How many calories do I need for weight loss?

Hi there

Am totally baffled have been trying to figure out how many calories I need for weight loss. Everytime I use a formula or do my basal metabolic rate etc it is different Can someone help?

I am 177 cm tall (5ft 10in)
Female
95 kilos (209 pounds)( need to be about 75–80)
my shoe size is about 10 Australian (12 or 13 US?)
I work in an office pretty much 5 days a week and when I get home run around doing housework and a kid and might go on the treadmill for 30 mins about 2 or 3 times a week. incline 12 and about 4.2 speed….hate running love walking up hills hahaha

I don’t really eat crap I dont drink soft drink or juice I try to drink 3 litres of filtered water a day..have a protein shake in the morning 2 pieces of fruit a turkey and salad sanger for lunch maybe some pumpkin soup, I down little tins of salmon like no tomorrow when I start getting peckish and most likely some source of protein and a salad or stirfry for dinner…..what am I doing wrong? maybe I am not eating enough? Never really had much prob losing weight but since I had my child it just won’t budge!!! HELPPPPPP!!!