One-third of a teaspoon is roughly 1.6 milliliters, a tiny amount you can approximate several ways without a dedicated measuring spoon. The easiest method is using your fingers: a generous pinch between your thumb and first two fingers gets you close. But there are more precise options depending on what you have in your kitchen.
Use a Kitchen Scale for the Best Accuracy
If you own a digital kitchen scale that reads in grams, weighing is more accurate than any visual trick. One-third of a teaspoon weighs different amounts depending on the ingredient, because density varies. Here are common weights for 1/3 teaspoon:
- Salt: 2.0 g
- Baking powder: 1.6 g
- White sugar: 1.4 g
- Brown sugar: 1.5 g
- Flour: 0.9 g
- Cocoa powder: 0.9 g
- Cornstarch: 0.8 g
- Honey: 2.3 g
- Olive oil: 1.5 g
Most kitchen scales can read down to 1 gram, which makes this practical for denser ingredients like salt or sugar. For lighter powders like flour at 0.9 g, you’re pushing the limits of a standard scale, so rounding to 1 gram is reasonable.
The Finger Pinch Method
A single pinch, taken between your thumb and forefinger, equals roughly 1/8 of a teaspoon. To get to 1/3 teaspoon, you need about two and a half to three pinches. A quicker approach: use your thumb plus your index and middle fingers together to grab a larger pinch. Two of those generous three-finger pinches will land you in the right range.
This works best with granular ingredients like salt, sugar, or dried spices. It’s less reliable with fine powders like baking soda, which compact differently depending on how firmly you pinch.
The Thumb Tip Guide
Your thumb is a surprisingly useful measuring tool. The tip of your thumb, from the last knuckle to the end, holds roughly one full teaspoon of a dry ingredient when you scoop with it. To approximate 1/3 teaspoon, fill just the pad of your thumb tip, about one-third of the way from the nail to the knuckle. It’s imprecise, but for seasoning and spices where a small margin of error is fine, it works well enough.
Divide a Larger Spoon
If you have a 1/2 teaspoon measure but not a 1/3, fill the half teaspoon and then remove roughly a third of what’s in it. You’re aiming to keep about two-thirds of the scoop. For dry ingredients, use the tip of a butter knife to push away a small portion from one side. This gets you to approximately 1/3 teaspoon.
If you only have a full teaspoon measure, fill it level and then divide the contents into three equal piles on a cutting board or plate. Each pile is 1/3 teaspoon. This visual division method is easiest with coarse ingredients like kosher salt or granulated sugar, where you can clearly see three distinct portions.
Use a Regular Silverware Spoon
A standard teaspoon from your silverware drawer holds close to 5 ml, nearly identical to a calibrated measuring teaspoon at 4.93 ml. The difference is negligible. So if you fill a regular small spoon about one-third of the way, that gets you in the right neighborhood. The challenge is eyeballing one-third of a rounded spoon bowl. Focus on covering just the deepest center portion, leaving the outer edges of the spoon empty.
Everyday Object Comparisons
For dry ingredients, 1/3 teaspoon is a very small volume. Picture three standard chocolate chips sitting side by side. That cluster is roughly 1/3 teaspoon. Another way to visualize it: a 1/3 teaspoon mound of salt or sugar on a flat surface is about the size of a pencil eraser, maybe slightly larger.
Many spice jars come with small built-in shaker holes or scoops. If your jar has a flip-top with a pour side and a spoon side, the spoon opening often holds between 1/4 and 1/2 teaspoon. Knowing which size your jar’s opening fits can help you calibrate by eye over time.
For Liquids, Count Drops
A standard teaspoon holds about 5 ml. One-third of a teaspoon is roughly 1.6 ml. A typical dropper or the natural drip from a bottle produces drops of about 0.05 ml each, meaning 1/3 teaspoon equals approximately 30 to 33 drops. This is most useful for liquid extracts like vanilla, where you can count drops from the bottle. For thicker liquids like honey or oil, drops are larger and less consistent, so weighing on a scale is a better option.
When Precision Matters and When It Doesn’t
For most cooking, especially seasoning with salt and spices, a rough estimate is perfectly fine. You’re tasting as you go and can adjust. The finger pinch or visual division method will serve you well here. Baking is where precision starts to matter more, particularly with leavening agents like baking powder and baking soda, where small differences change how your dough rises. If you’re baking and don’t have the right measuring spoon, a kitchen scale is your best backup. Even an inexpensive scale reading to 1 gram will get you closer than any visual trick for these ingredients.