Playing around with scaling a domain against a range. Dropped it into firebug console for a quick and dirty visualization.

curve.js

var range =  [0, 1000],
    domain = [0, 25],
    power = 2;

function calc(v) {
    var normal_domain = domain[1] - domain[0]
      , normal_range  = range[1] - range[0]
      , normal_num = v - domain[0]
      , inter = normal_num / normal_domain
      ;
    
    return range[0] + (normal_range * Math.pow(inter, power));
}

$('body').html('');
var $div;
for (var i = 0, ii = domain[1]; i < ii; i++) {
    $div = $('<div>&nbsp;</div>');
    $div.css({ 
               background: 'red',
               height: '20px',
               width: calc(i, power) + 'px',
               margin: '1px'
             });
    $('body').append($div);
}