Goldfish Aquarium Calculator from Bristol Aquarists' Society

<body bgcolor="#CCCCFF" background="../../back4.jpg" text="#0000FF" marginwidth="0" marginheight="0" leftmargin="0" topmargin="0" class="main"> <a name="top"></a><p align="center" class="headlink"><br>| <a href="../../index.htm" target="_top">Home</a> | <a href="info.htm" target="_top">Back to Background Information about Goldfish</a> | <a href="../goldfish.htm" target="_top">Back to Goldfish Varieties</a> |<br> </p> <h3 align="center">AQUARIUM CALCULATOR </h3> <p>This aquarium calculator will help you convert between Imperial, metric and US units of measure. There are a couple of important points we would like to make first, about stocking levels and total weight. </p> <h4>Stocking level</h4> <p>One of the most important things to get right is knowing how many goldfish you can keep in order to reduce the risk of poor water quality (see <a href="keeping-fs.htm" target="_top">Golden Rules</a> for full advice on keeping healthy fish). It is the surface area (length x width) of an aquarium that determines stocking levels, as fish need a certain amount of surface area for enough oxygen to dissolve into the water.</p> <p>As a guide (<em>but see the notes below!</em>), in a coldwater aquarium you should allow:</p> <ul> <li>60 square cm for each 1 cm of fish body length excluding the tail<br> or<br> </li> <li>24 square inches for each 1 inch of fish body length excluding the tail.</li> </ul> <p>For example, in a 60 x 30 cm (24 x 12 inch) tank you can keep a total of 30 cm (12 inches) of combined fish body length, such as three 10 cm-long fishes (three fish each 4 inches long), or two 15 cm-long fishes (two fish each 6 inches long).</p> <p><em>Please note:</em></p> <ul> <li>this rule-of-thumb assumes satisfactory filtration and aeration are provided;</li> <li>some authorities quote 30 square inches for each 1 inch of fish body length instead of 24 square inches;</li> <li>larger fish have a proportionally larger body mass than smaller fish and therefore proportionally larger oxygen needs (e.g. one goldfish 6 inches long has greater oxygen needs than 6 fish each 1 inch long).</li> </ul> <p><em>You should therefore be conservative when deciding upon stocking levels - do not overcrowd your fish, or you will create water quality problems and fish health will suffer.</em></p> <h4>Weight</h4> <p>The weights given are the weight of water only. Please remember to add appropriate amounts for the dry aquarium, the hood, gravel & rocks, internal filtration and the stand in order to find the total weight of an aquarium (for example, when considering where to posttion it).</p> <table border="0" align="center" cellpadding="5" cellspacing="0"> <tr align="center"><td colspan="2"><h3><a name="sa"></a>Surface area and number of fish calculation</h3></td></tr> <form name="form5" method="post" action=""> <tr><td colspan="2" class="box2"><strong>Working in inches</strong></td> </tr> <tr align="right" valign="middle"> <td class="box3">Enter length: <input type="text" size="5" name="lengthIn"> <br> Enter width: <input type="text" size="5" name="widthIn"></td> <td class="box4">Surface area sq in: <input type="text" size="5" name="result" readonly="true"></td> </tr> <tr align="center" valign="middle"> <td colspan="2" class="box6"><input type="button" name="submit" value="Calculate" onclick="surfaceAreaIn()">        <input type="reset" name="clear" value="Clear"></td> </tr> <tr> <td colspan="2" align="right" valign="middle" class="box5">Based on this surface area, you should aim to keep<br> no more than the following total length (inches) of goldfish: <input type="text" size="5" name="result2" readonly="true"></td> </tr> </form> <tr><td colspan="2"> </td></tr> <form name="form6" method="post" action=""> <tr><td colspan="2" class="box2"><strong>Working in centimetres</strong></td> </tr> <tr align="right" valign="middle"> <td class="box3">Enter length: <input type="text" size="5" name="lengthCm"> <br> Enter width: <input type="text" size="5" name="widthCm"></td> <td class="box4">Surface area sq cm: <input