_base-10-rem.scss

$base-font-size:16px;

@mixin base-10-rem($property, $values...) {
  $length:length($values);
	$base-value:10px;
	$px-values:"";
	$rem-values:"";

	@for $i from 1 through $length {
		$tmp:$base-value * nth($values, $i);
		$px-values:#{$px-values + $tmp};
		@if $i < $length {
			$px-values:#{$px-values + " "};
		}
	}

	@for $i from 1 through $length {
		$tmp:($base-value / $base-font-size) * nth($values, $i);
		$rem-values:#{$rem-values + $tmp}rem;
		@if $i < $length {
			$rem-values:#{$rem-values + " "};
		}
	}

	#{$property}:$px-values;
	#{$property}:$rem-values;
}

// Usage
div {
	@include base-10-rem(margin, 0, 0, 1.5, 0);
	@include base-10-rem(padding, 2);
}