Maintenance calories for a 100 lb man

A 30-year-old man weighing 100 lb at 5′10″ burns about 2,130 calories a day lifting four days a week with 7,500 to 10,000 daily steps, and about 1,705 with a desk job and little activity. To lose about 0.5 lb a week, eat around 1,880 a day.

Updated

About you

Body fat is optional.

Sex
years
lb
Height
ft
in
Training sessions a week

Your phone's weekly average is the honest number. Steps move your TDEE more than gym days do.

%

Adds Katch-McArdle and Cunningham, which work from lean mass instead of total weight.

Your TDEE

2,130kcal/day
BMR at rest (Mifflin-St Jeor)
1,420 kcal
Activity factor
×1.50

Calorie targets

Macros for cut

Protein
100 g
Carbs
253 g
Fat
52 g

Your BMR by formula

Without a body fat %, only Mifflin-St Jeor can run. With one, the lean mass formulas join in and Katch-McArdle sets your TDEE.

Mifflin-St Jeor1,420 kcal
Katch-McArdleNeeds body fat %
CunninghamNeeds body fat %

Your TDEE at each activity level

The classic multipliers most calculators use, applied to your BMR. Use it to sanity check the steps and sessions estimate above.

Activity levelMultiplierTDEE
SedentaryDesk job, little exercise×1.21,705 kcal
Lightly activeExercise 1 to 3 days a week×1.3751,950 kcal
Moderately activeExercise 3 to 5 days a week×1.552,200 kcal
Very activeHard exercise 6 to 7 days a week×1.7252,450 kcal
Extremely activePhysical job plus hard training×1.92,700 kcal

The calculator above starts at 100 lb. Change your age, height, steps and training days for your own number.

TDEE by height and activity at 100 lb

Worked out with Mifflin-St Jeor for a 30-year-old man. Find your height, then read across to how active you are.

TDEE by height and activity at 100 lb
HeightSedentaryLightly activeModerately activeVery activeExtremely active
5′4″1,5901,8202,0552,2852,515
5′6″1,6301,8652,1002,3402,575
5′8″1,6651,9102,1502,3952,635
5′10″1,7051,9502,2002,4502,700
6′0″1,7401,9952,2502,5052,760
6′2″1,7802,0402,3002,5602,820
6′4″1,8202,0852,3502,6152,880

Calories to cut, maintain or bulk at 100 lb

Targets for a 30-year-old man at 5′10″ who lifts four days a week and walks 7,500 to 10,000 steps a day, with the pace set as a share of bodyweight.

Calories to cut, maintain or bulk at 100 lb
GoalCalories a dayWeekly change
Fast cut1,755−0.75 lb
Cut1,880−0.5 lb
Slow cut2,005−0.25 lb
Maintain2,130None
Lean bulk2,255+0.25 lb

TDEE by age at 100 lb

The formula takes 5 calories a day off resting energy for every year of age, so the same body burns a little less each decade. Worked out at 5′10″.

TDEE by age at 100 lb
AgeBMRSedentaryModerately active
20 years1,4701,7652,280
30 years1,4201,7052,200
40 years1,3701,6452,125
50 years1,3201,5852,045
60 years1,2701,5251,970

How much protein at 100 lb

Most of the research on lifters lands between 1.6 and 2.2 g of protein per kilogram of bodyweight a day. At 100 lb that is 73 to 100 g a day, with the top of the range most useful during a cut.

Other bodyweights

TDEE Calculator

Frequently asked questions

How many calories should a 100 lb man eat to lose weight?

Start from maintenance and take off enough to lose about 0.5% of bodyweight a week. For a 30-year-old man at 5′10″ who lifts four days a week, maintenance is about 2,130 calories, so a cut sits near 1,880 a day. Weigh in daily, compare weekly averages, and adjust by 100 to 150 calories if the trend is off after two to three weeks.

How many calories should a 100 lb man eat to build muscle?

A lean bulk gains about 0.25% of bodyweight a week, which at 100 lb is a surplus of about 125 calories a day. That puts a man at 5′10″ who lifts four days a week near 2,255 calories a day, with 73 to 100 g of protein.

How many calories does a 100 lb man burn at rest?

At rest, a 30-year-old man at 5′10″ and 100 lb burns about 1,420 calories a day: that is the BMR. With a desk job and little exercise, the total for the day is about 1,705 calories.