1/3 Cup to Tbsp Conversion Chart and Measuring Guide

Every home cook has been there: recipe in hand, measuring cup buried somewhere under the stack, and a recipe calling for 1/3 cup. The good news is that you probably already have everything you need sitting in your utensil drawer. One-third cup converts to exactly 5 tablespoons plus 1 teaspoon, a combination that works perfectly with standard measuring spoons. This guide breaks down exactly what 1/3 cup equals in tablespoons, how to measure it without a dedicated cup, and where those numbers come from.

1/3 cup equals: 5 tbsp + 1 tsp · 1 cup: 16 tbsp · 1/3 cup in ml: 78.86 ml · 1 tbsp: 15 ml

How many tbsp are in 1/3 cup?

One-third US cup equals approximately 5.33 tablespoons in decimal form, but the practical measuring equivalent is 5 tablespoons plus 1 teaspoon. The National Institute of Standards and Technology (NIST) sets the standard: 1 tablespoon equals 15 milliliters, and since 1 cup contains 16 tablespoons, one-third of that works out to exactly 16/3 tablespoons.

Exact tablespoon equivalent

The math is straightforward. According to USDA’s Measurement Conversion Tables, 1 cup equals 16 tablespoons, which means 1/3 cup equals 5 1/3 tablespoons. Since you cannot measure 1/3 of a tablespoon with standard utensils, the practical workaround is to add 5 full tablespoons plus 1 teaspoon. Because 1 teaspoon equals 1/3 of a tablespoon, this combination gives you exactly 5 + 1/3 = 5.33 tablespoons.

Tablespoon plus teaspoon breakdown

The Shamrock Foods conversion chart confirms this as the foodservice standard: 1/3 cup = 5 tablespoons + 1 teaspoon. Every reputable cooking authority, from Spice Up The Curry to Erren’s Kitchen, cites this same conversion. The result totals 16 teaspoons, since 1 cup equals 48 teaspoons (16 tbsp × 3 tsp).

Does 6 tbsp equal 1/3 cup?

Six tablespoons falls slightly short of a true 1/3 cup. While some home cooks round up to 6 tablespoons, this creates a measurable difference in recipes, especially in baking where precision matters.

Why 6 tbsp is not exact

Six tablespoons equals only 6 tbsp, whereas 1/3 cup requires 5.33 tablespoons. The gap is 2/3 of a tablespoon, or roughly 10 milliliters. For a recipe calling for 1/3 cup of an ingredient, using 6 tablespoons instead gives you approximately 10 ml more than intended. According to The Harvest Kitchen, this error can noticeably affect the texture and moisture content of baked goods.

Common mistake and correction

The error comes from thinking 1/3 cup equals approximately 5.33, which rounds to 5, and then adding one more tablespoon “for safety.” But that brings you to 6, not 5.33. The accurate alternative remains 5 tablespoons plus 1 teaspoon. A teaspoon is one-third of a tablespoon, so adding it to your 5 tablespoons gives you the correct 5.33.

How to make 1/3 cup with measuring spoons?

You do not need a 1/3 cup measure to get an accurate 1/3 cup. With a standard set of measuring spoons and a few simple steps, you can measure 1/3 cup precisely every time.

Step-by-step with tbsp and tsp

First, locate your tablespoon measuring spoon. Fill it and level it off with a straight edge—this counts as 1 tablespoon. Repeat this process until you have added 5 level tablespoons to your mixing bowl. Next, take your teaspoon measure. A level teaspoon added to the 5 tablespoons completes the conversion: 5 tbsp + 1 tsp = 1/3 cup. The math checks out: 5 tablespoons equal 5 tbsp, and 1 teaspoon equals 1/3 tablespoon, giving you 5 + 0.33 = 5.33 tablespoons, which is exactly 1/3 cup.

