I just went with
Convert kcal to cal - Conversion of Measurement Units
1 kcal = 1000 cal.
The story about the skin problems is just a story i found on the web, nothing more than that. I did not take any of his recommendations.
There is many different advice on daily dosage of EPA and DHA. The concensus seems to be around 500mg per day as a minimum. Here's one example of Americanheart.org
" Evidence from prospective secondary prevention studies suggests that taking EPA+DHA ranging from 0.5 to 1.8 grams per day (either as fatty fish or supplements) significantly reduces deaths from heart disease and all causes. For alpha-linolenic acid, a total intake of 1.5–3 grams per day seems beneficial."
Fish and Omega-3 Fatty Acids
Recommendations for ALA intake, University of Maryland:
Alpha-linolenic acid (ALA)