Device summary

Samsung

Galaxy M15

OnePlus

12

Full specifications

Full specifications
Basic information
Release year20242024
Starting price——
Display size6.5-inch6.8-inch
Dimensions76.8 mm × 160.1 mm × 9.3 mm75.8 mm × 164.3 mm × 9.2 mm
Weight217 g220 g
Front material——
Back material——
Display
Display technologySuper AMOLED—
Resolution1080 × 23403168 × 1440
Refresh rate90 Hz120 Hz
Peak brightness—4500 nits
Performance
ChipsetMediaTek Dimensity 6100+Snapdragon 8 Gen 3
RAM4 GB, 6 GB12 GB, 16 GB
Storage128 GB256 GB, 512 GB
Expandable storageYesNo
Cameras
Main cameraWide · 50 MP—
Ultra-wide cameraUltra Wide · 5 MP—
Macro cameraMacro · 2 MP—
Front camerasSelfie · 13 MP—
Battery & charging
Wired charging25 W100 W
Wireless charging—50 W
Charging standardSuper Fast ChargingSUPERVOOC; AIRVOOC
Typical capacity6000 mAh5400 mAh
Connectivity
Cellular5G, LTE5G, LTE
Wi‑FiWi-Fi 5Wi-Fi 7
BluetoothBluetooth 5.3Bluetooth 5.4
USBUSB Type-CUSB 3.2 Gen 1 Type-C
NFCYesYes

Key differences

The most meaningful measured gaps in size and weight — not an overall winner.

  • Height

    12

    4.2 mm taller

  • Width

    Galaxy M15

    1 mm wider · minor difference

  • Weight

    Galaxy M15

    3 g lighter · minor difference

  • Thickness

    Very similar thickness

What these size differences mean

Calculated from the dimensions shown, rounded to 0.1 mm and 1 g. Percentages use the smaller measurement as the reference. Fold and rotation settings affect the dimensions compared.

  • Galaxy M15 is 1 mm (1.3% relative to 12) wider. Check this difference against the width of your current device and pocket opening.
  • 12 is 4.2 mm (2.6% relative to Galaxy M15) taller. This describes the body outline; screen diagonal alone does not tell you the overall size.
  • Galaxy M15 is 0.1 mm (1.1% relative to 12) thicker. Cases and camera protrusions can change the clearance you need.
  • Galaxy M15 is 3 g lighter. This is the listed device-weight difference, not a measured comfort rating.

Use these figures to compare physical size. They do not establish one-handed reach, pocket fit, durability or an overall winner.

Size in everyday life

Picture it in your front pocket.

Front pocket reference

2018 US jeans study · 20 brands · 80 pairs · Approx. 32-inch waists

Galaxy M15

12

Sources and measurement notes

Sizometry compares published specifications and calculates differences. These are not hands-on measurements or tests of comfort, performance or pocket fit.

Check the exact model, year, region and configuration on the linked page. References may cover several variants. Folded and unfolded dimensions differ; cases and camera protrusions may change the space a device needs. Drawings share a relative scale and are not calibrated to life size on your screen.

Galaxy M15 vs 12 Size Comparison

User Experience Summary

Galaxy M15

Strengths

  • Unusually large 6,000mAh battery reliably delivers two days of normal use
  • Vibrant AMOLED display rare at this price point
  • Versatile triple-camera setup with a rare ultrawide lens for the budget

Compromises

  • 217g weight is noticeably heavy for a 6.5-inch display
  • Dimensity 6100+ shows occasional dropped frames and waiting times
  • Low-light camera performance and 1080p video are clear compromises

12

Strengths

  • 5400mAh battery with 6-10 hours of screen-on time, owners' most-praised feature
  • 80-100W wired charging delivers full charges in roughly 30-55 minutes
  • Hasselblad-tuned camera system genuinely competitive with Pixel and Galaxy

Compromises

  • IP65 rating trails the IP68 standard on Galaxy, Pixel, and most rival flagships
  • Four-year OS update commitment shorter than Samsung and Google's promises
  • Isolated reports of display flickering or green-line artifacts after specific updates

Compare in Sizometry Tool

See both devices at the same scale.