How Much Is 3/8Th Of a Cup? | Measure It Without Guessing

Three-eighths of a cup equals 6 tablespoons (18 teaspoons), sitting just under 1/2 cup.

You’ll see 3/8 cup show up in muffin batters, sauces, pancake mixes, and plenty of “half-batch” recipes. It’s one of those fractions that’s easy to overthink, mostly because many measuring cup sets skip it.

The good news: 3/8 cup is simple once you tie it to spoons, a standard 1/4 cup, or the milliliter marks on a liquid measuring cup. This page gives you a few clean ways to hit the same volume on purpose, so your recipe stays steady from one cook to the next.

How Much Is 3/8Th Of a Cup?

In plain kitchen terms, 3/8 cup is three parts out of eight equal parts of one cup. If you’ve got a 1/2 cup measure in your hand, 3/8 cup is one tablespoon pair (2 tablespoons) less than that 1/2 cup.

If you’ve got a 1/4 cup measure, 3/8 cup is that 1/4 cup plus two tablespoons. Those two patterns cover most real-life measuring moments.

Fast Equivalents You Can Trust

• 3/8 cup = 6 tablespoons
• 3/8 cup = 18 teaspoons
• 3/8 cup = 3 fluid ounces (since 1 cup = 8 fl oz)

Metric Marks In Milliliters

Milliliters can help when you’re using a liquid measuring cup with a metric scale. The exact milliliter value depends on which “cup” a chart is using. For U.S. nutrition labeling, the FDA defines 1 cup as 240 mL, which puts 3/8 cup at 90 mL. The older U.S. customary cup is 236.588 mL, which puts 3/8 cup near 89 mL.

In a home kitchen, that small gap rarely changes dinner. For baking, the bigger source of drift is how ingredients sit in a cup—scooped flour, packed brown sugar, or a rounded spoonful. If you measure with steady technique, either 89–90 mL lands you in the right place.

Measuring Three-Eighths Cup In Spoons And Smaller Cups

If your cup set has no 3/8, you can still measure it cleanly. Pick the method that matches what’s on your counter and what you’re measuring.

Method 1: Use Tablespoons

This is the simplest path when you want accuracy and you don’t want to do subtraction in your head. Measure 6 level tablespoons into your bowl. That’s 3/8 cup.

For dry ingredients, level each tablespoon with a straight edge. For liquids, fill each spoon to the brim without spilling. If you’re dealing with sticky ingredients, lightly oil the spoon so the ingredient slides out instead of clinging.

Method 2: Use 1/4 Cup Plus 2 Tablespoons

This is the fastest method in most kitchens because 1/4 cups show up in nearly every set. Fill a 1/4 cup, level it, dump it. Then add 2 level tablespoons.

This combo works well for flour, sugar, oats, chopped nuts, and most liquids. It’s also handy when a recipe calls for 3/8 cup more than once—do the 1/4 cup part first, then finish each measure with two tablespoons.

Method 3: Use 1/2 Cup Minus 2 Tablespoons

If your 1/2 cup is already out, you can back into 3/8 cup. Fill the 1/2 cup, then remove 2 tablespoons before adding it to the bowl.

This can feel clumsy with dry ingredients, since you’re trying to “unfill” a cup. It’s smoother with liquids: fill the 1/2 cup to the line, then pour out two tablespoons into a spare spoon or small cup.

Method 4: Use A Liquid Measuring Cup With mL Marks

For liquids like broth, milk, oil, or citrus juice, a clear liquid measuring cup can be the cleanest. Pour to 90 mL if your cup is using the U.S. nutrition-labeling definition. If your measuring cup is marked in ounces, pour to 3 fl oz.

The FDA’s household measure definitions are laid out in its guidance tied to nutrition labeling, including the 240 mL “cup” used for metric equivalents. FDA guidance on metric equivalents for household measures shows those values in context.

Where People Miss 3/8 Cup Most Often

Most measuring misses come from technique, not math. The fraction is fine. The drift shows up when one cook scoops flour straight out of the bag and another spoons it in, or when one person packs brown sugar hard and another leaves it fluffy.

Dry Vs. Liquid Measuring Tools

A dry measuring cup is meant to be filled to the top and leveled. A liquid measuring cup is meant to be filled to a line while it sits on a flat counter. Mixing them isn’t “wrong,” yet it changes how easy it is to hit the target.

• Dry ingredients: Dry cups and spoons are easier to level.
• Liquids: Liquid cups are easier to read without spills.

Leveling Makes A Bigger Difference Than The Fraction

For flour, cocoa, powdered sugar, and similar powders, a rounded scoop can add more than you’d expect. Use a spoon to fill the measuring cup or spoon, then level with the flat back of a knife or a straight spatula edge.

For granulated sugar, leveling is simple. For brown sugar, most recipes expect it packed unless the recipe says “loosely packed.” For shredded cheese, recipes vary. If the recipe gives a weight, take the weight.

Conversion Table For Common Cup Fractions

If you cook often, it helps to keep a small set of fractions tied to spoons. The row for 3/8 cup is the one you came for, and the nearby rows explain why the “1/4 cup plus 2 tablespoons” trick works so well.

