Compare Fonts → Sans Serif → Raleway vs Saira

Raleway vs Saira

Both are sans serif faces on Google Fonts. Raleway has the larger x-height, so it looks bigger at the same size. Saira takes more horizontal space.

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Raleway

Handgloves & Quartz Jockeys

The quick brown fox jumps over the lazy dog. Pack my box with five dozen liquor jugs, then ship it to 1,842 Grove Street by 9:30 AM.

Handgloves & Quartz Jockeys

The quick brown fox jumps over the lazy dog. Pack my box with five dozen liquor jugs, then ship it to 1,842 Grove Street by 9:30 AM.

Measured from the font files. Heights and widths are shown as a share of the font size, so they compare directly at any point size.
Measurement	Raleway	Saira	Difference
x-heightHeight of lowercase letters, as a share of the font size. Higher reads larger at the same point size.	51.9%	51.0%	0.9%
Cap heightHeight of capitals, as a share of the font size.	71.0%	68.8%	2.2%
x-height to cap ratioProportion of lowercase to uppercase. Higher feels more modern and open.	0.73	0.74	0.01
Stroke weightMeasured thickness of a vertical stroke. Higher is heavier on the page.	6.9%	8.2%	1.2%
Stroke contrastHorizontal stroke divided by vertical. 1.0 is even; below 0.5 means strong thick-thin modulation.	0.87	0.85	0.02
Average character widthMean lowercase advance. Higher takes more horizontal space.	52.6%	52.6%	0.1%

Stroke weight: Raleway measures 6.9%, Saira measures 8.2%. Measured thickness of a vertical stroke. Higher is heavier on the page.
x-height: Raleway measures 51.9%, Saira measures 51.0%. Height of lowercase letters, as a share of the font size. Higher reads larger at the same point size.
Stroke contrast: Raleway measures 0.87, Saira measures 0.85. Horizontal stroke divided by vertical. 1.0 is even; below 0.5 means strong thick-thin modulation.