825
Window size lookup
Pick a size for its dimensions, area and room — or work backwards from the area to find the size.
★ REFERENCE CHART · CONSTRUCTION · WINDOWS
Window Size Chart: Standard Window Sizes & Dimensions
A 36×48 in window is 91.44×121.92 cm — 1,728 sq in, 12.00 sq ft — and it is the standard size for a bedroom or living room. Every standard window size is in the table below, with centimetres, area in square inches and square feet, and the room each size is for — pick a size in the calculator, or work backwards from the area to find the size.
The full chart
Every standard window size: inches, centimetres, area in square inches and square feet, and the room each size is for. The sizes run from 24×36 in for a small bathroom up to 72×48 in for a picture window, and the area is what decides how much light and air the window gives: a 72×48 in window is twice a 36×48 in window by area, and a 36×48 in window is twice a 24×36 in window. The width is written first, the height second — a 48×60 in window is tall and narrow, a 60×48 in window is wide and short, and both are 20.00 sq ft.
| Size (in) | Centimetres | Area (sq in) | Area (sq ft) | Typical room |
|---|---|---|---|---|
| 24x36 | 60.96x91.44 cm | 864 sq in | 6.00 sq ft | bathroom / small bedroom |
| 30x36 | 76.20x91.44 cm | 1,080 sq in | 7.50 sq ft | bedroom |
| 36x36 | 91.44x91.44 cm | 1,296 sq in | 9.00 sq ft | bedroom |
| 36x48 | 91.44x121.92 cm | 1,728 sq in | 12.00 sq ft | bedroom / living room |
| 36x60 | 91.44x152.40 cm | 2,160 sq in | 15.00 sq ft | living room |
| 48x48 | 121.92x121.92 cm | 2,304 sq in | 16.00 sq ft | living room |
| 48x60 | 121.92x152.40 cm | 2,880 sq in | 20.00 sq ft | living room |
| 60x48 | 152.40x121.92 cm | 2,880 sq in | 20.00 sq ft | living room |
| 72x48 | 182.88x121.92 cm | 3,456 sq in | 24.00 sq ft | living room / picture window |
The worked example, line by line
Defaults: window size 36x48 in.
Line 1 — the inches. The window is 36 in wide and 48 in tall — the size printed on the order.
Line 2 — the centimetres. 36 × 2.54 = 91.44 cm wide; 48 × 2.54 = 121.92 cm tall.
Line 3 — the area in square inches. 36 × 48 = 1,728 sq in.
Line 4 — the area in square feet. 1,728 ÷ 144 = 12.00 sq ft.
Line 5 — the room. A 36×48 in window is the standard size for a bedroom / living room.
Reverse: a window of 12.00 sq ft is 36×48 in; 6.00 sq ft is 24×36 in; 24.00 sq ft is 72×48 in; 20.00 sq ft is 48×60 in or 60×48 in (the width decides); 9.00 sq ft is 36×36 in; 15.00 sq ft is 36×60 in.
Every branch, checked
24x36: 60.96×91.44 cm, 864 sq in, 6.00 sq ft, bathroom / small bedroom. Half a 36×48 in window by area — the smallest standard size in the chart.
30x36: 76.20×91.44 cm, 1,080 sq in, 7.50 sq ft, bedroom. A little wider than the bathroom size, for a small bedroom.
36x36: 91.44×91.44 cm, 1,296 sq in, 9.00 sq ft, bedroom. Square, and three quarters of a 36×48 in window by area.
36x60: 91.44×152.40 cm, 2,160 sq in, 15.00 sq ft, living room. Tall and narrow — the same width as the default, a foot taller.
48x48: 121.92×121.92 cm, 2,304 sq in, 16.00 sq ft, living room. Square and a third bigger than the default by area.
48x60: 121.92×152.40 cm, 2,880 sq in, 20.00 sq ft, living room. Tall and narrow, 1.67× the default by area.
60x48: 152.40×121.92 cm, 2,880 sq in, 20.00 sq ft, living room. Wide and short — the same 20.00 sq ft as the 48×60 in window, turned on its side.
