Unit Conversion Calculators
Professional online calculators for converting units of measurement
Physical Units
Length Units
Convert meters, feet, miles, inches, kilometers and more
Area Units
Convert square meters, acres, hectares, square feet and more
Volume Units
Convert liters, gallons, cubic meters, pints, and more
Mass / Weight Units
Convert kilograms, pounds, ounces, tons, grams and more
Thermal & Energy Units
Temperature Units
Convert Celsius, Fahrenheit, Kelvin, Rankine and historic scales
Power Units
Convert watts, horsepower, BTU/s, calories/second and more
Time & Angle Units
Time Units
Convert seconds, minutes, hours, days, years and quantum time
Angle Units
Convert degrees, radians, gradians, turns and more
Degrees ↔ DMS
Convert decimal degrees to degrees, minutes, seconds
Slope ↔ Angle
Convert road slope (gradient) to angle measurements
Digital Units
Data Volume Units
Convert bytes, kilobytes, megabytes, gigabytes, terabytes
About Unit Conversion
Unit conversion is essential in science, engineering, commerce, and everyday life. These calculators support multiple measurement systems including metric (SI), imperial, US customary, and traditional units from various cultures. Understanding conversions helps with:
- International Trade - Different countries use different units
- Scientific Work - SI units are standard in science
- Engineering - Precision in technical specifications
- Daily Life - Cooking, travel, shopping
- Education - Understanding different systems
- Health - Medical measurements and dosages
Measurement Systems Overview
Metric System (SI)
Base units: meter, kilogram, second, kelvin, ampere, mole, candela
Features: Decimal system, easy conversions (×10, ×100, ×1000)
Used in: Most of the world, all scientific work
Features: Decimal system, easy conversions (×10, ×100, ×1000)
Used in: Most of the world, all scientific work
Imperial System
Base units: foot, pound, gallon (UK), Fahrenheit
Features: Historical origins, non-decimal conversions
Used in: United Kingdom (partially), some Commonwealth countries
Features: Historical origins, non-decimal conversions
Used in: United Kingdom (partially), some Commonwealth countries
US Customary System
Base units: foot, pound, gallon (US), Fahrenheit
Features: Similar to Imperial but with different definitions
Used in: United States
Features: Similar to Imperial but with different definitions
Used in: United States
Traditional Systems
Examples: Chinese (斤, 升), Japanese (尺, 升), historic units
Features: Cultural significance, regional variations
Used in: Specific countries, traditional contexts
Features: Cultural significance, regional variations
Used in: Specific countries, traditional contexts
Tip: When converting between systems, pay attention to precision. Some conversions
are exact (1 inch = 2.54 cm exactly), while others are approximate. Always consider the context
and required accuracy for your application.
Quick Reference - Common Conversions
Length
• 1 inch = 2.54 cm
• 1 foot = 30.48 cm
• 1 mile = 1.609 km
• 1 meter = 3.281 feet
• 1 foot = 30.48 cm
• 1 mile = 1.609 km
• 1 meter = 3.281 feet
Volume
• 1 gallon (US) = 3.785 L
• 1 gallon (UK) = 4.546 L
• 1 liter = 1000 ml
• 1 cup (US) = 237 ml
• 1 gallon (UK) = 4.546 L
• 1 liter = 1000 ml
• 1 cup (US) = 237 ml
Mass
• 1 pound = 453.6 g
• 1 ounce = 28.35 g
• 1 kg = 2.205 pounds
• 1 ton (US) = 907.2 kg
• 1 ounce = 28.35 g
• 1 kg = 2.205 pounds
• 1 ton (US) = 907.2 kg
Temperature
• °F = °C × 1.8 + 32
• °C = (°F - 32) × 5/9
• K = °C + 273.15
• 0°C = 32°F = 273.15K
• °C = (°F - 32) × 5/9
• K = °C + 273.15
• 0°C = 32°F = 273.15K
Power
• 1 HP = 745.7 W
• 1 PS = 735.5 W
• 1 kW = 1.341 HP
• 1 kW = 1000 W
• 1 PS = 735.5 W
• 1 kW = 1.341 HP
• 1 kW = 1000 W
Angle
• 1° = π/180 rad
• 1 rad = 57.296°
• 360° = 2π rad
• 1 turn = 360°
• 1 rad = 57.296°
• 360° = 2π rad
• 1 turn = 360°
Professional Applications
Engineering:
Technical specifications, blueprints, manufacturing
Technical specifications, blueprints, manufacturing
Construction:
Building plans, material quantities, land area
Building plans, material quantities, land area
Medicine:
Drug dosages, body measurements, lab values
Drug dosages, body measurements, lab values
Aviation:
Altitude (feet/meters), speed (knots/km/h)
Altitude (feet/meters), speed (knots/km/h)
Everyday Uses
Cooking & Baking:
Recipe conversions, oven temperatures
Recipe conversions, oven temperatures
Travel:
Distance, fuel consumption, weather
Distance, fuel consumption, weather
Shopping:
Comparing prices per unit, package sizes
Comparing prices per unit, package sizes
Fitness:
Body weight, running distance, calorie burn
Body weight, running distance, calorie burn
Historical Development
Ancient Systems:
Based on body parts (foot, cubit, hand) or daily objects
Based on body parts (foot, cubit, hand) or daily objects
1795 - Metric System:
France introduces decimal-based measurement system
France introduces decimal-based measurement system
1960 - SI System:
International System of Units officially established
International System of Units officially established
1971 - UK Metrication:
United Kingdom begins conversion to metric
United Kingdom begins conversion to metric
Today:
Only USA, Myanmar, and Liberia don't use metric as primary
Only USA, Myanmar, and Liberia don't use metric as primary
Future:
Continuing global standardization on SI units
Continuing global standardization on SI units
Related Calculator Categories
Physical Sciences
Engineering
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