If i turned 59 1/2 last year and withdrew from an IRA all last year, how do I calculate my taxes on the withdrawls?

For a Traditional IRA there is no penalty for withdrawals after you reach 59 1/2, however the withdrawal generally will be taxed as ordinary income.

You should receive a 1099-R that will reflect the withdrawal and TurboTax will guide you through this. 

Distributions from an IRA are reported on Form 1099-R which the administrator of the fund will send in January.

To enter a form 1099-R

• Click on Federal Taxes (Personal using Home and Business)
• Click on Wages and Income (Personal Income using Home and Business)
• Click on I'll choose what I work on (if shown)
• Scroll down to Retirement Plans and Social Security
• On IRA, 401(k), Pension Plan Withdrawals (1099-R), click the start or update button

-follow these link(s) for additional information-

Retirement Plans FAQs regarding IRAs Distributions ...

Managing Your Retirement Account and Taxes ... - TurboTax

What's the difference between a Traditional IRA an...