All Tools Verse
The best free online health and fitness calculators estimate body measurements and daily calorie needs, all in your browser with no sign-up. All Tools Verse has a set of free health calculators that run client-side, so nothing you enter is uploaded. This guide picks the best free tool for each task, from BMI to a daily calorie goal. These give general estimates and are not medical advice.
In this guide
Body measurements
To check body metrics, BMI Calculator gives your body mass index and the healthy range, Body Fat Calculator estimates body fat with the US Navy method, and Ideal Weight Calculator shows a healthy weight range for your height.
Calories and metabolism
To plan eating, Calorie Calculator sets a daily calorie goal for your target, and BMR Calculator finds your basal metabolic rate, the calories your body uses at rest.
Trusted alternatives
A fitness app can track these numbers over time along with activity, and a doctor or dietitian gives personal guidance. For a quick one off estimate, a focused browser calculator is fastest.
Popular free tools in this guide
Frequently asked questions
How do I calculate my BMI?
Enter your height and weight into BMI Calculator, and it returns your body mass index with the category it falls in, in your browser.
How many calories do I need a day?
Calorie Calculator estimates a daily target from your age, size, and activity, and BMR Calculator shows the calories your body uses at rest.
What is body fat percentage?
It is the share of your weight that is fat. Body Fat Calculator estimates it with the US Navy method from a few measurements.
Are these health calculators free and private?
Yes. Every tool is free with no account, and the math runs on your device, so nothing you enter is uploaded.
Are the results medical advice?
No. They are general estimates. For health decisions, speak with a doctor or a qualified professional.
This guide is part of our roundup of the best free online tools.