DataCalc
Aspect Ratio Calculator
Free online aspect ratio calculator. Convert video resolutions, calculate pixel dimensions, and find common aspect ratios for film, TV, and social media formats.
How this calculator works
The Aspect Ratio Calculator converts between aspect ratios, resolutions, and pixel dimensions. Enter any two values — say, a target width and a ratio — and it computes the rest, including matching common delivery resolutions and anamorphic desqueeze math.
It covers the ratios working professionals actually deliver: 16:9 broadcast and streaming, 2.39:1 scope, 1.85:1 flat, 4:3 archival, vertical 9:16 social formats, and custom ratios for LED walls and specialty screens.
Height from width and ratio
Height = Width ÷ Aspect Ratio
Example: 3840 wide at 2.39:1 → 3840 ÷ 2.39 ≈ 1607 px tall.
| Ratio | Name / use | Example resolution |
|---|---|---|
| 16:9 (1.78:1) | HD/UHD broadcast & streaming | 3840 × 2160 |
| 1.85:1 | "Flat" theatrical | 3996 × 2160 (DCI) |
| 2.39:1 | "Scope" widescreen | 4096 × 1716 (DCI) |
| 4:3 (1.33:1) | SD archival, some art-house | 1440 × 1080 |
| 9:16 (0.56:1) | Vertical social video | 1080 × 1920 |
| 2:1 | Streaming-era "Univisium" | 4096 × 2048 |
Frequently asked questions
What resolution is 2.39:1 at 4K?
For DCI 4K delivery, scope is 4096 × 1716. Cropped from a UHD frame, 2.39:1 is 3840 × 1607 (usually rounded to an even 3840 × 1608). The calculator gives you exact and even-number-rounded dimensions.
What is the difference between 4K and UHD?
DCI 4K is 4096 pixels wide (cinema standard); UHD is 3840 × 2160 (the consumer "4K" used by TVs and streaming). They differ in width and native aspect ratio — 1.90:1 versus 16:9.
How does anamorphic desqueeze work?
An anamorphic lens optically squeezes a wide image onto the sensor; in post you multiply the recorded width by the squeeze factor. A 2× anamorphic on a 4:3 sensor yields 2.66:1, which is typically cropped to 2.39:1 for delivery.
Why do my pixel dimensions need to be even numbers?
Most video codecs encode color in 2×2 pixel blocks (4:2:0 chroma subsampling), so odd dimensions are invalid or get silently padded. This calculator can round to even values for you.
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