What is the healthiest Bristol stool type?

Types 3 and 4 are the formed middle of the scale and are usually passed without straining or rushing. There is no single healthy type, though: in a Bristol population study only 56% of women's and 61% of men's stools were the middle types.

What does Bristol stool type 1 mean?

Type 1 is separate hard lumps, like nuts, and goes with slow transit: the stool stayed in the colon long enough for most of its water to be absorbed. If it is your usual type, it is worth discussing with a doctor or pharmacist.

Is type 5 stool normal?

Type 5 is soft blobs that still hold a shape. Rome IV does not count it as loose, and a validation study grouped it with types 3 and 4 as the normal band. Type 5 with more frequent stools for over four weeks meets the British definition of chronic diarrhoea.

Is type 6 or type 7 stool diarrhoea?

Rome IV counts types 6 and 7 as loose or watery stools. Diarrhoea as a condition also depends on how often you go and how long it lasts, so one loose stool is not diarrhoea.

Can the Bristol stool chart tell me my transit time?

Only roughly. In the study behind the scale, stool form tracked transit time better than frequency or stool weight, but the correlation was moderate and we could not find a source for the per-type hour ranges many charts print.

Why is my stool type different every day?

Transit time itself varies from day to day with food, activity, sleep and timing. In a Bristol population study, only 56% of women's and 61% of men's stools were the middle types, so variation is normal.

When should I worry about my stool?

See a doctor for blood in your stool, black tarry stool, a change in bowel habit that has lasted, symptoms that wake you at night, or unplanned weight loss, whatever the Bristol type. Black tarry stool or heavy bleeding needs medical advice the same day.

Bristol Stool Chart Checker: What Your Type Means

Find your Bristol stool type and what it says about your gut.

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About 2 minutes
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Updated October 3, 2026

The short answer

The Bristol Stool Chart rates stool from type 1 (separate hard lumps) to type 7 (entirely liquid). Types 1 and 2 are hard and go with slower transit, types 3 and 4 are the formed middle of the scale, type 5 is soft, and types 6 and 7 are loose and go with faster transit. One stool means little: the pattern over about two weeks matters, and blood, black stool or a lasting change need a doctor whatever the type.

Which Bristol type is your stool?Pick the closest match. If you are between two types, choose one rule and use it every time.

How often has this been your type recently?

Is this a change from what is normal for you?

Do any of these apply?Optional. Tick any that apply now or recently.

Blood in or on my stool, or on the toilet paperBlack, sticky, tarry stoolIron tablets and bismuth stomach remedies can also darken stool, but do not assume that is the cause.Waking at night to open my bowelsLosing weight without trying

How to use the Bristol Stool Chart Checker

1Pick the Bristol type that best matches your stool, from 1 (hard lumps) to 7 (liquid).
2Say how often this has been your type recently and whether it is a change from your normal.
3Tick any warning signs such as blood, black stool, waking at night or weight loss.
4See what the type says about transit, whether your pattern is worth raising, and when to see a doctor.

The seven Bristol stool types

Ken Heaton's group in Bristol showed that stool form tracks how fast material moves through the gut. In 66 volunteers whose transit was measured with marker pellets, then sped up with senna and slowed with loperamide, stool form correlated with transit time better than stool frequency or weight did. Harder types mean slower transit; looser types mean faster.

The correlation is real but moderate, so the scale is a guide, not a stopwatch. Many charts print an hour range next to each type; we could not find a source for those figures and do not use them.

Type	What it looks like	What it suggests
1	Separate hard lumps, like nuts	Slow transit; hard to pass
2	Sausage-shaped but lumpy	Slow transit
3	Like a sausage with cracks on the surface	Middle of the scale
4	Like a sausage or snake, smooth and soft	Middle of the scale
5	Soft blobs with clear-cut edges	Soft; borderline
6	Fluffy pieces with ragged edges, mushy	Faster transit
7	Watery, no solid pieces	Fastest transit

What counts as normal

There is no single normal type. In a study of nearly 1,900 adults in East Bristol, the middle types made up only 56% of women's stools and 61% of men's. In a US national survey, 90% of men who described their bowel habit as normal said their usual type was 3 to 5, while for women the range was wider, 2 to 6.

The lines that matter clinically are at the edges. Rome IV, used to diagnose and subtype IBS, counts types 1 and 2 as hard and types 6 and 7 as loose. The British Society of Gastroenterology defines chronic diarrhoea as stools of type 5 to 7 with increased frequency for more than four weeks. Our guide on why poop is different every day explains the day-to-day swings.

Types	How guidelines use them	Source
1 to 2	Hard or lumpy stools	Rome IV
3 to 5	Normal water content band in a validation study	Blake 2016
6 to 7	Loose or watery stools	Rome IV
5 to 7 with more frequent stools for over 4 weeks	Chronic diarrhoea	BSG 2018

When the type matters less than what comes with it

Blood, black tarry stool, a change in bowel habit that has lasted, symptoms that wake you at night and unplanned weight loss all need a doctor whatever the stool type. In the UK, NICE now offers a home stool test (FIT) to adults of any age with a change in bowel habit. The gut red flags checker takes you through these.

