TDEE stands for Total Daily Energy Expenditure — the total number of calories your body uses in a day. It combines your resting metabolic rate (the energy you burn just staying alive) with the energy used for digestion, daily movement, and exercise. When you eat roughly your TDEE, your weight tends to stay stable, which is why it is often called your maintenance calories.

How is TDEE calculated?

This tool first estimates your Basal Metabolic Rate using the Mifflin-St Jeor equation, which uses your weight, height, age, and sex. It then multiplies that figure by an activity factor between 1.2 (sedentary) and 1.9 (extra active) to account for how much you move. The result is your estimated maintenance calories. The calculator handles the unit conversions and arithmetic for you.

How accurate is a TDEE calculator?

TDEE calculators give a reasonable estimate for most people, but they are not exact. The formula is built from population averages and cannot see your individual metabolism, body composition, hormones, medications, sleep, or stress. Treat the number as a sensible starting point, then watch how your body actually responds over a few weeks and adjust accordingly — ideally with professional support.

What is a safe calorie deficit for weight loss?

A gentle, sustainable deficit — often around 15 to 25 percent below your maintenance calories — supports gradual weight loss while keeping you fuelled. Bigger is not better. Very aggressive deficits are hard to maintain, can leave you under-nourished, and often backfire. A slow, steady approach is generally easier to sustain and tends to protect more muscle.

Should I eat at my BMR to lose weight?

No. Your Basal Metabolic Rate is the energy your body needs at complete rest, and eating at or below it is usually too low and not advisable. Weight management is best approached by setting a modest deficit below your full daily expenditure (TDEE), not your resting rate. If you are unsure what is appropriate for you, a clinician or registered dietitian can help.

Does this calculator replace medical advice?

No. This is an educational estimation tool, not medical advice or a diagnosis. Your calorie needs depend on factors a formula cannot capture, and some health conditions change them significantly. If you are planning meaningful changes to how you eat or exercise, Cloudcure can connect you with clinicians licensed in your Canadian province to build a plan around your individual health.

TDEE Calculator Canada: Daily Calorie Needs

Your free TDEE & daily calorie calculator

Knowing roughly how many calories your body uses in a day is one of the most useful pieces of information for managing your weight — and one of the easiest to get wrong with guesswork. The calculator below estimates your Total Daily Energy Expenditure (TDEE), often called your maintenance calories, from your age, sex, height, weight, and activity level. It also suggests a gentle deficit range if your goal is gradual weight loss. Everything runs in your browser, and the result is framed the way clinicians use it: as an estimate to refine, not a rule to obey.

Your TDEE (Total Daily Energy Expenditure) is the number of calories your body uses in a day. It is your resting metabolic rate — estimated here with the Mifflin-St Jeor equation — multiplied by an activity factor from 1.2 (sedentary) to 1.9 (extra active). Eating around your TDEE keeps weight stable; eating modestly below it, often 15 to 25 percent, supports gradual loss. These figures are population-based estimates, not personal prescriptions: real energy needs vary with body composition, hormones, sleep, and health. Use the number as a starting point and adjust based on how you respond, ideally with a clinician or dietitian.

How TDEE is calculated

Your TDEE is built in two steps. First comes your Basal Metabolic Rate (BMR) — the energy your body burns just to keep you alive, breathing, and warm while completely at rest. This calculator uses the Mifflin-St Jeor equation, which research has consistently found to be among the most accurate of the simple BMR formulas for the general adult population:

BMR = (10 × weight in kg) + (6.25 × height in cm) − (5 × age in years) + s

where s is +5 for males and −161 for females. So a 30-year-old man who is 180 cm tall and weighs 80 kg has a BMR of about (10 × 80) + (6.25 × 180) − (5 × 30) + 5, which works out to roughly 1,780 calories a day at rest.

The second step accounts for movement. Almost nobody spends the whole day lying still, so the BMR is multiplied by an activity factor that reflects how active you are — from 1.2 for a sedentary, desk-based day up to 1.9 for someone with a physical job or twice-daily training. For that same man at a moderate activity level (factor 1.55), the estimated TDEE is about 1,780 × 1.55, or roughly 2,760 calories a day. That is the energy he would need to maintain his current weight.

