---
title: "Discussion on \"Building a BMI Calculator in TypeScript — Imperial and Metric Formulas, WHO Classification, and Reverse-BMI\" | Hashnode"
description: "Discussion on \"Building a BMI Calculator in TypeScript — Imperial and Metric Formulas, WHO Classification, and Reverse-BMI\". The Formula Isn't the Hard Part\nBMI is simple math. The formula is:\nMetric:   BMI = weight (kg) / height (m)²\nImperial: BMI = weight (lbs) / height (in)² × 703\nThe tricky parts are:\n\nImperial height input — users want feet + inches, not total inches\n..."
url: "https://hashnode.com/posts/building-a-bmi-calculator-in-typescript-imperial-and-metric-formulas-who-classification-and-reverse-bmi/6a02a744c0c8f50de25947e3"
---

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# [Building a BMI Calculator in TypeScript — Imperial and Metric Formulas, WHO Classification, and Reverse-BMI](https://ultimatetools.hashnode.dev/building-a-bmi-calculator-in-typescript-imperial-and-metric-formulas-who-classification-and-reverse-bmi?utm_source=hashnode&utm_medium=feed)

The Formula Isn't the Hard Part BMI is simple math. The formula is: Metric: BMI = weight (kg) / height (m)² Imperial: BMI = weight (lbs) / height (in)² × 703 The tricky parts are: Imperial height input — users want feet + inches, not total inches ...

May 12 · 5 min read · ultimatetools.hashnode.dev  
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