How accurate is this estimate?

Mifflin-St Jeor is one of the more accurate published formulas, but any equation is an estimate — individual metabolism varies. Track your actual weight change over 2–3 weeks and adjust the target if needed.

Why ±500 calories for weight loss or gain?

A 500 kcal/day deficit or surplus corresponds to roughly 0.5 kg (1 lb) of body weight change per week, which is a commonly recommended sustainable pace.

What's the difference between BMR and TDEE?

BMR is the calories your body burns at complete rest, just to maintain basic functions. TDEE takes that baseline and scales it up by your activity level, giving a fuller picture of your actual daily calorie burn.

Should I always eat exactly my calculated target?

Treat it as a starting estimate rather than an exact number — actual needs vary by individual, so it's worth adjusting your target based on how your weight actually trends over a few weeks of consistent tracking.

Is a large calorie deficit better for faster results?

Not necessarily — very large deficits are harder to sustain and can affect energy levels and muscle retention. A moderate, sustainable deficit like the commonly recommended 500 kcal/day tends to produce more consistent long-term results than aggressive short-term cuts.

Health & Fitness Cluster

Calorie Calculator (TDEE)

Calculate daily calorie needs for maintaining, losing or gaining weight.

TL;DR: Calorie Calculator (TDEE) is a free, browser-based tool that lets you calculate daily calorie needs for maintaining, losing or gaining weight.

Sex

Age

Weight (kg)

Height (cm)

Activity level

Goal

Why Use This Calculator?

Calorie Calculator estimates daily caloric energy requirements for weight maintenance, healthy fat loss (mild, moderate, and aggressive caloric deficits), and lean muscle gain using the clinical Mifflin-St Jeor metabolic equation.

Getting Started with the Calorie Calculator (TDEE)

Enter Age, Sex, Height, and Current Weight.
Select your daily physical activity level (Sedentary, Lightly Active, Moderately Active, Very Active, Extra Active).
View your maintenance caloric baseline.
Review target daily calorie intake goals for fat loss (-300 to -500 kcal) or muscle gain (+250 to +500 kcal).

Mathematical Formula & Methodology

Here is the standard mathematical equation used to calculate this result accurately:

\text{Target Daily Calories} = \text{TDEE} \pm \text{Caloric Deficit / Surplus}

Formula Variables Explained:
Calculates daily caloric intake requirements for fat loss (300–500 kcal deficit), weight maintenance, or clean muscle growth (250–500 kcal surplus).

Step-by-Step Worked Example

To lose 1 lb of fat per week (~3,500 kcal deficit/week), subtract 500 kcal from a 2,500 kcal TDEE = 2,000 kcal target daily intake.

Pro Tips & Best Practices

Safe Weight Loss Rate: Aim for a moderate 300–500 kcal daily deficit to lose 0.5–1.0 lb of body fat per week without sacrificing lean muscle.
Honest Activity Selection: If you work a desk job, select 'Sedentary' even if you exercise 3 times a week, as daily NEAT (non-exercise activity) dominates burn.
Recalibrate As You Lose Weight: As body mass decreases, basal metabolic rate drops; recalculate your numbers every 5–10 lbs of weight loss.

Related Guides & Tutorials

Freelance Hourly Rate Calculator — Learn in-depth concepts, best practices, and expert tips.
Percentage Calculator Guide — Learn in-depth concepts, best practices, and expert tips.

100% Client-Side Privacy Guarantee

All processing runs locally inside your browser using JavaScript and HTML5 APIs. Your data, files, and inputs are never uploaded to any remote server. Complete privacy by design.

Frequently Asked Questions

: Mifflin-St Jeor is one of the more accurate published formulas, but any equation is an estimate — individual metabolism varies. Track your actual weight change over 2–3 weeks and adjust the target if needed.
: A 500 kcal/day deficit or surplus corresponds to roughly 0.5 kg (1 lb) of body weight change per week, which is a commonly recommended sustainable pace.
: BMR is the calories your body burns at complete rest, just to maintain basic functions. TDEE takes that baseline and scales it up by your activity level, giving a fuller picture of your actual daily calorie burn.
: Treat it as a starting estimate rather than an exact number — actual needs vary by individual, so it's worth adjusting your target based on how your weight actually trends over a few weeks of consistent tracking.
: Not necessarily — very large deficits are harder to sustain and can affect energy levels and muscle retention. A moderate, sustainable deficit like the commonly recommended 500 kcal/day tends to produce more consistent long-term results than aggressive short-term cuts.

Cite This Tool

Referencing this tool in a paper, article, or bibliography? Copy a ready-made citation below.

NexLove.org. (2026). Calorie Calculator (TDEE) [Software]. https://nexlove.org/tools/calorie-calculator.html

“Calorie Calculator (TDEE).” NexLove.org, 2026, nexlove.org/tools/calorie-calculator.html.

NexLove.org (2026) Calorie Calculator (TDEE). Available at: https://nexlove.org/tools/calorie-calculator.html (Accessed: 2026).

@misc{nexlove_calorie_calculator,
  title = {Calorie Calculator (TDEE)},
  author = {{NexLove.org}},
  year = {2026},
  url = {https://nexlove.org/tools/calorie-calculator.html}
}

Embed This Tool

Add the live Calorie Calculator (TDEE) tool to your own website with this snippet — it loads the real, working tool in an iframe, not a static screenshot.

<iframe src="https://nexlove.org/embed/calorie-calculator.html" width="100%" height="600" style="border:1px solid #e2e8f0;border-radius:12px" title="Calorie Calculator (TDEE) — NexLove.org" loading="lazy"></iframe>

Understanding the Calorie Calculator (TDEE)

This calculator provides instant, client-side computations designed for precision and ease of use.

Key Benefits

Instant Execution: No page reloads required. The math is calculated dynamically as you type.
Private & Secure: No financial, personal, or numerical data is transmitted. All calculations run in your browser's memory.

Disclaimer: While we strive for absolute accuracy, the Calorie Calculator (TDEE) should be used for informational purposes. Always verify critical calculations with a licensed professional where applicable.

Related Health & Fitness Calculators

Credit Card Payoff Calculator

Body Fat Calculator

Browse all Calculators