TDEE Calculator for Over 50

Age-adjusted defaults plus what actually shifts after 50: BMR decline drivers, muscle preservation in a deficit, and the protein floor that protects lean mass.

Your Stats

Gender

Your Results

Basal Metabolic Rate (BMR)
— cal/day
Total Daily Energy Expenditure
—
calories per day
Daily Calorie Targets
Cut
—
-500 cal
Maintain
—
TDEE
Bulk
—
+500 cal

How much does TDEE really drop with age?

The popular number is ~2% per decade after 30. The Mifflin-St Jeor equation alone drops BMR by 5 calories per year of age — about 50 cal/day per decade. That's real, but small. A 55-year old's BMR is only ~125 cal/day below their 30-year-old self, all else equal.

"All else equal" is the catch. Most of the metabolic slowdown people feel after 50 isn't BMR — it's the things underneath:

  • Muscle loss (sarcopenia): ~3–8% of muscle mass lost per decade after 30 in inactive adults. Less muscle means less resting calorie burn.
  • Lower daily movement (NEAT): people sit more, walk less, fidget less. NEAT can drop 200–500 cal/day without anyone noticing.
  • Lower thyroid output and other hormonal shifts: modest contributors, but real.
  • Reduced training intensity: calories burned during exercise scale with how hard you work.

The good news: most of those are partly modifiable. Resistance training pushes back on sarcopenia. Step count addresses NEAT. Sleep and stress hit the hormonal layer.

Muscle preservation is the whole game in a deficit

At 25, you can lose weight on a sloppy diet and bounce back. At 55, the muscle you lose in a careless cut is much harder to put back on. That changes the priority order in any fat-loss plan:

  1. Resistance training, 2–3 sessions/week minimum. Heavy enough to be a real stimulus. This is non-negotiable in a deficit at this age.
  2. Protein floor. Hit it every day. See below.
  3. Modest deficit. 10–20% below TDEE, not 30%+. Slower fat loss but real muscle protection.
  4. Recovery (sleep, stress). Compresses faster at this age. Bad sleep visibly worsens hunger and training quality.

The protein floor at 50+: aim higher than you used to

Older muscle is less responsive to protein — researchers call this anabolic resistance. The threshold to actually trigger muscle protein synthesis is higher than it is at 25. Practically:

  • Target: ~1.0 g protein per pound of lean body mass per day. For most people that's 0.7–1.0 g per pound of total body weight.
  • Per meal: 30–40 g of high-quality protein. Less than ~25 g/meal often fails to clear the synthesis threshold in older adults.
  • Distribution: 3–4 protein-anchored meals across the day beats one big protein meal.

That math means a 180-lb adult should target ~140–160 g protein/day, spread across meals. If you're not hitting that consistently, this is the single highest-leverage change you can make for body composition at this age.

What to do with the number

Take your TDEE to the macro calculator and set protein first. If your goal is fat loss specifically, use the TDEE for weight loss variant and stick to the slow or moderate deficit — aggressive cuts cost you muscle at this age.

Frequently asked questions

Does metabolism really slow down after 50?

Modestly, yes. The Mifflin-St Jeor equation alone drops BMR by ~5 cal/day for every year of age, so a decade of aging is ~50 cal/day from age math. The bigger driver is unmeasured: lost muscle mass. Most of the 'slower metabolism' people feel is sarcopenia plus reduced daily movement, not a broken metabolism.

How much protein do I need at 55+?

More than the standard RDA. Aim for ~1.0 g per pound of lean body mass — for most people that's 0.7–1.0 g per pound of total body weight. Older muscle is less responsive to protein (anabolic resistance), so the threshold to actually trigger muscle protein synthesis is higher. Spread it across 3–4 meals, ~30–40 g per meal.

Can I still lose weight at this age?

Yes — the rate is the same per calorie of deficit. The difference is the cost: losing muscle in a deficit is harder to get back at 55 than at 25, so the protein floor and resistance training matter more, not less. Don't crash; ~20% deficit max with hard lifting.

I haven't lifted in years. Is it too late to build muscle?

No. Studies on previously untrained adults in their 60s and 70s show meaningful muscle and strength gains with 2–3 resistance training sessions per week. The first 12–16 weeks are 'newbie gains' for almost anyone, regardless of age.

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