Unit Converter — Convert Length, Weight, Temperature & More Online
Welcome to the all-in-one unit converter — a free online calculator that helps you convert between metric and imperial measurements with accurate results in real time. Whether you are cooking, traveling, studying, or working on engineering tasks, you can convert length, weight, temperature, area, speed, time, data storage, volume, and pressure units instantly. The instant conversion engine updates as you type, so you never need to press a submit button. Each unit converter uses industry-standard formulas to provide accurate results, and you can quickly swap units, copy answers to your clipboard, or clear inputs in a single tap. It works on any device — desktop, tablet, or phone — with no installation required.
How to Use This Unit Converter
- Choose a category from the tab bar above (length, weight, temperature, and more) to load the right tool.
- Pick your units in the "From" and "To" dropdowns, then type any value — the real-time conversion updates the result instantly. Use the swap button (↔) to reverse the direction with a single click.
- Copy the result with the copy button to paste anywhere, or use clear to start a new conversion. The formula used is shown below every result for transparency.
All Conversion Categories Available
📏 Length Converter — A complete distance converter that handles every common unit, from kilometers and meters down to millimeters, plus miles, yards, feet, inches, and nautical miles. Use it as a metric to imperial conversion tool for everyday tasks like km to miles, feet to meters, or inches to cm. This measurement converter doubles as a meter to feet calculator and length calculator online for students, engineers, and travelers.
⚖️ Weight Converter — A precise mass converter supporting kilograms, grams, milligrams, metric tons, pounds, ounces, stones, and US tons. Quickly perform kg to lbs, pounds to kilograms, or grams to ounces conversions. This kg to pounds calculator and weight unit converter is ideal for fitness, shipping, and cooking. It also works as an ounce to gram, stone to kg, and general mass unit calculator with verified ratios.
🌡️ Temperature Converter — A reliable temperature unit converter between Celsius, Fahrenheit, Kelvin, and Rankine. Use it for celsius to fahrenheit or fahrenheit to celsius conversions, as a kelvin converter for science class, or as a quick c to f converter. It also handles body temperature converter checks and weather temperature conversion, making it a flexible degree converter online for daily and professional use.
🍳 Cooking Measurement Converter — A practical kitchen converter and recipe converter for cups, tablespoons, teaspoons, milliliters, liters, fluid ounces, pints, quarts, and gallons. Convert cups to ml, tablespoon to teaspoon, ml to cups, cup to liter, tablespoon to ml, or teaspoon to ml in seconds. This cooking unit converter and baking measurement converter helps home cooks scale recipes accurately across regions.
📐 Area Converter — A complete land area converter and area unit converter supporting square meter, square kilometer, square foot, square inch, square yard, square mile, acre, and hectare. Easily switch between sq ft to sq meter, acre to square feet, hectare to acre, or sq meter to sq feet. It works equally well as a square meter calculator and land measurement converter for real estate.
🚀 Speed Converter — A fast speed unit converter and velocity converter between km/h, miles/h, meter/s, knot, and foot/s. Useful for kmph to mph, km/h to m/s, mph to kmph, or knot to kmh conversions for driving, aviation, and sailing. This wind speed converter and speed calculator online provides reliable values for sports, travel, and physics homework alike.
⏱️ Time Converter — A simple time unit converter and time calculator covering seconds, minutes, hours, days, weeks, months (30-day average), and years. Perform hours to minutes, minutes to seconds, days to hours, or weeks to days conversions effortlessly. It also handles convert hours to seconds and days to minutes tasks, making it a complete time unit calculator for planning and project work.
💾 Digital Storage Converter — A precise file size converter and storage unit converter from bit to byte all the way up to petabyte. Quickly switch MB to GB, GB to TB, KB to MB, or bytes to MB. This data size calculator and bit to byte converter helps developers, IT pros, and students understand megabyte to gigabyte ratios and plan storage with confidence using standard 1024-based conversions.
🧪 Volume Converter — A flexible volume unit converter and volume calculator for liter, milliliter, cubic meter, cubic centimeter, cubic foot, cubic inch, US gallon, US quart, and UK gallon. Convert liter to gallon, ml to liter, cubic meter to liter, gallon to liter, or cubic feet to liter in a tap. It is equally handy for chemistry labs, fuel calculations, and home brewing.
🔩 Pressure Converter — A scientific pressure converter online supporting Pascal, Kilopascal, Bar, PSI, Atmosphere, Torr, and mmHg. Use it for psi to bar, pascal to bar, atm to psi, bar to psi, or kpa to psi conversions. This tire pressure converter and mmhg to atm tool serves engineers, mechanics, and medical professionals as a dependable pressure calculator.
