Everyday tools
Unit Converter
Convert between units of length, weight and mass, temperature, volume, area, speed and digital storage — all in one place. Pick a category, choose what you're converting from and to, type a value, and the answer updates instantly along with the exact conversion factor used. The United States runs on a mix of customary and metric units, so you constantly bounce between them: a recipe lists milliliters but your measuring cup shows fluid ounces, a European bolt is sized in millimeters but your wrench set is in inches, a weather app abroad reads in Celsius. This converter keeps inches, feet, miles, ounces, pounds, Fahrenheit, cups, gallons and miles per hour front and center, and it runs entirely in your browser with no network calls.
Convert a value
Choose units and enter a value
Most categories use a single multiplier; temperature also applies an offset.
Quick single-unit converters
Prefer a dedicated page for one conversion, with a reference table and worked example? Jump straight to the most-used pairs:
How the unit converter works
For length, weight, volume, area, speed and digital storage, every unit is defined relative to one base unit for its category (for example, the meter for length or the gram for mass). To convert, the tool first turns your value into the base unit, then turns the base value into your target unit. That two-step approach means a single multiplier — the conversion factor — does the whole job.
Linear conversion
result = value × (from base-factor ÷ to base-factor)where each unit's base-factor says how many base units it equals (1 inch = 0.0254 m)
Temperature is different because the scales don't share a zero point. Converting Celsius to Fahrenheit isn't just a multiply — you scale by 9/5 and then add 32. The tool handles °C, °F and Kelvin by first converting your value to Celsius, then to the target scale.
Temperature
°F = °C × 9/5 + 32 K = °C + 273.1550 °F → (50 − 32) × 5/9 = 10 °C
Notes & assumptions
- US fluid ounces, cups, pints, quarts and gallons are used (the US gallon is about 3.785 liters, smaller than the UK gallon).
- Weight units convert as mass; "ounce" here means the avoirdupois ounce, not the fluid ounce.
- Digital storage uses decimal units (1 KB = 1,000 bytes) plus binary KiB/MiB/GiB where labeled.
- Results are rounded for display but computed at full precision.
Worked example
Suppose a European furniture listing says a desk is 120 centimeters wide and you want feet. Choose Length, set From to centimeters and To to feet, and enter 120: the tool converts 120 cm to 1.2 m, then divides by 0.3048 m per foot to get about 3.94 feet. Now say a runner abroad ran 10 kilometers and you think in miles — switch From to kilometers, To to miles, enter 10, and you get roughly 6.21 miles. For cooking, a cake recipe calling for 250 milliliters of milk is about 1.06 US cups. And if a forecast in Madrid reads 30 °C, the Temperature category turns it into a balmy 86 °F. The conversion factor shown under each result lets you reuse the same multiplier for similar conversions without reopening the tool.
Frequently asked questions
How do I convert Celsius to Fahrenheit?
Multiply the Celsius temperature by 9/5 (that's 1.8) and add 32. So 20 °C is 20 × 1.8 + 32 = 68 °F. To go the other way, subtract 32 first, then multiply by 5/9: 50 °F becomes (50 − 32) × 5/9 = 10 °C. Unlike length or weight, temperature needs that "+32" offset because the two scales don't start at the same zero.
Is a US gallon the same as a UK gallon?
No. This converter uses US customary units, where one gallon is about 3.785 liters, four quarts, eight pints or 128 fluid ounces. The imperial (UK) gallon is larger, roughly 4.546 liters. The US fluid ounce and cup are also slightly different sizes from their imperial counterparts, so always confirm which system a recipe or spec sheet is using.
How many feet are in a meter?
One meter equals about 3.281 feet, because a foot is defined as exactly 0.3048 meters. Put another way, one foot is 12 inches and each inch is exactly 2.54 centimeters. For quick mental math, a meter is "a yard plus a few inches," which is close enough for rough estimates but not for precise work.
Why is the conversion factor shown?
Seeing the exact multiplier lets you sanity-check the result and reuse it. If converting miles to kilometers shows a factor of about 1.609, you can confidently multiply any mileage by 1.609 in your head or on paper. For temperature there is no single factor because of the offset, so the tool shows the scale-and-shift formula instead.
Does digital storage use 1,000 or 1,024?
It depends on the unit. Decimal units — KB, MB, GB, TB — step by 1,000, which is how drive manufacturers and most networks label capacity. Binary units — KiB, MiB, GiB — step by 1,024 and are what operating systems often report. This converter includes both so you can match whichever your device is using.
Are these conversions exact?
The underlying definitions are exact (an inch is exactly 2.54 cm, a pound is exactly 453.59237 grams), but the displayed answer is rounded for readability. Calculations run at full floating-point precision behind the scenes, so for everyday cooking, travel and DIY the results are accurate. For laboratory or engineering work, use the documented exact factor.