72x48: 182.88×121.92 cm, 3,456 sq in, 24.00 sq ft, living room / picture window. Twice a 36×48 in window by area — the biggest standard size in the chart.
Output · formula · meaning
| Output | Formula | What it means |
|---|---|---|
| Size in inches | table row | 36×48 in for the default. |
| Centimetres | inches × 2.54 | 91.44×121.92 cm for 36×48 in. |
| Area in square inches | width × height | 1,728 sq in for 36×48 in. |
| Area in square feet | area sq in ÷ 144 | 12.00 sq ft for 36×48 in. |
| Typical room | table row | bedroom / living room for 36×48 in. |
| 24x36 | table row | 24×36 in, 60.96×91.44 cm, 864 sq in, 6.00 sq ft, bathroom / small bedroom. |
| 30x36 | table row | 30×36 in, 76.20×91.44 cm, 1,080 sq in, 7.50 sq ft, bedroom. |
| 36x36 | table row | 36×36 in, 91.44×91.44 cm, 1,296 sq in, 9.00 sq ft, bedroom. |
| 36x60 | table row | 36×60 in, 91.44×152.40 cm, 2,160 sq in, 15.00 sq ft, living room. |
| 48x48 | table row | 48×48 in, 121.92×121.92 cm, 2,304 sq in, 16.00 sq ft, living room. |
| 48x60 | table row | 48×60 in, 121.92×152.40 cm, 2,880 sq in, 20.00 sq ft, living room. |
| 60x48 | table row | 60×48 in, 152.40×121.92 cm, 2,880 sq in, 20.00 sq ft, living room. |
| 72x48 | table row | 72×48 in, 182.88×121.92 cm, 3,456 sq in, 24.00 sq ft, living room / picture window. |
| Reverse: 12.00 sq ft | area ÷ 144, matched to a row | 36×48 in. |
| Reverse: 6.00 sq ft | area ÷ 144, matched to a row | 24×36 in. |
| Reverse: 24.00 sq ft | area ÷ 144, matched to a row | 72×48 in. |
| Reverse: 20.00 sq ft | area ÷ 144, matched to a row | 48×60 in or 60×48 in (width decides). |
| Reverse: 9.00 sq ft | area ÷ 144, matched to a row | 36×36 in. |
| Reverse: 15.00 sq ft | area ÷ 144, matched to a row | 36×60 in. |
| 72x48 vs 36x48 | area ÷ area | 2.00× (24.00 ÷ 12.00). |
| 36x48 vs 24x36 | area ÷ area | 2.00× (12.00 ÷ 6.00). |
| 48x60 vs 36x48 | area ÷ area | 1.67× (20.00 ÷ 12.00). |
Who uses this
- The homeowner replacing a window: they learn a 36×48 in window is 91.44×121.92 cm and 12.00 sq ft — so they know the size to order, and they check the 24×36 in row at 6.00 sq ft before ordering a bathroom window.
- The builder pricing a living room: they learn a 72×48 in picture window is 24.00 sq ft — so they know it is twice a 36×48 in window by area, and they check the 48×60 in row at 20.00 sq ft before going bigger.
- The renter measuring a window for blinds: they learn a 36×36 in window is 91.44×91.44 cm and 9.00 sq ft — so they know the blind size to buy, and they check the width-first order (48×60 in is tall, 60×48 in is wide) before measuring.
- The measurer with a tape: they learn a 12.00 sq ft window is 36×48 in and a 20.00 sq ft window is 48×60 in or 60×48 in — so they can name any window from its area, and they check the width when the area alone is not enough.
Accuracy & limitations
The sizes are the standard US window sizes: width first, height second, in inches, with centimetres from inches times 2.54 and areas from width times height divided by 144. Real windows vary by a fraction of an inch with the maker, and the rough opening is bigger than the window itself — always measure the opening and check the maker’s spec sheet before ordering. The “typical room” column is a guide, not a rule: a 36×48 in window fits a bedroom or a living room, and a 24×36 in window fits a bathroom or a small bedroom, but the right size depends on the wall, the light and the local code. This is not a U-factor or energy chart and not a window-installation chart: energy performance and installation are separate lookups. For the blinds that cover the window, see blind size chart; for the header above it, see door header size chart.
