Protein & Calorie Needs Calculator (Mifflin-St Jeor, ISSN)

Calculate BMR with the Mifflin-St Jeor equation, a daily calorie range by activity level from the FAO/WHO/UNU report, and the 1.4–2.0 g/kg protein range from the ISSN position stand.

Equations

• Men: BMR = 10 × weight(kg) + 6.25 × height(cm) − 5 × age + 5
• Women: BMR = 10 × weight(kg) + 6.25 × height(cm) − 5 × age − 161
• Daily energy = BMR × physical activity level (PAL), as a range.
• Protein = weight × 1.4 to 2.0 g/kg/day for exercising individuals (ISSN).

Upper PAL value per category

Methodology

Everything runs in your browser; we store nothing. Calories are rounded to the nearest 10.

Sources

• Mifflin MD, St Jeor ST et al. Am J Clin Nutr 1990;51(2):241-7
• Jäger R et al. ISSN Position Stand: protein and exercise. JISSN 2017;14:20
• FAO/WHO/UNU. Human energy requirements (2004)

Checked: 2026-10-22

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<a href="https://fitdealsarabia.com/en/tools/protein-calorie-calculator/">Protein & Calorie Needs Calculator (Mifflin-St Jeor, ISSN)</a> — FitDeals Arabia

FAQ

Is this medical advice?

No. These are estimates from published equations. Ask a doctor or dietitian, especially if pregnant or with chronic conditions.

Why a range, not one number?

The FAO/WHO/UNU activity levels are ranges, and so is the ISSN protein recommendation. One number would imply false precision.

Where does 0.8 g/kg come from?

It is the general adult RDA, cited by the ISSN position stand as a comparison point.