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Window cleaning time calculator
Put your windows and minutes a window in: 6 windows at 15 minutes a window take 90 minutes — 1.5 hours of window cleaning.
★ EVERYDAY · WINDOWS · TIME
Window Cleaning Calculator: 6 Windows Take 90 Minutes
On the defaults — 6 windows at 15 minutes a window — window cleaning time is 90 minutes, or 1.5 hours. This is the window cleaning time tool: multiply the windows by the minutes a window for the minutes, divide by 60 for the hours — a house guessed from the window count alone tells you nothing until the pace behind it is known.
What does 90 minutes, 1.5 hours mean?
It means six windows, each cleaned for fifteen minutes, take ninety minutes in total, which is one point five hours of window cleaning. The windows set how many panes are covered, the pace sets the time each window takes, and the hour is a fixed sixty minutes: one more window adds a full fifteen minutes without speeding up any window, and a slower pace adds time to every window without adding a single extra window. The only judgement is the pace — 15 minutes must be the pace actually cleaned, not the quick wipe over the glass hoped for, and the pace that settles the housework is the one the windows actually take, sills, frames, and streak-checking included, not the inside glass alone.
Output · formula · meaning
| Output | Formula | What it means |
|---|---|---|
| Total minutes | windows × minutes a window | 90 minutes — 6 × 15. |
| Total hours | minutes ÷ 60 | 1.5 hours — 90 ÷ 60. |
Three things to check before you trust the number
First, check the windows honestly: 6 windows must be windows actually cleaned, not panes counted twice because a double window was tallied as two — a window counted that was never cleaned adds fifteen phantom minutes to the day. Second, check the pace against the glass, not the hope: 15 minutes must be the pace actually cleaned, including sills, frames, and a final streak check, because a large or grimy window takes longer than a small clean one, and a pace borrowed from the quickest window misstates the total by the whole difference on every window. Third, check the hours against the day: 1.5 hours of window cleaning is real work, not machine time — the figure to plan around is when the last window is done, including time for moving the ladder and putting the squeegee away as it is finished.
Worked example
6 windows, 15 minutes a window. Minutes: 6 × 15 = 90 minutes. Hours: 90 ÷ 60 = 1.5 hours. In practice that means starting ninety minutes before the house must look its best if the windows must be done before guests arrive — the number to set against the afternoon plan, and the 90-minute figure to use when a seventh window is weighed against a faster pace.
Every branch, checked
At 10 windows instead of 6, the time rises to 150 minutes — 2.5 hours. At 10 minutes a window instead of 15, the time falls to 60 minutes — 1 hour. At 4 windows instead of 6, the time falls to 60 minutes — 1 hour. At 20 minutes a window instead of 15, the time rises to 120 minutes — 2 hours.
The reverses, worked backwards
The windows behind 90 minutes are 6: at 4 windows the time is 60 minutes; at 10 windows it is 150 minutes. The pace behind 90 minutes is 15 minutes: at 10 minutes a window the time is 60 minutes; at 20 minutes a window it is 120 minutes — the pace never touches the window count, only the time each window takes.
What the defaults assume
The defaults assume 6 windows cleaned back to back at 15 minutes a window, with no gap for moving a ladder, fetching fresh water, or re-doing a streaked pane. They do not assume a half window, a window skipped because it was cleaned last week, or a skylight that needs a pole — a house heavy with large or high windows needs longer than 1.5 hours from first window to last, so treat 90 as the cleaning time, not the whole housework morning.
Who uses this
- A householder planning cleaning day: the 1.5 hours settles when the last window is cleaned.
- A household splitting chores: the window lever shows what one more window really costs.
- A renter checking a cleaning service quote: the pace figure is the line to set against the quoted hours.
- A host tidying before guests arrive: the minutes figure turns windows into a start time.
Accuracy & limitations
The arithmetic is exact for the inputs entered; the judgement is the window count and the true pace. Real window cleaning varies with window size, height, grime, and weather — so treat 90 as the planning time for six windows at a true 15-minute pace, and check it against one timed window before quoting it to anyone else.
Cite this calculator
Bright Side Kit, “Window Cleaning Calculator: 6 Windows Take 90 Minutes”, https://brightoolbox.com/window-cleaning-calculator/, accessed 3 November 2026. Students and researchers: cite the calculator name, the page URL and the date you used it, and quote the defaults (6 windows, 15 minutes a window) so the result can be checked.
Frequently asked questions
How long does it take to clean 6 windows?
90 minutes on the defaults: 6 windows × 15 minutes = 90 minutes, or 1.5 hours of window cleaning.
Does the pace include sills and frames?
It should: enter the full time a window actually takes, sills wiped, frames cleaned, and streaks checked. A 10-minute wipe with 5 minutes of sills and frames is a 15-minute window, and entering only the glass understates every window.
Why do large windows take longer?
Because more glass must be washed, more water must be squeegeed off, and edges must be detailed: large windows and French panes often take longer than small plain ones. Enter the pace the windows actually take, not the fastest window in the house.
How many windows fit in an hour?
Divide the hour by the pace: 1 hour fits 4 windows at 15 minutes, and a 10-minute pace fits 6 windows in an hour — the pace decides the count, not the house.
Is window cleaning time the same as cleaning time?
No: window cleaning is one chore among several. The 90 minutes is windows only, and sweeping, dusting, and vacuuming add their own time on top of it.
How is this different from the sweeping time calculator?
That page times sweeping across rooms; this page times cleaning across windows. Use that page for the broom, this page for the squeegee.