BMI Calculator
Enter height and weight for your BMI, WHO category, and healthy weight range.
Healthy weight for your height:
For information only — not medical advice. Talk to a healthcare professional about what is healthy for you.
How to use the BMI calculator
- Pick your units. Metric (centimeters and kilograms) or imperial (feet, inches, and pounds).
- Enter height and weight. Use your morning measurements for the most consistent number.
- Press Calculate BMI. Your index appears with its WHO category and a gauge showing where you land.
- Check the healthy range. Below the gauge, see the weight range that would put you between BMI 18.5 and 24.9 at your height.
Frequently asked questions
How is BMI calculated?
Weight divided by height squared: kilograms per square meter in metric, or (pounds per square inch) times 703 in imperial. Both formulas give the same index.
What are the BMI categories?
The WHO bands: under 18.5 is underweight, 18.5 to 24.9 is the healthy range, 25 to 29.9 is overweight, and 30 or above is obese.
Is BMI accurate for athletes or muscular people?
Not always — BMI cannot tell muscle from fat, so very muscular people can score as overweight. It is a screening tool, not a diagnosis; a professional can assess body composition properly.
How is the healthy weight range worked out?
By rearranging the BMI formula: the weights that would put you between BMI 18.5 and 24.9 at your height.
Is this medical advice?
No. This calculator is for information only and is not medical advice. Talk to a healthcare professional about what is healthy for you.
More from the codex
BMI Calculator
BMI, WHO category gauge, and healthy weight range.
Citation Generator
Accurate citations in APA 7th, MLA 9th, Chicago, and Harvard. Websites, books, journals, YouTube — with URL, DOI, and ISBN auto-lookup.
Open tool → LiveGPA Calculator
Semester and cumulative GPA with weighted scales, plus a planner that tells you exactly what you need to hit your target.
Open tool → LiveWord Counter
Count words and estimate reading time instantly.
Open tool → LiveGrade Calculator
“What do I need on my final?” — answered.
Open tool → LivePomodoro Timer
Focus sessions with clean, simple timing.
Open tool → LiveRandom Student Picker
Fair, no-repeat classroom picker for teachers.
Open tool → LiveScientific Calculator
Trig, logs, powers, factorials — full keypad.
Open tool → LivePercentage Calculator
Percent of, percent change, increase/decrease.
Open tool → LiveUnit Converter
Length, weight, temperature, and more.
Open tool → LiveTyping Speed Test
Measure your words per minute and accuracy.
Open tool → LiveStudent Budget Calculator
Plan spending on a student budget.
Open tool → LiveAttendance Calculator
How many classes can you miss and still pass?
Open tool → LiveTip Calculator
Split the bill fairly in seconds.
Open tool → LivePassword Generator
Strong, random passwords on demand.
Open tool → LiveCase Converter
UPPER, lower, Title Case and more.
Open tool → LiveCountdown Timer
Count down to exams, deadlines, events.
Open tool → LiveFlashcard Maker
Spaced-repetition flashcards for any subject.
Open tool → LiveResume Builder
Clean templates, export to PDF.
Open tool → LivePDF Tools
Merge and compress PDFs for submissions.
Open tool → LiveTimetable Maker
Build your weekly class schedule.
Open tool → LiveText-to-Speech Reader
Hear your essay read aloud for proofreading.
Open tool → LiveAge Calculator
How old are you, exactly? Years, months, days.
Open tool → LiveDate Calculator
Days between dates, plus date arithmetic.
Open tool → LiveLoan Calculator
Monthly payments, interest, amortization table.
Open tool → LiveCompound Interest Calculator
Project savings growth with contributions.
Open tool → LiveQR Code Generator
Free QR codes for URLs and text. PNG download.
Open tool → LiveJSON Formatter
Validate, format, and minify JSON.
Open tool → LiveLorem Ipsum Generator
Placeholder text by paragraph or word.
Open tool → LivePeriodic Table
Interactive table of all 118 elements.
Open tool → LiveTime Zone Converter
Convert times across zones; plan meetings.
Open tool → LiveColor Picker
Hex/RGB/HSL converter, palettes, contrast checker.
Open tool → LiveRandom Number Generator
Random numbers, dice, coin flip, shuffler.
Open tool → LiveStopwatch
Precision stopwatch with lap times.
Open tool → LiveBase64 Encoder
Encode and decode Base64, URL-safe too.
Open tool →Support the codex
This tool is free, with no account and no ads. If it saved you some time, consider supporting the indie dev behind it.