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Such tools are by design inaccurate (using a static formula) but are a good approximation nevertheless.
Here's how you can find out your accurate BMR rate.
Calculate your BMR (by the way, BMR stands for basal metabolic rate) using a BMR calculator. Take the number and write it down. For the next 5 days eat at that rate and see if you are losing weight. If you are losing weight than that means that BMR calculator produced quite an accurate number.
If you are NOT losing weight that means that your BMR is probably lower and that BMR calculator did not calculate near approximate value.
Because when it comes to weight loss it really isn't that complicated....