BMI Calculator — Free & Easy Body Mass Index Tool

Quickly calculate your BMI and see your weight category and recommended weight range. Supports metric and imperial units.

Enter your measurements
Choose units, enter height and weight, then calculate to see your BMI and health category.
Measurement Unit
Choose metric (cm/kg) or imperial (ft/in/lbs). The calculator will convert values as needed.
Height 170 cm
cm
ft
in
Enter your height. If using imperial units, fill feet and inches separately.
Weight 70 kg
kg
lbs
Enter your current weight. The tool will calculate BMI and show category and an ideal weight range.
Your BMI Results
BMI value, category, and recommended weight range based on your inputs.

0.0 BMI

Normal Weight

Underweight
< 18.5
Normal
18.5 - 24.9
Overweight
25.0 - 29.9
Obese
≥ 30.0
Health Information
Understanding your BMI results and next steps

Current Status

Normal Weight Range

Ideal Weight Range

54.4 - 73.4 kg

Note: BMI is a screening tool and does not measure body fat directly. For personalized health advice, consult a healthcare professional.

About BMI Calculation

Formula: BMI = weight (kg) / height (m)² (or equivalent using imperial units).

Categories: Underweight (< 18.5), Normal (18.5–24.9), Overweight (25.0–29.9), Obese (≥ 30.0).

Limitations: BMI is a general screening tool and may not reflect body composition. Athletes, older adults, and people with high muscle mass should interpret results cautiously.

If you have concerns about weight or health, consult a healthcare provider for a full assessment.

How to Use the BMI Calculator
  1. Select unit system: Choose metric (cm/kg) or imperial (ft/in, lbs).
  2. Enter height and weight: Input your measurements in the selected units.
  3. Calculate: Click "Calculate BMI" to see your BMI value, category, and ideal weight range.

Example: 170 cm and 70 kg gives a BMI of ~24.2, which falls in the 'Normal' range. Use the ideal weight range shown to understand healthy target weights based on BMI thresholds.

Use this tool for quick self-assessment, tracking weight changes, or preparing information for a healthcare visit.

Frequently Asked Questions (FAQ)
Is BMI a reliable measure of health?

BMI is a useful screening tool that estimates body fat for most adults, but it doesn't directly measure body composition. For personalized health advice, consult a healthcare professional.

How is ideal weight range calculated?

Ideal weight range here is an estimate based on BMI thresholds (e.g., BMI 18.5–24.9). It provides a target range rather than a precise medical recommendation.

Can I use this if I have a high muscle mass?

People with high muscle mass may have higher BMI without excess body fat. Consider additional measures like body fat percentage or waist-to-hip ratio for more accurate assessment.

Is my data saved?

No — this tool runs in your browser and does not store or transmit your input to any server.