{"schema":"record/v1","id":"art_01M5NCADNBXGYKAJNW28C7G2TH","type":"article","revision":1,"etag":"\"r1.s0\"","title":"What root font size and line-heights do Carbon and USWDS source define, so I can convert their rem tokens to pixels?","summary":"By default both Carbon and USWDS treat 1rem as 16px (Carbon base-font-size 16px with a 100% root; USWDS respects the user's font size, a 16px equivalent), but USWDS can switch to a 10px root, which changes every rem conversion; USWDS line heights are unitless tokens 1-1.75, so pixel line height = font size x token.","status":"active","body":{"text":"By default both Carbon and USWDS treat 1rem as 16px (Carbon base-font-size 16px with a 100% root; USWDS respects the user's font size, a 16px equivalent), but USWDS can switch to a 10px root, which changes every rem conversion; USWDS line heights are unitless tokens 1-1.75, so pixel line height = font size x token.\n\nCurator qualifications: Source read 2026-10-22; nothing compiled. Carbon productive line-height ratios (1.19-1.4) per producer.\n\nLimitations: Source read 2026-10-22; nothing compiled.\n\nEvidence status: statements located in the cited sources by a correlated desk review (Claude); not executed; not independently reviewed.","citations":[{"url":"https://github.com/carbon-design-system/carbon/blob/571cd549545dd156e11f06fd046eb14efa6a61c3/packages/layout/scss/_convert.scss","note":"carbon packages/layout/scss/_convert.scss L15-27; carbon packages/type/scss/_reset.scss L23; uswds settings/_settings-typography.scss L22-50; uswds functions/units/_root.scss L8-12; uswds tokens/font/line-height.scss"},{"url":"https://github.com/carbon-design-system/carbon/blob/571cd549545dd156e11f06fd046eb14efa6a61c3/packages/type/scss/_reset.scss","note":"carbon packages/layout/scss/_convert.scss L15-27; carbon packages/type/scss/_reset.scss L23; uswds settings/_settings-typography.scss L22-50; uswds functions/units/_root.scss L8-12; uswds tokens/font/line-height.scss"},{"url":"https://github.com/carbon-design-system/carbon/blob/571cd549545dd156e11f06fd046eb14efa6a61c3/packages/type/scss/_scale.scss","note":"carbon packages/layout/scss/_convert.scss L15-27; 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USWDS respects the user's font size, a 16px equivalent), but USWDS can switch to a 10px root, which changes every rem conversion; USWDS line heights are unitless tokens 1-1.75, so pixel line height = font size x token.\n\nCurator qualifications: Source read 2026-10-22; nothing compiled. Carbon productive line-height ratios (1.19-1.4) per producer.\n\nLimitations: Source read 2026-10-22; nothing compiled.\n\nEvidence status: statements located in the cited sources by a correlated desk review (Claude); not executed; not independently reviewed.","citations":[{"url":"https://github.com/carbon-design-system/carbon/blob/571cd549545dd156e11f06fd046eb14efa6a61c3/packages/layout/scss/_convert.scss","note":"carbon packages/layout/scss/_convert.scss L15-27; carbon packages/type/scss/_reset.scss L23; uswds settings/_settings-typography.scss L22-50; uswds functions/units/_root.scss L8-12; uswds tokens/font/line-height.scss"},{"url":"https://github.com/carbon-design-system/carbon/blob/571cd549545dd156e11f06fd046eb14efa6a61c3/packages/type/scss/_reset.scss","note":"carbon packages/layout/scss/_convert.scss L15-27; carbon packages/type/scss/_reset.scss L23; uswds settings/_settings-typography.scss L22-50; uswds functions/units/_root.scss L8-12; uswds tokens/font/line-height.scss"},{"url":"https://github.com/carbon-design-system/carbon/blob/571cd549545dd156e11f06fd046eb14efa6a61c3/packages/type/scss/_scale.scss","note":"carbon packages/layout/scss/_convert.scss L15-27; 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