How much do i need to burn to lose......

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wow that is unsafe and if possible your skin will be saggy...

not sure about the math or conversions between kg & lbs, but there is 3500 calories per pound.

not sure about the math or conversions between kg & lbs, but there is 3500 calories per pound.

well if want to lose 5 lbs a week then you would have to burn 17500 a week............every week..... ( I am just guessing I am by no meansan expert lol) hmmm well, good luck with that.

i keep hearing something about 3500 calories to the pound.
so mathematically,

2.4 Kg ~ 5 lbs (sorry I think in pounds for some reason, odd because I live in Canada right ) per week.
omg, 8 weeks total, so 5 * 8 = 40 lbs (18.14 Kg) total anticipated weight loss.

i don't like to think in terms of single day or weekly boundaries, because the body works continuously right.

so, 40 lbs * 3500 calories = 140,000 calories

so you would need a calorie delta of 140,000 calories to lose 40 lbs in 8 weeks. (mathematically)

8 weeks = 56 days, 140,000 ÷56 ~ 2,500 calorie delta per day (every day for 8 weeks).

so if your input is 1,250 calories per day, and your BMR is 1,746 (what you burn if you just did normal stuffs)

then, 2,500 - 1,250 - 1,746 = -496

Hrm, so according to my maths, you actually need to eat about 496 calories more per day, because as it is now in 8 weeks you would have a calorie delta of 167,776 calories, or about 47.9 lbs (21.7 Kg) total weight loss.

So that's good you can eat about 1900 calories a day and easily be within this range of weight loss per week, without doing any exercise. - lucky

I currently weigh around 255 lbs, trying to lose 2 lbs per week, my BMR is about 2,300 calories, so I 'try' to eat about 1,800 calories per day to get the 2 lbs per week. However, I frequently eat up to 3,000 calories per day, but, I exercise about every day, running, walking, pushing the boys in the stroller. so I earn 1,200 to 2,000 calories per day in exercise credits. So then the maths work out for 3,000 - (1,200 to 2,000) = 1,000 to 1,800 calories per day. So I get to eat more, usually not have to consider or stress over things, or feel bad when i go over, and also I am not *constantly* distracted by always thinking about work. Because when I eat only 1,800 calories per day, that's less than 600 calories per meal right. I'm a big guy, a MEAT eater, and really feel that kind of shakey weak and de-energized when i eat so little like that. But, when I exercise, I feel Super Awesome!!. I get a lot of cardio, and the blood pumping, and that all works to increase my muscle mass too, which helps to increase my BMR, which makes it easier over time to lose weight faster too right. But also I like my new strength, can pick up the boys easier too. And it only takes me about an hour each day, which counts as quality family time, or when the kids go to bed early, i appreciate the quiet alone time to collect my thoughts.

So I would say, that your NET calories should be around 1,500 calories, puts you nicely in your goal to lose that much weight. BUT, you should do it by offsetting the calories you eat with a bunch of exercise, instead of just eating tiny tiny amounts of food and not exercising at all. Er, are you exercising that is ?

i was adding on what ive already lost as well.

as to losing weight quickly, i dont know about anywhere else, but in Australia, if your majorly overweight, the Drs say it is safe to lose a larger amount each week, plus i onyl want to do it for a short time, andwill go back to normal weightloss after that.

8 weeks isnt a short time though. And if you were to burn huge amounts of calories and consume little, you would be crash dieting and we all know that doesnt work.

Like I said in my other post, there are other side effects and none of them are pretty. Muscle and hair loss doesnt look good on anyone and sure isnt healthy

66 pounds in 8 weeks? Why?

i am honestly horrified that you'd want to lose 5 pounds a week, and this is just for a community weightloss challenge? i find your situation very saddening. you are willing to go to extreme measures to go through a quick fix, throw your body and metabolism into a horrid mess-- and mainly for a prize and a boost in motivation. i guess for you, the end justifies the means, no matter what the cost. that's your decision but i definitely don't support it. i hope that one day you will realize that there is no quick fix to weight loss and that you will adopt some healthy habits and perspectives that you can maintain for the long haul.

yea. doh... i meesed up the maths..


not minus the food intake,

it should be deficit need plus the food intake minus the BMR.

2,500 + 1,250 - 1,746 = 2004 calories.

which is technically not possible to do with just calories alone. e.g. eating absolutely nothing at all you only get the burn from BMR, most in theory possible to lose per day is 1746. Unless can increase BMR somehow thru exercise. but then yea, the starvation mode kicking in and the BMR goes down pretty fast then you gain weight from water retention, just before you die and such.

For me, to burn 2000 calories takes me about a 10 mile run, or about two hours. But I can't do that every day. at best every second day, but I also eat about 4000 calories per day when i do that, so my net calorie intake is then still about 2000, which is slightly less than my BMR value, for 1.8 lbs per week loss.

well said!

You would need to burn 2,500 calories a day below your maintenance calories. So if you maintained at 2,200 calories per day you could just EAT NOTHING each day and then burn an additional 300 calories a day, which you could do with 45 minutes of cardio. Please come back to this thread in a couple of weeks and let us know how it goes.

Here are the numbers I used.

Sex: Female
Age: 34
Weight: 108.4 kg
Height: 159 cm
Body Fat % Estimation: 41.25%
Lean Body Mass Estimation: 64 kg
Fat Mass Estimation: 45 kg

BMR: 1746 k/cal
BMR Adjusted for Incidental Exercice: 2094 (walking, talking, showering, shopping, house chores, driving, working etc)


1 lb = 3500 k/cal
5 lb = 3500 * 5 = 17500 k/cal
17500 / 7 days per week = 2500 k/cal per day deficit

It sounds ugly, dangerous and I can't believe you'd want to do this. The weight didn't appear on you overnight, so you don't want to get rid of it that fast. Make changes in your lifestyle that you can sustain over time. Fad diets do not work and there are thousands of them out there with many more thousands of people who tell you they work. What works is educating yourself about your body, nutrition, a good healthy balanced diet, water intake and exercise. For someone like yourself I'd consider consulting with a nutritionist and/or your doc to make sure you're not overlooking anything which could cause you more harm than good.

I was told that I would need to burn 3,500 calories in order to lose 1lb of fat and I have proved that this works for me. From my understanding that equates to doing 500 calories worth of exercise daily.....or a daily 500 calorie deficit in food consumption (not adviseable). If you are not eating back all the calories you burn you should lose a 1lb a week...but there are people out there who will tell you that you should eat back the calories....which makes it more confusing.....
Everybodys metabolism is different due to age/health/weight etc.... so you need to find out what works for you...