Physikal 
Physikal is a Kotlin units of measurement, physical computing, and dimension analysis library. Currently just extensions for Java units of measurement but we are planning for a Kotlin multiplatform rewrite.
Artifacts
| Core | SI Units | Complete Units | |
|---|---|---|---|
| JVM |  |
 |
 |
Usage
Create units
val small = 10.metre
val large = 10.kilo.metre
Includes all operators
val added = 10.metre + 1.kilo.metre
>> 1010.0 m
val speed = added/10.minute
>> 101 m/min
var aFewSeconds = 5.second
aFewSeconds++
>> 6.0 s
10.peta.watt > 2.watt
>> true
5.gram <= 20.kilo.gram
>> true
(-10.nano.metre).abs()
>> 10.0 nm
## The operator '==' does not always work reliably for quantities;
## the function qeq() should be used instead.
1.kilo.gram == 1000.gram
>> false
1.kilo.gram qeq 1000.gram
>> true
Using different units (SI units & other units)
5.gram + 2.pound
>> 912.18474 g
(13.kilo.gram + 20.pound) convertTo STONE
>> 3.47572100600243466674378 st
Future updates
Currently all quantities are reference types, so heavy usage of this library will involve some level of extraneous allocation and GC. Hopefully we can resolve this issue when / if Kotlin inline classes are expanded to support multiple properties.