# BME280 sensor accuracy Barometric readings off

**URL:** <https://forums.pimoroni.com/t/bme280-sensor-accuracy-barometric-readings-off/22846>\
**Category:** Support\
**Created:** [August 31, 2023, 4:48pm UTC](https://forums.pimoroni.com/t/bme280-sensor-accuracy-barometric-readings-off/22846 "2023-08-31T16:48:33Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![LSTEW452](https://avatars.discourse-cdn.com/v4/letter/l/7c8e57/32.png) [@LSTEW452](https://forums.pimoroni.com/u/LSTEW452)\
**Post date:** [August 31, 2023, 4:48pm UTC](https://forums.pimoroni.com/t/bme280-sensor-accuracy-barometric-readings-off/22846/1 "2023-08-31T16:48:33Z")

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BME280 sensor accuracy is off on the Barometric hpa reading which reads 976 and it is actually 1016. Please advise Larry

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**Author:** ![alphanumeric](https://sea2.discourse-cdn.com/flex016/user_avatar/forums.pimoroni.com/alphanumeric/32/2729_2.png) [@alphanumeric](https://forums.pimoroni.com/u/alphanumeric)\
**Post date:** [August 31, 2023, 6:59pm UTC](https://forums.pimoroni.com/t/bme280-sensor-accuracy-barometric-readings-off/22846/2 "2023-08-31T18:59:42Z")

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You may have to correct it for mean sea level? Or take into account a difference in altitude of your comparison reading.