# FitCalcHub: Free Health & Fitness Calculators

- Link: https://nohas.es/fitcalchub-free-health-fitness-calculators/
- Published: 2026-10-26T22:18:29+00:00
- Author: nohas.es Editorial Team

**FitCalcHub by NOHAS** · Free, simple health and fitness tools

## Free Health & Fitness Calculators

Use these calculators to explore common health and fitness estimates: adult body
mass index (BMI), basal metabolic rate (BMR), and approximate daily energy needs.
Enter your details below to see an instant result without creating an account.

**Important:** These tools provide general estimates for adults aged 18 and over.
They do not diagnose a condition or replace advice from a doctor, registered dietitian
or pharmacist. Results can be less useful during pregnancy, for athletes with high
muscle mass, and for people with certain medical conditions or a history of disordered
eating. Do not use calorie estimates as a substitute for individual medical advice.

## BMI Calculator

Calculate adult BMI from weight and height. BMI is a screening measure, not a direct
measurement of body fat or overall health.

Weight (kg)

Height (cm)

Common adult BMI screening ranges: below 18.5, underweight; 18.5–24.9, healthy-weight
range; 25.0–29.9, overweight; 30 or above, obesity range. These ranges may not fit
every individual.

## BMR Calculator

Estimate basal metabolic rate (BMR), the approximate energy the body uses at rest,
using the Mifflin–St Jeor equation.

Equation option

Age (years)

Weight (kg)

Height (cm)

Typical activity level

The equation uses a binary sex-specific constant and may not represent every person.
Activity multipliers are broad approximations, not measured energy expenditure.

## Daily Calorie Calculator

Estimate your approximate daily energy needs. The tool multiplies your estimated
BMR (Mifflin–St Jeor) by an activity factor to give a rough maintenance estimate,
with an optional gentle adjustment.

Equation option

Age (years)

Weight (kg)

Height (cm)

Typical activity level

Goal

Actual energy needs vary with health, medication, sleep, body composition, activity
and other factors. A calculator cannot determine a medically appropriate intake 
for you.

## How the calculators work

 * **BMI:** weight in kilograms divided by height in metres squared.
 * **BMR:** an estimate based on the Mifflin–St Jeor equation using age, height,
   weight and the selected equation option.
 * **Daily energy:** estimated BMR multiplied by an activity factor. This is a starting
   estimate, not a personalised nutrition plan.

## When to seek personalised advice

Speak with a healthcare professional before making significant changes to diet or
exercise if you are pregnant, have a chronic condition, take medicines that affect
weight or appetite, are under 18, are older or frail, or have concerns about eating
or body image. Seek urgent medical help for urgent symptoms rather than relying 
on a calculator.

## Sources and further reading

 * [US Centers for Disease Control and Prevention: Adult BMI Calculator](https://www.cdc.gov/bmi/adult-calculator/index.html)
 * [US National Institute of Diabetes and Digestive and Kidney Diseases: Body Weight Planner](https://www.niddk.nih.gov/bwp)

Content review note: This page provides general educational information. It should
be reviewed periodically against current public-health guidance.