iPhone Duo Size Comparison

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Quick answer: Folded, the iPhone Duo is 117.8 × 84.1 × 11.3 mm and 254 g. That is 45.6 mm shorter, 6.1 mm wider, and 2.55 mm thicker than the iPhone 17 Pro Max and iPhone 18 Pro Max, which share a 163.4 × 78.0 × 8.75 mm body. Open, the Duo is 117.8 mm tall, 164.6 mm wide, and 5.2 mm thick, with a 7.6-inch inner screen against the Pro Max 6.9-inch display.

The fold changes width, not height. The short side stays 117.8 mm. Opening the phone turns the 84.1 mm width into 164.6 mm and drops the body from 11.3 mm to 5.2 mm. Weight stays 254 g.

Dimensions from Apple's iPhone comparison. Full sheet: iPhone Duo specs.

Same scale

Folded, the Duo is 45.6 mm shorter than the 18 Pro Max

Open, the Duo is 164.6 mm wide and 5.2 mm thick. That width is 1.2 mm past the 18 Pro Max height. Folded width is 1.5 mm inside a credit card.

Folded iPhone Duo is 45.6 mm shorter than the iPhone 18 Pro MaxSame-scale front outlines. Folded Duo 117.8 × 84.1 mm, open Duo 117.8 × 164.6 mm, iPhone 18 Pro Max 163.4 × 78 mm. A dashed mark under the folded phone is a credit card 85.6 mm wide.45.6 mm shorterCard 85.6 mmFolded117.8 × 84.1 mm5.4″ outerOpen117.8 × 164.6 mm7.6″ inner18 Pro Max163.4 × 78 mm6.9″ display
Folded iPhone Duo is 45.6 mm shorter than the iPhone 18 Pro MaxSame-scale front outlines. Folded Duo 117.8 × 84.1 mm, open Duo 117.8 × 164.6 mm, iPhone 18 Pro Max 163.4 × 78 mm. A dashed mark under the folded phone is a credit card 85.6 mm wide.FoldedCard 85.6 mm117.8 × 84.1 mm5.4″ outerOpen117.8 × 164.6 mm7.6″ inner18 Pro Max163.4 × 78 mm6.9″ display
Opening the Duo adds 80.5 mm of width. Height stays 117.8 mm.Folded on the left, open on the right. Gray is height. Black is width.
Opening the Duo adds 80.5 mm of widthHeight 117.8 mm at both ends. Width 84.1 mm folded, Width 164.6 mm open.FoldedOpenHeight 117.8 mmHeight 117.8 mmWidth 84.1 mmWidth 164.6 mm
Opening the Duo adds 80.5 mm of widthHeight 117.8 mm at both ends. Width 84.1 mm folded, Width 164.6 mm open.FoldedOpenHeight 117.8 mmHeight 117.8 mmWidth 84.1 mmWidth 164.6 mm
Folded, the Duo is 2.55 mm thicker than the 18 Pro Max. Open, it is 3.55 mm thinner.Thickness from zero. Open Duo is 0.44 mm thinner than the iPhone Air (5.64 mm).
Folded, the Duo is 2.55 mm thicker than the 18 Pro MaxThickness from zero: folded 11.3 mm, 18 Pro Max 8.75 mm, open 5.2 mm.Folded Duo11.3 mm18 Pro Max8.75 mmOpen Duo5.2 mm0
Folded, the Duo is 2.55 mm thicker than the 18 Pro MaxThickness from zero: folded 11.3 mm, 18 Pro Max 8.75 mm, open 5.2 mm.Folded11.3 mmPro Max8.75 mmOpen5.2 mm0

Weight stays 254 g folded or open. The 18 Pro Max is 249 g. The 17 Pro Max is the same 163.4 × 78 mm body, 8.75 mm thick, at 233 g.

Front outlines share one scale, 1.55 pixels per millimetre. The dashed mark is a credit card 85.6 mm wide. Camera bumps are not drawn. Dimensions from Apple’s iPhone Duo specs. iPhone Duo specs. Overlay any pair in the size comparison tool.

Folded and open millimeters

Model Height Width Thickness Weight Screen
iPhone Duo, folded 117.8 mm 84.1 mm 11.3 mm 254 g 5.4"
iPhone Duo, open 117.8 mm 164.6 mm 5.2 mm 254 g 7.6"
iPhone 17 Pro Max 163.4 mm 78.0 mm 8.75 mm 233 g 6.9"
iPhone 18 Pro Max 163.4 mm 78.0 mm 8.75 mm 249 g 6.9"

The 17 Pro Max and 18 Pro Max share the footprint. The 18 Pro Max is 16 g heavier, at 249 g instead of 233 g.

What that means next to a Pro Max

In a pocket, the folded Duo is the shorter phone. Its 117.8 mm height sits 45.6 mm under the Pro Max's 163.4 mm. It is also the wider phone: 84.1 mm against 78.0 mm, a 6.1 mm difference. Folded thickness is 11.3 mm, which is 2.55 mm more than the Pro Max's 8.75 mm.

Open, do not read the Duo as a taller slab. The 117.8 mm side stays the short side. The body becomes 164.6 mm wide and 5.2 mm thick. That open width is 1.2 mm longer than the Pro Max is tall. The inner screen is 7.6 inches; the Pro Max screen is 6.9 inches.

Weight goes the other way. The Duo is 254 g folded or open. That is 21 g more than the 17 Pro Max and 5 g more than the 18 Pro Max.

The drawing above puts folded, open, and the 18 Pro Max on one scale. Overlay any other pair in the size comparison tool. The full catalog is on the iPhone size chart.

FAQ

How big is the iPhone Duo folded and open?

Folded, the iPhone Duo is 117.8 mm tall, 84.1 mm wide, and 11.3 mm thick. Open, it is 117.8 mm tall, 164.6 mm wide, and 5.2 mm thick. It weighs 254 g either way. The outer screen is 5.4 inches and the inner screen is 7.6 inches.

Is the iPhone Duo bigger than a Pro Max?

Folded, no. It is 45.6 mm shorter than the iPhone 17 Pro Max and iPhone 18 Pro Max, and 6.1 mm wider. Open, the body is 164.6 mm wide by 117.8 mm tall, and the inner screen is 7.6 inches versus the Pro Max 6.9-inch display.

How thick is the iPhone Duo compared with a Pro Max?

Folded, the Duo is 11.3 mm thick. The iPhone 17 Pro Max and iPhone 18 Pro Max are 8.75 mm thick. Open, the Duo is 5.2 mm thick.

Does the iPhone Duo weigh more than a Pro Max?

Yes. The Duo is 254 g. The iPhone 18 Pro Max is 249 g and the iPhone 17 Pro Max is 233 g. The 17 Pro Max and 18 Pro Max share the same 163.4 × 78.0 × 8.75 mm body.