How Many Grams in a Teaspoon? Complete Conversion Guide

Measuring a teaspoon seems simple enough, but anyone who’s tried baking with a recipe that lists grams knows the feeling of staring at a measuring spoon and wondering exactly how much it holds — and the answer depends entirely on what you’re scooping and even which country you’re measuring in. This guide breaks down the precise gram weights for a teaspoon of common ingredients, explains why the generic “5 grams per teaspoon” rule often fails, and gives you a step-by-step method to convert any ingredient accurately.

Water in 1 tsp: 5 g · Granulated sugar: 4.2 g · Salt: 5.9 g · Butter: 4.7 g · Honey: 7 g · Baking powder: 4.6 g

The following table captures the essential conversion benchmarks.

How many grams are in 1 teaspoon?

A US teaspoon holds exactly 4.93 milliliters, as defined by the Inch Calculator conversion tool. To find the weight in grams, you multiply that volume by the density of the ingredient in grams per milliliter. For water, with a density of 1 g/mL, the math gives you 5 grams per teaspoon. But for granulated sugar (density 0.85 g/mL), the same spoon carries only 4.2 grams.

The implication: a single teaspoon can hold anywhere from 2.5 grams (flour) to 7 grams (honey) depending on the ingredient. The “one teaspoon equals five grams” shortcut works only for water and liquids of similar density.

The standard teaspoon measurement and its volume

• US legal teaspoon: 4.93 mL (GigaCalculator, conversion tool)
• UK teaspoon: 5.9 mL (Recipes and Places, cooking blog)

Neither volume is “wrong,” but the 20% difference between the US and UK standards means a recipe written in one system can yield dramatically different results when measured with the other.

Why weight varies by ingredient

• Density = mass per unit volume. Denser ingredients (honey: 1.4 g/mL) pack more mass into the same 4.93 mL spoon than less dense ones (flour: 0.53 g/mL).
• For example, 1 teaspoon of baking powder weighs about 4.6 grams (The Calculator Site, cooking conversion resource), while all-purpose flour weighs only about 2.6 grams per teaspoon (Delight Baking, conversion chart).

The implication: precise density knowledge is essential for baking success; a small error at the teaspoon level compounds with each additional spoonful.

How many grams is a teaspoon UK?

The UK teaspoon is larger than the US version, holding 5.9 mL versus 4.93 mL. This 0.97 mL difference — about 20% more volume — has a real effect on gram conversions, especially for dense ingredients. Here’s how common ingredients compare under the UK teaspoon standard.

UK vs US teaspoon sizes

• UK teaspoon: 5.9 mL (Recipes and Places)
• US teaspoon: 4.93 mL (Inch Calculator)

Imperial vs metric conversions

If you’re using a UK teaspoon, multiply the density by 5.9 instead of 4.93. For granulated sugar: 0.85 × 5.9 = 5.0 g. For salt (density 1.217 g/mL): 1.217 × 5.9 = 7.2 g. The UK teaspoon yields roughly 20% more grams across the board.

The catch: most modern UK recipes now use metric weights rather than volume measures, but older cookbooks and some imported recipes still rely on the imperial teaspoon.

Is 1 teaspoon the same as 5 grams?

Only when measuring water. The statement “1 teaspoon = 5 grams” is a convenient shortcut that works for water and liquids with similar density, but fails for virtually every other ingredient. Understanding why helps you avoid measurement errors.

The water equivalence rule

Water has a density of exactly 1 g/mL, so 4.93 mL of water weighs 4.93 grams — rounded to 5 grams for most kitchen purposes. The Study.com educational platform explains this clearly: “1 teaspoon = 5 mL, and with water, 5 mL weighs 5 grams.”

When 1 tsp equals 5g (and when it doesn’t)

• Does equal 5g: water, milk (density ~1.03 g/mL), most fruit juices
• Does not equal 5g: sugar (4.2 g), salt (5.9 g), honey (7 g), flour (2.6 g), baking powder (4.6 g), yeast (3 g)

The trade-off: the 5 g rule is easy to remember but leads to significant inaccuracy. For salt, you’d underestimate by 18%; for honey, you’d overestimate by 40%.

The catch: without ingredient-specific conversions, even a simple recipe can go wrong; density is the lever that tips the scale.

How many grams are in a teaspoon of powder?

Powders vary widely in density because of particle size and how they settle. A spoonful of baking powder will weigh different than a spoonful of cocoa powder. Here are the precise values for common kitchen powders.

