My body is the only calorie calculator I trust. The rest are just guesstimates and averages and not very accurate for most of us. We frequently see posts from members who are incredibly frustrated because their bodies don't respond the way a calorie calculator says it should. In reality, the problem is with the generic calculator, not the person's body.
If we listen to our bodies, they will tell us everything we need to know about what calorie level will work for weight loss for each of us as unique individuals. My suggestion is to pick a reasonable calorie level to start (like your 1500), track every bite, lick and taste consumed in a week, weigh at the end of the week, then tweak as necessary.
If we're gaining weight (not a day to day fluctuation but weekly gains), then we know that we're in a calorie surplus and taking in more calories than our body burns.
If our weight stays the same, we know that we're in calorie equilibrium and our calories in equal our calories burned.
If we're losing weight, then we know that we're in a calorie deficit, our calories consumed are less than our calories burned, and our bodies are using stored fat for energy (yay!)
Weight loss in the first few weeks can be kind of unusual due to water weight loss, but after a few weeks, things should settle into more of a regular pattern. If your calories and exercise are allowing for a 1 - 2 pound a week loss, then great, stick with it, you're right where you should be!