Ages 65+

TDEE Calculator for Seniors

Adults over 65 experience reduced metabolic rate and muscle mass which lowers calorie needs, but protein requirements actually increase to prevent sarcopenia. This calculator provides accurate TDEE estimates for seniors, building on the Mifflin-St Jeor equation, to help maintain a healthy weight and muscle mass as you age.

Age-adjusted formula · Mifflin-St Jeor equation · Instant results
No signup required Age-adjusted formula Instant results
Your gender
Your height
Your weight
Your daily calorie targets
Maintenance (TDEE)
—
kcal / day
Calories to maintain current weight
Gentle Deficit
—
kcal / day
-250 kcal · safe, slow loss
Muscle Support
—
kcal / day
+200 kcal · preserve muscle mass
Your BMR — Calories burned at complete rest
Calculated using the Mifflin-St Jeor equation
These estimates are for informational purposes only. The Mifflin-St Jeor equation is less accurate for adults over 70. Always consult a doctor or registered dietitian before making significant dietary changes.
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How Metabolism Changes After 65

After 65, the body undergoes significant metabolic changes. Sarcopenia - the age-related loss of muscle mass - accelerates, reducing BMR by roughly 1-2% per decade after 50. Combined with typically lower activity levels, most seniors need 200-400 fewer daily calories than they did in their 40s.

However, protein requirements actually increase with age. Older adults need 1.2-1.6g of protein per kg of bodyweight daily to counteract muscle loss - significantly more than the 0.8g/kg recommended for younger adults.

Male BMR = (10 x kg) + (6.25 x cm) - (5 x age) + 5
Female BMR = (10 x kg) + (6.25 x cm) - (5 x age) - 161
Note: May overestimate TDEE for adults over 70 with low muscle mass

Your Personalised Senior TDEE

The Importance of Resistance Training for Seniors

Resistance training is the most powerful intervention available to seniors for maintaining metabolic health. Even 2-3 sessions per week of bodyweight exercises, resistance bands, or light weights can significantly slow sarcopenia and keep BMR higher.

Example - 68-year-old female, 65 kg, lightly active:

BMR = approx. 1,263 kcal

TDEE = 1,263 x 1.375 = approx. 1,737 kcal/day

With muscle loss, actual TDEE may be 100-150 kcal lower.

More Calorie Tools

TDEE for Women Over 40
Calorie targets adjusted for perimenopause and menopause.
TDEE for Teens
Growth-adjusted TDEE estimates for teenagers aged 13-19.

Frequently Asked Questions

How many calories does a senior need per day?+
Most sedentary seniors need 1,600-2,000 kcal per day depending on sex and body size. Active seniors need 2,000-2,600 kcal. Calorie needs decrease roughly 100-150 kcal per decade after 50 due to declining muscle mass and reduced activity. Use this calculator for a personalised estimate.
Why do seniors need fewer calories but more protein?+
Seniors need fewer total calories because lower muscle mass reduces BMR and activity levels typically decline. However, protein needs increase to 1.2-1.6g per kg bodyweight to combat sarcopenia - the age-related muscle loss that accelerates after 65. Getting adequate protein helps preserve muscle, strength, and independence.
How can seniors boost their metabolism?+
Resistance training is the most effective method - even 2-3 sessions per week significantly slows age-related muscle loss and keeps BMR higher. Walking and light aerobic exercise also help. Eating adequate protein supports muscle maintenance. Staying hydrated also supports metabolic function.
Should seniors try to lose weight?+
Unintentional weight loss in seniors is a medical concern and should be evaluated by a doctor. Intentional weight loss for obese seniors can improve health outcomes but should be supervised medically and done slowly - no more than 0.25-0.5 kg per week - to preserve muscle and bone density.
How accurate is TDEE calculation for seniors?+
The Mifflin-St Jeor equation is less accurate for adults over 70 because it was developed on younger adults. It tends to overestimate TDEE for older adults with significant muscle loss. Treat the result as a starting point and adjust based on 2-4 weeks of real-world tracking.