Tax calculator

Hi all, I'm trying to estimate my potential taxes in Japan. I've come across this tax calculator and wondering how accurate the calculations are.

https://www.htm.co.jp/calculators-monthly-payroll-japan.htm

Has anyone used this calculator or have another one to suggest?

Thanks.

I have used that (or something like it) before. Checking the results against my own salary/tax/deductions it seems pretty accurate. Where it differs is in the net amount due to withholding taxes, but that might just be the way my accountant calculates it.
Of course, it does not include the resident tax calculation.