Free Online Unit Converters & Calculators
Convert units quickly and accurately with Smart Unit Calc. Use our free online conversion tools and calculators for length, weight, temperature, area, volume, time, speed, pressure, energy and many more measurements.
Online Unit Converter
Use the Smart Unit Calc universal converter to convert measurements between different units. Select the unit category, enter your value and choose the units you want to convert.
Popular Unit Converters
Quickly access some of the most commonly searched unit conversions.
CM to Inches Converter
Convert centimeters to inches instantly with the exact conversion formula.
Convert cm to inches →Inches to CM Converter
Convert inches to centimeters with accurate results and conversion examples.
Convert inches to cm →LBS to KG Converter
Convert pounds to kilograms using the standard conversion factor.
Convert lbs to kg →Fahrenheit to Celsius
Convert Fahrenheit to Celsius with a simple online calculator.
Convert Fahrenheit →Unit Converter Categories
Explore Smart Unit Calc's complete collection of measurement conversion tools.
Free Online Calculators
Use practical calculators for mathematics, finance, everyday calculations, construction and other common tasks.
Percentage Calculator
Calculate percentages, percentage changes and percentage differences.
Age Calculator
Calculate age from a date of birth and find the exact age in years, months and days.
Discount Calculator
Calculate discounts, final prices and savings.
Loan Calculator
Estimate loan payments, interest and repayment amounts.
Percentage Change Calculator
Calculate the percentage increase or decrease between two values.
Average Calculator
Calculate the arithmetic mean of multiple numbers.
Length Conversion Guide
Length conversion is used to convert measurements between metric and imperial units. Smart Unit Calc provides accurate conversions for centimeters, meters, kilometers, inches, feet, yards and miles.
Common Length Conversions
| Conversion | Result | Calculator |
|---|---|---|
| 1 inch to cm | 2.54 cm | Inches to CM |
| 1 cm to inches | 0.3937007874 inches | CM to Inches |
| 1 foot to cm | 30.48 cm | Feet to CM |
| 1 meter to feet | 3.280839895 feet | Meters to Feet |
| 1 kilometer to miles | 0.6213711922 miles | KM to Miles |
Why Use Smart Unit Calc?
Smart Unit Calc is designed to make unit conversion and everyday calculations simple, fast and accessible. Our tools are designed around accurate formulas and practical conversion information rather than unnecessary content.
Accurate Calculations
Our conversion tools use standardized conversion factors and mathematical formulas to calculate results.
Easy to Use
Enter a value, select your units and get your result without complicated steps.
Useful Conversion Information
Many converter pages include formulas, examples, conversion tables and links to related conversions.
Mobile Friendly
Smart Unit Calc is designed to work across desktop, tablet and mobile devices.
Frequently Asked Questions
What is a unit converter?
A unit converter is a tool that converts a numerical measurement from one unit into another equivalent unit, such as centimeters to inches or kilograms to pounds.
Are Smart Unit Calc converters free?
Yes. Smart Unit Calc provides free online unit conversion tools and calculators.
How accurate are unit conversions?
Conversion accuracy depends on the conversion factor and the number of decimal places displayed. Our calculators use standard conversion factors and allow results to be presented with appropriate precision.
Can I convert metric and imperial units?
Yes. Smart Unit Calc supports many metric, imperial, US customary and other commonly used measurement units.
What calculators are available?
Smart Unit Calc is designed to provide calculators for mathematics, finance, everyday calculations, measurements and other practical purposes.
Explore Smart Unit Calc