEE, all the online calculators use BMR not RMR that I was measured for. So ... is TDEE calculated off RMR or BMR and is there a preference?



New member
I strongly suspect that RMR and BMR are interchangeable.

That said, I personally have doubts about the usefulness of the concept - I don't think that TDEE can be established with sufficient accuracy to guide nutrition for weight loss, there are just too many variables. Hormonal milieu exerts a stronger influence than caloric balance.

(I'm a 55 y/o old school lifter too, about to turn 56!)


55+ Old school lifter
Well, RMR was tested at 1950cals and the tester said that’s what you burn to exist in a day , don’t go lower. But if I use any online calculator, figure in TDEE and drop it by 20% for a cut, I come in lower?

I’ve been winging it for the past 6 months and gone from 200 to 180, 29% BF to 21% BF so I must be doing something right. No gear, and I do look better I’ll take it!


New member
I'm just a apprentice in diet and the ins and outs but after reading 3Js thread and seeing the system of BMR/TDEE and adjusting it the main point I got was establishing a decent start point based off some measured and mathematically established point and adjusting from there.

If your body weight is steady decrease calories by a couple hundred a day and run it out for a while.

I can build rituals around things. My weight ins are always in the morning after 1 or 2 cups of coffee, morning poo and no food. If I dont poo in time and have drank more coffee or ate for some reason I wont step on the scale. If I feel like I might have to take a leak I try.

My only diet knowledge would come from eating issues with epilepsy medications. Over the last 3 years I dropped from like 157lb down tob135lbs, up tob173lbs starting TRT and lifting, back down to the 150s and I'm now sitting at 168 lbs.

I think a true number iabsimikiar to an equilibrium price in business or economics. It's a thing and a point but the variables male ot impossible to calculate a precise price and calories per person can be the same thing and it fluctuates daily.