And it’s not just foot length you should be after, but width, too.

Generally, that’s the difference between each successive letter width designation.

Find your measurements again below to convert them to this system.

Close-up of Byrdie editor Jasmine Phillips wearing cuffed jeans and brown ankle boots

Dion Lamar Mills for Byrdie

Can Your Shoe Size Change Over Time?

Lastly, if all else fails, never underestimate the power of a return policy.

A person sitting on a stoop wearing the Tory Burch Cap Toe Flat

Byrdie editor Ali Webb wears outfits featuring cowboy boots and Blundstones at Gov Ball music festival

A person wearing the Veja Campo Sneakers next to a person wearing the Hey Dude Karina Sneaker

Two of the sneakers we recommend for wide feet in front of a hazy background

Several pairs of black, brown, beige, and white shoes on carpet

collage of popular nude heels including Margaux The Heel and others on a gray background

Close-up of woman wearing black Christian Louboutin heels with red bottoms

Three platform sneakers we recommend, including Hoka, Veja, and Superga, on a cream floor

Nike Air Jordan 1 High Method of Make and Veja V-15 High-Top Sneakers on a silk background

Dagne Dover Long Weekend Sale

Tronjori Women High Waist Casual Wide Leg Long Palazzo Pants, Universal Standard Pull On Bootcut Ponte Pants, and Madewell Curvy Harlow Wide-Leg Pant on a fabric background

Collage of popular New Balance Sneakers

Collage of two pairs of Knee-High Boots

Close-up of person wearing light wash denim jeans and shirt

Sustainable Spring Dresses Featuring Doen, Reformation and Christy Dawn Dresses On Models Outdoors

Light wash jeans spilling out of woven basket against orange fabric background