Porterhouse vs T-Bone Steak: What’s the Difference?

This website is independent and not affiliated with Miller & Carter. It is a steak cut guide for home cooks in the United Kingdom.

Asked to settle porterhouse vs T-bone steak, the answer comes down to one measurement: the width of the fillet. Both are T bone steaks from the short loin carrying a fillet on one side and a striploin on the other. The porterhouse is cut from the rear of the short loin and carries a much bigger fillet; the T-bone comes from the front and carries a smaller one. Everything else, size, price and serving, follows from that.

Porterhouse vs T-Bone Steak: The One Measurement

According to US meat buying standards (the USDA Institutional Meat Purchase Specifications), a steak only qualifies as a porterhouse if the fillet section measures at least 1.25 inches (about 32mm) across at its widest point. A T-bone’s fillet is between 0.5 and 1.25 inches (13 to 32mm). Anything with less than 0.5 inches of fillet is simply a bone in striploin. In short, all porterhouses are T-bones, but not all T-bones are porterhouses.

The reason is anatomy. The tenderloin is wedge shaped and grows thicker towards the rear of the animal, so cuts taken from the rear of the short loin carry a much larger fillet. A cow yields plenty of T-bones but only a few true porterhouses, which is part of why the porterhouse costs more.

Where Each Cut Comes From

Both cuts come from the short loin, the section of the animal just behind the rib area. A slice through the lumbar vertebra creates the famous T shaped bone. On one side of the bone sits the tenderloin, the long, lean muscle that gives us fillet steak. On the other side sits the top loin, the striploin, known as sirloin in the UK. The T-bone is cut from the front of the short loin, the porterhouse from the rear.

Porterhouse vs T-Bone: Full Comparison

Measurements follow US Institutional Meat Purchase Specifications as cited by several butchery and food guides; exact cuts vary between butchers.

How to Cook a Porterhouse or T-Bone

The method is the same for both: sear over fierce direct heat, 2 to 3 minutes per side, then finish gently until a thermometer reads your target in the thickest part. The one thing to watch is the two sides, which cook at different speeds. The lean fillet side cooks faster, so keep it slightly further from the fiercest heat, and check the temperature on each side separately. Our rump steak cooking guide covers the basic doneness temperatures to aim for.

For a thick porterhouse, the reverse sear method also works well: gentle heat first, then a hard sear. See our guide to reverse searing a steak (note: this page goes live on 17 October 2026 and the link will resolve then). Rest either cut for 10 minutes, then carve the meat off the bone and slice each side across the grain.

Which Should You Buy?

Buy a porterhouse when two people are sharing and you both want the best of both worlds: the tender fillet plus the beefier striploin. It is the showpiece cut for a special occasion, and our guide to porterhouse steak goes deeper on the cut itself (note: this page goes live on 17 October 2026 and the link will resolve then).

Buy a T-bone when you want one generous steak for yourself at a lower price. It gives you the same two muscle experience in a smaller package, and a thinner T-bone cooks through faster on a weeknight.

Do not overthink it. The flavour of the two is closer than the names suggest: same muscles, same bone, different proportions. A great T-bone from a good butcher beats a mediocre porterhouse every time.

Buying Porterhouse and T-Bone in the UK

UK butchers know both cuts, though the porterhouse is the less common of the two on high street counters. Ask whether the steak is an American style porterhouse with a proper fillet: British butchery has sometimes used the word porterhouse for a bone in sirloin without the fillet, which is not the same cut at all. The words striploin and sirloin also differ across the Atlantic: the strip side of a UK T-bone is what British butchers call sirloin. As always, describe the cut you want and ask the butcher to cut it thick, at least 3.5 cm, so the bone does its job.

We could not confirm either cut on the current Miller & Carter menus from official pages, and cuts vary by branch and change over time. Check the latest Miller and Carter menu before visiting.

FAQs

Is a porterhouse better than a T-bone?

It depends what you value. The porterhouse gives you more of the prized fillet, which is why it costs more. The T-bone is the same idea in a smaller, cheaper package. Neither is automatically better eating.

Can a T-bone be as big as a porterhouse?

A T-bone can be cut large, but the fillet stays small because of where it is cut from. Size alone does not make a T-bone a porterhouse: the fillet width is what defines the name.

Which side of the steak cooks first?

The fillet side, because it is leaner. Keep it away from the fiercest heat and use a thermometer on each side rather than timing the whole steak.

Are porterhouse and T-bone available in the UK?

Yes, from good butchers and specialist online sellers. Ask for an American style porterhouse with a proper fillet, since British usage of the word has sometimes meant something different.

Cut information checked against butchery and food guides on 13 October 2026. This website is independent and not affiliated with Miller & Carter.