Frequently Asked Questions
How do I convert kilometers to miles?
Multiply the kilometer value by 0.621371 to get miles. For example, 10 km × 0.621371 = 6.21371 miles. To go the other way, multiply miles by 1.609344 to get kilometers. Our length converter does this automatically — just choose kilometer in the "From" field and mile in the "To" field, then type your value.
What is the formula for Celsius to Fahrenheit?
The formula is °F = (°C × 9/5) + 32. So 100 °C equals (100 × 1.8) + 32 = 212 °F, which is the boiling point of water. To reverse it, use °C = (°F − 32) × 5/9. Our temperature converter applies these standard formulas automatically and shows the exact equation beneath every result for clarity.
How many tablespoons are in a cup?
One US cup contains exactly 16 tablespoons. One tablespoon equals 3 teaspoons, so a cup also equals 48 teaspoons or roughly 237 milliliters. These ratios are based on US customary measurements. Our cooking converter handles cup, tablespoon, teaspoon, ml, and other recipe units instantly, which is helpful when scaling baking and cooking recipes up or down.
How many square feet in an acre?
One acre equals 43,560 square feet, or about 4,046.86 square meters. This is roughly the size of a standard American football field without the end zones. The acre is a common land area unit in the United States and United Kingdom. Use our area converter to switch between acres, hectares, square feet, and square meters with verified accuracy.
How many MB in a GB?
One gigabyte equals 1,024 megabytes in binary (used by operating systems and RAM) or 1,000 megabytes in decimal (used by hard drive manufacturers). Our digital storage converter uses the binary 1,024 standard, which is the most common in computing. That means 1 GB = 1,024 MB, 1 TB = 1,024 GB, and so on up the scale.
How do I convert kg to pounds?
Multiply the kilogram value by 2.20462 to get pounds. For example, 70 kg × 2.20462 ≈ 154.32 lbs. To convert pounds back to kilograms, multiply by 0.453592. This is useful for fitness tracking, shipping weights, and international recipes. Our weight converter performs the math instantly and shows the exact formula used beneath the result for full transparency.
What is 1 bar in PSI?
One bar equals approximately 14.5038 PSI (pounds per square inch). Bar is widely used in Europe for tire pressure and industrial systems, while PSI is the standard unit in the United States. To reverse: 1 PSI ≈ 0.0689476 bar. Our pressure converter supports bar, PSI, pascal, kPa, atm, torr, and mmHg with scientifically verified ratios.
How many seconds in a day?
There are 86,400 seconds in one day. That comes from 24 hours × 60 minutes × 60 seconds. A week therefore contains 604,800 seconds, and a standard 365-day year contains 31,536,000 seconds. Our time converter handles seconds, minutes, hours, days, weeks, months (30-day average), and years, making it useful for project planning and scheduling.
How many liters in a gallon?
One US gallon equals approximately 3.78541 liters, while one UK (imperial) gallon equals about 4.54609 liters. The two gallons are different sizes, so it is important to choose the correct one. Our volume converter supports both US gallon and UK gallon separately, along with liters, milliliters, cubic meters, cubic feet, quarts, and other common volume units.
What is the difference between mass and weight?
Mass measures the amount of matter in an object and is expressed in kilograms or grams. Weight is the force gravity exerts on that mass, technically measured in newtons. In everyday use, we say "weight" for both, and that is how our converter treats kilograms, pounds, and ounces — as standard mass units, which is accepted practice for most daily tasks.
Why Use an Online Unit Converter?
A free online converter gives you instant unit conversion without installing any app, signing up, or worrying about subscription fees. You get an accurate measurement tool that works on any device — phone, tablet, or desktop — with results that match industry-standard formulas. Whether you need quick switching between metric and imperial units for travel, cooking, study, fitness, or engineering, an online tool is faster than a physical calculator and always up to date. Bookmark this page and you have a complete conversion toolkit at your fingertips, ready whenever you need a reliable answer in seconds.
About Our Conversion Formulas
Every converter on this page uses a base-unit conversion method: each unit has a precise multiplier relative to a single base (for example, meters for length, kilograms for mass). Your input is first normalized to the base unit, then converted to the target unit, which keeps the math consistent and prevents compound rounding. Temperature uses direct industry-standard formulas because its conversions are non-linear. All ratios are regularly verified against authoritative sources, so the underlying math has no rounding errors — only the displayed result is rounded for readability.