Free TDEE Calculator Online

TDEE Calculator: Your Real Daily Calorie Burn, Not Just the Resting Number

Total Daily Energy Expenditure is the full amount of energy your body uses across an entire day — resting functions, digestion, fidgeting, walking, work, and structured exercise, all rolled into one figure. It's the number most people actually mean when they ask "how many calories do I burn in a day," and it's meaningfully larger than a resting-only estimate because it accounts for everything a body does beyond simply staying alive. This calculator builds TDEE the standard way: it first works out a resting baseline using the Mifflin-St Jeor equation, then multiplies that baseline by one of five activity multipliers depending on how much you move in a typical week. Sex, age, weight, height, and an activity selection are the only inputs required, and the result updates the moment you change any of them.

Where a resting-metabolism figure answers "what does my body need doing nothing," TDEE answers "what does my body actually spend in a normal week, averaged into a daily number." That distinction matters because TDEE — not the resting figure underneath it — is the realistic maintenance level: eat around your TDEE and your weight tends to hold roughly steady; eat meaningfully below or above it and weight tends to trend down or up over time.

How the Calculator Puts BMR and Activity Together

The tool walks through the calculation in a fixed sequence, visible in the four result tiles it produces:

1. Choose sex, then toggle between metric (kg/cm) and imperial (lb/in) — imperial entries get converted to kilograms and centimeters before anything else happens.
2. Enter age, weight, and height. As soon as all three have values, an internal BMR figure is computed using the Mifflin-St Jeor equation (10×kg + 6.25×cm − 5×age, plus 5 for men or minus 161 for women).
3. Pick an activity level from five options, each carrying a specific multiplier: Sedentary (little or no exercise, ×1.2), Light (exercise 1-3 days a week, ×1.375), Moderate (exercise 3-5 days a week, ×1.55), Active (exercise 6-7 days a week, ×1.725), and Very Active (a physically demanding job or training twice a day, ×1.9).
4. Four figures render side by side: the underlying BMR, the resulting TDEE (BMR multiplied by the chosen activity factor), a "Cut" figure that subtracts 500 calories from TDEE as a rough weight-loss reference, and a "Bulk" figure that adds 500 as a rough weight-gain reference.

Every field is live — nudge the weight, swap the activity level, and all four numbers recompute immediately, with no page reload or waiting.

What a Maintenance Number Is Actually Used For

TDEE tends to show up as a reference point rather than a final answer:

• Setting a maintenance baseline before adjusting for a goal. Most weight-management planning starts by establishing "what keeps me steady" and then deliberately shifts calories up or down from there.
• Sanity-checking a diet plan's numbers. If a program or app hands you a daily calorie target, comparing it against your own TDEE tells you roughly how aggressive a deficit or surplus it's actually asking for.
• Understanding why two people who look similar can eat very differently. A desk-bound job and a physically demanding one produce dramatically different activity multipliers even at the same weight and height, which is a big part of why one-size-fits-all calorie advice tends to fall apart in practice.
• Deciding whether a training or lifestyle change is worth the calorie cost. Moving from "Light" to "Active" shifts the multiplier by a noticeable margin, which is a quick way to see how much extra food a more demanding routine would justify.
• Establishing a number before combining it with a macro split. A total-calorie figure like this one is the input a macro-percentage breakdown needs before it can produce actual protein, carb, and fat gram targets.

Inside the Activity Multipliers

The five-tier system is a widely used simplification of a genuinely continuous spectrum of physical activity, condensed into fixed multipliers so the math stays tractable:

Activity level	Typical pattern	Multiplier	Worked example (BMR 1780)
Sedentary	Desk job, little to no formal exercise	×1.2	2136 cal/day
Light	Light exercise or sports 1-3 days/week	×1.375	2448 cal/day
Moderate	Moderate exercise or sports 3-5 days/week	×1.55	2759 cal/day
Active	Hard exercise or sports 6-7 days/week	×1.725	3071 cal/day
Very Active	Physical job, or intense training twice a day	×1.9	3382 cal/day

That worked column uses the calculator's own reference case: an 80 kg, 180 cm, 30-year-old male, whose Mifflin-St Jeor BMR comes out to 1780. Multiplying by the Moderate factor (×1.55) lands on 2759 calories/day — the figure the tool would show as TDEE for that exact combination of inputs at that activity level. Notice how much the daily number swings purely from the activity selection, with every other input held fixed; picking the wrong tier is one of the easiest ways to end up with a maintenance estimate that's off by several hundred calories.

TDEE and Weight Trends Over Weeks, Not Days

A single day rarely matches TDEE exactly, and that's expected rather than a sign the number is wrong. Sleep quality, stress, an unusually sedentary Sunday, or an unplanned long walk all shift a given day's actual energy expenditure above or below the average the formula produces. TDEE is best read as a multi-week average target — eating consistently around it, tracked over three or four weeks alongside regular weigh-ins, is what reveals whether the estimate is running close to your real maintenance level or needs a manual nudge up or down. Body weight itself fluctuates day to day from water, sodium intake, and digestive contents well beyond anything related to actual fat gain or loss, which is exactly why a single morning's number on the scale is a poor way to judge whether a TDEE estimate is accurate.

