The Two Questions That Separate Them
First: is your face clearly longer than it is wide? Oval and heart faces usually are; a round face isn't. Second: where is it widest? An oval face is widest at the cheekbones, a heart face at the forehead, and a round face is fairly even with full cheeks.
Oval vs Round
The difference is length. An oval face is about one and a half times as long as it is wide; a round face is close to equal. Both have soft, curved jaws. Holding a ruler up to a photo, or measuring from hairline to chin and across the cheekbones, settles it quickly.
Fuller cheeks and weight gain make an oval face read rounder, and weight loss can make a round face read oval, which is why people often find they're 'between' these two.
Oval vs Heart
Both can be longer than wide and both narrow toward the chin. The differences: a heart face is widest at the forehead (an oval face at the cheekbones), and a heart face narrows sharply to a slim or pointed chin, while an oval face narrows gently to a rounded one. A widow's peak hairline is common with heart faces.
Round vs Heart
These are less often confused, but full cheeks on a heart face can make it look round in photos. Check the chin: a round face has a wide, soft chin; a heart face has a narrow one.
Read more: Heart Shaped Face: Signs, Best Haircuts and Famous Examples
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How Common Is Each?
In Ollie's face scan of 4,032 celebrities, oval was the most common shape (22%), heart second (18%) and round sixth (12.2%). Among women, heart was the most common shape of all (26.9%); among men, round (15.2%) was more than twice as common as among women (7%).
See the full guide to all 7 face shapes for the others.
If You're Between Two Shapes
Most people are a mix. Choose cuts that suit both shapes: for oval-round, add a little height and keep the sides soft; for oval-heart, add some fullness around the jaw. The free face scan in Ollie Stylist shows how likely each shape is for your face and scores haircuts against all of them, so a between-shapes face gets advice that works for both.