Baking powder, baking soda, and other powders

• Baking powder: 1 tsp = ~4.6 g (10 g = 2.25 tsp per The Calculator Site)
• Baking soda: 1 tsp = ~4.8 g (Omni Calculator)
• All-purpose flour: 1 tsp = ~2.6 g (Delight Baking)
• Cocoa powder: 1 tsp = ~2.5 g (Recipes and Places)

How to measure powder accurately

For the most consistent results, use the “spoon and level” method: spoon the powder into the measuring spoon without compacting, then level off with a straight edge. Avoid dipping the spoon directly into the powder, which can compress it and increase the actual weight by 20–30%.

The pattern: fine powders like flour and cocoa are the lightest; granular powders like baking soda are heavier. Always check a conversion chart for the specific powder in your recipe.

How many grams in a teaspoon of sugar?

Sugar is one of the most commonly measured ingredients by teaspoon — especially when checking nutrition labels for added sugars. Different types of sugar have different densities, so one teaspoon is not the same weight for all.

Granulated sugar, brown sugar, powdered sugar

• Granulated sugar: 1 tsp = 4.2 g (Omni Calculator)
• Brown sugar (packed): 1 tsp = 4.8 g (Recipes and Places)
• Powdered sugar: 1 tsp = 2.6 g (Delight Baking)

The implication: when a nutrition label says a serving contains 12 grams of added sugar, that equals about 2.9 teaspoons of granulated sugar — not the 2.4 teaspoons you’d get if you used the 5 g rule.

Converting sugar grams to teaspoons for diet

To convert grams of sugar to teaspoons, divide the gram amount by 4.2 (the density of granulated sugar). For example, 12 g ÷ 4.2 = 2.86 teaspoons. The The Calculator Site uses this factor: “Granulated sugar: 1 gram = 0.24 tsp (US level teaspoon)”.

The catch: brown sugar and powdered sugar require different divisors. Use 4.8 for packed brown sugar and 2.6 for powdered sugar. Always check the ingredient type on the label before converting.

What this means: a one-size-fits-all conversion leads to either under- or over-consuming sugar; the density of your specific sugar type is the only reliable guide.

How to convert grams of sugar into teaspoons?

Converting grams to teaspoons is a straightforward division — as long as you use the correct density factor. For granulated sugar, the standard factor is 4.2 grams per teaspoon.

Simple division formula

• Teaspoons = grams ÷ (density factor in g/tsp)
• For granulated sugar: teaspoons = grams ÷ 4.2
• For salt: teaspoons = grams ÷ 5.9
• For water: teaspoons = grams ÷ 5.0

Example: 15 grams of granulated sugar ÷ 4.2 = 3.57 teaspoons.

Using the 4.2g standard

The 4.2 g per teaspoon factor is the most widely cited by conversion resources, including Omni Calculator and The Calculator Site. It’s built into most online converters and nutrition label calculators.

What this means: if you see “4 grams per teaspoon” on a package, that’s a rounded version. The precise figure for granulated sugar is 4.2 g, which matters when scaling recipes or tracking daily sugar intake accurately.

The catch: using a rounded 4g factor instead of 4.2g leads to a 5% error; for a 50g sugar recipe that means a difference of about one teaspoon.

Seven common ingredients, one clear pattern: density drives the weight per teaspoon more than volume.

The pattern: ingredients with densities below 1 g/mL (sugar, flour) yield fewer grams per teaspoon than water; denser ingredients (salt, honey) yield more. Butter falls close to water because its density is near 1 g/mL.

How to convert grams to teaspoons step by step

1. Identify the ingredient and look up its density in g/mL from a reliable source (e.g., Inch Calculator’s ingredient density table).
2. Use the formula: grams per teaspoon = density (g/mL) × 4.93 (US teaspoon volume in mL).
3. Divide the weight you want to convert by the grams-per-teaspoon figure. For example, 10 g of sugar ÷ 4.2 g/tsp = 2.38 tsp.
4. Round to the nearest ¼ teaspoon for practical kitchen measuring, but keep the exact figure if you’re using a digital scale.

For recipes from the UK, substitute 5.9 mL for the teaspoon volume. GigaCalculator provides an interactive converter that handles both standards.

What we know and what remains uncertain

The pattern: while the core measurements are well established, real‑world variables like scooping technique, packing, and brand differences mean that any conversion should be treated as a starting point, not an absolute.

“One level teaspoon of granulated sugar weighs 4.2 grams.”

The Calculator Site (cooking conversion resource)

“1 teaspoon = 5 mL, and with water, 5 mL weighs 5 grams.”

Study.com (educational platform)

The simple “5 grams per teaspoon” rule is a useful starting point, but it’s wrong for most ingredients. For home bakers following a recipe that specifies grams, the only reliable approach is to use ingredient-specific densities — especially for flour, sugar, and salt. For diet-trackers, knowing that a teaspoon of granulated sugar weighs 4.2 grams (not 5) can mean the difference between consuming 25% more sugar than you intended. The choice is clear: invest in a digital kitchen scale, or learn the densities that matter for your most-cooked dishes.