The 3 Types of Fingerprints, 8 Hidden Subtypes and How to Find Yours

Look closely at your fingertip. Those tiny ridges formed before you were born. They will never change shape for the rest of your life.

Yet almost every fingerprint falls into one of just three families. Experts call them loops, whorls and arches. Inside those families sit eight subtypes that police examiners have used for more than a century.

This guide walks you through all the types of fingerprints and shows which ones are common or rare. You’ll also learn to read your own pattern with nothing more than a pencil and some tape.

The 3 types of fingerprints at a glance

Pattern	What it looks like	Deltas	How common	Subtypes
Loop	Ridges enter from one side, curve back and exit the same side	1	Most common, about 65%	Ulnar loop, radial loop
Whorl	Ridges form circles, spirals or ovals around a center	2 or more	About 30%	Plain whorl, central pocket loop, double loop, accidental
Arch	Ridges flow in one side, rise like a wave and exit the other side	0	Least common, about 5%	Plain arch, tented arch

A delta is a small triangle where ridges split and flow around the pattern. Counting deltas is the quickest way to tell the three types of fingerprints apart.

The 8 fingerprint patterns hiding inside the 3 types

The FBI’s classic manual The Science of Fingerprints splits the three families into eight patterns. Examiners still use these names today.

Loops: the everyday pattern

In a loop the ridges enter from one side of the finger. They curve around a center and leave from the same side they came in. Every loop has exactly one delta.

Loops get their names from the two bones of your forearm.

• Ulnar loop: opens toward your little finger, the side of the ulna bone. The NIJ Fingerprint Sourcebook notes that more than half of all fingerprint patterns are ulnar loops.
• Radial loop: opens toward your thumb, the side of the radius bone. It’s far less common.

Whorls: circles and spirals

Whorls look like tiny targets or galaxies. The ridges circle a central point. Every whorl has at least two deltas.

• Plain whorl: at least one ridge makes a full circuit, like a bullseye or a spiral.
• Central pocket loop whorl: looks like a loop at first glance. Look closer and a small whorl sits tucked inside the center.
• Double loop whorl: two separate loops wrap around each other like the yin and yang symbol. Some people call it a twin loop.
• Accidental whorl: a mix of two pattern types, or a pattern that fits no other rule. It’s the catch-all for unusual prints.

Arches: the rare wave

Arches are the simplest pattern. The ridges flow in on one side and rise in the middle before flowing out the other side. A plain arch has no delta at all.

• Plain arch: a gentle, smooth wave across the finger.
• Tented arch: the center rises sharply into a peak, like a tent pole pushing up fabric. It can look almost like a loop but misses one of the loop’s features.

So what’s the difference between a plain arch and a tented arch? It comes down to height and sharpness: a plain arch rolls while a tented arch spikes.

Why three? It depends on who’s counting

The number of fingerprint types isn’t a law of nature. It’s a way of sorting that has changed over time.

In 1823 the Czech scientist Jan Purkinje described nine finger patterns. In 1892 Francis Galton boiled them down to three basic groups. Scotland Yard adopted Edward Henry’s version of Galton’s system in 1901.

Today the Galton Henry system is the most widely used method, and its FBI version recognizes eight pattern types. Many Spanish speaking countries still use a separate system created by Juan Vucetich. So “three types” is the standard answer and “eight patterns” is what examiners actually record.

What is the most common fingerprint pattern?

Loops win by a wide margin. The FBI manual puts loops at about 65% of all prints and whorls at about 30%. That leaves arches as the least common type at roughly 5%.

Those numbers shift from group to group. A 2019 study of 196 adults in Nepal found loops on 52.7% of fingers and arches on 15.3%. So treat any single percentage as a rough guide rather than a rule.

So which fingerprint pattern is the rarest? Among the main types it’s the arch.

Mixed patterns are scarce too. The Nepal team found composite prints on just 4.6% of fingers.

Core, delta and ridge count: how experts read a print

Examiners don’t just glance at a print and guess. They look for a few fixed landmarks that the FBI manual defines.

Landmark	What it is	Why it matters
Core	The rough center of the pattern	The starting point for counting ridges
Delta	The point where ridges split around the pattern, often a small triangle	Tells the type: 0 for a plain arch, 1 for a loop, 2 or more for a whorl
Type lines	The two innermost ridges that run side by side, then spread apart around the pattern	Mark the edges of the pattern area
Ridge count	The number of ridges crossing an imaginary line from delta to core	Separates loops of the same type from each other

Modern scanners go further and map tiny ridge details called minutiae. That’s why a phone sensor can tell your two loops apart from a stranger’s. Our guide to biometric authentication methods explains how that matching works.

What type of fingerprint do I have? A 2 minute test

You don’t need a lab. You need a soft pencil, clear tape and a sheet of white paper.

1. Scribble a dark patch of graphite on the paper.
2. Rub your fingertip across the patch until it turns gray.
3. Press a strip of clear tape onto your fingertip, then peel it off slowly.
4. Stick the tape on clean white paper. Your print appears in sharp detail.
5. Count the deltas. None means arch. One means loop. Two means whorl.
6. For a loop, check which way it opens. Toward your little finger means ulnar. Toward your thumb means radial.

