jQuery.fontWall.js

$.fn.fontWall = function(options){
  
	var options = $.extend({
	
		init:13,fontRetio:1,heightRetio:0.8
		
	},options);
	
	var text = $(this).text(),
		text = text.split('/'),
		textWrap = [];
		
	for(i=0; i<text.length;i++){
		textWrap.push('<span class="fontWall">'+text[i]+'</span>');
	};
	
	$(this).html(textWrap);
	
	var resizeElm = $(this),
		outW = resizeElm.width();
		
	resizeElm.find('.fontWall').each(function(n){
		this.elm = $(this);
		
		if( this.elm.text().length <= 1 ){
			
			var newSize = outW;
			
		}else{
			var inW = this.elm.css({
		
				display:'inline',
				whiteSpace:'nowrap'
				
			}).width();
	
			var ratio =  outW / inW,
				newSize = ratio * options.init * options.fontRetio;
		};
		
		this.elm.css({
		
			'font-size': newSize + 'px',
			'line-height' : options.heightRetio
			
		});
		
		if( this.elm.text().match(/\s/g) ){
			whiteSpace = this.elm.text().match(/\s/g).length;
		}else{
			whiteSpace = 0;
		};
		
		var inW = $(this).width(),
			parWidth = outW-inW,
			wordSpace = parWidth/whiteSpace;
			
		this.elm.css({'word-spacing' : wordSpace , visibility:'visible' ,display:'block'});
		
	});
};

$(this.self).find('.typographyText').each(function(){
    $(this).setRatio({init:14,fontRetio:1.1,heightRetio:0.9});
});

main.html

<div class="typographyText">typographyText</div>