TDEE for Maintenance — Men Age 50-59, Lightly Active

Maintenance means eating at your total daily energy expenditure (TDEE), so energy in matches energy out and body weight stays roughly stable over time. For a 50 to 59-year-old man who is lightly active — light exercise one to three days a week, or a job that keeps you on your feet for part of the day without being physically demanding — the worked example below uses a body weight of 80 kg (176 lb) and a height of 178 cm, and gives a maintenance target of 2,258 kcal/day, equal to TDEE. That figure is an estimate built from a published formula, not a personal prescription: your own numbers will differ if your weight, height or daily activity differ from the example.

The worked example is the whole point of this page. Rather than quoting a single number with no working, it shows the Mifflin-St Jeor equation step by step, multiplies the result by the activity factor for a lightly active lifestyle, and then turns the total into a daily calorie target for maintenance. Use the same steps with your own measurements, or use the calculator linked below, and you will get a target matched to you rather than to the example person.

Calculate your own TDEE

Your weight, height, age and activity level are almost certainly different from the example above, so run your own numbers with the TDEE calculator. It uses the same Mifflin-St Jeor equation and the same activity multipliers shown on this page, and it also gives cutting, maintenance and bulking targets from a single set of inputs. If you only want the resting figure, the BMR calculator gives that on its own. For the maintenance figure specifically, try the Maintenance calorie calculator.

Related pages and tools:

The formula: Mifflin-St Jeor (1990)

The Mifflin-St Jeor equation is the most widely validated formula for estimating resting energy expenditure in adults. It was published by Mifflin et al. in the American Journal of Clinical Nutrition in 1990 (Mifflin MD et al., Am J Clin Nutr 1990;51(2):241–247), and it is the equation most calculators and many clinical settings use as a starting point. For men it is:

BMR = 10 × weight (kg) + 6.25 × height (cm) − 5 × age (years) + 5

For women the final term is − 161 instead of + 5. TDEE is then the BMR multiplied by an activity factor: 1.2 for sedentary, 1.375 for lightly active, 1.55 for moderately active, 1.725 for very active and 1.9 for extremely active. These multipliers are the standard values used with the Mifflin-St Jeor equation.

Working through the example for a 50 to 59-year-old man at 80 kg and 178 cm:

  • 10 × 80 kg = 800 kcal
  • 6.25 × 178 cm = 1,112.50 kcal
  • 5 × 55 years = 275 kcal
  • Constant: + 5 kcal

So BMR = 800 + 1,112.50 − 275 + 5 = 1,642 kcal/day. That is the energy the body would use at complete rest, before any movement, digestion or exercise is counted. Multiplying by the lightly active factor of 1.375 gives TDEE = 1,642 × 1.375 = 2,258 kcal/day.

Your targets at a glance

Figure Value
BMR (Mifflin-St Jeor) 1,642 kcal/day
Activity level Lightly Active (×1.375)
TDEE 2,258 kcal/day
Cutting target (TDEE − 500) 1,758 kcal/day
Maintenance target 2,258 kcal/day
Lean-bulk target (TDEE + 300) 2,558 kcal/day
Larger-bulk target (TDEE + 500) 2,758 kcal/day
Safety floor 1,500 kcal/day (men)

Maintenance is the target this page is built around, 2,258 kcal a day. The other rows are there so you can see how the three goals relate: a 500 kcal daily deficit is worth roughly 0.5 kg of fat loss a week (about 3,500 kcal per week per 0.45 kg), while a 300 kcal surplus is worth roughly 0.25 kg of gain a week. The cutting row stays comfortably above the 1,500 kcal/day safety floor for men, so a 500 kcal deficit is workable for this profile — still an estimate to test, not a prescription.

How activity level changes the number

The same 50 to 59-year-old man at 80 kg and 178 cm has the same BMR of 1,642 kcal/day whatever the lifestyle — but TDEE moves a lot with activity:

Activity level Multiplier TDEE
Sedentary 1.2 1,970
Lightly Active 1.375 2,258
Moderately Active 1.55 2,545
Very Active 1.725 2,832
Extremely Active 1.9 3,120

The gap between sedentary and extremely active is 1,150 kcal a day for this person, which is why two people of the same age, sex, weight and height can need very different calorie intakes. It is also why activity level is the input people most often get wrong: be honest about a typical week, not your best week. If you sit most of the day and train three times a week, you are closer to lightly active than moderately active, and using the higher factor inflates the target. The lightly active factor of 1.375 used on this page describes light exercise one to three days a week, or a job that keeps you on your feet for part of the day without being physically demanding — if that does not describe your week, use the row in the table that does.

What this number does not tell you

A TDEE estimate is a starting point, not a measurement. The Mifflin-St Jeor equation was validated on population averages, and individual resting metabolic rate varies by roughly ±10% around the prediction because of differences in muscle mass, genetics and health. Two people with identical age, sex, weight and height can have BMRs a few hundred calories apart. The equation also uses total body weight, so it is less accurate for very muscular people (it underestimates) and for people with a high body-fat percentage (it overestimates), because muscle burns more energy at rest than fat does.