A phone camera in macro mode works too. Good light from the side makes the ridges pop.

Don’t be surprised by mixed results. Your ten fingers don’t have to match. Many people find loops on some and whorls on others.

Types of thumbprints

Thumbprints follow exactly the same system. A thumb can carry a loop or a whorl or an arch just like any other finger.

The only twist is size. A thumb has a bigger pad that makes its pattern look larger and easier to read. That’s why the thumb is the easiest place to start the pencil test.

Why your fingerprint type is set before birth

Your pattern was decided in the womb. The NIJ Fingerprint Sourcebook says the first ridges appear around week 10 of pregnancy. By about week 17 the fine details are locked in for life.

The shape of a small pad on each fetal fingertip seems to steer the result. A high and rounded pad tends to produce a whorl.

A pad that leans to one side tends to make a loop. A low pad tends to make an arch.

In 2023 scientists finally showed how the ridges themselves form. A team led by James Glover and Denis Headon reported in Cell that ridges spread in waves from a few starting points on the fingertip. Where and when those waves start and meet decides whether you end up with a loop, a whorl or an arch.

Do identical twins share fingerprint types?

They often do. But they don’t share the same print.

A study of 227 twin sets found that identical twins had the same pattern type on about 67% of matching fingers. Unrelated people were expected to match on only about 27%. The fine ridge details still differed enough to tell every twin apart.

A handful of people have no fingerprints at all. Researchers traced this rare condition called adermatoglyphia to a gene named SMARCAD1. It has been nicknamed “immigration delay disease” because border scanners can’t read these fingers.

Types of fingerprints and what they mean: real science or myth?

Search online and you’ll find claims that loops mean easygoing, whorls mean independent and arches mean practical. Some companies even sell fingerprint tests that promise to reveal a child’s talents. Here’s what the evidence says on both sides.

The case for a link. Fingerprints are fixed early in pregnancy. Some researchers think they may carry clues about how we develop. A 2022 study in Cureus of 200 medical students in India reported links between certain patterns and Myers Briggs personality types.

The case against. That study’s authors admit their groups were uneven and some categories were tiny. The Indian Psychiatric Society has spoken out against commercial fingerprint intelligence tests.

“is not based on scientific evidence”

Indian Psychiatric Society, on fingerprint intelligence tests

Where does that leave you? Fingerprint patterns are proven tools for identifying people. Whether they say anything about who you are is still an open question for you to weigh.

Fingerprint types: quick answers

What are the 3 types of fingerprints?

Loops, whorls and arches. Loops have one delta, whorls have two or more and plain arches have none.

What is the most common fingerprint pattern?

The loop is most common. The ulnar loop that opens toward the little finger leads the pack. Loops make up roughly 65% of prints in the FBI’s estimate.

What is the least common type of fingerprint?

The arch is the rarest of the three main types at around 5% of prints. Mixed or accidental patterns are also uncommon.

How many types of fingerprints are there?

Most experts follow the FBI’s Galton Henry system of three main groups and eight pattern types. Purkinje’s early 1823 scheme had nine patterns. Some guides count four types because they list composite or accidental patterns on their own.

Can your fingerprint type change?

No. The ridge pattern is set before birth and stays for life. Injuries and some skin diseases can damage it without turning a loop into a whorl.

Do fingerprint types matter for phone scanners?

Not much. Scanners match fine ridge details rather than the overall type. Our face recognition vs fingerprint comparison shows how fingerprints stack up against faces.

So, which pattern did you find?

Fingerprints are just one of many types of biometrics. They’re also the one you can study at your kitchen table. A pencil and tape and two minutes are all it takes.

Try the test on all ten fingers. Do your hands match each other? Do you share a pattern with a parent or a sibling?

How comfortable are you with companies storing a pattern you can never change? Our look at the advantages and disadvantages of biometrics can help you decide.

Sources

1. U.S. Department of Justice, FBI: The Science of Fingerprints: Classification and Uses
2. National Institute of Justice: The Fingerprint Sourcebook, Chapter 3: Embryology and Morphology of Friction Ridge Skin
3. Shrestha and Malla, JNMA (2019): Study of Fingerprint Patterns in Population of a Community
4. Glover et al., Cell (2023): The developmental basis of fingerprint pattern formation and variation
5. Liu and Srihari: A Computational Discriminability Analysis on Twin Fingerprints
6. ScienceDaily, on the American Journal of Human Genetics study: Gene mutation behind missing fingerprints
7. Venurkar et al., Cureus (2022): Decoding Human Personality Through Dermatoglyphics
8. Indian Psychiatric Society: Position Statement on Dermatoglyphics Multiple Intelligence Test
9. L. S. Penrose, British Medical Journal (1968): Medical Significance of Finger-prints and Related Phenomena
10. Encyclopaedia Britannica: Fingerprint