What this Calories Burned Calculator does
This English-language calories burned calculator estimates how many kilocalories you expend during 24 common activities — walking, running, cycling, HIIT, swimming, and more. It applies the standard MET formula: kcal = MET × weight (kg) × duration (hours), drawing MET values from the Ainsworth Compendium of Physical Activities, the peer-reviewed reference used in exercise physiology research worldwide since 1993. Unlike generic fitness-app estimates, every figure here is traceable to a published source. The CDC notes that body weight and composition are central inputs to any calorie expenditure model — which is why this tool asks for your weight explicitly rather than using a population default. Enter your weight in kilograms or pounds, pick an activity, set a duration, and you get total kcal, the MET value for that activity, and your per-minute burn rate. Everything runs in your browser — 100% client-side, your data never leaves your device. No uploads, no tracking, no server logs.
Features
- 24 activities with peer-reviewed MET values. Every activity — from slow walking to rock climbing — uses a MET value sourced from the 2011 Ainsworth Compendium, the gold-standard reference in exercise science, not proprietary fitness-app guesses.
- Metric and imperial weight input. Switch between kilograms and pounds without re-entering your data. The formula converts internally so the calorie expenditure result is always accurate regardless of which unit system you prefer.
- Three output values at once. Each calculation returns total calories burned (kcal), the MET for the selected activity, and your kcal-per-minute rate — useful when you want to compare workout efficiency across different durations.
- Built-in accuracy disclaimer. MET is a population mean. Individual calorie expenditure can differ 15-20% based on fitness level, terrain, temperature, and body composition. The tool surfaces this caveat directly so you're never misled by false precision.
- Completely private, no account needed. The calculator runs entirely in your browser. No data is sent to a server, no cookies are set for tracking, and no account is required. You can use it offline once the page loads.
- Pairs with TDEE and macro planning. Calorie burn only tells part of the story. Once you know your activity expenditure, you can feed that into the [TDEE calculator](/en/tdee-calculator/) to determine your full daily energy needs and plan intake accordingly.
How to use the Calories Burned Calculator
Three inputs, instant result. No sign-up, no waiting.
- Choose your unit system. Select Metric (kg) or Imperial (lb) at the top. The weight field label updates automatically.
- Enter your body weight. Type your current weight. Body weight is a direct multiplier in the MET formula — a 90 kg person burns roughly 29% more calories than a 70 kg person doing the same activity for the same duration.
- Select an activity. Pick from 24 options spanning cardio, strength, and recreational sports. If you need a finer split — say, walking at 3 mph vs. brisk walking at 4 mph — each pace has its own MET entry.
- Set the duration. Enter how many minutes you plan to exercise (or already did). For a 45-minute moderate cycling session you'd type
45; for a 90-minute hike,90. - Read your three outputs. The result shows total kcal burned, the activity's MET value, and your per-minute burn rate. Use the kcal/min figure to compare workout options when total time is fixed.
Common use cases
- Planning a calorie deficit for weight loss. Use this tool to estimate the calorie cost of your planned workouts, then cross-reference with the [TDEE calculator](/en/tdee-calculator/) to size a realistic deficit. A 500 kcal/day deficit is a common starting point, but your exercise burn is part of that equation.
- Comparing workouts by calorie cost. Not sure whether a 45-minute run or a 60-minute cycling session burns more? Plug both into the calculator and compare. The kcal-per-minute output makes the efficiency comparison immediate — no mental math needed.
- Fueling endurance events. Runners, cyclists, and hikers preparing for long-duration events (marathons, century rides, overnight trails near Austin or similar terrain) use calorie expenditure estimates to pre-plan on-course nutrition and avoid bonking.
- Cross-checking fitness app numbers. Wearables and apps layer proprietary assumptions on top of MET and frequently overestimate burn. If your smartwatch reports 800 kcal for a 45-minute run and this calculator shows 550, the discrepancy is worth understanding before you eat back all of those calories.
- Client education for fitness and nutrition professionals. Personal trainers and dietitians can use a transparent, citation-backed tool to show clients why the number on the treadmill display isn't gospel — and why body weight, effort level, and workout type all shift the math.
Frequently asked questions
What is a MET value and why does this calculator use it?
MET stands for Metabolic Equivalent of Task. A MET of 1 equals the energy your body burns at rest (roughly 3.5 ml of oxygen per kg per minute). An activity with a MET of 7 burns seven times that amount. The MET formula — kcal = MET × weight (kg) × hours — is the most widely cited method in exercise physiology because the underlying MET values come from controlled lab measurements, not proprietary algorithms. This calculator uses values from the Ainsworth Compendium of Physical Activities, the standard reference since 1993.
How accurate is a MET-based calorie burn estimate?
Expect roughly ±15-20% from your actual expenditure. MET values represent population averages measured in controlled conditions — flat surface, moderate temperature, average fitness level. Real-world factors like hills, wind, heat, and your individual mechanical efficiency all shift the actual number. Highly trained athletes tend to burn fewer calories at a given MET-rated effort because their movement is more efficient. The estimate is useful for planning and comparison; it's not a clinical measurement.
Does body weight really change how many calories I burn?
Yes — it's a direct multiplier in the formula. A 90 kg person doing 30 minutes of brisk walking burns about 29% more calories than a 70 kg person doing the same walk at the same pace. Body composition also matters: lean tissue is metabolically more active than fat tissue, so two people with identical body weight can still have meaningfully different calorie expenditure. If you want to dig into body composition alongside calorie burn, the [Body Fat Percentage Calculator](/en/body-fat-percentage-calculator/) can give you that additional context.
Why does HIIT seem to underestimate calorie burn compared to what I've read?
The MET value for HIIT captures only the calories burned during the session itself. High-intensity work triggers EPOC — excess post-exercise oxygen consumption — where your metabolism stays elevated for hours afterward. Research puts EPOC at roughly 6-15% of the session's energy cost for most HIIT formats. This calculator, like all MET-based tools, does not include EPOC. So if you're comparing HIIT to steady-state cardio, the actual total-day advantage of HIIT is higher than the in-session numbers suggest.
Is my data private? Does anything get sent to a server?
Nothing leaves your browser. The calculator is 100% client-side JavaScript — there is no server call, no account, no cookies used for tracking, and no analytics attached to your inputs. You can disconnect from the internet after the page loads and the tool will still work. Your weight and activity choices are never transmitted or stored anywhere outside your own device.
Can I use this to determine calories burned walking specifically?
Yes — walking is the most-searched use case for a calorie expenditure calculator. Three walking speeds are included: slow (2 mph, MET ≈ 2.5), moderate (3 mph, MET ≈ 3.5), and brisk (4 mph, MET ≈ 5.0). The jump from moderate to brisk is significant — a 75 kg person walking briskly for 30 minutes burns roughly 43% more calories than at a moderate pace. If you walk with a loaded pack or on hilly terrain, expect actual burn to exceed these flat-surface estimates by 10-20%.