How Reliable Is This, and Should I Treat It as Medical Guidance?

TDEE carries two layers of uncertainty stacked on top of each other. The first is whatever error already exists in the underlying BMR estimate, since Mifflin-St Jeor is itself a population-derived formula rather than a personal measurement. The second, often larger, layer comes from the activity multiplier itself — it's a self-selected category, and most people are not especially good at judging where their own week actually falls on a five-point scale, particularly when work-related movement (standing, walking around an office, a physical job) doesn't map cleanly onto "days of exercise."

Because of that stacked uncertainty, this tool should be treated strictly as an informational and educational estimate, not medical or nutrition advice, and not a substitute for guidance from a doctor or registered dietitian — especially if you're managing a medical condition, are pregnant, or are working with a coach or clinician on a structured nutrition plan. If a number here seems inconsistent with how your weight is actually trending over several weeks, real-world tracking is more trustworthy than any formula, since it reflects your actual metabolism rather than a population average.

Where People Get Their TDEE Number Wrong

• Rounding activity level up out of optimism. Picking "Active" because you intend to exercise five or six days a week, rather than because you consistently do, inflates the estimate and can stall progress on a cut without an obvious explanation.
• Treating the Cut and Bulk tiles as precise targets. The ±500 figures are a simple starting reference, not a personalized deficit or surplus calibrated to your specific goal timeline.
• Not recalculating after a meaningful weight change. Because weight is a direct input to the BMR formula underneath TDEE, losing or gaining a noticeable amount shifts the whole calculation, so an estimate from months ago may no longer reflect where you are now.
• Double-counting structured exercise. The activity multiplier already folds in a general allowance for workouts at that tier, so stacking a separate calories-burned figure from every gym session on top of TDEE risks overestimating total daily burn.

Alternatives to a TDEE Calculator

• Manual multiplication. Once you have a BMR figure from any source, multiplying by the matching activity factor from the table above reproduces the same TDEE by hand.
• Wearable-device estimates. Fitness trackers that monitor heart rate and movement throughout the day can produce a more personalized, moment-to-moment energy-expenditure estimate, though accuracy varies by device and tends to be better for exercise sessions than for all-day totals.
• Weeks of real-world tracking. Logging food intake alongside consistent weight measurements over several weeks reveals your actual maintenance level far more precisely than any formula, since it's grounded in your own data rather than a population equation.
• This calculator's API. For an app, spreadsheet, or automated workflow that needs the same BMR-times-activity-factor calculation without a browser form, the underlying logic is available as a metered API endpoint — request it with weight, height, age, sex, and an activity level, and get back the BMR, the chosen multiplier, and the resulting TDEE as JSON. Full parameters are in the API documentation.

How is TDEE different from the resting metabolic-rate number underneath it?

The resting figure only covers what your body needs lying still — TDEE takes that figure and multiplies it by an activity factor to account for movement, exercise, and daily life, so TDEE is always the larger of the two numbers (unless the activity multiplier were somehow 1.0, which none of the five tiers here is).

Which activity level should I pick if I honestly don't know?

When unsure, it's usually safer to underestimate slightly than overestimate — Sedentary or Light is a reasonable starting point for most people with a typical desk job and inconsistent exercise, since overestimating activity is the more common mistake and tends to produce an inflated maintenance number.

What's the difference between this and the calorie calculator?

This tool stops at the maintenance figure — the calorie amount that should roughly hold your weight steady. A separate calorie calculator takes that maintenance number and applies a further deficit or surplus on top of it to produce specific targets for losing or gaining weight.

Does my TDEE stay the same forever once I calculate it?

No — because weight, age, and activity habits all feed directly into the formula, TDEE shifts as any of those change. A figure calculated at the start of a diet, for instance, is likely to be somewhat high by the time you've lost a meaningful amount of weight.

Why do the Cut and Bulk tiles both use exactly 500 calories?

Five hundred calories a day is a commonly cited round number that lines up with a widely used rule of thumb about weekly weight change, making it a convenient default reference rather than a personalized figure. A dedicated calorie calculator on this site allows that adjustment amount to be changed to something smaller or larger than 500, alongside separate lose and gain targets rather than a fixed ±500 pair.

Related Tools

This calculator's maintenance figure is the raw material for several other tools on the site. Feed it into the calorie calculator to get specific lose/maintain/gain targets built from an adjustable deficit or surplus, or into the macro calculator to translate a total-calorie number into protein, carb, and fat grams. To see the resting figure this tool starts from in isolation, visit the BMR calculator, and for a per-workout energy estimate rather than a daily average, the calories burned calculator uses activity-specific MET values instead of a broad weekly multiplier.