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SassMeister-input.scss

// ----
// Sass (v3.3.0.rc.1)
// Compass (v0.13.alpha.10)
// ----

    
    
    // ==================================================================== 
    // Unit Conversion
    // ==================================================================== 
    // 
    // Functions:
    // --------------------------------------------------------------------  
    // 
    //  NUMBER:
    //  
    //  isNaN($value)  - returns true or false if type-of($value)==number
    // 
    //  number($value) - returns a unitless number.
    // 
    //  int($value)    - returns a unitless integer. 
    // 
    //  uint($value)   - returns a unitless unsigned integer. 
    //
    // 
    //  UNITS: 
    // 
    //  px($value)     - converts a number or unit to px.
    //                     
    //  em($args...)   - converts a number or unit to em. 
    // 
    //                    To adjust for em compounds you can add
    //                    aditional arguments to calculate the 
    //                    visual em size. em(visual-size,....)
    //                               
    //                    Example:  em(2, 2em, 2em) => 0.5em
    //
    //  rem($value)    - converts a number or unit to rem. 
    // 
    //  pt($value)     - converts a number or unit to pt. 
    // 
    //  pc($value)     - converts a number or unit to pc. 
    // 
    //  in($value)     - converts a number or unit to in. 
    // 
    //  cm($value)     - converts a number or unit to cm. 
    //
    // 
    // PERCENTAGE:
    // 
    //  pct($value,$base:100)   - similar to precentage, but takes a base
    //                            value (100%) to be used for calculating 
    //                            the precent value returned
    //                            
    //                            Example:  pct(1,100)     => 1%   
    //                                      pct(1,1)       => 100%
    //                                      pct(50,250)    => 20%
    //                                      pct(10px,16px) => 62.5%
    //                                      pct(1em,16px)  => 100%
    //   
    // ANGLE:
    // 
    //  deg($value)     - converts a number or angle unit to deg.  
    // 
    //  grad($value)    - converts a number or angle unit to grad.
    //
    //  turn($value)    - converts a number or angle unit to turn.
    //
    //  rad($value)     - converts a number or angle unit to rad.  
    // 
    // 
    // ==================================================================== 
    // Unit Conversion Table
    // http://www.translatorscafe.com/cafe/units-converter/typography/
    //      1px = 0.0625pc;
    //      1px = 0.75pt;  
    //      1px = 0.010416667in;    
    //      1px = 0.264583333mm;
    //      1px = 0.026458333cm;
    //
    // Angles
    // http://www.w3.org/TR/css3-values/#angles
    //      Full circle = 360deg = 400grad =  1turn = 2πrad
    //      1deg =  1.111111111grad  (400/360)
    //      1deg =  0.002777778turn  (1/360)
    //      1deg =  0.017453293rad   (180/π) 
    // 
    // ====================================================================
    
    
    // Base font scale (http://pxtoem.com/)
    // - used when calculating em and rem
    $base-font-scale:100% !default;
    
    // Number 
    @function isNaN($val){  @return type-of($val)!=number; }
    @function number($val){ @return if(isNaN($val), null, if(unitless($val), $val, $val/($val*0+1))); }
    @function int($val){ 
        @if(isNaN($val)){@return null;}
        $val:number($val); 
        @return if($val<0,ceil($val),floor($val)); 
    }
    @function uint($val){ @return if(isNaN($val), null, abs(int($val))); }   
    // Aliases  
    @function num($val){@return number($val);}
    @function parseFloat($val){@return number($val);} // Really a math thing
    @function parseInt($val){@return int($val);}      // Really a math thing

    // Conversion using pixel as base
    @function px($val){
        @if(isNaN($val)){@return null;}
        $u:unit($val);
        $u:if($u==px,1,
           if($u==em,0.0625 * 100/number($base-font-scale),
           if($u==rem,0.0625 * 100/number($base-font-scale),   
           if($u==pt,0.75, 
           if($u==pc,0.0625,
           if($u==in,0.010416667,
           if($u==mm,0.264583333, 
           if($u==cm,0.026458333, 
           1))))))));
        @return number($val) / $u * 1px;
    }
    @function em($args...){
        $val:nth($args,1);
        @if(isNaN($val)){@return null; }
        $em:if(unitless($val),$val * 1em,number(px($val)) * 0.0625em * 100/number($base-font-scale));
        @for $i from 2 through length($args){$em:$em / number(em(nth($args,$i)))}
        @return $em;
    }
    @function rem($val){ @return if(isNaN($val), null, if(unitless($val), $val * 1rem, number(px($val)) * 0.0625rem * 100/number($base-font-scale) )); }
    @function pt($val) { @return if(isNaN($val), null, if(unitless($val), $val * 1pt,  number(px($val)) * 0.75pt)); }
    @function pc($val) { @return if(isNaN($val), null, if(unitless($val), $val * 1pc,  number(px($val)) * 0.0625pc)); }
    @function in($val) { @return if(isNaN($val), null, if(unitless($val), $val * 1in,  number(px($val)) * 0.010416667in)); }
    @function mm($val) { @return if(isNaN($val), null, if(unitless($val), $val * 1mm,  number(px($val)) * 0.264583333mm)); }
    @function cm($val) { @return if(isNaN($val), null, if(unitless($val), $val * 1cm,  number(px($val)) * 0.026458333cm)); }
    @function pct($val,$base:1){ @return if(isNaN($val), null, percentage(number(px($val))/number(px($base)))); }
    
    // Angle conversion using deg as base
    @function deg($val){
        @if(isNaN($val)){@return null;}
        $u:unit($val);
        $u:if($u==deg ,1,
           if($u==grad,1.111111111,
           if($u==turn,0.002777778, 
           if($u==rad, 0.017453293, 
           1))));
        @return number($val) / $u * 1deg;
    }
    @function grad($val){ @return if(isNaN($val),null,if(unitless($val),$val * 1grad,number(deg($val)) * 1.11111111grad)); } 
    @function turn($val){ @return if(isNaN($val),null,if(unitless($val),$val * 1turn,number(deg($val)) * 0.002777778turn)); } 
    @function rad($val) { @return if(isNaN($val),null,if(unitless($val),$val * 1rad ,number(deg($val)) * 0.017453293rad)); }
    
    
    
    
    .test { px2em:em(24px)}
    .test { em2px:px(1.5em)}
    
    
    
    
    

SassMeister-output.css

.test {
  px2em: 1.5em;
}

.test {
  em2px: 24px;
}