Cite this reference tableBright Side Kit. “Window Size Chart: Standard Window Sizes & Dimensions.” brightoolbox.com, 2026. Method: cm = inches × 2.54; area sq in = width × height; area sq ft = area sq in ÷ 144. Defaults: 36x48 in → 91.44x121.92 cm, 1,728 sq in, 12.00 sq ft, bedroom / living room. Rows: 24x36 → 60.96x91.44 cm, 864 sq in, 6.00 sq ft, bathroom / small bedroom; 30x36 → 76.20x91.44 cm, 1,080 sq in, 7.50 sq ft, bedroom; 36x36 → 91.44x91.44 cm, 1,296 sq in, 9.00 sq ft, bedroom; 36x48 → 91.44x121.92 cm, 1,728 sq in, 12.00 sq ft, bedroom / living room; 36x60 → 91.44x152.40 cm, 2,160 sq in, 15.00 sq ft, living room; 48x48 → 121.92x121.92 cm, 2,304 sq in, 16.00 sq ft, living room; 48x60 → 121.92x152.40 cm, 2,880 sq in, 20.00 sq ft, living room; 60x48 → 152.40x121.92 cm, 2,880 sq in, 20.00 sq ft, living room; 72x48 → 182.88x121.92 cm, 3,456 sq in, 24.00 sq ft, living room / picture window. Reverses: 12.00 sq ft → 36x48; 6.00 sq ft → 24x36; 24.00 sq ft → 72x48; 20.00 sq ft → 48x60 or 60x48 (width decides); 9.00 sq ft → 36x36; 15.00 sq ft → 36x60. Extras: a 72x48 window is 2.00x a 36x48 (24.00 vs 12.00 sq ft); a 36x48 is 2.00x a 24x36 (12.00 vs 6.00 sq ft); a 48x60 is 1.67x a 36x48 (20.00 vs 12.00 sq ft). This is not a U-factor/energy or window-installation chart.
Bright Side Kit. "Window Size Chart: Standard Window Sizes & Dimensions." https://brightoolbox.com/window-size-chart/ Accessed October 25, 2026.Frequently asked questions
What is the standard window size for a bedroom?
36×48 in — 91.44×121.92 cm, 1,728 sq in, 12.00 sq ft. A 36×36 in window (9.00 sq ft) also fits a bedroom, and a 30×36 in window (7.50 sq ft) fits a small bedroom.
What size is a 36x48 window in cm?
A 36×48 in window is 91.44×121.92 cm — 36 times 2.54 is 91.44, and 48 times 2.54 is 121.92. Its area is 1,728 sq in, which is 12.00 sq ft.
How many square feet is a 36x48 window?
12.00 sq ft. The area is 36 times 48, which is 1,728 sq in, and 1,728 divided by 144 is 12.00 sq ft. A 72×48 in window is 24.00 sq ft — twice as much.
What is the biggest standard window size?
72×48 in — 182.88×121.92 cm, 3,456 sq in, 24.00 sq ft, the living room / picture window size. It is twice a 36×48 in window by area.
What is the smallest standard window size?
24×36 in — 60.96×91.44 cm, 864 sq in, 6.00 sq ft, for a bathroom or small bedroom. It is half a 36×48 in window by area.
How do I find a window size from its area?
Match the area to a row: 6.00 sq ft is 24×36 in, 9.00 sq ft is 36×36 in, 12.00 sq ft is 36×48 in, 15.00 sq ft is 36×60 in and 24.00 sq ft is 72×48 in. A 20.00 sq ft window is 48×60 in or 60×48 in — the width decides: 48 in wide is tall, 60 in wide is wide.
Is a 48x60 window the same as a 60x48 window?
By area, yes — by shape, no. Both are 2,880 sq in, which is 20.00 sq ft, but a 48×60 in window is tall and narrow and a 60×48 in window is wide and short. The width is written first, so check it before ordering.
Does this chart cover energy ratings or installation?
No. This is a size chart only — it is not a U-factor or energy chart, and it is not a window-installation chart. For the blinds, see the blind size chart, and for the header above the window, see the door header size chart.