An easy rule of thumb is a person's maintenance calories i.e. how much they eat to maintain their current bodyweight is,
For example, a 200 pound person would be eating 3,000 calories per day to maintain that 200 pounds.
It's not ironclad as some people are more active so they might eat more, or some are really sedentary so they might eat less, but it's a very good starting point. (I can't remember where this originally comes from, but it's one of those old folklores of exercise science that has merit.)
From that, one's bodyweight * 10 is a good starting point for losing weight. As you've seen, your bodyweight, 171 lbs, multiplied by 10, gets you to ~1700 calories, which is what the calculators have told you.
Pretty much every client of mine I've gone over this with has your initial reaction, "That seems like a lot of calories."
That's not surprising though. The numbers jump all over the place, but on average people will underestimate how much they eat so much it's not scientifically valid to even ask people in a research study for their own assessment.
- One study showing people may underreport anywhere from 300 to 800 kcal per day
Simpler = Less likely to trick yourself
This is a long way of saying I wouldn't bother with trying to get that fancy with your eating. Like trying to change it day to day based on whether you workout.
Because the other issue then is properly estimating how many calories you burn from a workout.
This is where again people are way off the mark, but this time in their overestimation.
For instance, many calculators will ask how many minutes the person worked out and at what intensity.
People invariably misjudge how intense the workout was in absolute terms. To them it might feel hard, but the calculator's version of hard may mean bordering on a professional athlete's intensity.
Next, the person will put in e.g. one hour of lifting weights. Sure, they were at the gym for an hour, but they weren't actually lifting weights that entire time.
Finally, there are only so many calories you can burn in a day from activity. After about 400 calories, the body starts to compensate in other ways to minimize how many calories over the course of a day that will be burned.
There are all kinds of ways we trick ourselves with eating. Telling people a granola bar is low fat will actually end up causing people to eat more than if they aren't told that. People knowing or subconsciously say to themselves "It's low fat, so I don't have to worry as much about how much of it I eat." (The Dieter's Paradox.)
Lastly, focusing on how many carbs, protein, fat, calories, manipulating it day to day, that is for many asking a lot.
When you factor in a job or school, social events, being that particular gets very hard.
It's just much, much easier to eat a given amount each day. It's better to not even open the door to "Well, I exercised a lot today, so I can eat..."