Toolkit Shelf

Health Calculators

BMI Calculator

Use this BMI calculator to estimate body mass index, BMI category, and a healthy BMI weight range from height and weight.

Reviewed May 25, 2026EstimateFormula shown

Live calculator

BMI calculator

BMI25.8

Category: Overweight. BMI is a screening number, not a diagnosis.

Healthy BMI range129 - 174 lb

Approximate weight range for BMI 18.5 to 24.9 at this height.

Height70 inches

Used with weight to calculate BMI using the standard US formula.

Formula

BMI formula

BMI = weight in pounds / height in inches^2 x 703

BMI is a screening measure and does not directly measure body fat or health.

How to use

Steps

  1. Enter weight in pounds.
  2. Enter height in feet and inches.
  3. Read the BMI number and category.
  4. Use the healthy range as a broad reference, not a medical diagnosis.

Example

Sample calculation

Weight180 lb
Height5 ft 10 in
BMI25.8

Calculator use

Best for

  • Quick bmi from weight, height feet and height inches.
  • Wellness, nutrition, pregnancy, or fitness planning when a rough estimate is enough.
  • Scenario comparisons before changing calorie, macro, or body-measurement assumptions.
  • Planning alongside professional medical or nutrition advice, not as a diagnosis.

Before relying on it

Check first

  • Entering weight, height feet and height inches from different time periods or scenarios.
  • Treating a calculator result as medical advice or a diagnosis.
  • Using stale body, activity, pregnancy, or nutrition inputs when your situation has changed.
  • Ignoring context such as age, medication, training status, medical history, or professional guidance.

Benchmarks

How to read the result

The calculator is a decision aid, not a fixed rule. Use the output to compare scenarios and document your assumptions.

Under 18.5Underweight

A low BMI can be worth discussing with a qualified professional.

18.5 - 24.9Healthy range

Often used as the general adult BMI reference range.

25+Above range

BMI does not account for muscle mass, body composition, age, or pregnancy.

Calculator accuracy

Methodology and assumptions

The formula, inputs, example, and limitations are shown so the result is checkable, not just a number in a box.

Formula

BMI = weight in pounds / height in inches^2 x 703

Inputs used

Weight, Height feet, Height inches

Limitations

Results are estimates for quick planning and should be checked before important financial, legal, tax, health, or business decisions.

Last reviewed

May 25, 2026

Cite this page

Toolkit Shelf. BMI Calculator. Retrieved May 25, 2026, from https://toolkitshelf.com/tools/bmi-calculator

FAQ

Common questions

What is BMI?

BMI stands for body mass index. It compares weight with height to produce a screening number.

Is BMI a medical diagnosis?

No. BMI is a broad screening estimate and should not replace medical advice or a full health assessment.

Does BMI work for athletes?

BMI can be misleading for muscular people because it does not distinguish muscle from fat.