Calories Burned Walking very briskly (4.5 mph) at 85 kg — 595 kcal per Hour
Walking very briskly (4.5 mph) at 85 kg (176-198 lb) burns about 595 kcal per hour. That figure comes from the activity's MET value of 7 in the 2011 Compendium of Physical Activities, multiplied by body weight: 7 x 85 kg x 1 hour = 595 kcal. This page works the numbers out in full - for 15, 30, 45, 60 and 90 minutes, across all four weight bands, and against four comparable activities at the same weight - so you can plan sessions with real figures instead of guessing.
At 4.5 mph (7.2 km/h) this is walking at its fastest — the speed of a race walker in training, or someone power-walking to catch a train. You cover about 7.2 km in an hour, or a mile in about 13 minutes, and talking is reduced to short phrases between breaths. It crosses into vigorous intensity: at 7.0 METs it burns more per hour than a slow jog.
Very brisk walking suits experienced walkers, race walkers, and people who want a hard workout without the impact of running. The headline number to remember is 595 kcal per hour at 85 kg, or about 298 kcal for a 30-minute walk. Everything below is an estimate: MET values are population averages, and your own burn will vary with fitness, technique and conditions. That does not make the numbers useless — it makes them a planning tool, and a good one, as long as you treat them as approximate.
Calculate your own numbers
Use the calorie calculator to work out your own burn for walking very briskly (4.5 mph) at your exact weight and session length. Enter your weight, pick the activity and set the duration, and the tool applies the same MET formula shown below. You can also try the step calorie calculator to turn your daily step count into an energy figure.
Related pages in this section:
The formula, shown and cited
The standard way to estimate the energy cost of an activity is the MET formula from the Compendium of Physical Activities (Ainsworth et al., Medicine & Science in Sports & Exercise, 2011; 43(8): 1575-1581):
Calories (kcal) = MET x body weight (kg) x duration (hours)
One MET is the energy you use sitting quietly at rest - about 1 kcal per kilogram of body weight per hour. An activity rated at 7 METs therefore uses 7 times as much energy as resting. The Compendium's MET values come from published studies that measured oxygen use during each activity, so they are measured averages, not guesses. The value used here, 7, is the one recorded for walking very briskly (4.5 mph) in the FitCalc activity data.
Worked through for this page:
- MET for walking very briskly (4.5 mph): 7
- Body weight: 85 kg (the midpoint of the 80-90 kg band, 176-198 lb)
- Duration: 1 hour
- Calculation: 7 x 85 x 1 = 595 kcal
For a 30-minute session the same calculation is 7 x 85 x 0.5 = 298 kcal. Nothing else is hidden in the maths - if your weight or duration changes, only those two numbers change.
Your numbers at 85 kg
| Duration | Calculation | Calories burned |
|---|---|---|
| 15 minutes | 7 x 85 x 0.25 | 149 kcal |
| 30 minutes | 7 x 85 x 0.5 | 298 kcal |
| 45 minutes | 7 x 85 x 0.75 | 446 kcal |
| 60 minutes | 7 x 85 x 1 | 595 kcal |
| 90 minutes | 7 x 85 x 1.5 | 892 kcal |
That is about 9.9 kcal per minute of walking very briskly (4.5 mph) at this weight. A short session still counts: even 15 minutes burns 149 kcal, and three 15-minute sessions across a day add up to the same 446 kcal as one 45-minute session.
How the burn changes with body weight
The MET value stays the same - it describes the activity, not the person - but the calorie total scales with weight, because a heavier body costs more energy to move:
| Body weight | Calories per hour | Calories per 30 minutes |
|---|---|---|
| 55 kg | 385 kcal | 192 kcal |
| 65 kg | 455 kcal | 228 kcal |
| 75 kg | 525 kcal | 262 kcal |
| 85 kg | 595 kcal | 298 kcal |
Two people doing the same activity for the same time can therefore burn quite different amounts, and that is expected - it is physics, not a mistake in the formula. If your weight sits between two rows, your figure sits between the two values.
How walking very briskly (4.5 mph) compares
Here is walking very briskly (4.5 mph) against four other activities at the same 85 kg, all using the same MET formula:
| Activity | MET | Calories per hour at 85 kg |
|---|---|---|
| walking very briskly (4.5 mph) | 7 | 595 kcal |
| walking briskly (4 mph) | 5 | 425 kcal |
| hiking | 6 | 510 kcal |
| Nordic walking | 4.3 | 366 kcal |
| climbing stairs | 8.8 | 748 kcal |
Use this table to choose, not to judge. A higher number means a harder session, not a better one: the activity you enjoy and repeat three times a week beats the activity that burns more per hour but that you quit after a fortnight. Mixing intensities across the week - one harder session, two easier ones - is usually more sustainable than doing the hardest activity every time.
