No, there isn't a calculator. Many people enter their tax information in TurboTax to get a good estimate. TurboTax then generates Form 1040. The Form 1040 has the 2021 federal total tax liability on Line 24, Total tax.
You could do this if you have an estimate of the amount you earned at the 4th job. Better still, if you have your last paycheck stub, you could enter that information.
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