Grams to Teaspoons Converter

Article — Grams to Teaspoons Converter

Grams to teaspoons — the conversion that depends on what you are measuring

One US teaspoon equals 4.929 mL of volume, but its weight in grams depends entirely on what you put in it. 1 tsp of granulated sugar weighs 4.2 g, 1 tsp of table salt weighs 6.0 g, and 1 tsp of dried basil weighs only 0.7 g. The factor that links volume to mass is density, and household ingredients vary in density by a factor of nine.

That single sentence is the answer to most grams-to-teaspoon questions on the internet. The calculator above stores the per-teaspoon weight of 16 common ingredients sourced from the USDA FoodData Central database and the King Arthur Baking ingredient weight chart, and switches between them with a dropdown menu.

Why density makes one answer impossible

A teaspoon is a measure of volume. A gram is a measure of mass. They cannot be converted directly. The bridge is density — the mass per unit volume, usually quoted in grams per millilitre. Water defines the reference at exactly 1 g/mL. Almost everything else differs.

The denser the substance, the more mass it crams into the same teaspoon. Fine table salt is 1.22 g/mL, so a US teaspoon (4.929 mL) of salt weighs 6.0 g. Honey is denser still at 1.42 g/mL, giving 7.0 g per teaspoon. At the other end, dried basil is mostly air, with a packed density near 0.14 g/mL — a full teaspoon of it weighs less than a gram.

Teaspoon sizes around the world

There are two teaspoons in common use. The US teaspoon, defined in 21 CFR 101.9 as exactly 4.929 mL, is one third of a US tablespoon and one sixth of a US fluid ounce. The metric teaspoon used in most of the world is exactly 5 mL. The difference is 0.071 mL, a 1.4% gap that is too small to matter in any kitchen.

Australian recipes follow the metric teaspoon. UK recipes mix both definitions, with older texts using the imperial teaspoon of 5.92 mL but modern recipes adopting the metric 5 mL. For practical cooking, treat every teaspoon as roughly 5 mL and the gram weight you get from this calculator will be within rounding error of the true value.

Common ingredient weights, in one place

Most of the time when someone searches "grams to teaspoons", they mean one of seven ingredients: sugar, salt, flour, baking powder, butter, honey, or oil. These are the small additions that recipes write as "1 tsp" rather than weighing. Knowing their per-teaspoon mass also lets you convert health labels — like the sugar content of a soda — into spoon-sized intuition.

• Granulated sugar = 4.2 g per US tsp (USDA)
• Brown sugar, packed = 4.6 g per tsp
• Powdered sugar = 2.5 g per tsp
• Table salt, fine = 6.0 g per tsp
• Kosher salt (Diamond Crystal) = 3.2 g per tsp — almost half the density of table salt
• All-purpose flour = 2.6 g per tsp (spooned, levelled)
• Baking powder = 4.6 g per tsp
• Baking soda = 4.6 g per tsp
• Honey = 7.0 g per tsp
• Vegetable oil = 4.5 g per tsp
• Butter = 4.7 g per tsp
• Active dry yeast = 3.1 g per tsp (so a 7 g packet = ~2 1/4 tsp)

Sugar, salt and the WHO daily limits

The teaspoon is the unit that public health campaigns reach for when they want people to feel the numbers on a nutrition label. The WHO 2015 sugar guideline recommends a maximum of 25 g of added sugar per adult per day for additional health benefits. That works out to roughly 6 level teaspoons, and the "6 teaspoons" phrasing is now standard in sugar-reduction campaigns from Public Health England to the Australian Heart Foundation.

The same logic applies to salt. The WHO recommends under 5 g of salt per day, which is 0.83 teaspoons of fine table salt — less than a full level teaspoon. The CDC reports the average American eats roughly 8.5 g of salt a day, about 1.42 teaspoons, well over the limit.

This is why a 355 mL can of cola, which contains 39 g of sugar on the label, is described in health campaigns as containing "9 teaspoons of sugar". Most adults can mentally picture nine teaspoons. Few can mentally weigh 39 g.

Flour and spices — the lightest part of the spice rack

Flour, ground spices and dried herbs are all low-density powders that pack a lot of air between particles. Their per-teaspoon weight clusters between 1 g and 3 g, depending on grind and humidity. Dried leafy herbs are lighter still, because crumbled leaves trap even more air. Dried basil, the lightest common kitchen ingredient, holds only 0.7 g per teaspoon — eight times less than salt of the same volume.

One consequence is that swapping one spice for another by volume rarely produces equal mass. A teaspoon of paprika weighs 2.3 g. A teaspoon of ground ginger weighs 1.8 g. The same recipe quantity by spoon is 28% less by weight, which can show up as a noticeably duller flavour in a dish that depends on the spice.

Why bakers prefer grams

Volume measurements in baking carry a hidden error. One cup of flour, depending on whether you spoon it gently or scoop straight from the bag, can weigh anywhere from 110 g to 150 g — a 36% spread. Scaled down, the same problem shows up in teaspoons: a heaped teaspoon of baking powder can hold double the powder of a level one. For a 1-tsp recipe call, that is the difference between a flat cake and one that overflows the tin.

King Arthur Baking, the oldest US flour milling company (founded in 1790), calls weighing "the single most impactful thing you can do to improve your baking". Professional bakeries use weights for every ingredient, including salt and yeast, because production volumes magnify volume errors. A home cook using teaspoons gets within 10-15% of the right weight on average — enough for soups, sauces and rough recipes, but not for bread fermentation or pastry crusts that rely on tight ratios.

A 4-6-2.5 mental math rule

For mental approximations, three numbers cover most of the kitchen.

Divide grams by the matching number. 12 g of sugar divided by 4 is 3 teaspoons. 15 g of salt divided by 6 is 2.5 teaspoons. 7 g of dry yeast (a single packet) divided by 3 (close to its 3.1 g/tsp) is about 2.3 teaspoons, the figure you will see in bread recipes as "2 1/4 tsp". The rule gets you within roughly 15% of the right answer for any common ingredient.

Common mistakes

A second common error is the assumption that "1 tsp = 5 g" applies to every ingredient. It is true for water, almost true for milk, and roughly true for sugar (within 16%). For flour it is wildly off — flour is 2.6 g/tsp, half the assumed weight. For dried herbs it is off by a factor of five or more. Whenever a number really matters — for medication, salt-restricted diets, or baking — use a per-ingredient figure or a scale.