Resolution lookup
1920×1080 Aspect Ratio: 16:9 Calculator
Find the 1920×1080 aspect ratio (16:9), see the reduction steps, and calculate resized dimensions without stretching.
1920 × 1080 is a landscape resolution with 2,073,600 pixels. It simplifies to 16:9, not 4:3. It describes pixel dimensions; the ratio describes the frame’s proportions.
Resize With This Ratio — 16:9
Change either side. The other updates proportionally. Results show whole pixels and the exact value before rounding.
Exact height: 1080 px
How the ratio is calculated
1920 ÷ 120 = 16; 1080 ÷ 120 = 9. Dividing both sides by the same value preserves the proportions and gives 16:9. 120 is the greatest common divisor of these dimensions.
Height = width × 9 ÷ 16. Width = height × 16 ÷ 9. These formulas change size without changing shape. They do not crop or pad the source.
Full HD: scaling and framing
A 1280 × 720 export is two-thirds of the original width and height. It preserves 16:9 and contains 921,600 pixels. A 1440 × 1080 output would change the geometry unless you crop or pad. Some legacy video stores non-square pixels, so displayed proportions may differ from stored dimensions. This tool assumes square pixels.
Ratio, resolution and units
A ratio compares width with height; it does not describe file size, compression or image quality. Enter both sides in pixels, inches or another matching unit. This calculator assumes square pixels for digital images. Video with a non-square pixel aspect ratio needs its display aspect ratio checked separately.
16:9 resizing examples
| Width | Exact height | Rounded height |
|---|---|---|
| 320 px | 180 px | 180 px |
| 640 px | 360 px | 360 px |
| 1080 px | 607.5 px | 608 px |
| 1920 px | 1080 px | 1080 px |
Decimal heights are displayed to four decimal places. Rounding can change the final ratio slightly. For an exact integer result, use dimensions that are whole-number multiples of 16:9.