TDEE Calculator — Free, Instant Results

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TDEE Calculator – Free Daily Calorie & Macro Calculator Online

What Is TDEE — And Why It’s the Only Number You Need

TDEE stands for Total Daily Energy Expenditure — the total number of calories your body burns every 24 hours. It’s not an estimate of your gym session. It’s everything: breathing, digesting, walking to the fridge, and every rep you lift.

Think of it as your body’s personal break-even number. Eat below it and you lose weight. Eat above it and you gain. Eat at it and you maintain. No diet plan, no macro system, no fitness app can work without this number as its foundation.

That’s why knowing your TDEE isn’t optional — it’s the starting point for every goal.

How the TDEE Calculator Works (3 Steps)

Getting your result takes less than 60 seconds:

Step 1 — Enter your details: Age, gender, height, and current weight.

Step 2 — Select your activity level: Be honest here. “Mostly Sitting” (desk job, little movement) gives a very different number than “Active Day” (on your feet most of the day). Picking the wrong level is the 1 reason people get inaccurate results.

Step 3 — Choose your goal: Whether you want to lose fat, build muscle, or hit maintenance — we calculate your exact daily calorie target and macro split.

Our calculator uses the Mifflin-St Jeor equation, the formula rated most accurate for estimating resting metabolic rate in healthy adults. No outdated Harris-Benedict shortcuts

What Makes Up Your TDEE?

Your daily calorie burn isn’t just your workouts. It’s made up of four components:

BMR (Basal Metabolic Rate) The calories your body burns at complete rest — just to keep your heart beating, lungs breathing, and organs functioning. This accounts for 60–70% of your total daily burn. Even on a rest day, you’re burning hundreds of calories just existing.

NEAT (Non-Exercise Activity Thermogenesis) Every movement that isn’t a workout: walking to the car, standing at your desk, cooking dinner, fidgeting. NEAT is wildly underestimated — it can vary by up to 2,000 calories per day between two people of the same size, based purely on lifestyle.

EAT (Exercise Activity Thermogenesis) The calories burned during intentional exercise — running, lifting, cycling, classes. Despite feeling significant, EAT typically accounts for only 5–10% of total daily burn for most people.

TEF (Thermic Effect of Food) Your body actually burns calories digesting food. Protein has the highest thermic effect (~25–30% of its calories burned during digestion), which is one reason high-protein diets support weight loss even at the same calorie intake.

How to Use Your TDEE to Reach Your Goal

Calorie Deficit for Weight Loss

To lose fat, eat below your TDEE. A moderate deficit of 300–500 calories per day produces roughly 0.5–1 lb of fat loss per week — sustainable, metabolically safe, and effective. Going below 20% of your TDEE consistently will trigger metabolic adaptation and muscle loss. Don’t go there.

Use our calorie deficit calculator (built into the results above) to find your exact target without the math.

Calorie Surplus for Muscle Gain

To build muscle, eat above your TDEE. A lean bulk sits at 200–350 calories above maintenance, paired with progressive resistance training. More than that and you’re gaining fat alongside muscle. Less than that and your body won’t have the raw material to build.

Maintenance Calories

Eat exactly at your TDEE to hold your current weight. This is the ideal phase after a long cut — giving your metabolism, hormones, and performance a chance to reset before the next goal.

TDEE Calculator for Women vs Men — Does It Differ?

Yes — significantly. The Mifflin-St Jeor equation calculates separate estimates for men and women because of genuine physiological differences:

• Men typically have more lean muscle mass, which raises BMR
• Women have higher body fat percentages relative to total body weight, which lowers BMR
• Hormonal cycles can cause daily fluctuations of 50–150 calories in women’s actual burn

This is why our calculator asks for your gender — not to be reductive, but because the biology is real and ignoring it produces inaccurate numbers. If you’re a woman and your number looks “low,” it’s the formula being honest, not broken.

Why Your TDEE Estimate Might Be Off (And How to Fix It)

No calculator is perfectly accurate — including this one. Here’s what causes drift:

Wrong activity level selection — The most common error. “Light Movement” and “Active Day” produce calorie differences of 300+ calories. If you’re not losing weight eating at your “deficit,” you’ve likely over-selected your activity level. Drop one level and retest.

Muscle mass changes — As you gain muscle, your BMR rises. Recalculate every 4–6 weeks if you’re training consistently.

Metabolic adaptation — After prolonged calorie restriction, your body down-regulates NEAT (you move less without realizing it), reducing your actual TDEE below the estimate. If progress stalls after 8+ weeks, this is likely the cause.

Age — TDEE naturally declines with age, roughly 1–2% per decade after 30. If you haven’t recalculated in a year, do it now.

The fix: use your TDEE number as a starting estimate, then track your weight for 2–3 weeks. If you’re gaining on a supposed deficit, reduce by 100–150 calories and repeat.

Frequently Asked Questions

The Science Behind the Calculator

DailyTDEE.online uses the Mifflin-St Jeor equation — the formula validated by the American Dietetic Association as the most accurate predictor of resting metabolic rate in healthy adults.

The formula:

• Men: (10 × weight in kg) + (6.25 × height in cm) − (5 × age) + 5
• Women: (10 × weight in kg) + (6.25 × height in cm) − (5 × age) − 161

Your BMR result is then multiplied by an activity factor (ranging from 1.2 for sedentary to 1.9 for extremely active) to produce your full TDEE.

We don’t use the older Harris-Benedict equation — research published in the Journal of the American Dietetic Association found Mifflin-St Jeor to be more accurate in both obese and non-obese individual

Ready to find your number? Scroll up and use the free TDEE calculator — no email, no account, no fluff. Just your exact daily calorie target in under 60 seconds.

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