Anyone have a link to a reverse TDEE calculator? Or a formula in their brain?

minties82

I'm not good with math. I'm trying to figure out an average TDEE for myself based on actual energy intake and kg lost. I am sure I am calculating it incorrectly though as I get a number that sounds too large. It doesn't help that I work in kilojoules for intake and kilograms for outgoing I suppose!

I found a google doc but it is read only.

over a 7 day period:
I ate 6541kj per day (45,789 over the week)
I lost 157.14g per day (1,100g over the week)

A kilogram loss is meant to represent a deficit of 37,000kj.

If someone who's brain is actually working today could help me out that'd be cool. The kids won't leave me alone and I can't think! I am trying to see how exercise and macros are influencing my losses etc.

FIT_Goat

It would be 1.1 * 37000 / 7 + 6541 (weight lost * energy per unit of weight / time period + average energy consumed during time period)

Edit: I get 12,355 kj/day from this (which is about 2,950 kcal/day). That seems pretty high, but not insanely so. There's more problems with this than you want to know though. You need a LOT of data (talking months). On top of that, 1 kg isn't really 37,000 kj. It might be more than that or less than that. That's an assumption. It's not even a good one, it's probably much too high. That's almost 9000 calories per kg... a better assumption is 7700 calories or 31,400 kj. Even that is a really rough assumption, and doesn't mean much for this calculation.

minties82

I see what you are saying there, thanks so much. That is is how I was calculating but thought it sounded too much. I suppose every day and week requires different energy needs though as some weeks are half that loss. Cool bananas as my son says.

I get in kcal that the average daily TDEE was 2,953 which sounds ridiculous for a 4'11" 32 year old female. I did jog very short distances and did a couple of weightlifting sessions but that's about it. However I think I ate more fat...will have to check.

FIT_Goat

You might want to look at this: http://www.zoeharcombe.com/2014/06/the-calorie-theory-prove-it-or-lose-it/

It's where someone investigates the actual science behind the 3,500 kcal = 1 pound of body fat statement. There's no real science behind it, and the actual number returned from tests are wildly variable.

Note: using the 3,500 kcal per pound, I get a TDEE of 11,475 kj/day for you... around 2,740 kcal/day.

Anyway, this is always going to be a real rough estimate. None of these numbers actually mean anything. What matters is long term progress towards your goal. Are you going in the right direction? Are you going at a rate you can live with? Then don't change anything. If it's a little slow, you might want to try lowering intake or carbs, and see if it improves.

sweetteadrinker2

I think it's like this:

1.1 kg lost-deficit of 40700 kj for the week->40700/7=5814.28571429 average daily kj deficit

6541kj(average daily intake)+5814kj (average deficit)=12355.2857143 kj (average tdee)

Thats about 2952 calories as a TDEE for all of us who work in that unit.

Your stats would be helpful, but that doesn't sound out of bounds at all to me.

wabmester

FIT_Goat wrote: »

It's where someone investigates the actual science behind the 3,500 kcal = 1 pound of body fat statement. There's no real science behind it, and the actual number returned from tests are wildly variable.

It doesn't take much science. It's just a statement of the caloric content of fat. Body fat = 87% lipids. lipids ~= 9 calories / gram. 1 lb = 454 grams, so that's 395 g of fat ~= 3500 calories.