Mag is a library for dealing with physical quantities and units.

Quantities are created by multiplying scalar values by a unit type. These units are named after common abbreviations:

use mag::{length::{ft, m, mi}, time::{h, s}};

let a = 1.0 * ft;
assert_eq!(a.to_string(), "1 ft");

let b = a.to::<m>();
assert_eq!(b.to_string(), "0.3048 m");

let c = 30 * s;
assert_eq!(c.to_string(), "30 s");

let d = 60.0 / s;
assert_eq!(d.to_string(), "60 ㎐");

let e = 55.0 * mi / h;
assert_eq!(e.to_string(), "55 mi/h");

• Easy to understand and use
• Performs conversions between units (SI, imperial)
• Units are not discarded when creating quantities
• Fast compile time
• No external dependencies

If mag doesn't fit your needs, you could try the uom crate, which has many more features.