Gore and disturb are not the same measurement

Almost every film database gives a horror film one number. That number is useless for the only decision the reader is actually making, which is whether to put this on tonight.

Two films, same score

Blood Feast (1963) contains more visible viscera per minute than most films made since. It is also completely harmless. The gore is sheep offal in flat lighting, the acting is community-theatre standard, and nobody in the history of the film has been upset by it for longer than the running time.

The Texas Chain Saw Massacre (1974) has almost no blood in it. Count the on-screen wounds and you will run out of fingers. It is one of the most upsetting films ever made, and the BBFC kept it off British screens for a quarter of a century.

A single ten-point scale cannot express the difference between those two films, and a recommendation built on one will send Chain Saw to somebody who asked for something gory and Blood Feast to somebody who asked for something that would get to them. Both will be disappointed, in opposite directions.

What gore actually measures

Volume and explicitness of physical damage. It is a craft measurement and a content warning, and it correlates with how much a viewer needs a strong stomach.

It correlates with almost nothing else. It does not predict quality, it does not predict tension, and it very specifically does not predict aftermath.

What disturb measures

How long the film stays with you after it finishes. Whether you think about it the next day. Whether you would put it on again.

The films that score highest here divide into two groups, and neither is defined by blood. There are films about real cruelty done to people who cannot avoid it, and there are films that locate the horror in something the viewer already carries: grief, a marriage, a child.

Lake Mungo (2008) is close to bloodless. It is a mock documentary about an Australian family after a drowning, it is barely a horror film for an hour, and there is a shot on a mobile phone in its last twenty minutes that people report thinking about years later. On a single scale it would land around a six. On these axes it is a two for gore and close to a five for disturb, which is a far more useful thing to tell somebody.

Where they do meet

Martyrs (2008) scores high on both, and so does Irréversible (2002), and the fact that this is uncommon is the point. Films that are both extremely graphic and genuinely lasting are rare enough to be worth identifying, and a combined score hides exactly that intersection.

The other three

Dread is sustained tension, which is a different thing from shock. A film can make you jump forty times and generate no dread at all.

Atmosphere is craft: whether the film builds a place you believe in. The Thing is a masterclass and so is Suspiria, and they have almost nothing else in common.

Rewatchability is the one that separates a great horror film from an important one. Irréversible is a serious film and almost nobody watches it twice. The Thing gets an annual outing.

The practical upshot

Sorting by "most disturbing" and sorting by "most gore" should return substantially different lists. On this site they do. If they returned the same list, one of the two axes would be doing no work and should be deleted.