Conversion Calculator: Convert Length, Weight, Temp & More

How to Use Our All-in-One Conversion Calculator

Get an instant and accurate conversion in three simple steps.

1. Select Your Conversion Type

Start by choosing the category of measurement you need to convert from the main dropdown menu. We support the most common types, including:

• Length (e.g., feet, meters, miles)

• Weight/Mass (e.g., pounds, kilograms, ounces)

• Temperature (e.g., Fahrenheit, Celsius, Kelvin)

• Volume (e.g., gallons, liters, cups)

• Speed (e.g., MPH, km/h, knots)

• Area (e.g., square feet, acres, hectares)

2. Enter Your Value to Convert

In the “From” section, type the number you want to convert (e.g., 100).

3. Choose Your Units

Select the unit you are converting from (e.g., “Pounds”) and the unit you want to convert to (e.g., “Kilograms”). The correctly converted result will appear instantly.

Understanding Your Conversion

A conversion is more than just a number—it’s a precise mathematical relationship. We provide the answer, the formula, and a quick-reference chart to help you understand the result.

The Converted Value

This is the direct and accurate result of your conversion, calculated using internationally recognized standards.

The Formula Used

For full transparency, we show you the exact formula used for the calculation. This is especially helpful for understanding more complex conversions like temperature.

• Example: Converting Fahrenheit to Celsius The formula is: C=(F−32)×95

Common Conversion Quick-Reference Chart

To give you more context, here is a chart of common conversions for some of our most popular categories.

Length | From | To | Multiplier (Conversion Factor) | | :— | :— | :— | | 1 Inch (in) | Centimeters (cm) | 2.54 | | 1 Foot (ft) | Meters (m) | 0.3048 | | 1 Mile (mi) | Kilometers (km) | 1.60934 |

Weight/Mass | From | To | Multiplier (Conversion Factor) | | :— | :— | :— | | 1 Ounce (oz) | Grams (g) | 28.3495 | | 1 Pound (lb) | Kilograms (kg) | 0.453592 | | 1 Kilogram (kg) | Pounds (lb) | 2.20462 |

Frequently Asked Questions About Units and Conversions

What is the difference between the Metric and Imperial systems?

These are the two dominant systems of measurement in the world.

• The Metric System (International System of Units or SI): This is the global standard, used by nearly every country. It is a base-10 system, which makes it logical and easy to scale (100 centimeters in a meter, 1000 meters in a kilometer).

• The Imperial System (or U.S. Customary System): This system is used primarily in the United States for everyday measurements. Its units have more complex relationships (12 inches in a foot, 3 feet in a yard, 5,280 feet in a mile). If you live in Houston, Texas, you use the Imperial system for road signs (miles per hour) and groceries (pounds).

Why doesn’t the U.S. use the metric system for everyday life?

While the U.S. officially sanctioned the metric system in 1866 and it is used universally in science, medicine, and much of the manufacturing industry, its adoption into daily life has been slow. This is due to a combination of historical tradition, public reluctance to change, and the massive cost it would take to update infrastructure, from road signs to tooling in factories.

Can you convert cooking measurements like cups to grams?

This is one of the most common but trickiest conversions. A “cup” is a measure of volume, while a “gram” is a measure of weight. Converting between them requires knowing the density of the ingredient you are measuring.

Concrete Example:

• 1 cup of all-purpose flour weighs about 120 grams.

• 1 cup of granulated sugar weighs about 200 grams.

• 1 cup of water weighs about 236 grams.

Our calculator can convert standard liquid volumes (e.g., fluid ounces, cups, milliliters), but for accurate cooking conversions between volume and weight, a dedicated ingredient-based calculator is necessary.

How is temperature conversion different from other conversions?

Most conversions (like feet to meters) have a zero point that is the same (0 feet = 0 meters). You just multiply by a conversion factor. Temperature scales like Celsius and Fahrenheit have different zero points.

• 0∘C is the freezing point of water.

• 0∘F is a much colder temperature.

Because of this, the conversion formula must account for this offset by adding or subtracting 32, making it a two-step process.

What is a “Nautical Mile” or a “Knot”?

These are specialized units used in maritime and aviation contexts.

• Nautical Mile: A unit of distance based on the Earth’s longitude and latitude. One nautical mile corresponds to one minute of latitude. It is approximately 1.15 standard (statute) miles or 1.852 kilometers.

• Knot: A unit of speed, equal to one nautical mile per hour. If a ship is traveling at 20 knots, it is moving at 20 nautical miles per hour.

How do you convert digital storage units (KB, MB, GB)?

This conversion is more complex than it seems due to two different standards:

• Base-10 (used by manufacturers): This is easier for marketing. 1 kilobyte (KB) = 1000 bytes, 1 megabyte (MB) = 1000 KB. This is why a “1 TB” hard drive shows up as having only about 931 GB on your computer.

• Base-2 (used by operating systems): This is how computers actually process data. 1 kibibyte (KiB) = 1024 bytes, 1 mebibyte (MiB) = 1024 KiB. Your Windows or Mac operating system uses this base-2 system to report storage capacity.

Why is my car’s speedometer in both MPH and km/h?

This is a standard feature on most vehicles sold in North America to allow for easy cross-border travel. In the United States, speed limits are posted in Miles Per Hour (MPH). In neighboring Canada and Mexico, speed limits are in Kilometers Per Hour (km/h). The dual-scale speedometer allows drivers to easily comply with local traffic laws without doing mental math.

What are “conversion factors”?

A conversion factor is the number or formula that defines the relationship between two units. It’s the value you multiply or operate by to get from one unit to another. For example, the conversion factor to get from inches to centimeters is 2.54, because there are exactly 2.54 centimeters in every inch.

What are some common conversion mistakes to avoid?

1. Mixing Units: Accidentally entering a value in feet when you meant to enter it in inches.

2. Approximate vs. Precise: Using a rough mental estimate (like “1 kg is about 2 pounds”) for a task that requires precision.

3. Temperature Order of Operations: Forgetting to subtract 32 before multiplying when converting from Fahrenheit to Celsius.

Take the Next Step with Your Calculations

Now that you have your conversion, you can apply it to other planning and projects.

• Converting measurements for a construction project? Use our Concrete Calculator to determine your material needs.

• For complex cooking conversions from volume (cups) to weight (grams), use our specialized Cooking Conversion Calculator for accurate results.

• If you’re converting currency for travel or online shopping, get the latest exchange rates with our real-time Currency Conversion Calculator.