Fitting walking very briskly (4.5 mph) into your week
| Sessions per week | 30 minutes each | 60 minutes each |
|---|---|---|
| 2 sessions | 596 kcal | 1190 kcal |
| 3 sessions | 894 kcal | 1785 kcal |
| 5 sessions | 1490 kcal | 2975 kcal |
At 7.0 METs, very brisk walking is vigorous-intensity activity, so it counts double toward the widely used adult activity target: 75 minutes of vigorous activity a week is the equivalent of 150 minutes of moderate activity. Three 30-minute very brisk walks a week give you 90 vigorous minutes — more than the target — and burn about 894 kcal a week at 85 kg. Because it is demanding, keep at least one easier day between hard walks, and mix in slower walks for recovery.
How to use the result
Warm up properly: five minutes at a moderate pace, then five minutes building up, before you hold 4.5 mph. Keep your stride quick and short rather than long — overstriding at this speed strains the hips and lower back. Drive with bent elbows pumping front to back, keep your torso upright, and roll through each foot from heel to toe. Many people find this pace easier with a clear, flat route and no crossings, because stopping and restarting at 4.5 mph is tiring. If you keep breaking into a jog, that is normal: 4.5 mph is near the natural walk-run transition for most adults, and alternating short jogs with fast walking is a perfectly good workout in its own right. Use the numbers on this page to set realistic expectations rather than to chase a daily total. If you are tracking food as well, add the session's calories to your total daily energy expenditure for that day, and remember that the figure is an estimate with roughly 10-20% uncertainty. Do not eat back every calorie the calculator shows: activity trackers and MET estimates both tend to overstate slightly, and a small margin keeps a weight-loss plan on track. If you are aiming to lose weight, keep the deficit modest - 300-500 kcal a day is a common, sustainable range - and keep your total intake above the safety floors of 1,200 kcal a day for women and 1,500 kcal a day for men unless a healthcare professional advises otherwise.
What the number does NOT tell you
The MET formula is honest about what it measures and silent about the rest. It assumes steady walking on level ground at 4.5 mph with a walking gait, so it does not account for hills, stops, or the moments when you break into a jog — all of which change the real figure. It does not account for your fitness level: a fit person burns slightly fewer calories doing the same walk than an unfit person, because their body is more efficient, and a trained race walker may be far more efficient still. It does not account for body composition, and it says nothing about strength, flexibility or balance gained. It also cannot tell you whether very brisk walking is safe for you: if you have a heart condition, joint problems, breathing difficulties or any other health concern, check with a healthcare professional before starting a new, intense activity. Use the calorie figure as a planning estimate, and judge the walking by how you feel doing it and whether you keep doing it.
Frequently asked questions
How many calories do I burn walking very briskly for 30 minutes at 85 kg?
About 298 kcal. The maths is 7 METs x 85 kg x 0.5 hours = 298 kcal. That is an estimate from the Compendium average — your real burn depends on your fitness, your exact pace and the terrain. If you weigh more or less than 85 kg, use the weight table above to read your own figure.
Is walking very briskly better than running slowly?
Per hour, very brisk walking at 7.0 METs burns less than running at 5 mph (8.3 METs, about 706 kcal an hour at 85 kg) but more than a slow jog at lower speeds. The real difference is impact: walking keeps one foot on the ground at all times, so it is much gentler on knees, hips and ankles. If your joints prefer walking, very brisk walking is an excellent substitute for a slow run.
How many calories do I burn walking very briskly per mile?
About 132 kcal per mile at 85 kg. A mile at 4.5 mph takes about 13 minutes 20 seconds, so the maths is 7 METs x 85 kg x roughly 0.22 hours. That is more per mile than any slower walking pace, because the MET value keeps rising with speed.
Why do I keep breaking into a jog at this pace?
Because 4.5 mph is close to the natural walk-run transition for most adults. Above roughly 4-4.5 mph, running becomes more energy-efficient than walking, so your body wants to switch. That is normal and not a failure — alternating fast walking with short jogs is a legitimate workout, and race walkers train for years to hold a fast walking gait.
Can very brisk walking help with weight loss?
It can help, but only as part of an overall calorie deficit. At 85 kg, an hour burns about 595 kcal, which is a strong contribution — roughly the energy in a full meal — but weight loss still comes from the total balance of food and activity across the week, not from one walk. Aim for a gradual loss of 0.5-1% of body weight per week, and never drop below 1,200 kcal a day (women) or 1,500 kcal a day (men) without medical supervision.
Estimates only, not medical advice. Minimum safe intakes: 1,200 kcal/day women, 1,500 kcal/day men - consult a healthcare professional before a very-low-calorie diet.