Wikipedia reports "Curcumin constitutes 3.14% (on average) of powdered turmeric"...

dunham on Jan 24, 2018 | parent | context | favorite | on: Curry spice turmeric boosts memory by nearly 30%, ...

Wikipedia reports "Curcumin constitutes 3.14% (on average) of powdered turmeric"[1]. And the USDA nutrient database reports 1 tbsp ground turmeric weighs 9.4g [2]

I think that works out to 0.295g or 295mg per tbsp (on average).

[1]: https://en.wikipedia.org/wiki/Turmeric [2]: https://ndb.nal.usda.gov/ndb/foods/show/292