# Spreadsheet for LoRa airtime calculation

**URL:** <https://www.thethingsnetwork.org/forum/t/spreadsheet-for-lora-airtime-calculation/1190>\
**Category:** Uncategorized\
**Created:** [February 4, 2016, 2:45pm UTC](https://www.thethingsnetwork.org/forum/t/spreadsheet-for-lora-airtime-calculation/1190 "2016-02-04T14:45:50Z")\
**Posts on this page:** 1\
**Showing post:** 4

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**Author:** ![weradis](https://www.thethingsnetwork.org/forum/user_avatar/www.thethingsnetwork.org/weradis/32/45845_2.png) [@weradis](https://www.thethingsnetwork.org/forum/u/weradis)\
**Post date:** [February 4, 2016, 3:58pm UTC](https://www.thethingsnetwork.org/forum/t/spreadsheet-for-lora-airtime-calculation/1190/4 "2016-02-04T15:58:16Z")

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@thomas I think usually at least 13 [MHDR (1) + DevAddr (4) + FCtrl (1) + FCnt (2) + Fport(1) + MIC(4)] in a packet with no options  
@iikaw they payload size is independent from the encryption.

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