{"$schema":"https://toolsly.tools/schemas/tool-manifest-v1.json","generated":"2026-05-20T20:47:38.334Z","discovery":{"catalog":"https://toolsly.tools/tools.json","llmsTxt":"https://toolsly.tools/llms.txt","sitemap":"https://toolsly.tools/sitemap.xml"},"relatedTools":[{"slug":"bmi-calculator","name":"BMI Calculator","url":"https://toolsly.tools/bmi-calculator"},{"slug":"percentage-calculator","name":"Percentage Calculator","url":"https://toolsly.tools/percentage-calculator"},{"slug":"age-calculator","name":"Age Calculator","url":"https://toolsly.tools/age-calculator"},{"slug":"date-difference","name":"Date Difference Calculator","url":"https://toolsly.tools/date-difference"},{"slug":"tip-calculator","name":"Tip Calculator","url":"https://toolsly.tools/tip-calculator"},{"slug":"timezone-converter","name":"Timezone Converter","url":"https://toolsly.tools/timezone-converter"},{"slug":"bytes-converter","name":"Bytes Converter","url":"https://toolsly.tools/bytes-converter"},{"slug":"length-converter","name":"Length Converter","url":"https://toolsly.tools/length-converter"}],"kind":"utility","slug":"aspect-ratio-calculator","name":"Aspect Ratio Calculator","description":"Compute aspect ratios and resize dimensions while preserving the original proportion — 16:9, 4:3, 21:9 and more.","longDescription":"Two modes. Mode 1 — resize while keeping ratio: enter the original width and height plus one new dimension, get the matching dimension that preserves the aspect ratio. Mode 2 — find ratio from dimensions: enter any width and height, get the simplified ratio (e.g. 1920×1080 → 16:9) plus the decimal value. Useful for video aspect ratios (16:9, 21:9), social-media images (1:1, 4:5, 9:16 for Reels/TikTok/Stories), monitor and TV sizing, and responsive design breakpoints. Runs locally in your browser.","category":"calc","categoryName":"Calculators","keywords":["aspect ratio calculator","aspect ratio calculator online","aspect ratio calculator free","ratio calculator","resize while keeping ratio","16:9 calculator","21:9 calculator","screen aspect ratio calculator","image aspect ratio calculator","video aspect ratio calculator","proportional resize calculator","find aspect ratio","width height ratio calculator"],"badge":"Calculator","url":"https://toolsly.tools/aspect-ratio-calculator","inputs":[{"type":"select","key":"mode","label":"Mode","defaultValue":"Resize while keeping ratio","choices":[{"value":"Resize while keeping ratio","label":"Resize while keeping ratio"},{"value":"Find ratio from dimensions","label":"Find ratio from dimensions"}]},{"type":"number","key":"originalWidth","label":"Original width (px)","defaultValue":1920,"min":1,"step":1},{"type":"number","key":"originalHeight","label":"Original height (px)","defaultValue":1080,"min":1,"step":1},{"type":"number","key":"newWidth","label":"New width (px) — leave 0 to derive from new height","defaultValue":0,"min":0,"step":1,"help":"Used only in 'Resize while keeping ratio' mode."},{"type":"number","key":"newHeight","label":"New height (px) — leave 0 to derive from new width","defaultValue":0,"min":0,"step":1,"help":"Used only in 'Resize while keeping ratio' mode."}],"outputs":[{"key":"width","label":"Width"},{"key":"height","label":"Height"},{"key":"ratio","label":"Aspect ratio"},{"key":"decimal","label":"Decimal ratio"}],"invocation":{"webUi":"https://toolsly.tools/aspect-ratio-calculator","api":null,"notes":"Currently invoked via the web UI at `webUi`. Inputs are form fields; outputs are structured text values. A remote MCP/REST API is planned."}}