Product pages give figures without saying what they refer to. Here’s the translation.
Diameter, arc, length: three different measurements
- The diameter is measured flat, from one rib tip to the other. It’s the most honest measurement.
- The arc follows the curve of the canopy. It always gives a bigger number: an umbrella advertised as “110 cm along the arc” is often 98 cm flat.
- The length is that of the closed umbrella. It decides whether it fits in a bag.
When a shop quotes a figure without specifying, it’s usually the arc. Compare like with like.
The four useful sizes
Around 95 cm — one person, pocket size
That’s the size of the minis. You and your bag stay dry if you walk straight. Above your head, no more.
Around 105 cm — one person, everyday use
The best compromise for the city. Wide enough for your shoulders and a backpack, narrow enough to stay manageable in wind and not get in anyone’s way on a pavement.
130 to 150 cm — two people
From 130 cm, two adults fit underneath without squeezing shoulders together. Below that, one of the two always has a wet arm.
160 to 185 cm — golf umbrella
Plenty for two people, or one person and a golf bag. Almost always a straight umbrella, 90 to 125 cm when closed: it won’t fit in a bag.
The size/wind trade-off
The wider the canopy, the more wind it catches. It’s a law of physics, not a manufacturing defect. A big umbrella is ideal in calm rain and a pain in gusts; a 105 cm double-canopy model does the opposite.
If you’re unsure, start from your most frequent journey, not the worst day of the year.
And the height?
Rarely stated, often important. An umbrella 59 cm high when open clears the head of an average-height adult without them having to raise their arm. Dome shapes come down lower over the shoulders: they protect better from sideways rain, but limit your field of view.
In summary
| Use | Diameter |
|---|---|
| In your pocket, as a backup | ~95 cm |
| Every day, one person | ~105 cm |
| For two | 130 to 150 cm |
| Golf, school gate, sidelines | 160 to 185 cm |
See the minis, the storm models and the large umbrellas.