CodeItBro

Body Weight Calculator

Track your BMI, healthy weight range, metabolism, and calorie needs using this accurate, mobile-ready body weight calculator.

Get a snapshot of your body metrics

Enter a few details to see your BMI, healthy weight range, daily calorie targets, and optional waist-to-height ratio. Everything runs on your device so nothing leaves your browser.

Units:

How It Works

The Body Weight Calculator runs entirely in your browser using JavaScript. Unlike other tools that send your data to a server, we process everything locally on your device. This guarantees 100% privacy and blazing fast speed.

  • No server interaction – data never leaves your device
  • Instant results since there is no network latency
  • Works offline once the page is loaded
  • Free to use with no usage limits

How to Use

1

Enter your details

Pick metric or imperial units, then add your gender, age, height, weight, and optional waist for extra insights.

2

Choose lifestyle

Select an activity level so we can estimate calorie needs that better match your daily routine.

3

Review your report

Tap Calculate to instantly see BMI, healthy weight range, BMR, maintenance calories, and guidance you can copy or share.

Example Usage

This sample shows how the calculator translates common stats into actionable BMI, weight range, and calorie guidance.

Input
Gender: Male Age: 32 Height: 178 cm Weight: 74 kg Activity: Moderate
Output
BMI: 23.4 (Normal) Healthy weight: 58.6 – 79.4 kg BMR: ~1710 kcal/day Maintenance: ~2650 kcal/day

Frequently Asked Questions

How accurate is this calculator?
The tool uses standard BMI categories plus the Mifflin-St Jeor formula for BMR, which is widely used in nutrition science. It is still an estimate and not a diagnosis.
What does the activity level change?
It multiplies your BMR by a factor that matches your typical movement so you get a realistic maintenance calorie range.
Can I use both metric and imperial?
Yes, switch units anytime. We sync the equivalent values for you and remember your preference on your next visit.

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The Body Weight Calculator is maintained by CodeItBro. We aim to provide the best free developer tools on the web. If you have feedback or suggestions, please visit our contact page.