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Ideal Weight Calculator

Devine formula for ideal body weight. Free online Ideal Weight Calculator. Calculate ideal weight online — fast, accurate, mobile-friendly, no signup needed.

Ideal weight (kg)
70.7

Derivation

  1. ├── 01Givenh = 69, sex = male
  2. ├── 02Formula{let t=e.h;return"male"===e.sex?50+2.3 × (t-60):45.5+2.3 × (t-60)}
  3. ├── 03Substitute{let t=e.69;return"male"===e.'male'?50+2.3 × (t-60):45.5+2.3 × (t-60)}
  4. └── 04Compute Ideal weight (kg)70.7
Did you know?

The US Navy body-fat equation (1984) uses only neck, waist (and hip for women) — developed so recruiters could assess fitness without specialist equipment.

§01What is

Understanding the Ideal Weight Calculator

The Ideal Weight Calculator computes Ideal weight (kg) from 2 inputs: height (in), sex. Devine formula for ideal body weight.

Health metrics give us objective checkpoints against a body that can feel unreliable. Used alongside professional guidance — not in place of it — these numbers help you track progress and spot trends that matter. The Ideal Weight Calculator sits in that toolkit — it devine formula for ideal body weight. Enter your numbers above and the result updates instantly; every step of the math is shown in the Derivation panel so you can see exactly how the answer was reached.

§02The Formula

How it’s calculated

{let t=e.h;return"male"===e.sex?50+2.3 × (t-60):45.5+2.3 × (t-60)}

Where

h
Height (in)
sex
Sex — one of: male, female
§03Practical Example

Step-by-step walkthrough

Scenario

Apply the formula to a realistic set of inputs: Height (in) = 69, Sex = male.

  1. 01Start by noting the input — Height (in): 69.
  2. 02Start by noting the input — Sex: male (a category, not a number).
  3. 03Substitute these values into the formula: {let t=e.h;return"male"===e.sex?50+2.3 × (t-60):45.5+2.3 × (t-60)}
  4. 04Compute Ideal weight (kg): the calculator returns 70.7.
  5. 05Cross-check the answer by opening the Derivation panel above — every line of math is shown so you can follow the computation end-to-end.
§04Variants

Common Ideal Weight Problems

The formula gets rearranged depending on which variable you need. Here are the patterns you’ll run into in the real world — find the one that matches your problem and follow the worked steps.

01 · PATTERN

Height (in) halved

h = 34.5 (from 69)

Keep every other input at its default and halve the height (in). See how ideal weight (kg) responds.

  1. 01New Height (in): 34.5
  2. 02Baseline Ideal weight (kg): 70.7
  3. 03New Ideal weight (kg): -8.65
  4. 04Ideal weight (kg) decreases by 112.2% → use this sensitivity to plan for real-world variation.
02 · PATTERN

Height (in) doubled

h = 138 (from 69)

Keep every other input at its default and double the height (in). See how ideal weight (kg) responds.

  1. 01New Height (in): 138
  2. 02Baseline Ideal weight (kg): 70.7
  3. 03New Ideal weight (kg): 229.4
  4. 04Ideal weight (kg) increases by 224.5% → use this sensitivity to plan for real-world variation.
§05FAQ

Frequently asked questions

Yes. The calculator implements the standard formula as documented and returns exact floating-point results. No approximations are used unless noted in the formula.
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