{"uid":"cap_ItiH5xFmjwCo5iK8XhBj-","slug":"saylor-innovations-css-rem-to-pixels-converter-f3107158","name":"Saylor Innovations CSS REM-to-Pixels Converter","description":"CSS rem to pixels converter from root font size and rem value","url":"https://saylorinnovations.com/api/accessibility/rem?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","method"],"properties":{"type":{"type":"string","const":"http"},"method":{"enum":["GET"],"type":"string"},"queryParams":{"type":"object","required":["root_px","rem"],"properties":{"rem":{"type":"string","description":"required non-negative rem value (query)"},"root_px":{"type":"string","description":"required positive root font size in CSS pixels (query)"}}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string","const":"json"},"example":{"type":"object","required":["root_font_size_px","rem","pixels","scope_note"],"properties":{"rem":{"type":"number"},"pixels":{"type":"number"},"formula":{"type":"string","description":"Formula used for the calculation"},"scope_note":{"type":"string","description":"What this data covers and what it leaves out"},"root_font_size_px":{"type":"number","description":"Root font size px"}}}}}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.01","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.01/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.01","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.01","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_4Z844siXmxyvimGS6Vmon","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.01","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Converts a CSS rem value to pixels given a root font size, returning the pixel result plus the formula used","exampleAgentPrompt":"How many pixels is 1.25rem when the root font size is 18px?","exampleUseCases":[{"title":"Responsive design pixel calculation","prompt":"My design uses a root font size of 16px — can you tell me how many pixels 2.5rem works out to?"},{"title":"Accessibility audit unit conversion","prompt":"I'm auditing a site where the root font size is set to 14px. Convert 1rem to pixels so I can check if the text meets minimum size requirements."},{"title":"Custom root font size conversion","prompt":"Our app sets the root font size to 20px. What's 0.875rem in pixels?"}],"resultDescription":"A JSON object containing the input rem value, the root font size in pixels, the computed pixel result, the formula used for the calculation (e.g. 'rem × root_px'), and a scope note clarifying what the result covers and any caveats.","failureModes":["Missing required query parameters (root_px or rem) returns an error","Non-numeric or negative rem value causes a validation error","Non-positive root_px value causes a validation error","Payment not included or insufficient results in 402 Payment Required"],"whenToPreferThis":"Use this endpoint when you need a quick, reliable server-side CSS rem-to-pixel conversion with an explicit root font size, especially when building accessibility tools, design validators, or automated layout checkers that need to reason about absolute pixel sizes from relative CSS units.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-21T18:54:31.150Z","isFirstParty":false,"canonicalSlug":"saylor-innovations-css-rem-to-pixels-converter-f3107158"}