Half of 1 ⅓ cups is ⅔ cup.
That's the answer. You can close the tab now if that's all you needed.
But if you've ever stood in your kitchen at 6 PM with a recipe that serves eight and you only need to feed two — or worse, you're halfway through mixing batter and realize you don't have a ⅔ cup measure — you know the answer alone doesn't always help.
What Is 1 ⅓ Cups Anyway
Before we halve it, let's be clear on what we're starting with.
1 ⅓ cups is four-thirds of a cup. That's why four ⅓-cup portions. In fluid ounces, that's 10.67 ounces. In milliliters, roughly 315. In tablespoons, it's 21 ⅓.
It's an awkward amount. Not quite a cup and a half. Not a clean multiple of ¼ or ⅓. It shows up in recipes more than you'd think — quick breads, pancake batters, certain cookie doughs, some soup bases.
And when you need half? 5.Now, ten tablespoons plus two teaspoons. Plus, 158 milliliters. You get ⅔ cup. Which is also awkward. Plus, two ⅓-cup scoops. 33 fluid ounces.
Neither amount fits neatly into standard measuring cup sets. That's the real problem.
Why This Specific Conversion Trips People Up
Most home cooks can halve 1 cup (½ cup). Think about it: halve ½ cup (¼ cup). Halve ¾ cup (⅜ cup — okay, that one stumps people too).
But 1 ⅓? That said, it's a mixed number with a third. Fractions with thirds don't play nice with the standard quarter-cup increments on most measuring cups.
Here's what happens in practice: someone sees "half of 1 ⅓ cups" in a scaled recipe, panics slightly, and does one of three things:
- Guesses. Eyeballs a little more than ½ cup, a little less than ¾ cup. Sometimes it works. Sometimes the muffins come out dense.
- Converts to tablespoons. Counts out 10 tablespoons + 2 teaspoons. Accurate, tedious, and you'll lose count at tablespoon 7.3. Uses a kitchen scale. Weighs the ingredient. This is the pro move — but only if you know the weight equivalent for that specific ingredient.
The conversion itself is simple math. The execution is where it falls apart.
How to Actually Measure Half of 1 ⅓ Cups
If you have a ⅓ cup measure
Scoop two level ⅓ cups. Done. This is the fastest, cleanest method — assuming your ⅓ cup hasn't wandered into the sandbox or the dog's food bin.
If you only have standard ¼, ⅓, ½, 1 cup measures
Use the ⅓ cup twice. Or fill a ½ cup, then add 1 tablespoon + 2 teaspoons. Or fill a ¼ cup three times, then remove 1 tablespoon + 2 teaspoons. None of these are elegant.
If you have a ⅔ cup measure
Congratulations. You own the unicorn of measuring cups. One scoop. Level it. Move on.
If you have a kitchen scale
Weigh it. But you need the weight-per-cup for your specific ingredient.
| Ingredient | Weight of 1 cup | Weight of ⅔ cup (half of 1 ⅓) |
|---|---|---|
| All-purpose flour (spooned & leveled) | 120g | 80g |
| Granulated sugar | 200g | 133g |
| Packed brown sugar | 220g | 147g |
| Butter | 227g | 151g |
| Milk / water / oil | 240g | 160g |
| Honey / maple syrup | 320g | 213g |
| Rolled oats | 90g | 60g |
Pro tip: If your recipe gives weights, use them. Volume measures are inherently inconsistent — flour compacts, brown sugar packs differently, a "cup" of chopped nuts varies wildly by chop size.
If you're measuring something sticky
Honey, molasses, peanut butter, tahini — spray the measuring cup with oil first. Or use the displacement method: fill a liquid measuring cup with ⅔ cup water, add the sticky ingredient until the water line reaches 1 ⅓ cups, then pour out the water. The sticky stuff stays behind, perfectly measured.
If you're scaling a whole recipe
Don't just halve the flour and sugar. Halve everything* — leaveners, salt, spices, liquids. But watch leaveners closely. Baking powder and soda don't always scale linearly at very small or very large quantities. For a simple half-batch, you're usually fine. Quarter-batch? You might need slightly more leavener per unit of flour.
Want to learn more? We recommend what is the value of x 50 100 and how long does it take to count to a million for further reading.
Common Mistakes People Make
Using a liquid measuring cup for dry ingredients
You can do it. But you'll be off. Dry measuring cups are designed to be filled and leveled. Liquid cups have headspace and a pour spout — you can't level them cleanly. A "cup" of flour in a liquid measure is often 10-15% light.
Not leveling
A heaping ⅓ cup is not ⅓ cup. It's maybe ⅜. Two heaping ⅓ cups = ¾ cup, not ⅔. Your biscuits will spread. Your cake may collapse.
Scooping flour directly with the measuring cup
This compacts it. You get up to 30% more flour than the recipe intends. Spoon flour into the cup, then level with a straight edge. Every time.
Confusing weight ounces and fluid ounces
8 fluid ounces = 1 cup volume. But 8 ounces weight* of flour is about 2 cups. Of butter, it's 1 cup. Of honey, it's ⅔ cup. They're different systems. Don't mix them.
Assuming "half of 1 ⅓" is ½ + ⅙ and trying to measure ⅙ cup
Nobody has a ⅙ cup measure. Stop looking.
Practical Tips That Actually Work
Buy a ⅔ cup measure. They exist. OXO makes one. It costs $3. If you bake even occasionally, it pays for itself in saved frustration.
Memorize the tablespoon equivalent. ⅔ cup = 10 tablespoons + 2 teaspoons. 10 + 2. Easy to remember. Faster than you think once you've done it twice.
Keep a conversion cheat sheet taped inside your cabinet door. Mine has:
- ⅔ cup = 10 Tbsp + 2 tsp
- ⅜ cup = 6 Tbsp
- ⅝ cup = ½ cup + 2 Tbsp
- ⅞ cup =
½ cup + 6 Tbsp
Why This Matters More Than You Think
Baking isn't chemistry class — it's controlled chaos. Get the measurements right, and you're not just following a recipe, you're conducting a precise experiment where technique matters as much as ingredients.
A cookie that spreads too much? Likely too much butter or under-leavened. A dense cake? In practice, probably compacted flour or expired leavening agents. The difference between "good" and "wow" often lives in these details.
The One Tool You Actually Need
A digital scale. Consider this: not the fancy $200 kind — a basic one that measures to 1g. Weigh your flour, your butter, your sugar. Consider this: it'll pay for itself in three batches. No guessing, no scooping, no compensation needed.
Yes, it's one more thing to clean up. But it's also the difference between "I followed the recipe exactly" and "I made something amazing."
When to Trust Your Instincts
Read your recipe once before starting. Plus, identify the critical path — what absolutely must be precise? Usually it's flour, sugar, and leaveners. Eggs? They're forgiving. Vanilla extract? Who cares if it's ½ tsp instead of 1?
Butter temperature matters for creaming. So liquid temperature affects gluten development. These aren't measurements you can eyeball forever.
The Real Secret
Most home bakers overthink measurements. On top of that, they get so caught up in being "precise" that they forget to taste, to adjust, to adapt. Your kitchen is not a laboratory. It's a kitchen.
Use these techniques as your foundation. Then trust yourself to make it better, faster, easier — whatever your version of delicious looks like.
The recipe is just the starting point.