Activity multipliers are blunt by design. They compress a whole week of movement, training, work and fidgeting into a single number, and they cannot capture a week that mixes desk days with long hikes, or a job that is physical some days and sedentary on others. Food intake itself also costs energy to digest — the thermic effect of food, roughly 10% of intake — which the multiplier approach folds in approximately rather than measuring. Treat the 2,258 kcal target as a hypothesis: follow it for two to three weeks, watch the weekly weight average, and adjust by 100–200 kcal based on what actually happens.

Age 50-59: what changes at this stage

In the fifties, muscle loss accelerates — sarcopenia, the age-related loss of muscle, typically costs 1 to 2 percent of muscle mass a year after 50, and faster without training. Because muscle burns more energy at rest than fat, resting metabolic rate falls with it, and the Mifflin-St Jeor estimate becomes less precise: it will tend to overestimate for a sedentary person with low muscle and underestimate for a trained person of the same weight. The worked example on this page uses average assumptions, so treat the result as a starting point to test against real weight data.

Bone health joins muscle as a priority in this decade. Resistance training and adequate protein support both, and daily walking keeps the activity side of TDEE from collapsing. A target that looked right at 40 may now be 100 to 200 kcal too high if muscle and activity have both drifted down — the two- to three-week test described below is how you find out.

How to use the 2,258 kcal target

Start at 2,258 kcal a day and hold it for two to three weeks before changing anything. Weigh yourself three to four times a week, first thing in the morning, and compare weekly averages rather than single days — daily weight moves by a kilogram or more with water, glycogen and food volume. If the weekly average is flat, 2,258 kcal is a good estimate of maintenance for this profile. If weight is drifting up or down by more than about 0.5 kg a month, adjust by 100–200 kcal a day and reassess after another two weeks.

Maintenance is the phase most people undervalue. It is where training progress, sleep and food quality do their work without the stress of a deficit or a surplus. Protein of roughly 1.4–2.0 g per kilogram of body weight a day — about 112–160 g a day for the 80 kg example — supports muscle maintenance and recovery. Keep the activity level that produced this number: if the lightly active label came from three to five training sessions a week, dropping to one session a week quietly lowers TDEE and turns maintenance into a slow surplus.

Use maintenance as a home base. After a cutting phase, returning to maintenance for four to eight weeks lets hunger hormones, training performance and energy settle before the next decision. It is also the right target for anyone who is happy with their current weight and wants to focus on strength, fitness or general health rather than the scale. If you later decide to cut or bulk, the table above already shows those targets: cutting at 1,758 kcal a day, or a lean bulk at 2,558 kcal a day.

Frequently asked questions

What is the TDEE for a 50 to 59-year-old man who is lightly active?

For the worked example on this page — 80 kg, 178 cm, age 55 — BMR is 1,642 kcal/day by Mifflin-St Jeor and TDEE is 2,258 kcal/day at the lightly active multiplier of 1.375. Your own TDEE will differ if your weight, height or activity differ; use the TDEE calculator with your own measurements.

How was the 2,258 kcal maintenance target calculated?

It starts from TDEE of 2,258 kcal/day. For maintenance the target equals TDEE. The target is an estimate, not a prescription.

Does TDEE fall as you get older?

Yes, slowly. In the Mifflin-St Jeor equation the age term subtracts 5 kcal a day for every year of age, so BMR falls by about 50 kcal a decade when weight and height stay the same — and in practice it often falls faster because muscle mass and daily activity tend to decline with age. That is one reason strength training matters more, not less, as the decades pass. For this page's example, moving from age 55 to ten years older at the same weight and height would lower BMR by 50 kcal a day, to 1,592 kcal/day.

Should I use my current weight or my goal weight in the formula?

Use your current weight. TDEE describes what your body uses now; plugging in a goal weight answers a different question — what you will need once you get there. Recalculate every 5 kg of weight change or so, because a lighter body burns fewer calories and a target set at your old weight gradually becomes a surplus. For a 50 to 59-year-old man, a 5 kg change moves BMR by 50 kcal a day, which is enough to matter over months.

Why is my TDEE different from another calculator's?

Different calculators use different equations (Mifflin-St Jeor, Harris-Benedict, Katch-McArdle) and different activity definitions, so results commonly differ by 100–300 kcal. That spread is normal and is another reason to treat any single figure as a starting estimate and adjust from two to three weeks of real weight data. The figure on this page, 2,258 kcal/day, comes from Mifflin-St Jeor (Mifflin et al., 1990) with the standard activity multipliers — check which equation another calculator used before assuming one of them is wrong.

What should I do if my weight drifts at 2,258 kcal?

First check the basics: are you tracking everything, including oils, sauces, drinks and weekend meals, and has your activity actually stayed at the lightly active level? If tracking is honest and weight has moved steadily for two full weeks, adjust by 100–150 kcal a day in the opposite direction and reassess after another two weeks. Never drop below 1,500 kcal a day without medical supervision.

Estimates only, not medical advice. Minimum safe intakes: 1,200 kcal/day women, 1,500 kcal/day men — consult a healthcare professional before a very-low-calorie diet.