Does Altra run true to size?

Altra women's shoes, by its own chart

True to size by its chart

By its own size chart, Altra is true to size: each size is built for about the same foot length as the median of 14 other brands' charts. Start with your usual size.

Source: Altra size guide, checked 2026-09-17.

Convert your size to Altra Altra products and size chart

If you wear this at another brand, buy this at Altra

US women's sizes. Each cell reads the other brand's own chart, then finds the Altra size built for the same foot (or the same label, when one chart has no foot lengths).
You wear	Size 7 there	Size 8 there	Size 9 there
Nike	Altra 7.5	Altra 8.5	Altra 9.5
adidas	Altra 7.5 or 7	Altra 8	Altra 9
HOKA	Altra 7	Altra 8	Altra 9
Brooks	Altra 7	Altra 8	Altra 9
ASICS	Altra 7.5	Altra 8.5	Altra 9 or 9.5
New Balance	Altra 7.5	Altra 8.5	Altra 9.5
On	Altra 7.5	Altra 8.5	Altra 9.5
Saucony	Altra 7	Altra 8	Altra 9

Every size, not just these three: follow a brand name for the full Altra table.

Size by size: Altra against the other charts

The foot length Altra builds each US women's size for, beside the median of every other brand that publishes one. Half a US size is 0.42 cm.
US women's	Altra builds it for	Median brand	Difference
6	22.5 cm	23 cm (14 brands)	-0.50 cm
6.5	23 cm	23.5 cm (13 brands)	-0.50 cm
7	23.5 cm	24 cm (14 brands)	-0.50 cm
7.5	24 cm	24.2 cm (13 brands)	-0.20 cm
8	24.5 cm	24.55 cm (14 brands)	-0.05 cm
8.5	25 cm	25 cm (12 brands)	same
9	25.5 cm	25.5 cm (14 brands)	same
9.5	26 cm	26 cm (12 brands)	same
10	26.5 cm	26.5 cm (14 brands)	same

Tinted rows differ by half a size or more. Brands round their foot lengths, often to the half centimetre, so read the average, not a single row.

What a size chart cannot tell you

A chart gives one number per size: the foot length. Width, toe box shape, the heel and how much the upper stretches are on no chart, and they decide whether a shoe feels short. That is why people sometimes say a brand runs small when its chart says it runs long: a narrow toe box can crowd a foot the chart says fits.

If you have wide feet or sit between sizes, take the larger size, or check whether the model comes in a wide fit.

Wearer reports appear on the shoe converter once five people who own both brands have told us what fits. They rank above the charts, because charts describe a shoe and wearers describe a fit. Add a pair you own to help.