<script language="JavaScript"> //rounds function perRound(no) { result=Math.floor(no)+"." var percents=1000*(no-Math.floor(no))+0.5 result += Math.floor(percents/100) result += Math.floor(percents%100) return(result) } //Calculates Asphalt Tons Needed function aspCalc(form) { //Checks fields for negitive numbers, letters or Null var parsecheck = "" + parseFloat(form.l.value); if(parseFloat(form.l.value)<0 || parseFloat(form.l.value) == 0 || parsecheck == "NaN") { window.alert("Length, Width, Thickness and Density MUST be Positive Numbers."); return false; } var parsecheck = "" + parseFloat(form.w.value); if(parseFloat(form.w.value)<0 || parseFloat(form.w.value) == 0 || parsecheck == "NaN") { window.alert("Length, Width, Thickness and Density MUST be Positive Numbers."); return false; } var parsecheck = "" + parseFloat(form.t.value); if(parseFloat(form.t.value)<0 || parseFloat(form.t.value) == 0 || parsecheck == "NaN") { window.alert("Length, Width, Thickness and Density MUST be Positive Numbers."); return false; } var ctons=0; var tons=0; var length=eval(form.l.value); var width=eval(form.w.value); var depth=eval(form.t.value); ctons=((150.0*(width)*(length)*(depth)/12.0)/2000); form.tons.value=perRound(ctons); //THE FOLLOWING USED FOR YRDS AND FEET //var cyrds = 0; //var cft = 0; //cyrds=((((width)*(length)*(depth)/12.0))/27); //cft=((((width)*(length)*(depth)/12.0))); //asp.yards.value=cyrds; //asp.feet.value=cft; } //Form Help function aspHelp(form) { window.alert("1. Enter the length, width, and thickness of your paving job. 2. Click on the Calculate button.") } </script> <table border="0" cellpadding="8" align="center"> <tr><td><font face="Tahoma" color="#FFF"> <strong></strong></font> <p><font color="#FFF" face="Tahoma" size="3">This calculator will estimate the number of tons of asphalt/hot mix that will be required. This estimate is based on a density for the mix of 150 lbs per cubic foot. Please note that densities will vary somewhat between different mixes, but this value is a standard "rule of thumb" for estimating.</font></p></td></tr> <table border="0" width="350" align="center"> <form name="asp"> <tr><td align="right"><font color="#fff" face="Tahoma">Length (feet)</font></td><td> <font face="Tahoma"><input type="text" name="l" size="8" value=""></font></td></tr> <tr><td align="right"><font color="#fff" face="Tahoma">Width (feet)</font></td><td> <font face="Tahoma"><input type="text" name="w" size="8" value=""></font></td></tr> <tr><td align="right"><font color="#fff" face="Tahoma">Thickness (inches)</font></td><td> <font face="Tahoma"><input type="text" name="t" size="8" value=""></font></td> </tr> <tr><td colspan="2" align="center"><br><font face="Tahoma"> <font color="#000080" size="1"><b><input type="button" class="etbutton" onclick="aspCalc(form)" value="Calculate"></b></font>    <font color="#000080"><input type="reset" class="etbutton" value="Clear All">    </font> </font><font face="Tahoma" color="red"><input type="button" class="etbutton"onclick="aspHelp(form)" value="Help"></td></tr> <tr><td colspan="2" align="center"><hr> <p><font face="Tahoma"><font color="#fff">Hot Mix Ton(s) Required</font> <input type="text" name="tons" value="0" size="8" readonly></font></td></tr> <!--<tr><td><input type="text" name="yards" value="0" readonly size="8">Yards</td></tr> <tr><td><input type="text" name="feet" value="0" readonly size="8">Feet</td></tr>--> </form> </td></tr></table> </html>