Whether you want to lose weight, gain muscle or just eat the right amount, it helps to know one number: how many calories do I burn a day? The answer is different for everyone, and it’s easy to estimate in under a minute.
This guide explains what makes up your daily burn, gives you a free calculator, shows examples, and explains what to do with your number. Every formula comes from published research or WHO-backed guidance.
Key takeaways
- Your daily burn has three parts: the energy your body uses at rest, the energy to digest food, and the energy you use moving.
- A 1990 study built the Mifflin-St Jeor equation for resting burn, and found an older 1919 formula overestimated it by 5%.
- FAO, WHO and UNU group lifestyles by activity level, from sedentary (1.40 to 1.69 times resting burn) to vigorous (2.00 to 2.40).
How many calories do I burn a day?
It depends on you. For the example adults in our table below, it ranges from about 1,800 to 3,120 calories a day. Your exact number depends on your size, age, sex and how much you move. To estimate yours, work out your resting burn with the Mifflin-St Jeor equation, then multiply it by your activity level. Our calculator does both steps for you.
What makes up your daily burn
To answer how many calories do I burn a day, start with where the calories go. Your body burns calories all day, even while you sleep. Your total daily burn (sometimes called TDEE, total daily energy expenditure) has three parts:
- Resting burn (BMR). The energy to keep you alive at rest: breathing, your heartbeat, your brain, keeping warm. For most people, this is the biggest part.
- Digesting food. Your body uses some energy to break down and store what you eat.
- Movement. Everything from walking to the car to a workout. This is the part that changes most from person to person, and the part you control.
Bigger bodies burn more at rest. Muscle burns more than fat. And resting burn slowly drops with age. That’s why two people of the same weight can burn quite different amounts.
Calories burned per day calculator
Still wondering how many calories do I burn a day? Type in your details for an estimate of your resting burn and your total calories burned per day.
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How the calculator works
Our calculator answers how many calories do I burn a day in two well-tested steps:
Step 1: Resting burn
The Mifflin-St Jeor equation was built in 1990 from 498 healthy adults aged 19 to 78, whose resting burn was measured in a lab. It found the older Harris-Benedict formula from 1919 overestimated resting burn by 5%. Here it is:
- 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
Step 2: Activity level
Next, multiply your resting burn by your physical activity level (PAL). The FAO, WHO and UNU report on human energy requirements groups lifestyles like this:
| Lifestyle | Activity level (PAL) | What it looks like |
|---|---|---|
| Sedentary or light activity | 1.40 to 1.69 | Desk job, little exercise |
| Active or moderately active | 1.70 to 1.99 | On your feet a lot, or regular daily exercise |
| Vigorous or vigorously active | 2.00 to 2.40 | Heavy physical work or hard daily training |
The report notes that levels above 2.40 are hard to keep up for long. It also gives an example: adding about an hour of moderate to vigorous activity a day can lift a sedentary level of about 1.55 to about 1.75.
Examples by age and size
Here’s how many calories a few example adults burn a day, worked out with the same formula as the calculator:
| Example adult | Mostly sitting (1.4) | Some activity (1.55) | Active (1.75) |
|---|---|---|---|
| Woman, 35, 5 ft 5 in (165 cm), 150 lb (68 kg) | 1,930 | 2,130 | 2,410 |
| Man, 35, 5 ft 10 in (178 cm), 185 lb (84 kg) | 2,500 | 2,760 | 3,120 |
| Woman, 60, 5 ft 4 in (163 cm), 160 lb (73 kg) | 1,800 | 2,000 | 2,250 |
| Man, 60, 5 ft 9 in (175 cm), 190 lb (86 kg) | 2,320 | 2,570 | 2,900 |
These are estimates. Real burn can be higher or lower by a few hundred calories, because of muscle mass, genes, health conditions and medicines.
How to burn more calories
The movement part of your daily burn is the one you can change most. Ideas that add up:
- Aim for the CDC’s goal of 150 minutes of moderate activity, like brisk walking, each week (CDC).
- Add 2 days of muscle-strengthening activity a week, which the CDC also recommends. Muscle helps your resting burn.
- Walk more in daily life. Our guide on how many steps in a mile turns your steps into distance.
- Break up long sitting with short walks or standing.
Be careful with very big burn goals. Our guide on burning 1,000 calories a day explains why extreme targets can backfire.
Using your number to lose weight
To lose weight, you need to take in fewer calories than you burn, over time. But your body adapts as you lose weight, so a simple “cut 500 calories a day” rule doesn’t stay accurate for long.
For a more realistic plan, the NIH’s free Body Weight Planner builds in those changes. Our guides on steps a day to lose weight and the weight loss plateau explain what to expect along the way.
When to see a doctor
Talk to a doctor or registered dietitian before a big change in what you eat if you’re pregnant or breastfeeding, have diabetes, heart or kidney disease, or take medicines that affect your weight or appetite.
Also see a doctor if you lose weight without trying, feel tired or cold all the time, or your weight changes fast for no clear reason. These can be signs of a health problem that needs checking.
Frequently asked questions
How many calories do I burn a day naturally?
Your resting burn (BMR) is what your body uses at rest. For the example adults in this guide, it ranges from about 1,290 to 1,780 calories a day. Add normal daily movement and the total rises to about 1,800 to 3,120. Our calculator estimates both for you.
Is burning 400 calories a day enough?
It depends on your goal. For health, the CDC says adults need 150 minutes of moderate activity a week, and that’s about time, not calories. For weight loss, what matters is the gap between what you eat and what you burn overall, not one daily number.
Is it enough to burn 500 calories a day?
Burning an extra 500 calories through activity is a lot for most people, often well over an hour of brisk walking. It can help, but most people find it easier to combine a smaller amount of extra activity with modest changes to what they eat.
Does 10,000 steps burn 200 calories?
Usually more. Using walking values from the Compendium of Physical Activities, a 154 lb (70 kg) adult walking 10,000 steps at about 3 mph burns roughly 270 to 340 calories more than sitting still. Heavier people and faster walkers burn more; lighter people burn less.
How many calories do I burn sleeping?
While you sleep, you burn calories at close to your resting rate. So if your resting burn is 1,500 calories a day, 8 hours of sleep uses roughly a third of that, about 500 calories. Your body still breathes, pumps blood and repairs itself overnight.
What is the difference between BMR and TDEE?
BMR is the energy your body uses at complete rest. TDEE is your total daily energy expenditure: your BMR plus the energy for digesting food and all your movement. TDEE is the number to use when planning how much to eat.
Do I burn more calories as I age?
No, usually fewer. In the Mifflin-St Jeor equation, resting burn drops by 5 calories a day for each year of age. Staying active and keeping muscle with strength training helps limit that drop.
The bottom line
How many calories do I burn a day? It depends on your size, age, sex and activity, and for the example adults here it ranges from about 1,800 to 3,120. Use the calculator for your own estimate, treat it as a starting point, and adjust based on how your weight changes over a few weeks.
Related reading
- Burning 1,000 calories a day: is it safe?
- How many steps a day to lose weight: a simple 4-week plan
- Weight loss plateau: 7 honest reasons and how to restart
- How many steps in a mile? A simple 1-minute guide
Sources
- Mifflin MD, St Jeor ST, et al. A new predictive equation for resting energy expenditure in healthy individuals. Am J Clin Nutr, 1990
- FAO/WHO/UNU: Human energy requirements, chapter 5 (physical activity level)
- CDC: Physical Activity Guidelines for Adults (20 Dec 2023)
- NIDDK (NIH): Body Weight Planner
- 2024 Adult Compendium of Physical Activities: Walking