Today is the Duchess of Cambridge’s 31st birthday, and what better way to celebrate than with an exhaustive study of her many ensembles?

Appearing in the February issue of British Vogue, Katepedia: A Study in Royal Style is a head-to-toe analysis of 100 outfits worn by the Duchess formerly known as Kate Middleton.

What is her arm-to-sleeve length ratio? On average, how many of her teeth are exposed when she smiles? What’s the diameter of one of her impossibly bouncy curls? For those of you who are dying to know but can’t get your hands on a copy of the UK glossy, we’ve got the by-the-numbers answers — plus a colorful visual aid — from Vogue‘s royal fashion report.

Average cost of outfit on tour: £1,427 ($2,287)

Most common arm-to-sleeve length ratio: 6:1

Go-to neckline: Boatneck — she’s worn it to 42% of her official engagements.

Perfect drop earring length: 33mm (1.3 inches)

Average number of teeth displayed per smile: 8.6

Label most worn on official duty since engagement: LK Bennett

Favorite color: Blue — of the 100 outfits, she wore the hue 24% of the time.

Average curl diameter: 25mm (1 inch)

Can’t wait to see the post-pregnancy edition! What do you think about Duchess Catherine’s sense of style?

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