Instant Unit Conversions for Everything
Convert length, weight, temperature, speed, cooking measures, shoe sizes, and more — fast, accurate, and free.
Result
0.393701
1 cm = 0.393701 in
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Length & Distance
Meters, feet, miles, km
Area
Sq ft, acres, hectares, m²
Volume & Capacity
Liters, gallons, cups, mL
Weight & Mass
Kg, pounds, ounces, stone
Temperature
Celsius, Fahrenheit, Kelvin
Speed & Pace
MPH, km/h, knots, m/s
Time & Date
Hours, days, age calculator
Pressure
PSI, bar, atm, kPa
Energy & Power
Joules, kWh, BTU, watts
Fuel Economy
MPG, L/100km, fuel costs
Cooking
Cups, grams, recipe scaler
Fashion & Sizing
Shoes, clothing, belts, hats
Screen & Display
Diagonal, aspect ratio
Calculators
Coordinates, distance, sunrise
Smart Calculators
Specialized tools that go beyond simple conversions
Travel Time Estimator
Estimate trip duration by distance and speed
Electricity Cost Calculator
Calculate energy costs from wattage and tariff
Recipe Scaler
Scale recipes up or down by servings
Body Weight Converter
Convert between kg, lb, stone with BMI reference
Age Calculator
Calculate exact age from date of birth
Screen Size Calculator
Diagonal + aspect ratio → width × height
Container Volume
Calculate volume of boxes, cylinders, spheres
Why Use Converter?
Accuracy First
Conversions use precise, industry-standard constants.
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Real-time calculations with no loading delays.
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How It Works
Enter your value
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Select from and to units from 100+ options
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Frequently Asked Questions
What is the most accurate unit converter?
Converter uses industry-standard constants for all calculations. Our conversions are based on internationally accepted definitions — for example, 1 inch = 2.54 cm exactly, and 1 kg = 2.20462 lb.
Are the conversions exact?
Yes, for all standard physics-based units (length, weight, temperature, etc.), the conversions are exact to the precision shown. For approximate lookups like shoe sizes and cooking ingredients, we note that results are typical guidelines.
Can I use this on mobile?
Absolutely. Converter is designed mobile-first — every tool works perfectly on phones and tablets, with large inputs, responsive layouts, and touch-friendly controls.
Is Converter free to use?
Yes, completely free. No sign-ups, no ads, no hidden costs. Just fast, accurate conversions.
What types of units can I convert?
We cover 13+ categories including length, weight, temperature, speed, time, pressure, energy, fuel economy, cooking measures, clothing & shoe sizes, and screen dimensions.
Does it support cooking and shoe sizes?
Yes! Our cooking tools convert cups to grams by ingredient, and our fashion tools convert shoe sizes between US, UK, EU, and CM systems for men, women, and kids.