1) Use About This Mac

Choose About This Mac from the Apple menu () in the upper-left corner of your screen. About This Mac shows an overview of your Mac, including the name and version of its operating system, its model name, and its serial number:

2) Look under your Macbook for the Model Number, it starts with "A" and in small letters near the hinge area.

New Macbook 12" - A1534

Macbook Air 11"        - A1465 / A1370

Macbook Air 13"        - A1466 / A1369

Mcbook Pro 13 Retina - A1502 / A1425

Mcbook Pro 15 Retina - A1398

New MacPro 13 Touch - A1706

New MacPro 13 No Bar- A1708

New MacPro 15 Touch - A1707

Pro 13" Unibody/DVD - A1278

Pro 15" Unibody/DVD   - A1286

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Select "New Macbook 12" from the Macbook Model Menu

Macbook 12

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Select "Macbook Air 11" from the Macbook Model Menu

Macbook Air 11

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Select "Macbook Air 13" from the Macbook Model Menu

Macbook Air 13

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Select "Mcbook Pro 13 Retina" from the Macbook Model Menu

Macbook Pro 13 Retina

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Select "New MacPro 13 No Bar  or New MacPro 13 Touch" from the Macbook Model Menu

Macbook Pro 13 2016 No Bar / Touch Bar

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Select "Pro 13 Unibody/DVD" from the Macbook Model Menu

Macbook Pro 13 Unibody/DVD

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Select "Mcbook Pro 15 Retina" from the Macbook Model Menu

Macbook Pro 15 Retina

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Select "New MacPro 15 Touch" from the Macbook Model Menu

Macbook Pro 15 2016 Touch Bar