Walking at a steady 3 mph (a 20-minute mile) is one of the most practical moderate-intensity activities for daily health. This calculator estimates how many calories you burn during a 3 mph walk using your body weight, walking time, and the Metabolic Equivalent of Task (MET) value for level walking. Choose an effort setting that matches your pace and terrain, and the tool returns total calories, distance covered, calories per minute, and calories per mile.
The estimate is based on the standard MET equation used in exercise science: kcal per minute = MET × 3.5 × body weight in kg ÷ 200. For most adults, 3 mph on firm, level ground is about 3.5 MET, meaning it burns roughly three and a half times your resting metabolic rate. This makes the calculator useful for walkers, hikers, people managing weight, and anyone tracking consistent daily step or distance goals.
How to Use This Tool
This calculator is designed for a steady 3 mph walk, which is a 20-minute mile pace. Enter your body weight in kilograms or pounds, then set the walking time in hours and minutes. The effort menu lets you adjust for conditions: an easy flat walk, a standard moderate level walk, a brisk active walk, or brisk walking with hills or a light load. After pressing Calculate, the results panel shows your estimated total calorie burn, the distance you would cover at 3 mph, your calories per minute, and your calories per mile.
The Formula Behind the Calories
The calculator uses the common exercise-science equation for steady-state activity: kcal per minute = MET × 3.5 × body weight in kg ÷ 200. The number 3.5 represents the oxygen cost of one MET in milliliters per kilogram per minute, and the 200 factor converts oxygen consumption and time into kilocalories. A MET, or metabolic equivalent of task, compares the energy cost of an activity with your resting metabolic rate. Walking on level firm ground at 3 mph is typically assigned a MET value around 3.5, meaning you burn about 3.5 times more energy than sitting quietly.
Worked Examples
Factors That Affect Your Burn
Body weight is the single largest input in this estimate because moving more mass requires more energy. Heavier individuals burn more calories at the same speed, while lighter individuals burn fewer. Terrain also matters: grass, gravel, sand, and uneven trails raise the energy cost even if your speed stays near 3 mph. Hills can increase the burn substantially, and carrying a backpack or pushing a stroller adds extra load. The effort selector accounts for these differences in a general way, but no formula can perfectly match your individual metabolism.
Reference: MET Values for Walking on Level Firm Ground
| Speed | Pace | Approx. MET |
|---|---|---|
| 2.0 mph | 30:00 per mile | 2.8 |
| 2.5 mph | 24:00 per mile | 3.0 |
| 3.0 mph | 20:00 per mile | 3.5 |
| 3.5 mph | 17:09 per mile | 4.3 |
| 4.0 mph | 15:00 per mile | 5.0 |
These values are commonly cited for walking on flat, firm surfaces without added load. Uphill walking, heavy backpacks, and rough terrain can increase the MET value well beyond these numbers. The formula in this calculator is best used as a consistent estimate rather than an exact metabolic measurement.
Frequently Asked Questions
If I know the distance instead of the time, how do I use this calculator? Since 3 mph is a 20-minute mile, multiply the distance by 20 to get the walking time in minutes. For example, 2 miles equals 40 minutes. Enter that time in the hours and minutes fields, then calculate.
Why does my fitness tracker show a different calorie number? Many trackers use heart rate, age, sex, and movement patterns in addition to speed and weight. They can also overestimate or underestimate depending on wrist placement and algorithm. This calculator uses a transparent MET equation, so you can see exactly how the result was derived and adjust the effort setting if needed.
Is this gross or net calorie burn? It is a gross estimate, meaning it includes the calories your body would burn at rest even if you were sitting. If you want the extra calories above resting, subtract roughly 1 kcal per kg per hour. For a 70 kg person walking 30 minutes, resting energy is about 35 kcal, so the net extra burn would be about 94 kcal instead of 129 kcal.
Is walking at 3 mph enough to support heart health or blood sugar control? For many people, yes. A steady 3 mph walk is a moderately intense activity that can improve circulation, support glucose regulation, and contribute to daily energy expenditure. Walking after meals is a common strategy to help blunt post-meal blood sugar rises. If you have a medical condition, check with a healthcare professional about the best walking plan for you.
Where These Numbers Come From
The estimate uses the MET method: kcal = MET × body weight (kg) × hours. One MET is roughly the energy you spend sitting quietly, defined as 3.5 ml of oxygen per kilogram per minute. Every MET value on this page comes from the 2011 Compendium of Physical Activities; the code is listed next to each one so you can look it up yourself.
| Speed / setting | MET used | Where that number comes from |
|---|---|---|
| 2.0 mph (30:00 per mile) | 2.8 | Published — code 17152, walking, 2.0 mph, level, slow pace, firm surface |
| 2.5 mph (24:00 per mile) | 3.0 | Published — code 17170, walking, 2.5 mph, level, firm surface |
| 3.0 mph (20:00 per mile) | 3.5 | Published — code 17190, walking, 2.8 to 3.2 mph, level, moderate pace, firm surface |
| 3.5 mph (17:09 per mile) | 4.3 | Published — code 17200, walking, 3.5 mph, level, brisk, firm surface, walking for exercise |
| 4.0 mph (15:00 per mile) | 5.0 | Published — code 17220, walking, 4.0 mph, level, firm surface, very brisk pace |
| Easy effort, flat and relaxed (3.0 MET) | 3.0 | Published for 2.5 mph (code 17170); this site applies that value to a relaxed 3 mph walk |
| Moderate effort, level walk (3.5 MET) | 3.5 | Published — code 17190 |
| Brisk effort, active walk (4.0 MET) | 4.0 | Interpolated — sits between 3.5 (code 17190) and 4.3 (code 17200); the Compendium publishes no 4.0 walking entry |
| Brisk with hills or light load (4.5 MET) | 4.5 | Published for walking with a light load — code 11800, walking, 3.0 mph, moderately and carrying light objects less than 25 lbs |
The four effort presets are this site’s rounded choices, not four separate published entries. Where a preset sits on a published value the table says so; where it falls between two published points it is marked interpolated. Uphill walking is a different entry entirely (5.3 METs at a 1–5% grade, code 17210), which is why the hills preset is not simply a faster walk.
References
- Ainsworth BE, Haskell WL, Herrmann SD, Meckes N, Bassett DR Jr, Tudor-Locke C, Greer JL, Vezina J, Whitt-Glover MC, Leon AS. 2011 Compendium of Physical Activities: a second update of codes and MET values. Med Sci Sports Exerc. 2011;43(8):1575–1581. doi:10.1249/MSS.0b013e31821ece12
- Compendium of Physical Activities — searchable list of activity codes and MET values.
- Unit definitions: 1 lb = 0.45359237 kg; 1 mile = 1.609344 km; 1 kcal = 4.184 kJ. Source: NIST Special Publication 811, Guide for the Use of the International System of Units (SI).
Last reviewed: 18 October 2026 · Sources checked: 18 October 2026
Medical disclaimer
This page provides general information and an arithmetic estimate. It is not medical advice, diagnosis, or treatment, and nothing here creates a clinician–patient relationship. Estimates are built from population averages and will not match every individual. Do not delay seeking professional advice because of something you read here. If you think you may have a medical emergency, contact your local emergency number.
Disclaimer: This calculator provides general educational estimates for informational purposes only. It is not medical, nutritional, veterinary, or professional advice, and it is not a substitute for consultation with a qualified professional. Individual needs vary with health status, medications, and personal circumstances. Always consult a physician, registered dietitian, or other qualified professional before making decisions about your health, diet, or your pet’s care.
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