Unreal Engine (UE) defaults to the following International System (SI) units for measurement:
| Quantity |
Unit |
| Distance/Length |
Centimeters (cm) |
| Mass |
Kilograms (kg) |
| Time |
Minutes (min), Seconds (s) |
| Angles |
Degrees (deg) |
| Speed/Velocity |
Meters per Second (m / s) |
| Temperature |
Celsius (C) |
| Force |
Newtons (N) |
| Torque |
Newton Meters (N • m) |
For more information about all units available in UE, see the Available Units section below.
Change Default Units
You can change the units for any of these quantities in your project in the Unreal Editor. To change these units, follow these steps:
- From the menu bar, select Edit > Project Settings... This opens a new Project Settings window or tab.
- Navigate to Editor > Appearance.
- Expand the category under Units > Advanced.
- You should now see all the quantities of measurement along with their units. To change a quantity, select a new unit from the dropdown menu located next to the quantity you wish to change.
View or change units in Unreal Editor.
Distance/Length, Mass, and Time can use compound units.
Available Units
The following sections contain lists of all units of measurement available in UE, organized by measured quantity:
Distance and Length
| Unit |
Abbreviation |
| SI |
|
| Micrometers |
µm |
| Millimeters |
mm |
| Centimeters |
cm |
| Meters |
m |
| Kilometers |
km |
| Imperial |
|
| Inches |
in |
| Feet |
ft |
| Yards |
yd |
| Miles |
mi |
| Lightyear |
ly |
Velocity and Speed
| Unit |
Abbreviation |
| SI |
|
| Centimeters Per Second |
cm/s |
| Meters Per Second |
m/s |
| Kilometers Per Second |
km/s |
| Imperial |
|
| Miles Per Hour |
mph |
Acceleration
| Unit |
Abbreviation |
| Centimeters Per Second Squared |
cm/s2 |
| Meters Per Second Squared |
m/s2 |
Angles
| Unit |
Abbreviation |
| Degrees |
° , deg |
| Radians |
rad |
Angular Velocity
| Unit |
Abbreviation |
| Degrees Per Second |
deg/s |
| Radians Per Second |
rad/s |
Temperature
| Unit |
Abbreviation |
| Temperature - SI |
|
| Celsius |
C |
| Kelvin |
K |
| Temperature - Imperial |
|
| Farenheit |
F |
Mass
| Unit |
Abbreviation |
| Mass - SI |
|
| Micrograms |
µg |
| Milligrams |
mg |
| Grams |
g |
| Kilograms |
kg |
| Metric Tons |
t, Mg |
| Mass - Imperial |
|
| Ounces |
oz |
| Pounds |
lb |
| Stones |
st |
Density
| Unit |
Abbreviation |
| Density - SI |
|
| Grams Per Cubic Centimeter |
g/cm3 |
| Grams Per Cubic Meter |
g/m3 |
| Kilograms Per Cubic Centimeter |
kg/cm3 |
| Kilograms Per Cubic Meter |
kg/m3 |
Force
| Unit |
Abbreviation |
In Base Units |
| Force - SI |
|
|
| Newtons |
N |
1 N = 1 kg • m / s2 |
| Kilograms Force |
kgf |
1 kgf = 9.80665 kg • m / s2 |
| Kilogram Centimeters Per Second Squared |
kg • cm / s2 |
|
| Force - Imperial |
|
|
| Pounds Force |
lbf |
1 lbf = 32.174049 lb • ft / s2 |
Torque
| Unit |
Abbreviation |
In Base Units |
| Torque - SI |
|
|
| Newton Meters |
N·m |
1 N·m = 1 kg • m2 / s2 |
| Kilogram Centimeters Squared Per Second Squared |
kg • cm2 / s2 |
|
Momentum
| Unit |
Abbreviation |
In Base Units |
| Momentum - SI |
|
|
| Newton Seconds |
N·s |
1 N • s = 1 kg • m / s |
Frequency
| Unit |
Abbreviation |
In Base Units |
| Frequency - SI |
|
|
| Hertz |
Hz |
1 Hz = 1 s-1 |
| Kilohertz |
kHz |
|
| Megahertz |
MHz |
|
| Gigahertz |
GHz |
|
| Revolutions Per Minute |
rpm |
1 rpm = 1/60 s-1 |
Pixel Density
| Unit |
Abbreviation |
| Pixels Per Inch |
PPI |
| Unit |
Abbreviation |
| Byte |
B |
| Kilobyte |
kB |
| Megabyte |
MB |
| Gigabyte |
GB |
| Terabyte |
TB |
Luminous Flux
| Unit |
Abbreviation |
| Lumens |
lm |
Luminous Intensity
| Unit |
Abbreviation |
| Candela |
cd |
Illuminance
| Unit |
Abbreviation |
In Base Units |
| Lux |
lx |
1 lx = 1 lm/m2 |
Luminance
| Unit |
Abbreviation |
| Candela Per Meter 2 |
cd/m2 |
Time
| Unit |
Abbreviation |
| Nanoseconds |
ns |
| Microseconds |
µs |
| Milliseconds |
ms |
| Seconds |
s |
| Minutes |
min |
| Hours |
hr |
| Days |
d |
| Months |
mo |
| Years |
yr |
Pressure
| Unit |
Abbreviation |
In Base Units |
| Pascals |
Pa |
1 Pa = 1 kg / m • s2 |
| Kilo Pascals |
KPa |
|
| Mega Pascals |
MPa |
|
| Giga Pascals |
GPa |
|
Other Units
| Unit |
Abbreviation |
Notes |
| Exposure Value |
EV |
Describes how much light is in a scene. |
| Percentage |
% |
Numerical value between 0 and 100. |
| Multiplier |
|
Unitless quantity that represents multiples of some base quantity. |
| Unspecified |
|
No specified units. |
For more information about coordinate systems, see the following resources:
