Convert tbsp to ml US tablespoons ↔ millilitres Free Online Secure

Spoon or syringe: why a tablespoon on a label becomes millilitres

Old cough bottles say "one tablespoon three times a day", but pharmacists and paediatricians now prefer millilitres, because spoons in a kitchen drawer vary widely. To convert tbsp to ml you multiply by 14.787: one tablespoon is 14.8 ml, 2 tablespoons 29.6 ml, half a tablespoon 7.4 ml. Medical labelling rounds the tablespoon to 15 ml and the teaspoon to 5. This page multiplies as you type, and the text below explains the safe way to read spoon measures on products, with a clear warning not to measure doses with cutlery.

The page covers the rule with examples, a note on each unit, a comparison, a tour of dosing devices and the slips to avoid. All arithmetic happens in your browser; nothing you enter is sent anywhere. This page is not medical advice: follow the label, the device supplied and the instructions of a clinician or pharmacist.

How to convert tbsp to ml: multiply by 14.787

The rule

One US tablespoon is exactly 14.78676478125 millilitres. To convert tbsp to ml, multiply the tablespoons by 14.787, or by 15 for a medical label, which rounds it. So 1 tbsp is 14.8 ml, 2 tbsp 29.6 ml, 4 tbsp 59.1 ml, 8 tbsp 118.3 ml and 16 tbsp 236.6 ml. In the other direction, divide millilitres by 14.787.

Worked examples

A product that says "2 tablespoons" means 30 ml on a pharmacy scale, or 29.6 by the exact figure. A bottle that says "1 tablespoon, 15 ml" is following the rounded standard. A dosing cup with a line at 30 ml marks two tablespoons, one fluid ounce.

Why a kitchen spoon will not do

Spoons from a cutlery set can hold from 3 to 7 millilitres when a teaspoon is meant, and 10 to 20 when a tablespoon is. A dose measured with them may be half or double what was intended. That is why labels give millilitres and supply a cup or a syringe.

A quick sanity check

The millilitre is the smaller unit, so the number grows by about fifteen times. If your “convert tbsp to ml” calculation result grew only three or five times, you used the teaspoon or ounce factor.

The tablespoon

Three teaspoons

The US tablespoon is 14.79 millilitres, half a fluid ounce. In pharmacy it is rounded to 15 ml. It is a kitchen measure, and the Australian tablespoon, at 20 ml, is a third larger, a trap for anyone reading a label from another country.

Where it appears

Recipes, older medicine labels and measuring spoons.

The millilitre

The unit of doses

The millilitre is the unit used for liquid medicines. Health organisations recommend that labels and dosing devices use millilitres only, so that no spoon is needed. Syringes and cups are marked in it, often with 0.5 or 1 ml steps.

Where it appears

Medicine labels, syringes, dosing cups and droppers.

Tablespoon and millilitre compared

A tablespoon is about fifteen millilitres. On a label, 15 ml is clearer than a tablespoon, because the volume is the same everywhere while spoons are not. The difference between a US tablespoon, 14.8, and the pharmacy's 15 is 1.4 percent, trivial, but the difference between a tablespoon and a teaspoon, a factor of three, is a classic cause of dosing errors.

The factor is not round, so a quick estimate is multiplying by 15 and subtracting 1.4 percent. For exact work, use 14.78676478125.

Where the conversion appears

Reading an old label

An older bottle might say "one tablespoon", which is 15 ml, or "two teaspoons", 10 ml. Do not assume, and read the current label. If the label offers only spoons, use the dosing device supplied or ask a pharmacist. When you convert tbsp to ml for a label, you are only translating the number, not choosing a dose.

Dosing devices

Dosing cups are marked in millilitres and often in teaspoons and tablespoons too: 5 ml, 10 ml, 15 ml, 20 ml, 30 ml. Oral syringes come in 1, 3, 5 and 10 ml sizes, and droppers are marked in 0.5 or 1 ml. A syringe is the most accurate for small volumes, so paediatric products usually come with one.

Kitchen use of the same factor

In cooking the same conversion applies: 4 tablespoons of oil is 59 ml and 8 tablespoons of milk 118 ml. Recipes tolerate small errors, medicines do not, which is why, when you convert tbsp to ml for a recipe, the kitchen spoon belongs to the kitchen and the dosing device to the medicine.

Teaspoon and tablespoon confusion

A tablespoon is three times a teaspoon, 15 ml against 5. A dose of one teaspoon taken as one tablespoon is three times too high. Abbreviations make it worse: tsp and tbsp differ by one letter, and labels sometimes capitalise T for tablespoon and t for teaspoon. This is another reason that health organisations ask for millilitres only.

