When should I use this tool?

Use it when you need a quick extract workflow, want to verify output, or need a browser-based utility for health tasks.

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Yes. Try short representative inputs first, then move to larger or more complex cases once the output looks correct.

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Extended BMR Calculator (Mifflin / Schofield Multi-Formula Comparison)

Compare Mifflin-St Jeor, original and revised Harris-Benedict, Schofield (FAO/WHO/UNU), and Katch-McArdle BMR equations side by side with mean and spread in kcal/day. Not medical advice.

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2 examples

Male 30 y, 175 cm, 75 kg, LBM 60 → Mifflin 1698.8, Schofield 1749, Katch 1666

Five-formula comparison: Mifflin-St Jeor 1698.8, Harris-Benedict original 1770.8 (highest), Harris-Benedict revised 1762.7, Schofield 1749 (30–60 band), Katch-McArdle 1666 (lowest, from LBM). Mean 1729.4 kcal/day, spread 104.8 — a ~6% band across equations for the same person.

{"result":"Extended BMR: male, 75 kg, 175 cm, 30 y — Mifflin-St Jeor 1698.8 kcal/d; mean of 5 formulas 1729.4 kcal/d (range 1666–1770.8).","metadata":{"input":{"sex":"male","weightKg":75,"heightCm":175,"ageYears":30,"leanBodyMass":60},"result":{"formulas":{"mifflinStJeor":1698.8,"harrisBenedictOriginal":1770.8,"harrisBenedictRevised":1762.7,"schofieldFaoWhoUnu":1749,"katchMcardle":1666},"meanKcalDay":1729.4,"minKcalDay":1666,"maxKcalDay":1770.8,"spreadKcalDay":104.8,"model":"Mifflin 1990; Roza 1984; FAO/WHO/UNU 1985. Not medical advice."}}}

Female 45 y, 162 cm, 68 kg (no LBM) → 4 formulas, mean 1376.3 kcal/day

Without lean body mass the Katch-McArdle row is omitted: Mifflin-St Jeor 1306.5, Harris-Benedict original 1394.6, revised 1383.4, Schofield 1420.6 (highest, female 30–60 band). Mean 1376.3 kcal/day, spread 114.1 — Schofield runs high relative to Mifflin in this example.

{"result":"Extended BMR: female, 68 kg, 162 cm, 45 y — Mifflin-St Jeor 1306.5 kcal/d; mean of 4 formulas 1376.3 kcal/d (range 1306.5–1420.6).","metadata":{"input":{"sex":"female","weightKg":68,"heightCm":162,"ageYears":45},"result":{"formulas":{"mifflinStJeor":1306.5,"harrisBenedictOriginal":1394.6,"harrisBenedictRevised":1383.4,"schofieldFaoWhoUnu":1420.6},"meanKcalDay":1376.3,"minKcalDay":1306.5,"maxKcalDay":1420.6,"spreadKcalDay":114.1,"model":"Mifflin 1990; Roza 1984; FAO/WHO/UNU 1985. Not medical advice."}}}

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6 options

SettingsAdjust formats, ranges, numbers, and modes.6

SexselectRequiredSex used by the sex-specific equations.Weight (kg)numberRequiredBody weight in kilograms.Height (cm)numberRequiredHeight in centimeters.Age (years)numberRequiredAge in years (18–100).Lean Body Mass (kg, optional)numberOptionalOptional lean body mass in kg; enables the Katch-McArdle formula (370 + 21.6×LBM).Decimal PlacesnumberOptional

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Extended BMR Calculator (Mifflin / Schofield Multi-Formula Comparison)

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