Compare Fonts → Sans Serif → Nunito vs Karla

Nunito vs Karla

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

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Nunito

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	Nunito	Karla	Difference
x-heightHeight of lowercase letters, as a share of the font size. Higher reads larger at the same point size.	48.4%	47.8%	0.6%
Cap heightHeight of capitals, as a share of the font size.	70.5%	62.8%	7.7%
x-height to cap ratioProportion of lowercase to uppercase. Higher feels more modern and open.	0.69	0.76	0.07
Stroke weightMeasured thickness of a vertical stroke. Higher is heavier on the page.	8.2%	8.0%	0.3%
Stroke contrastHorizontal stroke divided by vertical. 1.0 is even; below 0.5 means strong thick-thin modulation.	0.79	0.85	0.06
Average character widthMean lowercase advance. Higher takes more horizontal space.	50.7%	52.0%	1.3%

x-height to cap ratio: Nunito measures 0.69, Karla measures 0.76. Proportion of lowercase to uppercase. Higher feels more modern and open.
Stroke contrast: Nunito measures 0.79, Karla measures 0.85. Horizontal stroke divided by vertical. 1.0 is even; below 0.5 means strong thick-thin modulation.
Average character width: Nunito measures 50.7%, Karla measures 52.0%. Mean lowercase advance. Higher takes more horizontal space.