Pork Loin Vs Pork Tenderloin: What's The Difference?

What is pork loin?

Pork loin comes from the back of the pig, running from the shoulder to the hip along the spine. It's a large, wide roast typically 3-5 pounds and 3-4 inches thick at the widest point. The cut includes the longissimus dorsi muscle and is the source of pork chops when cut into 1-inch thick portions. Pork loin can be purchased boneless or bone-in (called a 'rack of pork' when whole). The meat is relatively lean (about 4-6 g of fat per 4 oz serving) with a fat cap on one side that helps keep the meat moist during roasting. Pork loin works best for slow roasting at 325-350 degrees F to medium-doneness (145-150 degrees F internal temperature); total cooking time is typically 1-1.5 hours.

What is pork tenderloin?

Pork tenderloin is a small, thin, cylindrical cut from beneath the spine of the pig (the psoas major muscle). It's one of the most tender muscles on the animal because it does minimal work during the pig's life. Pork tenderloin typically weighs 1-1.5 pounds and is 2-3 inches thick by 12-18 inches long. The shape resembles a small log. The meat is extremely lean (about 3 g of fat per 4 oz serving), the leanest pork cut by weight. Tenderloin cooks much faster than pork loin due to the smaller size; typical cooking time is 20-30 minutes at 425 degrees F. The cut is sometimes confused with whole loin in grocery stores; the cylindrical shape and small size identify tenderloin specifically.

How do pork loin and pork tenderloin compare?

Size and shape differ dramatically: pork loin is wide and flat (3-4 inches thick by 8-10 inches wide); tenderloin is narrow and cylindrical (2-3 inches diameter). Weight differs: loin is 3-5 pounds vs tenderloin's 1-1.5 pounds. Tenderness differs noticeably: tenderloin is the most tender pork cut available; loin is moderately tender but firmer. Fat content differs: loin has 4-6 g fat per serving; tenderloin has 3 g fat (the leanest). Cooking time differs significantly: loin takes 60-90 minutes to roast; tenderloin takes 20-30 minutes. Price differs too: loin is one of the most affordable pork cuts ($3-5/lb); tenderloin costs $6-10/lb due to higher demand and lower yield per pig.

Can you substitute one for the other?

No, pork loin and pork tenderloin can't be directly substituted due to dramatic size and cooking time differences. A recipe calling for pork loin (cooked for 1+ hour) would severely overcook tenderloin into dry, tough meat. A recipe calling for pork tenderloin (cooked for 30 minutes) would leave a pork loin undercooked and unsafe. If you need to substitute, adjust cooking time accordingly: tenderloin needs 20-30 minutes at 425 degrees F; loin needs 60-90 minutes at 325-350 degrees F. For pork chops, slice a pork loin into 1-inch thick portions and cook 4-5 minutes per side. Always cook both cuts to 145 degrees F internal temperature for the recommended USDA safe minimum; let rest 3 minutes before slicing.