What is the expected revenue for Jabil in FY '21 
 to mandate more eco-friendly technologies. As a result, OEMs are making a substantial investment into vehicle electrification effort. Jabil's long-standing capabilities and over 10 years of experience and credibility in this space has positioned us extremely well to benefit from this ongoing trend. Turning now to 5G.
5G will transform the way we live, work, play, and educate. As the underlying infrastructure continues to roll out, 5G adoption is accelerating. Jabil is well-positioned to benefit from both the worldwide infrastructural labs and with devices which would be needed to recognize the full potential of a robust 5G network. 5G is also accelerating secular expansion of cloud adoption and infrastructure growth.
This, coupled with the value proposition Jabil offers to cloud hyperscalers, is helping us gain market share in an expanding market evidenced by the significant growth over the last three years. The value proposition that continues to resonate with our customers is our design to those capabilities, which incorporates engineering, manufacturing, and eco-friendly decommissioning of servers, all within co-located facilities. This is incredibly powerful as accelerating cycle times, security, and transparency at every step of the hardware lifecycle become continually more important to our U.S.-domiciled hyperscalers. Shifting now to packaging.
We are uniquely positioned to benefit from the global shift to smart and eco-friendly packaging. As consumers become more informed about the environmental impact of plastic waste, demand for sustainable packaging solutions is accelerating. And then finally, within semi-cap, the demand for semiconductors has never been higher with the accelerated convergence of technologies and the associated data generation and storage needs. Nearly every part of the economy runs on silicone today.
Jabil serves the semi-cap space with end-to-end solutions spanning the front end with design and complex fabrication equipment, along with the back end, the validation, and test solutions. In summary, I'm extremely pleased with the sustainable broad-based momentum under way across the business which has allowed us to deliver much better than expected results in the first half of FY '21. As we turn our attention to the back half of the year and beyond, we fully expect the long-term secular tailwinds that are driving our business to continue. This, coupled with our improving portfolio mix and lower interest and tax expenses, has given us the confidence to meaningfully raise our FY '21 estimates for revenue, core operating income, core margins, and core earnings per share.
We now expect core operating margins to be 4.2% on revenue of approximately $28.5 billion. This improved outlook translates to core earnings per share of approximately $5. And importantly, despite the stronger growth, we remain committed to delivering free cash flow in excess of $600 million for the year. We've been working extremely hard as a team to grow margins, cash flows, and positively impact our interest in tax.
I am very pleased with our team's exceptional execution of our strategy on all fronts. With that, I'll now turn the call over to Adam.
Adam Berry -- Vice President of Investor Relations
Thanks, Mike. As we begin the Q&A session, I'd like to remind our call participants that per our customer agreements, we will not address any customer or product-specific information. We appreciate your understanding and cooperation. Operator, we're now ready for Q&A.
Questions & Answers:
Operator
Thank you, sir. At this time, we'll be conducting the question-and-answer session. [Operator instructions] One moment please while we poll for questions. Our first question today is from Ruplu Bhattacharya of Bank of America.
Please proceed with your question.
Ruplu Bhattacharya -- Bank of America Merrill Lynch -- Analyst
Hi. Thanks for taking my questions and congrats on the strong results. You know, I had a couple of questions, maybe Mark. The first question on the EMS side of your -- you're guiding now to $13.4 billion, that's almost $1
 to mandate more eco-friendly technologies. As a result, OEMs are making a substantial investment into vehicle electrification effort. Jabil's long-standing capabilities and over 10 years of experience and credibility in this space has positioned us extremely well to benefit from this ongoing trend. Turning now to 5G.
5G will transform the way we live, work, play, and educate. As the underlying infrastructure continues to roll out, 5G adoption is accelerating. Jabil is well-positioned to benefit from both the worldwide infrastructural labs and with devices which would be needed to recognize the full potential of a robust 5G network. 5G is also accelerating secular expansion of cloud adoption and infrastructure growth.
This, coupled with the value proposition Jabil offers to cloud hyperscalers, is helping us gain market share in an expanding market evidenced by the significant growth over the last three years. The value proposition that continues to resonate with our customers is our design to those capabilities, which incorporates engineering, manufacturing, and eco-friendly decommissioning of servers, all within co-located facilities. This is incredibly powerful as accelerating cycle times, security, and transparency at every step of the hardware lifecycle become continually more important to our U.S.-domiciled hyperscalers. Shifting now to packaging.
We are uniquely positioned to benefit from the global shift to smart and eco-friendly packaging. As consumers become more informed about the environmental impact of plastic waste, demand for sustainable packaging solutions is accelerating. And then finally, within semi-cap, the demand for semiconductors has never been higher with the accelerated convergence of technologies and the associated data generation and storage needs. Nearly every part of the economy runs on silicone today.
Jabil serves the semi-cap space with end-to-end solutions spanning the front end with design and complex fabrication equipment, along with the back end, the validation, and test solutions. In summary, I'm extremely pleased with the sustainable broad-based momentum under way across the business which has allowed us to deliver much better than expected results in the first half of FY '21. As we turn our attention to the back half of the year and beyond, we fully expect the long-term secular tailwinds that are driving our business to continue. This, coupled with our improving portfolio mix and lower interest and tax expenses, has given us the confidence to meaningfully raise our FY '21 estimates for revenue, core operating income, core margins, and core earnings per share.
 We now expect core operating margins to be 4.2% on revenue of approximately $28.5 billion. This improved outlook translates to core earnings per share of approximately $5. And importantly, despite the stronger growth, we remain committed to delivering free cash flow in excess of $600 million for the year. We've been working extremely hard as a team to grow margins, cash flows, and positively impact our interest in tax.
I am very pleased with our team's exceptional execution of our strategy on all fronts. With that, I'll now turn the call over to Adam.
Adam Berry -- Vice President of Investor Relations
Thanks, Mike. As we begin the Q&A session, I'd like to remind our call participants that per our customer agreements, we will not address any customer or product-specific information. We appreciate your understanding and cooperation. Operator, we're now ready for Q&A.
Questions & Answers:
Operator
Thank you, sir. At this time, we'll be conducting the question-and-answer session. [Operator instructions] One moment please while we poll for questions. Our first question today is from Ruplu Bhattacharya of Bank of America.
Please proceed with your question.
Ruplu Bhattacharya -- Bank of America Merrill Lynch -- Analyst
Hi. Thanks for taking my questions and congrats on the strong results. You know, I had a couple of questions, maybe Mark. The first question on the EMS side of your -- you're guiding now to $13.4 billion, that's almost $1