Countries and their spoons

The US tablespoon is 14.8 ml, the metric tablespoon used in Britain, Canada and New Zealand 15, the Japanese 15 and the Australian 20. The old British tablespoon was 17.7. A recipe from Australia calling for 2 tablespoons means 40 ml, which is 2.7 US tablespoons. Check where the source comes from.

In a spreadsheet

Put tablespoons in column A and use =A2*14.78676478 in column B. For the reverse, =B2/14.78676478. A column with =A2*15 gives the metric figure. Format with one decimal place, and keep the source column so that each number can be traced to the label.

Rounding

The factor is exact, so rounding is your choice. In the kitchen, round to 5 ml. On a pharmacy label, the figure is already rounded to 15 ml, and the dose should be read from the device. Round at the end of a calculation, and do not round a dose down or up by yourself.

A mental shortcut

Multiply tablespoons by 15 and take off 1.4 percent: 4 is 60 less 0.8, 59.2; 8 is 120 less 1.7, 118.3. The ladder 1, 2, 4, 8, 16 tablespoons for 15, 30, 59, 118, 237 ml is the one cooks remember. For medicine, never rely on mental shortcuts, but use the device.

Reference values

1 tbsp is 14.8 ml, 2 is 29.6, 3 is 44.4, 4 is 59.1, 6 is 88.7, 8 is 118.3, 12 is 177.4 and 16 is 236.6 ml. If you convert tbsp to ml and land far from this ladder, repeat the multiplication.

Checking by reversing

To make sure your “convert tbsp to ml” calculation result is right, divide it by 14.787. If 4 tbsp gave 59.1 ml, then 59.1 divided by 14.787 returns 4.0. A second check is the size of the answer: it should be about fifteen times bigger. If it is only three times, you used the teaspoon factor.

Calibrating a spoon at home

You can check any spoon with a kitchen scale. A level tablespoon of water weighs about 14.8 grams, a teaspoon 4.9. Pour water into the spoon on the scale and note the weight, then compare. If a cutlery spoon holds only 10 grams, it is a dessertspoon in practice. For cooking a small error is harmless, but this test shows why the spoon in the drawer is no substitute for a measure, and why you convert tbsp to ml before trusting it.

The dessertspoon and other old measures

The British dessertspoon, 10 ml, is two teaspoons, two thirds of a metric tablespoon. An old recipe that calls for two dessertspoons wants 20 ml, 1.35 US tablespoons. The Australian tablespoon of 20 ml equals a British dessertspoon doubled. Old cookery books mix all of these, so when you meet a spoon, check the era and the country before you convert.

Labels in the United Kingdom

British medicine labels give doses in millilitres, and many products specify a "5 ml spoonful", a standard spoon supplied with the bottle. A 5 ml spoon is a teaspoon, a third of a tablespoon. Spoons supplied in this way are made to the right volume, which is why they should be used in place of cutlery. The label's number in millilitres is the only figure that matters.

Bar spoons and cocktails

A bar spoon holds about 5 millilitres, a teaspoon, and a recipe may call for two bar spoons of syrup, 10 ml. A cocktail with 2 tablespoons of juice, 30 ml, is one ounce. Bartenders use jiggers for precision, and when a home recipe is written in spoons you can convert tbsp to ml to match it to a jigger's markings, such as 15, 30 and 45 millilitres.

Variation in household spoons

Studies of household teaspoons have found volumes between about 2.5 and 7.5 millilitres, and tablespoons between 10 and 20. A dose measured with a random spoon may therefore be off by up to 50 percent. Standard measuring spoons are made to 5 and 15 ml, but even they vary a little. For any dose, use the device supplied with the product.

Craft mixes and household recipes

Craft recipes such as homemade slime, play dough and soap call for tablespoons of liquids: 4 tablespoons of glue, 59 ml, 2 of water, 30 ml. Quantities are small and tolerant of errors. Scaling up for a class of 20 children, 20 times the quantities, gives 1.2 litres of glue, 80 tablespoons. A conversion helps buy the right bottle size.

Teaching measurement

Teachers use spoons to illustrate volume. A class measures 15 ml of water in a tablespoon and pours it into a measuring cylinder, discovering that three teaspoons make one tablespoon and sixteen tablespoons make a cup. The activity connects everyday units with millilitres and shows how a conversion factor of almost 15 emerges from the definitions of the units.

Protein shakes and scoops

A scoop of protein powder is usually 30 grams, about 3 tablespoons by volume, 44 millilitres of powder, but powders differ greatly in density. A shake of one scoop in 300 millilitres of milk, 20 tablespoons, is a typical serving. Scoops supplied in the tub are calibrated for that product, and converting spoons into millilitres is useful only for the liquid you mix.

