d•dailytoolbox

Calorie calculator

Estimate resting and daily maintenance energy.

Adults 18+. Estimates only; not a diet prescription.

What is this tool?

Estimate resting energy and an approximate daily maintenance figure from the inputs provided. The page makes the equation and activity assumption visible so you can understand why results change. It does not prescribe a calorie deficit or meal plan.

How to use it

  1. Read the input labels and limits below, then choose the operation that matches your task.
  2. Enter adult age, weight in kilograms and height in centimetres.
  3. Select the equation coefficient and the activity estimate that matches your intended calculation.
  4. Calculate, then review the resting and maintenance values separately.
  5. Check the result against the worked example or original file before copying, downloading or using it elsewhere.

Worked example

Changing the activity factor changes the maintenance estimate even when height, age and weight stay the same. That factor is a rough assumption, not a measurement of movement or exercise on a particular day.

Questions & limits

Uses Mifflin–St Jeor resting energy: 10 × kg + 6.25 × cm − 5 × age, then +5 for male or −161 for female. Maintenance is resting energy multiplied by the selected rough activity factor. Individual needs vary. Not for pregnancy, breastfeeding, or clinical nutrition decisions.

Original equation study

What does the maintenance estimate mean?

It estimates daily energy use using your inputs and selected activity factor. Actual needs vary. The result is an estimate for adults, not a personalized eating plan.

Is the result a target I must eat?

No. It is an equation estimate. Individual needs and medical circumstances may differ, and a qualified professional can help interpret it when making nutrition decisions.

Using estimates responsibly

These calculations depend on the measurements and assumptions you enter. Check the units and avoid interpreting a single number as a complete assessment. A result can be mathematically correct while still being unsuitable for your personal situation. The page explains the equation and its scope so you can understand what was calculated. It does not diagnose a condition, recommend treatment or replace individual advice. If the result will inform a health decision, discuss your circumstances with a qualified professional.

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Features & limits

Accepts adult ages 18–100, weight 20–500 kg and height 100–250 cm. Uses the Mifflin–St Jeor equation and an activity multiplier. These rough estimates do not account for every personal circumstance and are not a prescription for pregnancy, breastfeeding or clinical nutrition.

This tool runs in a modern browser with JavaScript enabled. It processes the values or files you enter on your device. Loading the site still makes hosting requests. The separate contact form sends messages to the administrator; it is not part of tool processing. Keep an original copy and inspect any exported result before relying on it.

Frequently asked questions

Is the result a target I must eat?

No. It is an equation estimate. Individual needs and medical circumstances may differ, and a qualified professional can help interpret it when making nutrition decisions.

What can I use calorie calculator for?

Estimate resting energy and an approximate daily maintenance figure from the inputs provided. The page makes the equation and activity assumption visible so you can understand why results change. It does not prescribe a calorie deficit or meal plan.

What are this tool’s limits?

Accepts adult ages 18–100, weight 20–500 kg and height 100–250 cm. Uses the Mifflin–St Jeor equation and an activity multiplier. These rough estimates do not account for every personal circumstance and are not a prescription for pregnancy, breastfeeding or clinical nutrition.

Can I try a worked example?

Changing the activity factor changes the maintenance estimate even when height, age and weight stay the same. That factor is a rough assumption, not a measurement of movement or exercise on a particular day.

Do I need an account or upload my input?

No tool account is required. Processing takes place in your browser; your tool input is not sent to the contact inbox. Use a trusted device, keep your originals and avoid including passwords or private credentials in examples.

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