Enter your head circumference below to find your helmet size instantly, cross-checked against real sizing charts from AGV, Arai, Shoei, HJC, LS2, and more. Helmet sizing isn't standardized across brands — a "Medium" from one manufacturer can run a full size off from another — so getting the number right before you order saves you a return shipment and a helmet that's already too tight by the time you notice on the road.
Measure around the widest part of your head, about 1 cm above your eyebrows.
Between two sizes? Go up — helmets compress slightly as they break in. Always try before buying if possible.
| Size | Circumference (cm) | Circumference (inches) |
|---|
Sizes vary between models within the same brand. Always check the specific model's chart before purchasing.
Reading the chart: match your measured circumference to the closest row, rounding up if you fall between two sizes. Fit also depends on head shape — most Asian-market brands like HJC, LS2, and Shoei are cut for a rounder oval, while European brands like AGV, Arai, and Schuberth run a longer oval. If a helmet feels tight across the forehead and loose at the sides (or vice versa), the size is right but the shape isn't — try a different brand before sizing up or down.