Running on your device · 0 bytes uploaded Aspect Ratio & DPI Calculator Exact ratios, ratio-locked resizing, PPI from real physical size, and print sizes — with curated reference tables. Ratios reduce exactly (BigInt) — 1366×768 is honestly 683:384, near 16:9Insert sampleClearWidth (px)Height (px) 16:9 Decimal (w÷h)1.7778Common name16:9Pixels2,073,600Megapixels2.07 MPOrientationlandscapeBox width (px)Box height (px) 1280 × 720 px · scale 2/3 The binding side wins; the other floors to whole pixels — never a half-pixel guess. Width knownHeight knownKnown width (px) 1920 × 1080 px at 16:9 (floored) 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 Next door in Converter - Unit converter (/converters/units) - Color converter & contrast (/color/converter) All converter tools (/converters) Canonical HTML: https://nutter.tools/converters/aspect-ratio Markdown version: https://nutter.tools/converters/aspect-ratio/index.md Plain-text version: https://nutter.tools/converters/aspect-ratio/index.txt Agent index: https://nutter.tools/llms.txt