15 categories · free forever

Free Online Unit Converter

Convert length, weight, temperature, volume, speed, digital storage, currency and more — instantly, accurately and with no sign-up. ConvertEase makes everyday and scientific conversions effortless.

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Length Converter

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Most searched

Jump straight to a step-by-step guide with formulas, examples and quick-reference tables for the conversions people look up most.

Pounds to Kilograms

Convert lbs to kg with the exact 0.45359237 factor and a handy reference table.

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Centimeters to Inches

Convert cm to inches (divide by 2.54) for sizing, screens and crafts.

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Celsius to Fahrenheit

Use °F = (°C × 9/5) + 32 with worked examples and a temperature chart.

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Miles to Kilometers

Convert miles to km (× 1.60934) for travel, running and driving distances.

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Centimeters to Pixels

Convert cm to px at 96 DPI — essential for web and print design.

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MB to GB

Convert megabytes to gigabytes for file sizes, storage and data plans.

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Meters to Feet

Convert meters to feet (× 3.28084) for height, construction and sport.

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mph to km/h

Convert miles per hour to kilometers per hour (× 1.60934) for speeds.

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Browse all conversion guides

Everything in one tool

All measurement categories

ConvertEase supports 15 conversion categories covering thousands of unit pairs — from everyday cooking measures to scientific and engineering units.

Length & Distance

Meter, kilometer, centimeter, millimeter, mile, yard, foot, inch, nautical mile and more.

Weight & Mass

Kilogram, gram, milligram, pound, ounce, stone, ton and metric ton.

Temperature

Celsius, Fahrenheit, Kelvin, Rankine and Réaumur with exact formulas.

Area

Square meter, square foot, square mile, acre, hectare and more.

Volume

Liter, milliliter, gallon (US/UK), cubic meter, cup, pint and quart.

Time

Second, minute, hour, day, week, month, year, decade and century.

Speed

Meter per second, km/h, mph, foot per second, knot and mach.

Pressure

Pascal, kilopascal, bar, psi, atmosphere, mmHg and torr.

Energy

Joule, kilojoule, calorie, kilocalorie, watt-hour, kWh and BTU.

Power

Watt, kilowatt, horsepower, BTU per hour and more.

Digital Storage

Bit, byte, kilobyte, megabyte, gigabyte, terabyte and petabyte.

Angle

Degree, radian, gradian, minute and second of arc, revolution.

Fuel Economy

Miles per gallon, km per liter, liters per 100 km and more.

Currency

USD, EUR, GBP, JPY, CAD, AUD, CHF, CNY, INR and RUB (indicative).

Cooking

Cup, tablespoon, teaspoon, fluid ounce, gram and milliliter.

How unit conversion works

A unit converter changes a measurement from one unit into another while keeping the same real-world quantity. Most conversions work by relating every unit to a common base unit. For example, in the length category the base unit is the meter: a kilometer is 1,000 meters and an inch is 0.0254 meters. To convert between any two units, ConvertEase divides by the source factor and multiplies by the target factor, giving precise results every time.

Temperature is a special case because the scales do not share a single zero point. Converting Celsius to Fahrenheit uses the formula °F = (°C × 9/5) + 32, while Celsius to Kelvin simply adds 273.15. ConvertEase shows the exact formula alongside each result so you can see — and trust — how the answer was calculated.

Why choose ConvertEase

  • Fast and accurate: instant results with adjustable precision up to 10 decimal places.
  • Truly comprehensive: 15 categories and thousands of unit pairs in a single page.
  • Transparent: every conversion shows the formula and factor used.
  • Private: conversions run in your browser; your history stays on your device.
  • Free forever: no account, no paywall, no download.

Whether you are a student checking homework, a cook scaling a recipe, a traveler comparing distances, a developer sizing layouts, or an engineer working with scientific units, ConvertEase gives you the answer in seconds. Explore our conversion guides for in-depth explanations of the most common calculations.

Answers

Frequently asked questions

Is ConvertEase free to use?

Yes. ConvertEase is completely free with no sign-up, no download and no usage limits. You can run unlimited conversions across all 15 categories directly in your browser.

How accurate is the unit converter?

ConvertEase uses standard, internationally accepted conversion factors and lets you choose up to 10 decimal places, so results are accurate enough for schoolwork, cooking, engineering and everyday tasks.

How do I convert lbs to kg?

To convert pounds to kilograms, multiply the pound value by 0.45359237. For example, 10 lbs × 0.45359237 = 4.54 kg. Select Weight, choose pound and kilogram, then enter your value. See our lbs to kg guide for more.

Does ConvertEase work on mobile?

Yes. ConvertEase is fully responsive and works on phones, tablets and desktops. It also remembers your dark-mode preference and recent conversions on the same device.

Are the currency rates live?

Currency conversions use indicative reference rates and are intended for quick estimates, not financial transactions. For trades or transfers, always check a live rate from your bank or a financial provider.

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