Calories Burned Walking in water at 85 kg — 468 kcal per Hour
Walking in water at 85 kg (176-198 lb) burns about 468 kcal per hour. That figure comes from the activity's MET value of 5.5 in the 2011 Compendium of Physical Activities, multiplied by body weight: 5.5 x 85 kg x 1 hour = 468 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.
Walking in water is ordinary walking with the difficulty turned up by resistance: every step pushes against water, which is far denser than air, while buoyancy takes weight off your joints. Chest-deep water walking is rated at 5.5 METs — well above the 3.3 METs of the same walk on land — so you work much harder while your knees feel much less.
Water walking suits people with joint problems, anyone recovering from injury, older adults, and swimmers who want a low-impact workout. The headline number to remember is 468 kcal per hour at 85 kg, or about 234 kcal for a 30-minute session. Everything below is an estimate: MET values are population averages, and your own burn will vary with fitness, water depth, speed 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 in water 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 5.5 METs therefore uses 5.5 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. No exact Compendium entry exists for walking in water, so the data file uses the closest published value - water aerobics, water calisthenics (5.5) - and says so.
Worked through for this page:
- MET for walking in water: 5.5
- Body weight: 85 kg (the midpoint of the 80-90 kg band, 176-198 lb)
- Duration: 1 hour
- Calculation: 5.5 x 85 x 1 = 468 kcal
For a 30-minute session the same calculation is 5.5 x 85 x 0.5 = 234 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 | 5.5 x 85 x 0.25 | 117 kcal |
| 30 minutes | 5.5 x 85 x 0.5 | 234 kcal |
| 45 minutes | 5.5 x 85 x 0.75 | 351 kcal |
| 60 minutes | 5.5 x 85 x 1 | 468 kcal |
| 90 minutes | 5.5 x 85 x 1.5 | 701 kcal |
That is about 7.8 kcal per minute of walking in water at this weight. A short session still counts: even 15 minutes burns 117 kcal, and three 15-minute sessions across a day add up to the same 351 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 | 302 kcal | 151 kcal |
| 65 kg | 358 kcal | 179 kcal |
| 75 kg | 412 kcal | 206 kcal |
| 85 kg | 468 kcal | 234 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 in water compares
Here is walking in water against four other activities at the same 85 kg, all using the same MET formula:
| Activity | MET | Calories per hour at 85 kg |
|---|---|---|
| walking in water | 5.5 | 468 kcal |
| Nordic walking | 4.3 | 366 kcal |
| walking briskly (4 mph) | 5 | 425 kcal |
| hiking | 6 | 510 kcal |
| walking the dog | 3 | 255 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 in water into your week
| Sessions per week | 30 minutes each | 60 minutes each |
|---|---|---|
| 2 sessions | 468 kcal | 936 kcal |
| 3 sessions | 702 kcal | 1404 kcal |
| 5 sessions | 1170 kcal | 2340 kcal |
At 5.5 METs, water walking is moderate-intensity activity at the upper end, so every minute counts in full toward the widely used adult target of 150 minutes of moderate activity a week. Three 30-minute pool sessions a week give you 90 minutes and burn about 702 kcal a week at 85 kg, and five sessions clear the target entirely. Because it is so joint-friendly, water walking pairs well with land walking on alternate days: the pool days give your joints a rest while still burning a serious number of calories.
How to use the result
Walk in water between waist and chest deep: shallower water gives less resistance and more impact, deeper water makes the movement awkward. Wear water shoes or old trainers — pool floors are slippery and rough. Keep your posture upright and your steps deliberate, driving your knees up and pushing the water back with your feet; swinging your arms through the water adds to the work. Start with 15-20 minutes, because water walking is more tiring than it looks, and build up by five minutes a week. Drink water afterwards even though you did not feel sweaty — you still lost fluid. 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. The 5.5 figure is for water walking at a representative depth and pace, and real sessions vary a lot: deeper water and faster steps raise the resistance sharply, while shallow water and a slow amble lower it. It does not account for your fitness level, body composition, the water temperature, or whether you are walking against a current. It says nothing about strength, flexibility or balance gained, and it cannot tell you whether water walking is safe for you: if you have a heart condition, a skin condition, a fear of water, balance difficulties or any other health concern, check with a healthcare professional before starting. Never walk in open water alone, and use a pool with a lifeguard where possible. Use the calorie figure as a planning estimate, and judge the session by how you feel doing it and whether you keep doing it.
Frequently asked questions
How many calories do I burn walking in water for 30 minutes at 85 kg?
About 234 kcal. The maths is 5.5 METs x 85 kg x 0.5 hours = 234 kcal. That is an estimate from the Compendium average for a representative depth and pace — your real burn depends on the water depth, your speed and the conditions. If you weigh more or less than 85 kg, use the weight table above to read your own figure.
Why does walking in water burn more than walking on land?
Because water resists every movement. At 85 kg, walking in water burns about 468 kcal per hour against 280 kcal for walking at a moderate pace on land — roughly 67% more. The drag of the water makes your muscles work harder with every step, while buoyancy unloads your joints at the same time. It is one of the few activities that is both harder and gentler than its land version.
How deep should the water be for water walking?
Between waist and chest deep is the usual range. Shallower water gives less resistance and more impact on your joints; deeper water makes the movement awkward and slows you down. Chest-deep water gives the most resistance while still letting you walk normally — and that is closest to the 5.5 MET figure on this page.
Is water walking good for arthritis?
Many people with arthritis find it one of the most comfortable forms of exercise, because buoyancy takes weight off sore joints while the water's resistance still gives the muscles a workout. Warm water helps further. Start gently, build up gradually, and talk to a clinician first if your arthritis is severe or if you have had a joint replacement.
Can walking in water help with weight loss?
It can help, but only as part of an overall calorie deficit. At 85 kg, an hour burns about 468 kcal, which is a strong contribution for a low-impact activity — 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 session. 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.