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138 Grams to Cups Conversion

MeasurementsCalculator.com 138 Grams to Cups Ingredient Conversion Calculator

138 Grams to Cups Ingredient Conversion Calculator

© Measurements Calculator

How many cups is 138 grams when converted to cups? Since a gram measures weight and a cup measures volume, the cup amount depends on the ingredient’s density. For water, 138 grams equals approximately 0.5833 cups. For all-purpose flour, the volume is closer to 1.104 cups, and for granulated sugar, approximately 0.69 cups.

Try the 138 grams to cups calculator above to get the exact cup volume for any of 80+ ingredients, or browse the detailed reference tables below.

Contents hide
1 138 Grams to Cups Conversion
1.1 138 Grams to Cups Ingredient Conversion Calculator
1.2 What is 138 Grams in Cups?
1.3 How to Convert 138 Grams to Cups
1.4 138 Grams to Cups Ingredient Conversion Chart
1.5 138 Grams Converted to Other Units
1.6 138 Grams in Common Recipes
1.7 Measuring 138 Grams Without a Kitchen Scale
1.8 Grams & Cups: A Cook’s Primer
1.9 FAQ: 138 Grams to Cups
1.10 Nearby Grams to Cups Conversions

What is 138 Grams in Cups?

On average, 138 grams ≈ 0.5833 US cups
(138 grams of water = 0.5833 cups exactly)

Water

138 g = 0.5833 cups

All-Purpose Flour

138 g = 1.104 cups

Granulated Sugar

138 g = 0.69 cups

Butter

138 g = 0.6079 cups

Honey

138 g = 0.4059 cups

Milk

138 g = 0.575 cups
Why these numbers differ: A US cup is a fixed volume (236.588 mL), but every ingredient has its own density. Honey is heavy and dense, so the same weight in grams fills a smaller cup volume than something light and airy like flour. That’s why 138 grams of honey fits in 0.4059 cups while the same weight of flour spreads across 1.104 cups.

Measurementscalculator.com Converting 138 Grams to Cups

How to Convert 138 Grams to Cups

Step 1: Identify Your Ingredient First

Unlike a simple unit-to-unit conversion, grams-to-cups isn’t a single fixed formula. The answer for 138 grams depends entirely on what you’re measuring. The general formula is:

Cups = 138 ÷ (grams per cup)

Where the divisor is the ingredient’s density expressed in grams per US cup (g/cup). Note that this is division — to find cups when you know grams, you divide weight by the density factor. The opposite direction (cups to grams) uses multiplication.

Quick mental shortcut: For water and milk, the divisor is roughly 240 (water is 236.59, milk is 240). So 138 grams of water is approximately 138 ÷ 240 = 0.5833 cups — good enough for everyday cooking.

Step 2: Worked Example with Water

Water is the simplest case. One US cup holds 236.59 mL of water, and water has a density of 1 g/mL, so:

Cups of water = 138 ÷ 236.59 = 0.5833 cups

That means 138 grams of water equals about 0.5833 US cups. Milk is very close at 0.575 cups.

Step 3: Worked Example with Flour

Goal: Convert 138 grams of all-purpose flour to cups

1. Look up the flour density factor:

All-purpose flour ≈ 125 g/cup

2. Divide:

138 ÷ 125 = 1.104 cups

Answer: 138 grams of all-purpose flour ≈ 1.104 cups.

Step 4: Cheat Sheet for 138 Grams

  • Water: 138 g ≈ 0.5833 cups
  • Milk: 138 g ≈ 0.575 cups
  • All-purpose flour: 138 g ≈ 1.104 cups
  • Bread flour: 138 g ≈ 1.0615 cups
  • Cake flour: 138 g ≈ 1.2105 cups
  • Granulated sugar: 138 g ≈ 0.69 cups
  • Brown sugar (packed): 138 g ≈ 0.6273 cups
  • Powdered sugar: 138 g ≈ 1.15 cups
  • Butter: 138 g ≈ 0.6079 cups
  • Vegetable oil: 138 g ≈ 0.633 cups
  • Honey: 138 g ≈ 0.4059 cups
  • Maple syrup: 138 g ≈ 0.4286 cups
  • Table salt: 138 g ≈ 0.5055 cups
  • Baking powder: 138 g ≈ 0.7188 cups
  • Baking soda: 138 g ≈ 0.6273 cups
  • Cocoa powder: 138 g ≈ 1.38 cups
  • Cornstarch: 138 g ≈ 1.0781 cups
  • Rolled oats: 138 g ≈ 1.5333 cups
  • Uncooked rice: 138 g ≈ 0.69 cups

Cup size matters: A US cup is 236.588 mL, a metric cup is 250 mL, and a UK imperial cup is 284 mL. The numbers on this page assume a US cup — the standard for most American recipes. For metric cups, multiply the US cup result by approximately 0.946; for UK imperial cups, multiply by approximately 0.833.

