Free Online Unit Converter

Instantly convert between different units of measurement across length, weight, volume, temperature, and area. This free measurement converter supports metric conversion and imperial measurement units with accurate results for students and everyday use.

Unit Converter

Fast, precise conversions across all units

Conversion
1 meter = 100 centimeters

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    Unit conversion made simple (measurement conversion for length, weight, temperature, area, volume)

    This free unit converter helps you convert units in seconds. Choose a category, enter a value, select a “from” unit and a “to” unit, and the result updates automatically. It’s built for everyday conversions (like feet to meters, kg to lbs, and °C to °F) and for students who need quick, correct answers.

    How to use the unit converter

    1. Select a category (Length, Weight, Temperature, Area, Volume).
    2. Type your value in the “Value” box.
    3. Pick units from the “From” and “To” dropdowns.
    4. Swap units if you want the reverse conversion.

    Length conversions

    Convert common length units like meters, centimeters, kilometers, inches, feet, yards, and miles. This covers common conversions like feet to meters and cm to inches.

    • 1 inch = 2.54 cm
    • 1 foot = 0.3048 m
    • 1 mile = 1.609344 km

    Weight conversions

    Convert kg, grams, milligrams, pounds, and ounces. Useful for quick everyday conversions and school problems.

    • 1 kg = 1000 g
    • 1 g = 1000 mg
    • 1 lb = 0.45359237 kg

    Temperature conversions

    Convert Celsius, Fahrenheit, and Kelvin using exact formulas.

    • °F = (°C × 9/5) + 32
    • °C = (°F − 32) × 5/9
    • K = °C + 273.15

    Area conversions

    Convert square meters, square feet, acres, and hectares for land and space calculations.

    • 1 m² = 10.7639 ft²
    • 1 acre = 4046.8564224 m²
    • 1 hectare = 10,000 m²

    Volume conversions

    Convert liters, milliliters, gallons, quarts, cups, and fluid ounces for cooking and daily use.

    • 1 L = 1000 mL
    • 1 US gallon = 3.785411784 L
    • 1 Imperial gallon = 4.54609 L

    Note: if you support both US and Imperial gallons, add a toggle to avoid wrong results.

    Conversion chart (quick unit conversion chart)

    Use this metric conversion chart as a quick reference, or use the unit conversion calculator above for any custom value.

    Conversion Result
    1 meter to centimeters 100 cm
    1 foot to meters 0.3048 m
    1 kilogram to pounds 2.20462 lb
    1 pound to kilograms 0.45359237 kg
    0°C to Fahrenheit 32°F
    100°C to Fahrenheit 212°F
    1 liter to milliliters 1000 mL
    1 acre to square meters 4046.8564224 m²

    Conversion factors and metric vs imperial

    Most unit conversion uses a conversion factor (a fixed ratio), like 1 ft = 0.3048 m. Temperature is different because it uses formulas, like °F = (°C × 9/5) + 32.

    If you’re comparing metric vs imperial, metric (SI) is base-10 (meters, kilograms), while imperial measurement and US customary units include feet, miles, and pounds.

    Frequently Asked Questions

    Both. It’s a measurement converter and a unit conversion calculator that converts values across metric (SI) and imperial/US customary units.
    Yes. Use the conversion chart (also called a metric conversion chart) on this page for quick reference, or use the converter for any custom value.
    The conversion table uses standard conversion constants. Minor differences across sites usually come from rounding and how many decimal places they show.
    A unit converter changes a value from one unit to another using a fixed conversion factor or formula (for example feet to meters, kg to lbs, or °C to °F).
    Select a category, enter a value, choose the “From” unit and “To” unit, and the result updates instantly. Use the swap button to reverse the conversion.
    Metric (SI) uses base-10 units like meters and kilograms. Imperial/US customary uses units like feet, miles, and pounds. This tool converts between both systems.
    A conversion factor is a ratio that connects two units. For example, 1 ft = 0.3048 m. Multiply by the factor to change units without changing the real-world quantity.
    Exactly 1 inch = 2.54 cm.
    Use lb = kg × 2.20462. Example: 5 kg × 2.20462 = 11.0231 lb.
    The exact formula is °F = (°C × 9/5) + 32. To convert Fahrenheit to Celsius, use °C = (°F − 32) × 5/9.
    Yes. A US gallon is 3.785411784 L, while an Imperial gallon is 4.54609 L. If your conversion looks “wrong,” check which gallon type is being used.
    Differences usually come from rounding. Some tools round conversion factors early. For high precision work, keep more decimal places and avoid rounding until the final result.
    Yes. It uses standard conversion constants and exact temperature formulas. Any small differences you may see are typically due to display rounding.

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