Spoons in nutrition tables

Nutrition tables give values for a tablespoon of common foods: olive oil 119 kilocalories, honey 64, peanut butter 94. The serving size of 15 ml is a rounded value close to the exact 14.79. If you multiply the tablespoons you eat by 15 you get the millilitres, and the calories by the table. A day's spoons add up, which is why people track them.

Dosing cups and their limits

Dosing cups have lines at 5, 10, 15, 20, 25 and 30 millilitres, 30 being two tablespoons or one fluid ounce. They are accurate to a few millilitres, which is fine for adult doses but not for small children's. A cup should be read on a flat surface at eye level. If a dose is smaller than 5 ml, use a syringe or dropper, not the cup.

Oral syringes

An oral syringe of 5 ml reads in steps of 0.2 or 0.1 ml. A syringe of 10 ml has steps of 0.5 or 0.2. The plunger is read at the edge nearest the tip, and the liquid is drawn up slowly to avoid bubbles. Because syringes are in millilitres, there is no spoon conversion at all, and for a medicine with a tablespoon dose, 15 ml, you would fill the syringe up to the 10 ml line and then again to 5.

Cough syrups and cold remedies

Many syrups come with a cup marked 5, 10 and 15 ml, 1 teaspoon, 2 teaspoons and 1 tablespoon. A bottle of 120 ml holds 8 tablespoons, 24 teaspoons. The age and dose are stated on the pack and must be followed, and some products are not suitable for young children at all. Read the leaflet, and if in doubt, ask.

Supplements and liquid vitamins

Liquid vitamins and supplements specify a serving as a tablespoon, 15 ml, or a teaspoon, 5 ml. A bottle of 473 ml, 32 tablespoons, gives 32 servings of a tablespoon, or 95 of a teaspoon. The label gives the dose per serving, so a conversion helps you see how many servings the bottle holds, but never changes the dose.

Pet medicines and veterinary doses

Veterinary liquids give doses in millilitres per kilogram of body weight, calculated by a vet. A dog of 20 kilograms at 0.5 ml per kilogram would get 10 ml, two teaspoons, but the dose is measured with a syringe. Never convert a veterinary dose into spoons, since concentration and weight vary, and follow the vet's instructions and the syringe supplied.

Cooking with spoons: the same number, a different tolerance

In a recipe, 3 tablespoons of oil, 44 ml, can be 40 or 48 without anyone noticing. In a dose, a 10 percent error matters. The conversion from tablespoons to millilitres is the same, but the tolerance is not. Kitchen measures are for cooks and dosing devices for medicines, and neither should be used for the other.

Recipes and the tablespoon

A pancake recipe takes 2 tablespoons of melted butter, 30 ml, 4 tablespoons of milk, 59 ml, and 1 of sugar. A salad dressing takes 6 of oil and 2 of vinegar, 118 ml in all. When you convert tbsp to ml for a recipe, you can mix by volume in a measuring jug rather than counting spoons, which saves time with larger batches.

More values for convert tbsp to ml

A longer list of conversions

If the value you need is not in the first list, these further conversions may be close enough to read off directly:

• 0.1 tbsp = 1.478676478125 ml
• 0.5 tbsp = 7.393382390625 ml
• 3 tbsp = 44.36029434375 ml
• 4 tbsp = 59.147059125 ml
• 7 tbsp = 103.507 ml
• 15 tbsp = 221.801 ml
• 20 tbsp = 295.735295625 ml
• 75 tbsp = 1,109.01 ml
• 200 tbsp = 2,957.35295625 ml
• 500 tbsp = 7,393.382390625 ml
• 2,000 tbsp = 29,573.5295625 ml
• 10,000 tbsp = 147,867.6478125 ml

Mistakes when you convert tbsp to ml

Using a cutlery spoon

A spoon from the drawer is not a measure. Use measuring spoons for cooking and the supplied device for medicine.

Confusing teaspoons and tablespoons

One tablespoon is three teaspoons. The difference is a factor of three.

Dividing instead of multiplying

The millilitre is the smaller unit, so the number grows. If 4 tbsp became 0.27, you divided.

Short answers

What is 1 tablespoon in millilitres?

14.79 millilitres.

How do I convert tbsp to ml?

Multiply by 14.787.

What is 1 millilitre in tablespoons?

0.0676 tablespoons.

What does 4 tbsp come to in millilitres?

59.1 ml.

Does the page send my figure anywhere?

No, everything happens in your browser.

Related tools and a final note

Other volume converters sit nearby: Convert tbsp to tsp, Convert fl oz to ml, Convert tsp to ml, Convert ml to tsp, Convert km to mi, Convert mi to km, Convert °C to °F, Convert °F to °C, Convert °F to K. To go the other way, use Convert ml to tbsp.

To recap: you convert tbsp to ml by multiplying by 14.787 and you write the unit beside the result. Everything is computed locally, with no account and no upload.