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title: "Calorie Needs Calculator | Numequo"
description: "Estimate daily energy needs using the Mifflin–St Jeor equation. Get a clear result with the formula, examples and useful explanations."
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[Numequo](https://www.numequo.com/) › [Health](https://www.numequo.com/health/) › [Nutrition and energy](https://www.numequo.com/health/nutrition-energy/)

# Calorie Needs Calculator

Estimate maintenance calories from age, sex, height, weight and activity.

## Input data

- **Equation profile** - type: choice; default: female; options: Female, Male
- **Age** - type: number; default: 30; min: 18; max: 120; step: 1
- **Weight (kg)** - type: number; default: 65; min: 20; max: 500; step: 0.1
- **Height (cm)** - type: number; default: 170; min: 100; max: 250; step: 0.1
- **Activity level** - type: choice; default: 1.375; options: Sedentary, Lightly active, Moderately active, Very active

## How it works

BMR uses the Mifflin–St Jeor equation, then multiplies it by an activity factor.

> This estimate is educational and is not medical advice.

## Quick examples

- **Female, 30, lightly active** - Equation profile: female, Age: 30, Weight (kg): 65, Height (cm): 170, Activity level: 1.375
- **Male, 35, moderately active** - Equation profile: male, Age: 35, Weight (kg): 80, Height (cm): 180, Activity level: 1.55
- **Female, 50, sedentary** - Equation profile: female, Age: 50, Weight (kg): 70, Height (cm): 165, Activity level: 1.2

## Understanding your result

Maintenance calories estimate the daily energy needed to keep body weight stable. Use the result as a starting point: actual needs vary with activity, metabolism and changes over time.

Last verified: 29 September 2026 (2026-09-29)

## Frequently asked questions

### What are maintenance calories?

They estimate the energy needed to keep body weight stable.

### How accurate is this estimate?

It is a population-based estimate; real needs can vary considerably.

### Does this apply to children?

No. This version is intended for adults aged 18 and over.

### Should I use this for a medical diet?

Seek advice from a qualified health professional for medical or nutritional care.

## Related calculators

- [Protein Needs Calculator](https://www.numequo.com/health/nutrition-energy/protein-needs-calculator/) - Estimate the EFSA population reference intake for protein from body weight and life stage.
- [BMI Calculator](https://www.numequo.com/health/body-metrics/bmi-calculator/) - Estimate adult body mass index in metric or imperial units.
- [Ideal Weight Calculator](https://www.numequo.com/health/body-metrics/ideal-weight-calculator/) - Compare four common height-based reference formulas.
- [Sleep Duration Calculator](https://www.numequo.com/health/sleep-recovery/sleep-duration-calculator/) - Calculate the elapsed time between bedtime and wake-up, including overnight sleep.
- [Waist-to-Hip Ratio Calculator](https://www.numequo.com/health/body-metrics/waist-to-hip-ratio-calculator/) - Calculate waist-to-hip ratio and compare it with general WHO reference thresholds.

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