Aisha K.
Mar 12, 2026
Clean layout and the results update instantly. Exactly what I needed for a quick planning check.
Unit Converters
Body Mass Index: Metric to Imperial Units
BMI = kg / (m)² = 703 × lb / (in)².
BMI = kg / m² = 703 × lb / in². Same index, two unit systems. It does not know muscle, bone, or why a powerlifter and a couch get the same number. Categories are public-health bins, not a diagnosis.
Both unit systems
Metric BMI
24.2
Imperial 24.1. Not a diagnosis.
Plain-English guide
Terms & how it works
Confused by a field? Read the short definitions here while you use the tool.
Weight and height
The “Weight and height” value used in this tool’s formula. Adjust it to see results update live.
Height (cm)
The “Height (cm)” value used in this tool’s formula. Adjust it to see results update live.
Weight (lb)
The “Weight (lb)” value used in this tool’s formula. Adjust it to see results update live.
Height (in)
The “Height (in)” value used in this tool’s formula. Adjust it to see results update live.
How this calculator works
BMI = kg / m² = 703 × lb / in². Same index, two unit systems. It does not know muscle, bone, or why a powerlifter and a couch get the same number. Categories are public-health bins, not a diagnosis. BMI = kg / (m)² = 703 × lb / (in)². Example: 70 kg at 170 cm → 24.2. 154 lb at 67 in → 24.1.
BMI = kg / (m)² = 703 × lb / (in)².
Example: 70 kg at 170 cm → 24.2. 154 lb at 67 in → 24.1.
When to use this BMI Metric and Imperial
Common use cases
- BMI = kg / m² = 703 × lb / in². Same index, two unit systems. It does not know muscle, bone, or why a powerlifter and a couch get the same number. Categories are public-health bins, not a diagnosis.
- Sanity-check with this case: 70 kg at 170 cm → 24.2. 154 lb at 67 in → 24.1.
- The relationship is: BMI = kg / (m)² = 703 × lb / (in)².
Localized examples
- Unit Converters: the example on this page uses the same formula as the widget.
What you get
- Fields: Weight and height, Height (cm), Weight (lb), Height (in)
- BMI = kg / (m)² = 703 × lb / (in)².
- Example on the page: 70 kg at 170 cm → 24.2. 154 lb at 67 in → 24.1.
How to Convert BMI Metric and Imperial Step-by-Step
- 1Enter Weight and height, Height (cm), Weight (lb), then the remaining fields. Use the values you have, not a catalog average, unless that is all you know.
- 2BMI = kg / (m)² = 703 × lb / (in)².
- 3Worked case: 70 kg at 170 cm → 24.2. 154 lb at 67 in → 24.1.
- 4Check which dictionary the other person is using — US or UK, decimal or 1,024 — then trust the number.
Governing formula
BMI = kg / (m)² = 703 × lb / (in)².
70 kg at 170 cm → 24.2. 154 lb at 67 in → 24.1.
Example: set Weight and height = 70, Height (cm) = 170, Weight (lb) = 154, then read the result.
Variable definitions
- value
Weight and height
The “Weight and height” field. Default 70; typical range 35–200.
- cm
Height (cm)
The “Height (cm)” field. Default 170; typical range 120–220.
- lb
Weight (lb)
The “Weight (lb)” field. Default 154; typical range 70–400.
- inches
Height (in)
The “Height (in)” field. Default 67; typical range 48–84.
- The conversion (BMI = kg / (m)² = 703 × lb / (in)².) does not pick US vs UK gallons, SI vs binary megabytes, or Mach at altitude for you. Read the footnote on the page.
- Nothing here is uploaded for the calculation itself.
Frequently Asked Questions
BMI over-flags muscle. Waist or a clinician is more honest.
Related calculators
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- Carats to GramsA metric carat is 0.2 g, defined in 1907 so jewelers would stop arguing. A 1 ct diamond is 0.2 g — the size you see is cut, not this mass. Gold “karat” (purity) is a different word on purpose.
- Carats to MilligramsThe metric carat is exactly 200 mg (0.2 g) since 1907. A 1 ct diamond is 200 mg. Jewelers still cut “points” (0.01 ct = 2 mg). This is not a gold-karat purity scale.
- Cups to MillilitersUS customary cup is 240 mL in nutrition labels and 236.6 mL in the true fluid-cup (8 fl oz). This page uses the 8 fl oz cup (236.6 mL). A “metric cup” in Australia is 250 mL. If the cake falls, check which cup the author owned.
- GPM to L/min1 US gpm = 3.785 L/min. A 2.5 gpm showerhead is 9.5 L/min. UK gallons are larger. Fixture laws care about the number on the aerator, not the pipe diameter.
- Horsepower to WattsMechanical horsepower is 745.7 W. A 150 hp engine is 112 kW. Metric PS is 735.5 W — close, not the same. Peak dyno hp is not what the wheels see. Convert the number on the spec sheet, then stay humble.
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Reviews & Ratings
See what others think about this tool, then leave your own rating to help improve CalculioHub.
4.8
out of 5.0
4 reviews
Daniel R.
Feb 28, 2026
Very usable on mobile. Would love a save/export option later, but the math feels solid.
Priya S.
Feb 3, 2026
The FAQ section answered my questions before I even had to search. Smooth dark mode too.
Marcus L.
Jan 19, 2026
Simple inputs, clear outputs. This replaced three bookmarks I used to juggle.
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