For butter and soft ingredients

When measuring butter or other soft fats, the packing method matters. For butter, use the tablespoon measure to scoop and then level with the flat side of a knife for accuracy. Do not compress the butter into the spoon. For sticky ingredients like honey or molasses, spray the measuring spoon lightly with cooking spray first—the fat helps the ingredient release cleanly and gives you a more accurate measurement.

How Many Tablespoons in a Cup?

The foundation of all US cooking measurements is the relationship between cups and tablespoons. Understanding this basic ratio makes every fractional conversion simpler to calculate.

Full cup fractions chart

One US cup contains exactly 16 tablespoons, per the USDA’s food composition laboratory. From this base, you can derive any fraction: 1/2 cup = 8 tbsp (half of 16), 1/4 cup = 4 tbsp (a quarter of 16), and 1/3 cup = 5.33 tbsp (one-third of 16). The Cook Like Czechs conversion chart notes that the US legal cup, as defined by the FDA, equals 240 ml, making the 16-tablespoon standard consistent across most domestic measurements.

1/3 cup in context

Compared to other common fractional cups, 1/3 cup sits between 1/4 cup and 1/2 cup. In milliliters, it equals approximately 78.86 ml according to The Harvest Kitchen, though NIST rounds this to 80 ml for practical kitchen use. This variation between 78.86 ml and 80 ml reflects the difference between precise calculation and rounded approximation—both are acceptable in cooking contexts.

Which is bigger, 1/3 or 1/4 cup?

One-third cup is larger than one-quarter cup. This difference matters when scaling recipes or substituting measurements.

Size difference

The comparison is straightforward in decimal terms: 1/3 cup equals 0.333 cups, while 1/4 cup equals 0.25 cups. That means 1/3 cup is approximately 33% larger than 1/4 cup. In fluid ounces, 1/3 cup equals 2.67 fl oz, while 1/4 cup equals 2 fl oz—a difference of about 0.67 ounces, or roughly 20 ml.

Tablespoon equivalents

The Weekend Bakery conversion reference confirms the tablespoon difference: 1/3 cup requires 5 tablespoons plus 1 teaspoon (5.33 tbsp), while 1/4 cup needs only 4 tablespoons. That 1.33-tablespoon difference explains why a recipe calling for 1/3 cup of flour will yield a noticeably different result if you mistakenly use 1/4 cup.

How to measure 1/3 cup step by step

Follow these steps to measure exactly 1/3 cup using standard measuring spoons or a combination of cup measures.

1. Step 1: Grab your tablespoon measuring spoon. For dry ingredients like flour or sugar, scoop and level with a straight edge (like a knife). For liquids, pour to the brim and level off.
2. Step 2: Repeat the tablespoon measure 5 times. You now have 5 tablespoons, which equals slightly less than 1/3 cup.
3. Step 3: Take your teaspoon measuring spoon. Fill and level it once. This adds the critical 1/3 tablespoon that makes up the difference.
4. Step 4: Combine the 5 tablespoons with the 1 teaspoon in your mixing bowl. You now have exactly 1/3 cup.
5. Step 5: Verify your total: 5 tablespoons + 1 teaspoon = 16 teaspoons, which equals 1/3 of the 48 teaspoons in a full cup.

Confirmed vs. Unconfirmed

Measurement conversions in the US system are well-established, but some nuances remain subject to interpretation.

“There are 16 tablespoons in 1 cup. So, to find out how many tablespoons make up a 1/3 cup, just do a quick calculation: 1/3 × 16 = approximately 5.33.”

— Erren’s Kitchen

“1/3 cup = 5 tablespoons plus 1 teaspoon.”

— The Harvest Kitchen

For US home cooks, the practical path forward is clear: keep a set of measuring spoons handy and remember the 5 tablespoon + 1 teaspoon rule for 1/3 cup. This works whether you are measuring flour for bread, butter for cookies, or oil for salad dressing. The USDA and NIST standards have been consistent for decades, and the foodservice industry relies on these same conversions daily. If you encounter a recipe that specifies 1/3 cup and you only have spoons, you now have the exact formula to replicate it without error.