Unit Converter

How to Use

Start by choosing one of the three category cards at the top: Length (millimeters to miles), Weight (milligrams to metric tons), or Volume (milliliters to gallons). Type the number you want to convert into the Value field, then pick the unit it is currently in from the From dropdown. As soon as you enter a valid value, the tool displays a grid of result cards showing that amount expressed in every unit within the category at once, so there is no second dropdown to fiddle with and no convert button to press. Switching categories clears your entry and resets the From unit, keeping the screen uncluttered. Very small results are shown in scientific notation and larger numbers are formatted with thousands separators, with the display rounded to six decimal places so the figures stay readable.

Why This Tool Is Useful

Most converters force you to choose both a from unit and a to unit, then convert one pairing at a time. This one shows every conversion in the category simultaneously, which is faster when you are comparing options or are not sure which target unit you actually need. It is genuinely useful for everyday tasks: scaling a recipe, reading a foreign measurement on a package, working out shipping weights, or checking a distance in both miles and kilometers. The conversions rely on fixed, internationally standard factors rather than rounded approximations, so the numbers are trustworthy for school, work, travel, and the kitchen. And because it runs entirely in your browser, there is nothing to install and no waiting.

Cups to grams by ingredient: why one cup is never one weight

The single most common kitchen conversion is cups to grams, and it is also the one a normal converter cannot do. The reason is density. A cup is a measure of volume (how much space something fills), while a gram is a measure of weight (how much that space weighs). One cup of all-purpose flour weighs about 125 grams, but one cup of granulated sugar weighs around 200 grams, and one cup of honey tips the scale at roughly 340 grams. The cup is the same size every time; the ingredient packed into it is what changes the number.

That is why a generic unit converter, including the volume section of this tool, can convert one cup into milliliters or fluid ounces but cannot tell you the grams. To go from a volume of an ingredient to its weight, you need a density value for that specific ingredient. The flagship table on this page provides those density-based gram weights for the ingredients home cooks reach for most, so you can convert cups to grams for flour, sugar, butter, rice, oats, and honey without guessing.

Cooking measurement conversions: cups, fluid ounces, milliliters, and beyond

When a recipe mixes units, the math is easier once you memorize a few fixed relationships. These are volume-to-volume conversions, which means they do not depend on the ingredient. The converter's Volume category handles the units it lists directly, which are milliliters, liters, US gallons, US quarts, US pints, US cups, and US fluid ounces. This tool uses US customary measures, so a US cup is about 237 ml (236.588 ml) and a US fluid ounce is about 29.57 ml, which is why 8 fluid ounces make exactly one cup.

Tablespoons and teaspoons are not separate units in the converter, but the relationships below are still handy reference points when a recipe lists an amount in a unit you do not have a measuring tool for, or when you are dividing or multiplying a batch.

• 1 US cup = 8 fl oz = about 237 ml (236.588 ml)
• 1 US cup = 16 tablespoons = 48 teaspoons
• 1 tablespoon = 3 teaspoons = about 14.8 ml
• 1 teaspoon = about 4.9 ml
• 1 US pint = 2 cups = 473 ml
• 1 US quart = 2 pints = 4 cups = 946 ml
• 1 US gallon = 4 quarts = 3.785 liters

How the converter works: fixed factors and a common base unit

Internally the tool stores one conversion factor per unit, expressed relative to a base unit for each category: meters for length, grams for weight, and liters for volume. When you enter a value and a From unit, it multiplies your number by that unit's factor to get the amount in the base unit, then divides by every other unit's factor to fill in the result grid. For example, entering 100 with Centimeters selected multiplies by 0.01 to reach 1 meter, then divides to show 1000 mm, 0.001 km, 39.37 inches, and so on.

Because these factors are exact international definitions (an inch is precisely 0.0254 m, a pound is 453.592 g), the results carry full floating-point precision and only the display is rounded to six decimal places. This is reliable for any conversion that stays within a single dimension, such as length to length, weight to weight, or volume to volume.

Length and weight conversions: metric and imperial side by side

Beyond the kitchen, the Length and Weight categories cover the everyday metric-to-imperial swaps that trip people up. In Length you can move between millimeters, centimeters, meters, kilometers, inches, feet, yards, and miles. In Weight you have milligrams, grams, kilograms, metric tons, ounces, and pounds. Because every unit appears in the result grid at once, a single entry answers several questions: type a marathon distance in kilometers and instantly see it in miles, yards, and feet.

This is handy for travel (reading road signs in km), fitness (logging weights in lb or kg), DIY projects (mixing inches and centimeters), and international shipping where parcels are weighed in both kilograms and pounds.

Converting a recipe from cups to grams, step by step

Baking by weight is more accurate than baking by volume because it removes the variation in how tightly you pack a cup. To convert a cup-based recipe to grams, take each ingredient one at a time and look up its per-cup weight in the table below, then multiply by the number of cups the recipe calls for.

If a recipe needs 2 cups of all-purpose flour and 1.5 cups of granulated sugar, that is 2 times 125 = 250 grams of flour and 1.5 times 200 = 300 grams of sugar. For partial cups, use the fractional columns in the table or scale proportionally. Liquids measured by volume, like milk or water, can stay in milliliters using the volume relationships above, since 1 cup of water is very close to 237 grams anyway.

• Identify each dry ingredient measured in cups
• Look up its grams-per-cup weight in the table below
• Multiply that weight by the number of cups required
• Add a kitchen scale to your workflow for the most consistent results

Cups to grams by ingredient (density-based weights)