Fart Calculator
Ever wondered how many times a day you fart, how much gas you produce, or how much you have released in your whole life? This flatulence & gas estimator uses your diet and age to work it out — and shows whether you land in the normal 10–20 farts per day range.
How the fart calculator works
Everyone passes gas — it is a normal, healthy part of digestion. Gas builds up in your gut from two places: air you swallow while eating and drinking, and (mostly) the way friendly bacteria in your large intestine ferment the food you can't fully digest. Around three-quarters of your flatulence is made by those gut bacteria, which is why what you eat has such a big effect.
This calculator starts from a typical baseline and adds an estimate for each well-known gas-producing food in your diet — beans and lentils, cruciferous vegetables, dairy, fibre and fizzy drinks — then scales it up by your age to reveal your lifetime totals:
Farts per day = baseline + your gas-food servings, each weighted by how much gas it typically produces
Daily gas volume ≈ farts per day × ~50 ml per fart
Lifetime farts = farts per day × 365 × your age
It is a light-hearted, educational estimate — not a medical measurement — but every number is anchored to real published averages.
A worked example
Take a 30-year-old who eats beans 3 times a week, cruciferous veg 4 times a week, 2 servings of dairy a day, 3 fibre servings a day and 1 fizzy drink a day. The calculator lands them at about 13 farts per day — squarely in the normal 10–20 range — producing roughly 660 ml of gas a day. Over 30 years that adds up to around 144,000 lifetime farts and about 7,200 litres of gas — enough to fill well over a thousand party balloons. Change any input to see how your own diet moves the numbers.
What is a normal amount of gas?
The medical consensus is remarkably consistent: most people fall in the ranges below. Passing gas a bit more or less than this is usually still perfectly healthy.
| Measure | Typical average | Normal range |
|---|---|---|
| Farts per day | ~14 times | 10–20 times |
| Gas volume per day | ~750 ml | 500–1,500 ml |
| Gas made by gut bacteria | ~75% | rest is swallowed air |
Foods that make you fart the most
If your number came out high, these usual suspects are probably why — they contain carbohydrates and fibres your small intestine can't fully absorb, so they reach the gut bacteria that turn them into gas.
| Food group | Examples |
|---|---|
| Beans & pulses | Baked beans, lentils, chickpeas, soya beans |
| Cruciferous veg | Broccoli, cabbage, cauliflower, Brussels sprouts |
| Dairy | Milk, cheese, ice cream (more so if lactose intolerant) |
| Whole grains & fibre | Wheat, bran, oats, high-fibre cereals |
| Other | Onions, garlic, fizzy drinks, sorbitol sweeteners |
Educational estimate only — not medical advice. See a doctor if excessive gas comes with pain, bloating that won't settle, blood in the stool or unexplained weight loss.
Frequently asked questions
How many times a day is it normal to fart?
Most adults fart about 14 times a day, and roughly 10–20 times is normal (some sources say 5–25). More or less can still be healthy — diet is the biggest factor.
How does the fart calculator estimate my daily total?
It starts from a baseline and adds an estimate for each gas-producing food — beans, cruciferous veg, dairy, fibre and fizzy drinks — since gut bacteria ferment these into extra gas. It's an educational estimate, not a measurement.
How much gas does the average person produce per day?
About 500–1,500 ml a day (roughly ½ to 1½ litres), averaging near 750 ml. Around 75% is made by bacteria in the large intestine.
Which foods make you fart the most?
Beans and pulses, dairy (especially with lactose intolerance), broccoli, cabbage and cauliflower, onions and garlic, wheat and gluten, high-fibre foods, fizzy drinks and artificial sweeteners.
When is excessive gas a sign of a problem?
See a doctor if it comes with blood in the stool, unexplained weight loss, severe abdominal pain, a sudden change in bowel habits, or bloating that won't settle — these can indicate IBS, lactose intolerance or coeliac disease.
Can you fart in your sleep?
Yes — the anal sphincter relaxes during sleep, so passing gas overnight is common and normal. Most people just aren't aware of it.
Is this fart calculator medically accurate?
It uses real published averages for fart frequency and gas volume, but everyone's gut is different, so treat the result as a fun, educational estimate rather than a diagnosis. For ongoing or worrying symptoms, speak to a doctor.