If you have inflammatory bowel disease, stool type is one useful line in a diary alongside the number of stools, blood and urgency. Our guides to Bristol type 6 and Bristol type 7 go deeper on loose and watery stool, and the bowel movement frequency checker looks at how often you go.

Frequently asked questions

What is the healthiest Bristol stool type?: Types 3 and 4 are the formed middle of the scale and are usually passed without straining or rushing. There is no single healthy type, though: in a Bristol population study only 56% of women's and 61% of men's stools were the middle types.
What does Bristol stool type 1 mean?: Type 1 is separate hard lumps, like nuts, and goes with slow transit: the stool stayed in the colon long enough for most of its water to be absorbed. If it is your usual type, it is worth discussing with a doctor or pharmacist.
Is type 5 stool normal?: Type 5 is soft blobs that still hold a shape. Rome IV does not count it as loose, and a validation study grouped it with types 3 and 4 as the normal band. Type 5 with more frequent stools for over four weeks meets the British definition of chronic diarrhoea.
Is type 6 or type 7 stool diarrhoea?: Rome IV counts types 6 and 7 as loose or watery stools. Diarrhoea as a condition also depends on how often you go and how long it lasts, so one loose stool is not diarrhoea.
Can the Bristol stool chart tell me my transit time?: Only roughly. In the study behind the scale, stool form tracked transit time better than frequency or stool weight, but the correlation was moderate and we could not find a source for the per-type hour ranges many charts print.
Why is my stool type different every day?: Transit time itself varies from day to day with food, activity, sleep and timing. In a Bristol population study, only 56% of women's and 61% of men's stools were the middle types, so variation is normal.
When should I worry about my stool?: See a doctor for blood in your stool, black tarry stool, a change in bowel habit that has lasted, symptoms that wake you at night, or unplanned weight loss, whatever the Bristol type. Black tarry stool or heavy bleeding needs medical advice the same day.

Why Is My Poop Different Every Day?
Stool that changes day to day is normal, even in people with no gut condition. What drives the swings, how much is noise, and what counts as a real change.
Bristol Stool Type 6: What It Actually Means
Type 6 is mushy stool with ragged edges, meaning your colon passed it along before it finished reabsorbing water. What that does and does not tell you.
Bristol Stool Type 7: What Watery Stool Means
Type 7 is entirely liquid stool with no solid pieces. What it means, how many days is worth a call, dehydration, stool tests, and the causes worth ruling out.
Difference Between IBS-D and IBS-C Explained
IBS-D and IBS-C are separated by one rule: what share of your abnormal stools are loose versus hard. Here is how the rule works and why the label keeps moving.
How Much Blood in Stool Is Normal With UC?
In ulcerative colitis the target is no visible blood at all. Why the eye misjudges amount, what each bleeding pattern suggests, and when to call your team.

Sources

Lewis SJ, Heaton KW. Stool form scale as a useful guide to intestinal transit time. Scand J Gastroenterol. 1997;32(9):920-4. doi:10.3109/00365529709011203
Heaton KW, Radvan J, Cripps H, Mountford RA, Braddon FE, Hughes AO. Defecation frequency and timing, and stool form in the general population: a prospective study. Gut. 1992;33(6):818-24. doi:10.1136/gut.33.6.818
Blake MR, Raker JM, Whelan K. Validity and reliability of the Bristol Stool Form Scale in healthy adults and patients with diarrhoea-predominant irritable bowel syndrome. Aliment Pharmacol Ther. 2016;44(7):693-703. doi:10.1111/apt.13746
Mitsuhashi S, Ballou S, Jiang ZG, Hirsch W, Nee J, Iturrino J, et al. Characterizing normal bowel frequency and consistency in a representative sample of adults in the United States (NHANES). Am J Gastroenterol. 2018;113(1):115-23. doi:10.1038/ajg.2017.213
Mearin F, Lacy BE, Chang L, Chey WD, Lembo AJ, Simren M, et al. Bowel disorders. Gastroenterology. 2016;150(6):1393-407.e5. doi:10.1053/j.gastro.2016.02.031
Arasaradnam RP, Brown S, Forbes A, Fox MR, Hungin P, Kelman L, et al. Guidelines for the investigation of chronic diarrhoea in adults: British Society of Gastroenterology, 3rd edition. Gut. 2018;67(8):1380-99. doi:10.1136/gutjnl-2017-315909
Chumpitazi BP, Self MM, Czyzewski DI, Cejka S, Swank PR, Shulman RJ. Bristol Stool Form Scale reliability and agreement decreases when determining Rome III stool form designations. Neurogastroenterol Motil. 2016;28(3):443-8. doi:10.1111/nmo.12738
National Institute for Health and Care Excellence. Suspected cancer: recognition and referral. NICE guideline NG12. https://www.nice.org.uk/guidance/ng12

Cite this tool

Clairop. Bristol Stool Chart Checker. www.clairop.com/tools/bristol-stool-chart-checker. Updated October 3, 2026.

Clairop is a general wellness app for people living with a diagnosed digestive condition. It does not replace professional medical care, diagnosis, or treatment. Always follow your healthcare provider's advice.

Clairop logs meals, symptoms and stool in seconds, then looks for the foods your gut reacts to, including reactions that land days later.

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