Washing windows might not feel like a workout, but it is a real form of gentle movement that challenges your shoulders, core, and legs — especially when you stretch to reach high panes or squat near the floor. This Window MET Calculator estimates the calories you burn during a window-cleaning session using your body weight, time spent, and an appropriate MET (metabolic equivalent) value.
Home cleaners, fitness enthusiasts, and anyone curious about daily activity will appreciate the simple, transparent breakdown: the tool shows the MET value, calories per minute, and total energy cost for each session. It also supports custom MET entry, so you can match the calculation to your own effort level or a fitness tracker value.
Use it to compare cleaning sessions, plan gentle exercise, or add household chores to your weekly movement log.
🪟 Window Energy Calculator
How the MET Formula Works
MET stands for metabolic equivalent, the standard unit exercise scientists use to express activity intensity. One MET equals the energy your body consumes while sitting quietly at rest — roughly 1 kcal per kilogram of body weight per hour. Everyday tasks exceed that baseline: cooking sits around 2–3 MET, brisk walking about 4–5 MET, and window washing generally lands in the 2.3–4.0 MET range depending on how actively you move between panes.
This calculator applies the well-established American College of Sports Medicine (ACSM) estimation formula: calories per minute = MET × 3.5 × body weight in kg ÷ 200. The constant 3.5 represents the average resting oxygen consumption of 3.5 milliliters of oxygen per kilogram per minute, and 200 converts that oxygen uptake into kilocalories. Multiply the resulting per-minute rate by your session length, and you get the total energy cost of the cleaning session.
Reference MET Values for Window Cleaning
The Compendium of Physical Activities, developed by exercise researchers and updated regularly, assigns MET codes to hundreds of daily tasks, including household chores. Window washing usually falls under general indoor cleaning, but your exact value shifts with pace, posture, and the tools you use.
The presets in this calculator are adapted from Compendium-style values for light-to-moderate home activity:
| Effort Level | MET | Description |
|---|---|---|
| Light | 2.3 | Slow careful wiping with frequent pauses; small panes at easy height |
| Moderate | 3.2 | Steady wiping and scrubbing with reaching, bending, and short walks between windows |
| Vigorous | 4.0 | Fast full-arm scrubbing, large or high windows, added resistance, minimal rest |
The values are interpolations from activity categories such as "cleaning, sweeping, or vacuuming" and household activities of moderate effort. For deeper reference material, visit the Compendium of Physical Activities or the American College of Sports Medicine.
Worked Examples
Example 1 — Moderate pace: A 65 kg person washes windows steadily for 40 minutes at 3.2 MET. Rate = 3.2 × 3.5 × 65 ÷ 200 = 3.64 kcal/min. Total = 3.64 × 40 = 145.6 kcal.
Example 2 — Light pace: A 90 kg person does light window cleaning for 25 minutes at 2.3 MET. Rate = 2.3 × 3.5 × 90 ÷ 200 = 3.62 kcal/min. Total = 3.62 × 25 = 90.6 kcal.
Example 3 — Vigorous effort: An 80 kg person scrubs large panes at 4.0 MET for 20 minutes. Rate = 4.0 × 3.5 × 80 ÷ 200 = 5.6 kcal/min. Total = 5.6 × 20 = 112 kcal.
Example 4 — Custom MET from a tracker: Your tracker suggests 2.8 MET and you weigh 70 kg. Rate = 2.8 × 3.5 × 70 ÷ 200 = 3.43 kcal/min. In 45 minutes you burn about 154.4 kcal.
Tips for Better Estimates
- Weigh yourself in the morning before breakfast for the most consistent input; small weight changes shift the result by a few percent.
- Count active cleaning time only. Pauses to refill the bucket, move furniture, or reposition a ladder add minutes but not meaningful effort, so leave them out of the duration field.
- Be honest about intensity. Most people drift between light and moderate. If your arms tire or your breathing noticeably quickens, choose the vigorous preset or enter a custom MET between 3.5 and 4.5.
- Use the same settings each week so your logged sessions are comparable. Changing intensity labels mid-tracking makes trends harder to read.
Factors Affecting Accuracy
The MET method produces group-level averages, not a personalized measurement. Actual burn varies with fitness level, age, temperature, and technique. Carrying a bucket of water, using a heavy extension pole, or working on tiptoe raises effort; an ergonomic squeegee at a relaxed pace lowers it. Very tall or short people may also find the standard formula slightly underestimates or overestimates their energy cost because arm reach changes how much of the body moves.
The result also excludes the small afterburn effect (post-exercise oxygen consumption), which is minor at this intensity. For tracking weekly trends and comparing chores, the calculator is dependable; for medical or athletic decisions, consult a qualified professional.
Frequently Asked Questions
Can I count window washing as exercise? Yes. Tracker apps often file it under housework, and it genuinely contributes to daily movement — especially when you reach overhead, squat near the floor, and keep walking between panes.
Does the result apply to exterior or pressure washing? Roughly, with an adjustment. Exterior work usually involves more vigorous arm motion and walking, so the moderate or vigorous preset, or a custom MET near 4.0–4.5, gives a more realistic figure.
Why does my fitness tracker show a different number? Trackers estimate from heart rate, wrist motion, and your personal profile, while this calculator applies a fixed MET from published compilations. Both are estimates, and differences of 10–20 percent are normal. In that case, also make sure your weight is up to date in both places.
How much can window cleaning contribute to weekly activity? At moderate intensity, a 75 kg person burns roughly 126 kcal in 30 minutes. Doing that three times a week adds about 375 kcal — enough to matter for weight maintenance when combined with a sensible diet.