Health
Calculator for body fat
Use BMI, age and sex take estimate body-fat percentage with the Deurenberg population equation.
Add to workspaceYour numbers
Result dey update as you type; no Calculate button dey. All calculation dey run inside your browser.
Body fat wey we estimate
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How your result break down
| Measure | Value wey e get |
|---|---|
| BMI (input for the equation) | — |
| Body fat wey we estimate | — |
| Fat mass wey the estimate imply | — |
| Lean mass wey the estimate imply | — |
| Other sex, same BMI and age | — |
Compare your estimate with the other sex value
Dem scale the bars against the bigger value. Na only the 10.8-point sex term differ between the bars.
Formula
First BMI = weight (kg) ÷ height² (m²). Then estimated body fat % = 1.2 × BMI + 0.23 × age − 10.8 × sex variable − 5.4; di sex variable na 1 for male and 0 for female. Na di Deurenberg equation be dis.
Example wey show the calculation
Weight 65 kg, height 170 cm, age 30, female: BMI = 65 ÷ 1.70² = 22.5. Di body fat % = 1.2 × 22.49 + 0.23 × 30 − 0 − 5.4 = 26.99 + 6.9 − 5.4 = 28.5%. Di fat mass wey dis imply na 65 × 0.285 = 18.5 kg, and lean mass na 46.5 kg. With di male sex term, di same inputs give 17.7%. Use Reset example above to reproduce dis result.
Where e fit work and limits
This no be direct body-composition measurement: no skinfold, scan, or weighing method involved, and equation only recombine BMI, age, and sex. E fit inaccurate for athletes, older adults, and many body types, because two people with same BMI and age fit carry very different amounts of muscle and fat. Fat-mass and lean-mass figures na just percentage wey dem apply to entered weight, no be separately measured quantities.
Deurenberg et al. (1991): equation to estimate adult body fat
Questions wey people dey ask often
Na the same as body-fat scan be this?
No. Scan or skinfold test dey measure body directly; this page only apply population equation to BMI, age, and sex.
Why result dey change with sex?
Equation dey subtract 10.8 points for men, wey reflect average differences for population wey dem fit am to. Na group adjustment, no be measurement of individual.
Why e fit wrong for athletes?
Because BMI no fit tell muscle from fat. Muscular person fit get high BMI — and therefore high estimated body fat — while e carry small fat.
Wetin fat mass and lean mass mean here?
Na estimated percentage wey dem apply to your entered weight (fat mass = weight × percentage; lean mass = the rest). Dem no be separately measured.
Una dey store my data?
No. This calculation dey run locally inside your browser; values wey you enter no dey reach any CalcMintly database.
This estimate dey work for children?
No. Equation na adult population formula and dem no validate am for children.
Other tools wey relate to dis
- Calculator for BMI — BMI value wey this equation start with
- Calculator for BMR — resting energy use from the same inputs
- Calculator for ideal-weight reference — weight reference wey depend on height
Results na estimates only and no constitute professional or medical advice.