CalculationTime

Ideal Body Weight Calculator

Estimate ideal body weight using Devine and Hamwi-style adult formulas, with BMI-range cross-checks.

Live math canvas

Your numbers, formula and explanation together

Ideal Body Weight Calculator: 73.2 kg. Devine estimate for 178 cm is 73.2 kg. BMI 18.5-24.9 range: 58.6-78.9 kg.

Formula applied

The exact method behind this answer

CalculationTime keeps the method visible so the number can be checked instead of blindly trusted.

Devine IBW kg = 50 + 2.3 × inches over 5 ft for male formula, or 45.5 + 2.3 × inches over 5 ft for female formula.
  1. Apply the formulaDevine IBW kg = 50 + 2.3 × inches over 5 ft for male formula, or 45.5 + 2.3 × inches over 5 ft for female formula.73.2 kgDevine estimate for 178 cm is 73.2 kg. BMI 18.5-24.9 range: 58.6-78.9 kg.

Your live breakdown

Current inputs in the calculation

These values come from the controls above and update when the calculator changes.

Formula sex
Male formula
Height
178 cm

Resulting answer

73.2 kg

Devine estimate for 178 cm is 73.2 kg. BMI 18.5-24.9 range: 58.6-78.9 kg.

Answer
73.2 kg
Live support
Devine estimate for 178 cm is 73.2 kg. BMI 18.5-24.9 range: 58.6-78.9 kg.

Assumptions used

What this answer assumes

The visible assumptions define the boundary of this calculation.

  • Adult screening formulas only.
  • Body composition, ethnicity, age, pregnancy, athlete status and clinical needs are not captured.
  • This is not a diagnosis or prescription.

Master’s Tip

How to use the result well

Master’s Tip: compare IBW against a healthy BMI range instead of treating one formula as a perfect target.

Printable record

What belongs in the saved calculation

Save the inputs, result, formula, assumptions, page URL and date together so the calculation can be reviewed later.

Formula sex
Male formula
Height
178 cm

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Explain it like I'm 12

The ideal body weight calculator converts height to inches over five feet, applies adult IBW formulas, and cross-checks the result against the BMI 18.5-24.9 range.

Formula

Devine IBW kg = 50 + 2.3 × inches over 5 ft for male formula, or 45.5 + 2.3 × inches over 5 ft for female formula.

Worked example

A 178 cm adult is about 10.1 inches over 5 ft. Male Devine IBW is 50 + 2.3×10.1 = about 73.2 kg.

Professional note

Master’s Tip: compare IBW against a healthy BMI range instead of treating one formula as a perfect target.

Regional and unit assumptions

Adult health education estimate using metric height.

Assumptions and limitations

Methodology & Accuracy

How this calculator is checked

CalculationTime pages are built around visible arithmetic: the formula, assumptions, worked example and practical limitations are shown so the result can be checked rather than simply trusted.

Formula used

Devine IBW kg = 50 + 2.3 × inches over 5 ft for male formula, or 45.5 + 2.3 × inches over 5 ft for female formula.

Standard or basis

Adult health education estimate using metric height.

Where a calculator follows a named legal, trade or industry standard, that standard is cited visibly. Otherwise the page uses transparent general arithmetic and states its limits.

Master's Tip

Master’s Tip: compare IBW against a healthy BMI range instead of treating one formula as a perfect target.

Questions

Is ideal body weight medically exact?

No. It is a formula estimate and should not replace clinical assessment.

Why show a BMI range too?

A range is usually more honest than a single target because healthy body size varies.