640x480 aspect ratio: 4:3 (1.333:1)
640 × 480 reduces to 4:3. The greatest common divisor of 640 and 480 is 160, so 640 ÷ 160 = 4 and 480 ÷ 160 = 3. That is exactly 4:3.
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At a glance
4:3
640 × 480 is exactly 4:3.
- Decimal
- 1.333:1
- Nearest named ratio
- 4:3, exact
- Orientation
- Landscape
- Pixels
- 307,200
- Megapixels
- 0.31
- Greatest common divisor
- 160
How 640 × 480 reduces
- 640 = 1 × 480 + 160
- 480 = 3 × 160 + 0
The last divisor, 160, is the greatest common divisor, so 640 × 480 reduces to 4:3. The method by hand is on the calculator page.
Crop or pad 640 × 480 to common ratios
Whole-pixel downscales
| Divide by | Size | Whole pixels | Nearest whole size |
|---|---|---|---|
| ÷2 | 320 × 240 | yes | same |
| ÷3 | 213.33 × 160 | no | 213 × 160, 0.16% off 4:3 |
| ÷4 | 160 × 120 | yes | same |
| ÷5 | 128 × 96 | yes | same |
| ÷6 | 106.67 × 80 | no | 107 × 80, 0.31% off 4:3 |
| ÷8 | 80 × 60 | yes | same |
| ÷10 | 64 × 48 | yes | same |
Other listed sizes at 4:3
| Size | Scale from 640 × 480 | Whole-number scale | Pixel count |
|---|---|---|---|
| 640 × 480this page's size | 1 | - | 1× |
| 1024 × 768 | 1.6 | no | 2.56× |
| 1280 × 960 | 2 | yes, ×2 | 4× |
| 1440 × 1080 | 2.25 | no | 5.063× |
| 1920 × 1440 | 3 | yes, ×3 | 9× |
Facts about 640 × 480
- 640 × 480 is exactly 4:3: 160 × 4 by 160 × 3.
- 640 × 480 divides into whole pixels by 2, 4, 5, 8 and 10; ÷3 gives 213.33 × 160, which is not whole pixels.
- Among the other listed 4:3 sizes, 1920 × 1440 (×3) and 1280 × 960 (×2) are whole-number multiples of it; 1440 × 1080 (×2.25) and 1024 × 768 (×1.6) are not whole-number scales of it.
- Turned on its side, 640 × 480 becomes 480 × 640 (3:4).
- Cropped to 9:16, 640 × 480 keeps 42.2% (270 × 480); cropped to 16:9 it keeps 75% (640 × 360).
- 640 × 480 is 307,200 pixels (0.31 MP), 0.15 times the pixel count of 1920 × 1080.
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Aspect ratio 4:3 (1.333:1). Exact match for 4:3.
Aspect ratio
4:3
1.333:1
Exact match for 4:3.
- Width ÷ height
- 1.3333
- Height ÷ width
- 0.75
- Shape
- landscape
Your numbers, worked
gcd(640, 480) = 160
640 ÷ 160 = 4
480 ÷ 160 = 3
640 ÷ 480 = 1.3333
Show how the gcd was found
- 640 = 1 × 480 + 160
- 480 = 3 × 160 + 0
Divide the larger side by the smaller, then divide the last divisor by the remainder until the remainder is 0. The last divisor is the gcd.
What each ratio would cut from 640 × 480
The largest centred crop at each ratio, best fit first. Crop rather than stretch.
| Ratio | Fit | Crop to | Lost |
|---|---|---|---|
| 4:3 | Exact | 640 × 480 | 0% |
| 5:4 | Trim width | 600 × 480 | 6.25% |
| 3:2 | Trim height | 640 × 427 | 11% |
| 16:10 | Trim height | 640 × 400 | 16.7% |
| 1:1 | Trim width | 480 × 480 | 25% |
| 16:9 | Trim height | 640 × 360 | 25% |
| 1.91:1 | Trim height | 640 × 335 | 30.2% |
| 2:1 | Trim height | 640 × 320 | 33.3% |
| 4:5 | Trim width | 384 × 480 | 40% |
| 21:9 | Trim height | 640 × 274 | 42.9% |
| 3:4 | Trim width | 360 × 480 | 43.8% |
| 2:3 | Trim width | 320 × 480 | 50% |
| 9:16 | Trim width | 270 × 480 | 57.8% |
| 32:9 | Trim height | 640 × 180 | 62.5% |
Solve the missing side
Pick a ratio, then enter the side you know.
Height is 480. Size 640 by 480 pixels.
Size at 4:3
640 × 480
Height solved, in pixels.
Your numbers, worked
H = W × 3 ÷ 4 = 640 × 3 ÷ 4 = 480
Whole number, so no rounding is needed.
Pixel-exact: a 4:3 size needs the width to be a multiple of 4, and 640 is 160 × 4.
Questions
What aspect ratio is 640x480?
640 × 480 is 4:3 (1.333:1). Dividing both sides by their greatest common divisor, 160, gives 4 and 3. That is exactly 4:3.
How do I resize 640x480 without distortion?
Keep the ratio at 4:3: new height = new width × 3 ÷ 4. Dividing both sides by 2, 4, 5, 8 or 10 keeps whole pixels, for example 64 × 48 at ÷10.
What is 640x480 cropped to 9:16?
A centered 9:16 crop of 640 × 480 is 270 × 480, which keeps 42.2% of the image. Padding it to 9:16 instead gives a 640 × 1138 canvas with 658 px of bars. That canvas is rounded, not exactly 9:16: the exact padded side would be 1137.78 px tall. The smallest exact 9:16 canvas around it is 648 × 1152.
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