How to interpret your maintenance calories

The single most useful way to read your TDEE is as the dividing line between gaining and losing. Eat consistently around it and your weight tends to hold steady. Eat below it and your body draws on stored energy, which over time shows up as weight loss. Eat above it and the surplus is stored.

That said, the number is a starting estimate, not a guarantee. Two people with identical height, weight, age, and sex can have genuinely different energy needs because of differences in muscle mass, genetics, gut health, sleep quality, stress, and certain medical conditions. This is why the most reliable approach is to use the estimate to set an initial intake, then watch what actually happens to your weight, energy, and hunger over two to four weeks, and adjust from there.

Setting a sensible deficit for gradual loss

If your goal is weight loss, the calculator suggests a deficit range of roughly 15 to 25 percent below your maintenance calories. There is a reason we keep it modest. A gentle deficit is far easier to sustain, leaves you better fuelled for daily life and exercise, and tends to protect more of your muscle than a crash approach does.

It is tempting to think that a bigger deficit means faster, better results. In practice, very aggressive cuts are hard to maintain, can leave you under-nourished, and often lead to the rebound cycle that makes long-term progress harder. Slow and steady genuinely wins here. A reasonable, sustainable pace of loss is often around 0.5 to 1 percent of your body weight per week, and our weight-loss timeline calculator can help you turn that pace into a realistic schedule. The companion weight-loss calculator takes this further by combining your deficit estimate with a goal weight to project how long your journey is likely to take.

Limitations worth knowing

No calorie calculator can see inside your body. The Mifflin-St Jeor equation was derived from population data, so it describes the average person of your size — not necessarily you. It does not measure your actual metabolic rate, cannot account for differences in body composition, and is blind to thyroid function, certain hormones, medications, pregnancy, and a range of health conditions that meaningfully change energy needs.

Activity factors are also approximate. People routinely over- or under-estimate how active they really are, and the same labelled category can hide a wide range of real-world movement. None of this makes the tool useless — it makes it a reasonable first estimate that should be tested against reality rather than trusted blindly.

Sources

Mifflin MD, St Jeor ST, Hill LA, Scott BJ, Daugherty SA, Koh YO. "A new predictive equation for resting energy expenditure in healthy individuals." American Journal of Clinical Nutrition 1990;51(2):241–7. The original derivation and validation of the equation used by this calculator. doi.org/10.1093/ajcn/51.2.241

Dietitians of Canada. Resting Metabolic Rate — Best Practice Standards and Recommendations. Summarizes the evidence for the Mifflin-St Jeor equation as the preferred BMR formula in Canadian dietetic practice. dietitians.ca

What to do with your result

If you simply wanted a sense of your maintenance calories, you now have a solid estimate to work from. If you are aiming to lose weight, the gentle deficit range gives you a starting intake to try, with the understanding that you will adjust as you learn how your body responds.

For many people, the most valuable next step is not a more precise number but a fuller picture. Calorie balance is one piece of metabolic health; sleep, stress, movement, muscle, and underlying conditions all matter too. A clinician-led conversation can put your TDEE in context, screen for anything a formula would miss, and — when it is genuinely warranted — build an individualized plan grounded in the foundations the evidence supports: nutrition, movement, sleep, and stress management, with monitoring over time. Our overview of medical weight loss programs in Canada explains what that kind of physician-guided care actually involves.

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More free tools

A single number is most useful alongside others. If you found this helpful, these companion calculators look at your metabolic picture from different angles:

BMI calculator — where your height and weight place you on the standard adult scale
Weight-loss timeline calculator — a realistic schedule for reaching a goal weight at a safe pace
Waist-to-height ratio calculator — a quick screen that often adds more than BMI alone
HOMA-IR calculator — an estimate of insulin sensitivity from fasting blood work

Each runs entirely in your browser and is framed as a screening or estimation aid, never a diagnosis.

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