Calories vs activities

I’ve been on keto for about 5 weeks now, and I am training for a half marathon. I am wondering what your calorie intake is like? I’ve seen people post in other groups their intake is 1000 calories a day but I don’t feel like that’s realistic for me as I have a very active job, I run 20-30km a week and strength train twice a week. I eat about 1900 calories on run days and 1500 calories on off days. I have not lost a significant amount of weight, I average 1-2lbs a week of weight loss. Any advice is helpful!