T-Bone vs. Porterhouse: Anatomy & Portion Sizes Explained

Both T-bone and porterhouse are short loin steaks with a T-shaped bone dividing two steaks in one:

• On one side: the strip loin (New York strip).
• On the other: the tenderloin (filet mignon).

The difference comes down to where the steak is cut and how much tenderloin you get.

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TL;DR (Quick Take)

• Porterhouse = cut from the rear short loin with a larger tenderloin. It’s the one often marketed as “for two.”
• T-bone = cut from the front short loin with a smaller tenderloin, still generous strip side.
• U.S. spec: At the widest point of the tenderloin side, porterhouse ≥ 1.25 in (32 mm); T-bone ≥ 0.5 in (13 mm).
• Portions: T-bone commonly 16–24 oz (450–680 g); porterhouse 20–32+ oz (570–900+ g) including bone.
• Cook: Use a two-zone grill or reverse-sear to keep the tenderloin from overcooking.

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Anatomy: What’s On Each Side of the “T”

• Strip side (long side): Beefy, moderately marbled, great crust potential.
• Tenderloin side (short side): More tender, leaner, cooks faster.

Where they’re cut:

• T-bone: From the front (anterior) short loin where the tenderloin tapers.
• Porterhouse: From the rear (posterior) short loin where the tenderloin is thick.

In plain English: all porterhouses are T-bones, but not all T-bones qualify as porterhouse.

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Portion Sizes (What Feeds Whom)

Steak	Typical Thickness	Common Weights*	Feeds
T-bone	1–1½ in (2.5–4 cm)	16–24 oz (450–680 g)	1 hungry adult (or 2 light eaters)
Porterhouse	1¼–2 in (3–5 cm)	20–32+ oz (570–900+ g)	2 adults (classic “for two”)

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*Includes bone. The bone accounts for roughly 15–25% of the total weight depending on cut.

Buying tip: For shareable steaks, target 1½–2 inches thick so you can nail crust and doneness without overcooking the tenderloin.

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Cooking Strategy (Don’t Overdo the Tenderloin)

Best overall: Two-zone fire (or reverse-sear).

1. Start on the cool/indirect side to bring the center up gently.
2. Finish with a hard sear over direct heat for crust.
3. Keep the tenderloin farther from the hottest zone whenever possible.

Pull temps (instant-read thermometer):

• Rare 120–125°F (49–52°C)
• Medium-rare 130–135°F (54–57°C)
• Medium 140–145°F (60–63°C)
  Rest 5–10 minutes.
  Food-safety note: USDA guidance for whole-muscle beef is 145°F/63°C with a rest.

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Which One Should You Buy?

• Want more filet on the plate or sharing for two? Go porterhouse.
• Want a big steak with a bit of filet and a huge strip side, usually a bit cheaper? Go T-bone.
• Value play: A thick T-bone often costs less per pound than a porterhouse while still giving you both experiences.

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Carving at the Table (Easy Wow Factor)

1. Run a knife along both sides of the T-bone to separate strip and tenderloin.
2. Slice each muscle across the grain into strips.
3. Reassemble against the bone for presentation, then serve with flaky salt or a spoon of compound butter.

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Buying Checklist

• Spec matters: In U.S. markets, a porterhouse should show a big, clearly wider tenderloin.
• Thickness: Aim for 1¼–1½ in minimum; 2 in is perfect for sharing.
• Marbling: Fine, even flecks across the strip face.
• Packaging: Bright color, minimal purge, tidy trim around the bone.

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Price & Value

• Porterhouse often commands a premium because you’re getting a sizable tenderloin plus the strip.
• T-bone can be a better cost-to-meat ratio, especially if you love the strip side most.

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Frequently Asked Questions

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Final Tip

If you can choose your exact cut, ask for a steak from the rear third of the short loin—that’s where true porterhouses live, with the most generous tenderloin.