Rink

Rink is an open source unit-aware calculator. It can be used for physics and engineering calculations, as well as dimensionality analysis.

Rink supports most systems of measurements including SI, CGS, natural, international customary, US customary, UK customary, as well as historical measurements. In addition, Rink supports currency conversions.

#Features

• Arbitrary precision math
• Shows SI physical quantities
• Finds applicable SI derived units automatically
• Detailed error messages
• Helps with dimensionality analysis, such as by offering unit factorizations and finding units for quantities.
• Temperature conversions

#Install

The most common version of Rink is the command line interface rink.

You can download it from Releases, or install it through your package manager:

#Examples

How much does it cost to run my computer each year? Say it uses 100 watts for 4 hours per day, and use the US average electricity cost.

> 0.1545$/kWh * 100W * (4 hours / day) to $/year
approx. 22.57196 USD / tropicalyear

If you made a solid sphere of gold the size of the moon, what would the surface gravity be?

> volume of moon * (19.283 g/cm^3) * G / (radius of moon)^2
approx. 9.365338 meter / second^2 (acceleration)
> ans to gravity
approx. 0.9549987 gravity (acceleration)

Ever heard someone joke about Americans measuring fuel efficiency as rods per hogshead? Let’s try with the average US car fuel efficiency.

> 9.4 km/l to mpg
approx. 22.11017 mpg (fuel_efficiency)
> 9.4 km/l to rods per hogshead
approx. 445741.0 rod / ushogshead (fuel_efficiency)

And then you wonder, wait, what even are these units anyway?

> hogshead
Definition: ushogshead = 2 liquidbarrel = approx. 238480942.3 millimeter^3 (volume; m^3)
> liquidbarrel
Definition: liquidbarrel = 31.5 usgallon = approx. 119240471.1 millimeter^3 (volume; m^3)
> rod
Definition: rod = 5.5 yard = 5.0292 meter (length; m)