138 Grams to Cups Conversion Chart for Common Ingredients

138 Grams to Cups Ingredient Conversion Chart

138 Grams to Cups Quick Reference Chart Ingredient Cups per 138 Grams Water 0.5833 cups Milk 0.575 cups Heavy Cream 0.5948 cups Vegetable Oil 0.633 cups All-Purpose Flour 1.104 cups Whole Wheat Flour 1.15 cups Granulated Sugar 0.69 cups Brown Sugar (packed) 0.6273 cups Powdered Sugar 1.15 cups Honey 0.4059 cups Maple Syrup 0.4286 cups Butter 0.6079 cups Salt (Table) 0.5055 cups Baking Powder 0.7188 cups Baking Soda 0.6273 cups Cocoa Powder 1.38 cups Ground Coffee 1.725 cups Cornstarch 1.0781 cups Rolled Oats 1.5333 cups Uncooked Rice 0.69 cups Note: Values are approximate and may vary by brand, packing method, or humidity. © Measurements Calculator
Download Chart (PNG)

Measurementscalculator.com 138 Grams Conversion Table

138 Grams Converted to Other Units

Unit Value Notes
US Cups (water-based) 0.5833 cups Average reference
Milliliters (water) 138 mL For water, 1 g = 1 mL
Tablespoons (water) 9.333 tbsp 1 tbsp ≈ 14.79 g of water
Teaspoons (water) 28.0 tsp 1 tsp ≈ 4.93 g of water
Fluid Ounces (water) 4.666 fl oz 1 US fl oz ≈ 29.57 g water
Pints (water) 0.2916 pints 1 US pint ≈ 473.18 g water
Quarts (water) 0.1458 quarts 1 US quart ≈ 946.35 g water
Ounces (mass) 4.868 oz 1 oz = 28.3495 g
Pounds (mass) 0.3042 lb 1 lb = 453.592 g
Kilograms 0.138 kg 1 kg = 1,000 g
Milligrams 138000 mg 1 g = 1,000 mg
Metric Cups 0.552 cups Metric cup = 250 mL
UK Imperial Cups 0.4857 cups UK cup = 284.131 mL

138 Grams in Common Recipes

See what 138 grams equals in cups for the ingredients you’ll use most in real cooking and baking:

🍞 Bread Baking (Bread Flour)

138 g = 1.0615 cups
Bread flour is denser than all-purpose flour because it has more protein. Use a kitchen scale for the most accurate hydration ratios.

🎂 Cake Baking (Cake Flour)

138 g = 1.2105 cups
Cake flour is lighter and finer than AP flour, so the same weight fills a larger cup volume. Sift before measuring for best results.

🍪 Cookies (Brown Sugar, packed)

138 g = 0.6273 cups
Brown sugar is measured packed — pressed firmly into the cup. Loose-packed brown sugar will read about 15% lighter.

🥞 Pancakes & Muffins (Milk)

138 g = 0.575 cups
Milk is slightly denser than water (about 1.03 g/mL). For most recipes you can substitute milk and water 1:1 by weight without recalculating.

🍯 Sweetening with Honey

138 g = 0.4059 cups
Honey is much denser than sugar — the same gram weight occupies far less volume. Substituting honey for sugar 1:1 by weight changes texture.

🧈 Butter (softened or melted)

138 g = 0.6079 cups
In the US, one cup of butter = 2 sticks = 227 g. Convenient reference: 113 g ≈ 1 stick ≈ ½ cup.

🌾 Oatmeal (Rolled Oats)

138 g = 1.5333 cups
Rolled oats are airy, so a cup weighs only about 90 g. Steel-cut oats are denser and won’t follow this conversion.

🍚 Rice (uncooked)

138 g = 0.69 cups
Uncooked long-grain white rice is about 200 g/cup. Rice triples in volume when cooked, so plan portions accordingly.

☕ Espresso/Drip Coffee (Ground)

138 g = 1.725 cups
A standard drip coffee uses ~10 g per cup of brewed coffee. For pour-over, a 1:16 ratio is a great starting point.

Measuring 138 Grams Without a Kitchen Scale

Without a scale handy? You can still measure out 138 grams using common kitchen tools — just remember the result will be a volume estimate, and accuracy depends heavily on the ingredient.

Use Measuring Cups for Liquids

For water, milk, and other liquids with density close to 1 g/mL, you can measure directly. 138 grams of water ≈ 0.5833 US cups ≈ 138 mL. Most glass liquid-measuring cups have mL markings that make this easy.

Use Tablespoons and Teaspoons for Small Amounts

For dry powders like flour, sugar, or salt, tablespoons can replace a scale if you’re careful to level off each spoonful with a flat edge. As a baseline (for water): 138 grams ≈ 9.333 tablespoons ≈ 28.0 teaspoons.

