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Aspect ratio calculator

Work out aspect ratios, keep them when resizing, and find print sizes from DPI.
Ratios reduce exactly (BigInt). 1366×768 is honestly 683:384, near 16:9Insert sampleClearWidth (px)Height (px)

Those dimensions could not be read.

Enter dimensions first.
Box width (px)Box height (px)

The binding side wins; the other floors to whole pixels, never a half-pixel guess.
Width knownHeight knownKnown width (px)Physical width (in)Physical height (in)

81.6 PPI

Diagonal pixels ÷ diagonal inches. Sqrt is irrational, so PPI is a float shown to one decimal (everything countable in this tool stays exact). Axes: 81.6 × 81.6 per in .
Dots per inch

6.40 × 3.60 in · 16.3 × 9.1 cm
72 DPI96 DPI150 DPI300 DPI600 DPI

Convention reference points: 72/96 are screen conventions, 300 the photo-print standard. "DPI" here means image density; printers lay ink dots differently.

Common resolutions

- VGA640 × 4804:3 era baseline
- HD 7201280 × 72016:9 broadcast HD
- Full HD 10801920 × 108016:9 consumer HD
- 1440p QHD2560 × 144016:9
- 4K UHD3840 × 216016:9, 2× Full HD per axis
- 5K5120 × 288016:9
- 8K UHD7680 × 432016:9, 2× 4K per axis
- Ultrawide 34"3440 × 144043:18, the 21:9-adjacent panel standard

Paper sizes (ISO 216 + US)

- A6105 × 148 mmISO 216, rounded to the mm
- A5148 × 210 mmISO 216
- A4210 × 297 mmISO 216
- A3297 × 420 mmISO 216
- A2420 × 594 mmISO 216
- US Letter215.9 × 279.4 mm8.5 × 11 in exactly
- US Legal215.9 × 355.6 mm8.5 × 14 in exactly

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