300 ml to Cups: Convert 300 Milliliters to Cups
Convert 300 ml to cups: 300 milliliters equals about 1.27 US cups. Learn the exact factor and common uses for this volume.
Why 300 ml Comes Up
300 ml is a common single-serve drink size (a small bottle of water or soda) and a frequent cooking measure. The US cup value helps when you only have cup measures.
Three hundred milliliters equals about 1.27 US cups. Our ml to cups converter returns it directly; 1.27 cups is the rounded figure.
The 300 ml to Cups Formula
One US cup is 236.59 ml, so divide milliliters by 236.59 to get cups. For 300 ml: 300 / 236.59 = 1.268 cups, rounded to 1.27 cups.
The Exact Calculation
For 300 ml: 300 / 236.59 = 1.27 cups. For 250 ml it is 1.06 cups, and for 500 ml it is 2.11 cups.
To go the other way, multiply cups by 236.59: 1.27 × 236.59 = 300.3 ml, close to 300 ml.
Why the US Cup Is 236.59 ml
The US customary cup is 8 US fluid ounces, and one fluid ounce is 29.5735 ml, so 8 × 29.5735 = 236.588 ml, rounded to 236.59 ml.
What 1.27 Cups Looks Like
A 300 ml drink is about 1.27 US cups, just over one cup and a quarter. It is 0.3 of a liter.
For the liter base, our guide to 1 liter to cups covers the 4.23-cup figure.
When You Need 300 ml in Cups
The conversion matters for drinks and small-batch cooking. A 300 ml metric measure is about 1.27 cups when you use cup scoops.
It also helps when a recipe lists 300 ml of broth and you measure in cups.
Frequently Asked Questions
How many cups is 300 ml?
300 ml equals about 1.27 US cups, because 300 / 236.59 = 1.27 cups.
How do I convert 300 ml to cups?
Divide 300 by 236.59 ml: 300 / 236.59 = 1.27 cups.
Is 300 ml more than 1 cup?
Yes. 300 ml is about 1.27 cups, a little over one US cup.
How many liters is 300 ml?
300 ml is 0.3 liters.
How do I convert 1.27 cups to ml?
Multiply 1.27 by 236.59: 1.27 × 236.59 ≈ 300 ml.
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Quick Summary
300 ml equals about 1.27 US cups (300 / 236.59). That is 0.3 liters. The reverse: 1.27 × 236.59 ≈ 300 ml.
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8 oz to mL: What a Standard US Cup Really Holds
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Disclaimer
Unit conversions on this site use internationally recognized, fixed conversion factors (for example, 1 inch = 2.54 cm, 1 pound = 0.45359237 kg, 1 °F = (°C × 9/5) + 32). They are provided for general, informational, and educational use. For applications where accuracy is critical — such as medical dosing, engineering, scientific research, trade, or legal compliance — always verify results against authoritative sources such as the U.S. National Institute of Standards and Technology (NIST) and the official International System of Units (SI) brochure, and follow any applicable local standards.
Exact Constants & Authoritative Sources
Every conversion on this page uses the fixed, internationally agreed constants below — drawn from NIST and the SI Brochure. No values are estimated or rounded as if exact. See the full list on our Sources & Standards page.
- EXACT1 US gallon (gal) = 3.785411784 litres (exact, 231 in³)
- EXACT1 US fluid ounce (fl oz) = 29.5735295625 mL (exact, 1/128 gal)
- EXACT1 US cup = 236.5882365 mL (exact, 8 fl oz)
- EXACT1 US pint (pt) = 473.176473 mL (exact, 16 fl oz)
- EXACT1 US quart (qt) = 946.352946 mL (exact, 32 fl oz)
- EXACT1 litre (L) = 1000 millilitres (definition)
Common Pitfalls & How to Avoid Them
US vs. Imperial (UK) cups
A US cup is 236.59 mL, but a UK/metric cup is 250 mL and an Imperial cup is ~284 mL. Recipes from different countries are not interchangeable drop-in.
Fluid ounce is volume, not mass
A US fl oz is 29.57 mL of volume. 1 fl oz of water ≈ 29.57 g, but 1 fl oz of honey or oil weighs more. Do not treat fluid ounces as grams.
Teaspoon/tablespoon sizes differ
1 US tbsp = 14.7868 mL; 1 US tsp = 4.92892 mL. Metric measuring spoons are 15 mL and 5 mL — close but not exact; for baking precision use weighed grams.
A unit-conversion reference site has no manufacturer-specific or device calibration parameters, so "layered tuning" does not apply here. The only real error-handling is input validation: the converter rejects non-numeric, empty, or out-of-range entries and shows a clear message, then falls back to exact constants above. No estimated or rounded figures are ever presented as exact.
Authoritative sources for this page
- NIST (U.S. National Institute of Standards and Technology) — NIST SP 330 — The International System of Units (SI), 2019 edition
- BIPM (International Bureau of Weights and Measures) — SI Brochure — The International System of Units (9th edition)
Last Updated 2026 | This article was reviewed for accuracy