Volume-First Reference (Ingredient-Specific)

  • Flour: Spoon flour into the cup, then level — don’t scoop with the cup (that compresses and adds ~25% weight). 138 g of AP flour ≈ 1.104 cups.
  • Granulated sugar: Sugar packs predictably, so cup measurements stay close to accurate. 138 g ≈ 0.69 cups.
  • Brown sugar: Pack firmly into the cup. 138 g packed ≈ 0.6273 cups.
  • Butter: Use the wrapper markings (in the US, 1 stick = 113 g = ½ cup). 138 g ≈ 0.6079 cups.
Pro Tip: Even a basic $15 digital kitchen scale eliminates guesswork. For bread, pastry, and chocolate work — where small differences matter — weighing is non-negotiable. Volume measures vary up to 20% depending on how aerated, packed, or settled the ingredient is.

Grams & Cups: A Cook’s Primer

The Gram — A Universal Weight

A gram (g) is the metric system’s base unit of mass, equal to one-thousandth of a kilogram. Different from a cup, a gram is identical anywhere in the world and doesn’t change based on how an ingredient is scooped, packed, or sifted. When a recipe specifies 138 grams, it’s telling you exactly how much mass to add — no ambiguity. That’s why professional bakers and serious home cooks favor weighing over volume measuring.

The Cup — A Familiar Volume

A cup is a unit of volume used in cooking, especially in the United States. It represents how much space an ingredient occupies, not how much it weighs. Cups come in a few different sizes depending on which standard you’re working from, so converting 138 grams to cups depends on which “cup” your recipe is referring to.

US Customary Cup

236.588 mL. Used in nearly all American recipes and on US nutrition labels.

US Legal Cup

240 mL. Defined by FDA for nutrition labeling. Slightly larger than the customary cup.

Metric Cup

Exactly 250 mL. Standard in Canada, Australia, New Zealand, and many European countries.

UK Imperial Cup

284.131 mL (½ imperial pint). Mostly historical now — modern UK recipes typically use weight or mL.

Why Density Drives the Conversion

Density is mass per unit of volume. To turn 138 grams (a mass) into cups (a volume), you have to apply the ingredient’s density. Water is the baseline at 1 g/mL, which puts 138 grams of water at exactly 0.5833 US cups. Honey is roughly 1.4× denser, so 138 grams of honey fits in only 0.4059 cups. Flour is much less dense in cup form (lots of air between particles), so 138 grams of flour spreads to 1.104 cups — about double the water volume.

FAQ: 138 Grams to Cups

❓ How many cups is 138 grams?

The answer depends on the ingredient’s density. For 138 grams:
  • Water: 0.5833 cups
  • All-purpose flour: 1.104 cups
  • Granulated sugar: 0.69 cups
  • Butter: 0.6079 cups
  • Honey: 0.4059 cups
  • Table salt: 0.5055 cups

⚖️ Why does 138 grams of different ingredients fill different cup volumes?

Because grams measure weight while cups measure volume. The same weight of a dense ingredient like honey takes up less space than the same weight of a light, airy ingredient like flour. The cup itself doesn’t change — only what fills it changes. Honey is roughly 3.4× denser than flour in a measuring cup, which is why 138 g of honey (0.4059 cups) takes much less volume than 138 g of flour (1.104 cups).

📏 What’s the formula to convert 138 grams to cups?

Use simple division:
Cups = Grams ÷ (grams per cup)
For 138 grams of water (236.59 g/cup):
138 ÷ 236.59 = 0.5833 cups.
Swap in the right density value for whichever ingredient you’re working with — see the cheat sheet above.

🥛 Is the answer the same for a metric cup vs. a US cup?

Close, but not identical. A US customary cup holds 236.588 mL; a metric cup (used in Australia, Canada, New Zealand, and parts of Europe) is exactly 250 mL — a 5.7% difference. The US legal cup used on nutrition labels is 240 mL. The traditional UK imperial cup (284.131 mL) is noticeably larger and is rarely used in modern recipes. So 138 grams of water = 0.5833 US cups but only 0.552 metric cups.

🎯 Is volume measurement accurate enough for 138 grams of an ingredient?

For everyday cooking, yes. For baking — especially anything with flour, leavening agents, or precise hydration ratios — a digital scale is more reliable. Volume measures vary by 15-25% depending on how packed, sifted, or settled an ingredient is. Weight does not.
Tip: If you must use volume for flour, spoon the flour into the cup and level it off with a knife. Scooping the cup directly into the flour bag can pack in 25-50% more flour than the recipe expects.

📊 Quick reference: 138 grams → cups (common ingredients)

Ingredient g per cup 138 g = cups
Water236.590.5833
All-purpose flour1251.104
Granulated sugar2000.69
Butter2270.6079
Vegetable oil2180.633
Honey3400.4059
Table salt2730.5055
Baking powder1920.7188
Cocoa powder1001.38
Rolled oats901.5333
Values are averages; actual results vary by brand, temperature, humidity, and packing method.

Nearby Grams to Cups Conversions

Explore the conversions immediately before and after 138 grams on the same scale:

See the full Grams to Cups conversion hub for every gram value from 1 to 1000, plus ingredient-specific charts and printable references. Need the reverse direction? Visit our Cups to Grams converter. You may also find these related tools useful: Grams to Tablespoons, and Grams to Teaspoons.