Depending on which A320 are we talking here - Here are things I normally use:
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If flying fenix A320 then it has its own takeoff/landing performance tool on EFB allowing you to calculate performance figures under various conditions (Wet Runway/intersection dep/packs off/anti icing…)
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For FBW A320 neo, I found a unique tool known as “simsmart” which can be purchased at a small fee here (https://www.a320perf.uk/). Allows you to calculate take-off performance on A320 neo specific including reduced runway length departures
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For A321 Neo/A330 neo - Flex
In reality crews will use performance tool on their EFBs or company ipads to calculate performance figures. In some airlines crews can request performance figures via acars from dispatch/operations department.