# Omnipod: auto-calc by PDM or manual bolus calculations?

**URL:** <https://forum.fudiabetes.org/t/omnipod-auto-calc-by-pdm-or-manual-bolus-calculations/3088>\
**Category:** Pump\
**Tags:** omnipod\
**Created:** [January 4, 2018, 4:25am UTC](https://forum.fudiabetes.org/t/omnipod-auto-calc-by-pdm-or-manual-bolus-calculations/3088 "2018-01-04T04:25:29Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![Michel](https://yyz2.discourse-cdn.com/flex030/user_avatar/forum.fudiabetes.org/michel/32/387_2.png) [@Michel](https://forum.fudiabetes.org/u/Michel)\
**Post date:** [January 4, 2018, 4:28am UTC](https://forum.fudiabetes.org/t/omnipod-auto-calc-by-pdm-or-manual-bolus-calculations/3088/2 "2018-01-04T04:28:03Z")

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> [@PDM fails at math?](https://forum.fudiabetes.org/t/pdm-fails-at-math/3051/23):
>
> Or you don’t use the calcs at all?

We never enter a BG number for the basis of a correction, and we never enter carbs either. We always calculate the bolus ahead, then enter it. So, if I understood the post correctly, it is always possible to extend the bolus, and we never see this discrepancy.

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