OPPO Reno7 A Ruler
Actual size, on screen

What fits on the OPPO Reno7 A screen – and what doesn't

• a CD case (long side)142 mm / 5.59 infits in one go (6.3 mm to spare)
• an index card (long side, 3×5)127 mm / 5.00 infits in one go (21.3 mm to spare)
• a 4×6 photo (short side)101.6 mm / 4.00 infits in one go (46.7 mm to spare)
• a 4×6 photo (long side)152.4 mm / 6.00 in4.1 mm too long – measure in 2 passes
• a US dollar bill (long side)155.96 mm / 6.14 in7.7 mm too long – measure in 2 passes
• a new pencil190 mm / 7.48 in41.7 mm too long – measure in 2 passes

The OPPO Reno7 A screen in numbers

• The screen is 148.3 mm (5.84 in) tall – 6.1 quarters laid end to end
• 1.73 times the long side of a credit card (85.6 mm)
• There are 162 physical pixels in every centimetre, 411 in every inch
• The finest 1 mm tick is 16.2 pixels apart

Compared with nearby models

Screen height compared with the OPPO Reno7 A (66.7 × 148.3 mm).

• OPPO Reno11 A2024 · 69.7 × 155.5 mm7.3 mm taller

Models with the exact same scale

• Pixel 6
• Galaxy A33 5G
• OPPO Reno9 A

How this ruler stays true to size

The OPPO Reno7 A packs 411 pixels into every inch and draws 2.569 physical pixels per CSS pixel, so one millimetre is 6.30 CSS px. The ticks are rebuilt from that number and the live pixel ratio each time the page opens, which is why no calibration is needed on this model. The right side of the strip is metric (mm/cm) and the left side is inches in 1/16 steps; 1 inch = 25.4 mm.

If the ticks look off (display zoom or font-size settings change the ratio), hold a credit card against the screen – its long side is 85.6 mm – and use the card calibration. The calibration tool and the full device list are in Japanese, but the controls are simple: pick card or coin, drag to match. 日本語版はこちら.