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Sass: Relational Operators

Relational operators determine whether numbers are larger or smaller than one another. They automatically convert between compatible units.

  • <expression> < <expression> returns whether the first expression’s value is less than the second’s.
  • <expression> <= <expression> returns whether the first expression’s value is less than or equal to the second’s.
  • <expression> > <expression> returns whether the first expression’s value is greater than to the second’s.
  • <expression> >= <expression>, returns whether the first expression’s value is greater than or equal to the second’s.
@debug 100 > 50; // true
@debug 10px < 17px; // true
@debug 96px >= 1in; // true
@debug 1000ms <= 1s; // true

Unit-less numbers can be compared with any number. They’re automatically converted to that number’s unit.

@debug 100 > 50px; // true
@debug 10px < 17; // true

Note that numbers with incompatible units can’t be compared. For example pixels with seconds:

@debug 100px > 10s;
//     ^^^^^^^^^^^
// Error: Incompatible units px and s.