How much can exercise raise BMR after 40?

Resistance training that adds 2 kg of lean mass raises BMR by roughly 20–30 kcal/day directly, plus hundreds more from EPOC (afterburn) and higher NEAT. See Chapter 7: Exercise Physiology.

What protein do I need after 40?

At least 1.2 g/kg, and 1.6–2.0 g/kg if you train or are in a calorie deficit. Older adults also benefit from higher protein per meal (30–40 g) to overcome anabolic resistance.

BMR Calculator for Adults Over 40

After 40, BMR drops modestly — but the bigger driver of weight gain is loss of lean mass, not a broken metabolism. This calculator gives your accurate, age-adjusted BMR and explains how to keep it from sliding further.

Written by Marcus Reed, CISSN· Certified Sports Nutritionist (ISSN)

Medically reviewed by Dr. Amara Johnson, MD

Last reviewed April 20, 2026

5 min read

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Key Facts: BMR Calculator for Adults Over 40

✓BMR falls ~1–2% per decade after 20, mostly from muscle loss
✓Sarcopenia accelerates after 40 without resistance training
✓30–45 minutes of strength work 2–3×/week reverses most of the decline
✓Protein requirements rise with age — aim for 1.2–1.6 g/kg

Special Considerations for Over 40

⚡Prioritise strength training over cardio for metabolic preservation
⚡Higher protein (1.6–2.0 g/kg) is even more important after 40
⚡Recovery takes longer — allow 48h between sessions on the same muscles
⚡Stalled loss after 40? Check thyroid and iron before blaming metabolism

BMR Calculator for Adults Over 40: Frequently Asked Questions

A 2021 Science paper (Pontzer et al.) showed BMR is remarkably stable from age 20 to 60 — the real decline accelerates after 60. Most 'slow metabolism after 40' is actually muscle loss and reduced NEAT.

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Medical Disclaimer: This calculator provides estimates based on population-level research formulas. Individual results may vary. Consult a healthcare professional before starting any diet or exercise program. This tool is not a substitute for professional medical advice.