If you're taking 5,000-13,000 steps four days a week (that's a pretty wide range) and otherwise not really moving or exercising much at all, I'd call that mostly sedentary, for the purposes of calculating calories. You didn't say how old you are, but at your weight, without a ton of exercise, 1400-1500 calories is probably not a bad place to start.
Try eating at 1400-1500 calories a day for a month, see how you feel and if you have lost any weight. When you only have a little bit to lose, it will come off very slowly, so it will take a month or more for you to really know whether your plan is effective. Otherwise any fat loss will be masked by daily weight fluctuations (due to fluid retention, undigested food, etc.) and you will be misled. So try to be patient and give it a good solid month before making tweaks to your plan.
The upshot is calculators are all averaged over populations and the only way to know really what will work for you is to do the science experiment on your own body.
You can also try to add some more strenuous exercises, especially weight-bearing or resistance exercises, to help maintain your muscle mass - you don't just want to lose 10 pounds, you want most of that 10 pounds to be fat, not lean mass.
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