Hello phharaustt2023,
If your total income for the year (W2, investment income, any other income) will remain same as prior year, you can use your tax rate to estimate how much tax you will pay on your conversion assuming you will remain in same tax bracket. You can also use our tax calculator to estimate total tax liability for the year. If you have TurboTax desktop, you can also create dummy return to see how different conversion amount will impact your taxes. See below links for more info.
https://turbotax.intuit.com/tax-tools/calculators/taxcaster/?srsltid=AfmBOooikQOIA5ThHgfLveBXApvDzM_...
https://blog.turbotax.intuit.com/taxes-101/taxes-101-ira-conversions-1946/
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