Cup Measure	Tablespoons	Teaspoons
1/16 cup	1 tbsp	3 tsp
1/8 cup	2 tbsp	6 tsp
1/6 cup	2 tbsp + 2 tsp	8 tsp
1/4 cup	4 tbsp	12 tsp
1/3 cup	5 tbsp + 1 tsp	16 tsp
3/8 cup	6 tbsp	18 tsp
1/2 cup	8 tbsp	24 tsp
2/3 cup	10 tbsp + 2 tsp	32 tsp
3/4 cup	12 tbsp	36 tsp
1 cup	16 tbsp	48 tsp

The tablespoon and teaspoon equivalents above match USDA conversion tables used in food composition work. The USDA list includes 3/8 cup as 6 tablespoons and lays out other common measures in the same format. USDA measurement conversion tables show the full set.

How To Hit 3/8 Cup In Real Recipes

Now that you’ve got the math pinned down, here’s how it plays out in the kitchen, ingredient by ingredient. This helps when you’re staring at a mixing bowl and you’re not sure which tool choice will feel clean.

Flour And Powdery Ingredients

Use the “spoon, then level” approach: fluff the flour, spoon it into the 1/4 cup, level it, dump it. Then add two level tablespoons. If you’re measuring cocoa, treat it the same way. If you’re measuring powdered sugar, level with a light hand so you don’t compress it.

If you bake a lot, a kitchen scale is the calmest route. A scale removes the question of how tightly something settled in the cup. When a recipe provides grams, stick to that.

Granulated Sugar And Salt

Granulated sugar behaves predictably in cups and spoons. Use either “6 tablespoons” or “1/4 cup plus 2 tablespoons” and you’ll be set. Salt is similar, though coarse salt crystals can trap air gaps. If the recipe calls for a certain salt type, match it.

Brown Sugar

Most recipes expect brown sugar packed. Pack it into the 1/4 cup so it holds its shape when you tip it out. Then pack two tablespoons the same way. If a recipe says “loosely packed,” skip the firm press and level it gently.

Butter, Shortening, And Sticky Fats

Butter is often measured by sticks and tablespoon marks, which makes 3/8 cup simple: 6 tablespoons of butter. If your butter wrapper has tablespoon lines, cut at the 6-tablespoon mark.

For shortening or nut butter, the tablespoons method is tidy when you lightly coat the spoon with a thin film of oil first. The ingredient slides out, leaving less behind.

Liquids And Thin Sauces

For water, milk, broth, vinegar, or oil, a liquid measuring cup is smooth. Pour to 3 fl oz or 90 mL. Check the line at eye level with the cup on the counter, not lifted in your hand.

Ways To Measure 3/8 Cup When You’re Missing The Right Tool

These options all land on the same target. Pick the one that matches your setup and the ingredient you’re measuring.

Method	What You Need	How To Do It
Tablespoons	1 tbsp spoon	Add 6 level tablespoons to the bowl.
Teaspoons	1 tsp spoon	Add 18 level teaspoons, best for small batches.
Quarter Cup Combo	1/4 cup + tbsp spoon	Fill 1/4 cup, level, then add 2 tablespoons.
Half Cup Subtraction	1/2 cup + tbsp spoon	Fill 1/2 cup, then remove 2 tablespoons before adding.
Fluid Ounces	Liquid cup with oz	Pour to the 3 fl oz line on a level counter.
Milliliters	Liquid cup with mL	Pour to 90 mL for the FDA labeling cup standard.

Quick Checks That Save A Batch

If you’re scaling a recipe or baking something touchy, do a quick sanity check before you mix. Three-eighths of a cup should look like:

• A 1/4 cup measure filled once, plus a small “extra” that’s two tablespoons.
• A little less than a 1/2 cup measure.
• Six clean tablespoons, leveled for dry ingredients.

If your measured pile looks closer to 1/2 cup than 1/4 cup, you’re in the right neighborhood. If it looks tiny next to 1/4 cup, you likely counted tablespoons wrong or used a spoon with a different size marking.

Extra Notes When Recipes Come From Different Places

Cup Size Can Differ By Country

Recipes written in U.S. cups assume U.S. measuring cups. Some countries use a metric cup that’s 250 mL. If you’re using a recipe from a different region, check whether it calls for milliliters. If it does, follow the milliliters and skip cup conversions.

When Weight Beats Volume

For water-like liquids, volume is fine. For powders and chopped ingredients, weight is steadier when a recipe supplies grams. If the recipe gives only cups, use consistent technique—spoon and level for powders, pack when the recipe expects packing, and keep your measuring tools dry.

Decimal Cups Like 0.375

That decimal is the same fraction: 0.375 equals 3/8. Measure it as 6 tablespoons, or as 1/4 cup plus 2 tablespoons.

Wrap Up: The One Measure To Memorize

If you memorize one thing, make it this: 3/8 cup is 6 tablespoons. With that single anchor, you can build the rest in seconds. It keeps your cooking steady, even when your measuring cup set skips the odd sizes.