Physics

SI Units and Conversion Factors

By Examguru / 13 Oct, 2025 / Download PDF

SI Units and Conversion Factors

SI Units and Their Symbols

Quantity

SI

Symbol

Length

Meter

m

Mass

Kilogram

kg

Time

Second

s

Work and Energy

Joule

J

Electric Current

Ampere

A

Temperature

Kelvin

K

Intensity of Flame

Candela

cd

Angle

Radian

rad

Solid Angle

Steradian

sr

Force

Newton

N

Area

Square Meter

Volume

Cubic Meter

Speed

Meter per second

m/s

Angular Velocity

Radian per second

rad/s

Frequency

Hertz

Hz

Moment of Inertia

Kilogram Square Meter

kg·m²

Momentum

Kilogram per Meter per second

kg·m/s

Impulse

Newton Second

N·s

Angular Momentum

Kilogram Square Meter per second

kg·m²·s⁻¹

Pressure

Pascal

Pa

Power

Watt

W

Surface Tension

Newton per meter

N/m

Viscosity

Newton's second per square meter

N·s·m⁻²

Thermal Conductivity

Watt per meter per degree Celsius

W·m⁻¹·°C⁻¹

Specific Heat Capacity

Joule per kilogram per Kelvin

J·kg⁻¹·K⁻¹

Electric Charge

Coulomb

C

Potential Difference

Volt

V

Electric Resistance

Ohm

Ω

Electrical Capacity

Farad

F

Magnetic Induction

Henry

H

Magnetic Flux

Weber

Wb

Luminous Flux or Photometric Power

Lumen

lm

Intensity of Illumination

Lux

lx

Wavelength

Angstrom

Å

Astronomical Distance

Light Year

Ly

Conversion of Units from One System to Another

Conversion

Value

Length Conversions

 

1 Inch

2.54 centimeters

1 Foot

0.3 meters

1 Yard

0.91 meters

1 Mile

1.60 kilometers

1 Furlong

220 yards

1 Chain

20.11 meters

1 Nautical mile

1.85 kilometers

1 Angstrom

10⁻¹⁰ meters

1 Fathom

1.8 meters

1 Fathom

6 feet

1 Yard

3 feet

1 Mile

5280 feet

1 Square Inch

6.45 square centimeters

1 Square Foot

0.09 square meters

1 Square Yard

0.83 square meters

1 Square Mile

2.58 square kilometers

1 Nautical Mile

6080 feet

1 Acre

104 square meters

Mass and Weight

 

1 Grain

64.8 milligrams

1 Dram

1.77 grams

1 Ounce

28.35 grams

1 Pound

0.4537 kilograms

1 Poundal

0.1383 Newton

1 Dyne

10⁻⁵ Newton

1 Horsepower

746 Watts

Volume Conversions

 

1 Cubic Inch

16.38 cubic centimeters

1 Cubic Foot

0.028 cubic meters

1 Cubic Yard

0.7 cubic meters

1 Liter

1000 cubic centimeters

1 Pint

0.56 liters

Temperature

 

37° Centigrade

98.6° Fahrenheit

50° Centigrade

122° Fahrenheit

-40° Fahrenheit

-40° Centigrade

32° Fahrenheit

0° Centigrade

Final Thoughts

SI units and conversion factors are essential for understanding measurements in science and daily life. From length, mass, and time to temperature and energy, these units help ensure consistency in scientific communication.

For instance, the meter (m) is used to measure length, while the kilogram (kg) measures mass. Conversion factors, like 1 inch = 2.54 centimetres or 1 pound = 0.4537 kilograms, enable easy transitions between different measurement systems. Whether you're working in science, engineering, or simply looking to make quick conversions, having a reliable guide to SI units is crucial for accuracy and clarity in all fields.

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