Adafruit BME280 breakout (original) — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/adafruit-bme280-breakout-original/  (CC BY 4.0)
Basis: Adafruit (Eagle board file)
Catalog version: 2026-10-20

Overall (mm): length 17.78, width 19.05
- Adafruit BME280 breakout (original): 17.78 × 19.05 mm. The original 0.7 × 0.75 in board. The current STEMMA QT version is larger (about 25.4 × 17.8 mm per resellers).
- Mounting holes: 2 × Ø2.2 mm, 12.70 mm apart, 2.54 mm in from the top edge. Hole centres are measured from the lower-left corner.
- The file is the outline with the holes; components and connectors are not modelled.

dimension  value
size  17.78 × 19.05 mm (board outline)
mounting holes  2 × Ø2.2 mm, 12.70 mm apart, 2.54 mm in from the top edge

Files elsewhere (not hosted by Xem Studio; license as stated by the publisher):
- Adafruit: Adafruit BME280 breakout (original) — web — Publisher's page; dimensions are facts — https://github.com/adafruit/Adafruit-BME280-Breakout-PCB/blob/master/Adafruit%20BME280.brd

Free files (CC BY 4.0, Xem Studio; STEP + STL, 1 parts): https://xemstudio.com/files/hardware/adafruit-bme280-breakout-original/index.json
API: https://xemstudio.com/api/geometry?object=adafruit-bme280-breakout-original