type="text" size="5" name="result" readonly="true"></td> </tr> <tr align="center" valign="middle"> <td colspan="2" class="box6"><input type="button" name="submit" value="Calculate" onclick="surfaceAreaCm()">        <input type="reset" name="clear" value="Clear"></td> </tr> <tr> <td colspan="2" align="right" valign="middle" class="box5">Based on this surface area, you should aim to keep<br> no more than the following total length (cm) of goldfish: <input type="text" size="5" name="result2" readonly="true"></td> </tr> </form> <tr align="center"><td colspan="2"><h3><br> <a name="t"></a>Temperature conversion</h3></td></tr> <form name="form1" method="post" action=""> <tr> <td colspan="2" class="box2"><strong>Fahrenheit to Celsius</strong></td> </tr> <tr align="right" valign="middle"> <td class="box3">Enter °F: <input type="text" size="5" name="temperature"></td> <td class="box4">Result °C: <input type="text" size="5" name="result" readonly="true"></td> </tr> <tr align="center" valign="middle" class="box2"> <td colspan="2" class="box5"><input type="button" name="submit" value="Convert" onclick="convertFtoC()">        <input type="reset" name="clear" value="Clear"></td> </tr> </form> <tr><td colspan="2"> </td></tr> <form name="form2" method="post" action=""> <tr><td colspan="2" class="box2"><strong>Celsius to Fahrenheit</strong></td></tr> <tr align="right" valign="middle"> <td class="box3">Enter °C: <input type="text" size="5" name="temperature"></td> <td class="box4">Result °F: <input type="text" size="5" name="result" readonly="true"></td> </tr> <tr align="center" valign="middle"> <td colspan="2" class="box5"><input type="button" name="submit" value="Convert" onclick="convertCtoF()">        <input type="reset" name="clear" value="Clear"></td> </tr> </form> <tr align="center"><td colspan="2"><h3><br> <a name="l"></a>Length conversion</h3></td></tr> <form name="form3" method="post" action=""> <tr><td colspan="2" class="box2"><strong>Inches to centimetres</strong></td></tr> <tr align="right" valign="middle"> <td class="box3">Enter inches: <input type="text" size="5" name="inches"></td> <td class="box4">Result cm: <input type="text" size="5" name="result" readonly="true"></td> </tr> <tr align="center" valign="middle"> <td colspan="2" class="box5"><input type="button" name="submit" value="Convert" onclick="convertItoC()">        <input type="reset" name="clear" value="Clear"></td> </tr> </form> <tr><td colspan="2"> </td></tr> <form name="form4" method="post" action=""> <tr><td colspan="2" class="box2"><strong>Centimetres to inches</strong></td></tr> <tr align="right" valign="middle"> <td class="box3">Enter cm: <input type="text" size="5" name="CM"></td> <td class="box4">Result in: <input type="text" size="5" name="result" readonly="true"></td> </tr> <tr align="center" valign="middle"> <td colspan="2" class="box5"><input type="button" name="submit" value="Convert" onclick="convertCtoI()">        <input type="reset" name="clear" value="Clear"></td> </tr> </form> <tr align="center"><td colspan="2"><h3><br> <a name="vw"></a>Volume and weight calculation</h3></td></tr> <form name="form7" method="post" action=""> <tr><td colspan="2" class="box2"><strong>Working in Imperial measures (inches, gallons & lbs)</strong></td></tr> <tr align="right" valign="middle"> <td class="box3">Enter length: <input type="text" size="5" name="lengthInV"> <br> Enter width: <input type="text" size="5" name="widthInV"> <br> Enter height: <input type="text" size="5" name="heightInV"></td> <td class="box4">Volume in UK gals: <input type="text" size="5" name="result" readonly="true"> <br> Volume in US gals: <input type="text" size="5" name="result3" readonly="true"> <br> Weight in lbs: <input type="text" size="5" name="result2" readonly="true"></td> </tr> <tr align="center" valign="middle"> <td colspan="2" class="box5"><input type="button" name="submit" value="Calculate" onclick="volumeGals()">        <input type="reset" name="clear" value="Clear"></td> </tr> </form> <tr><td colspan="2"> </td></tr> <form name="form8" method="post" action=""> <tr><td colspan="2" class="box2"><strong>Working in metric measures (centimetres, litres & kilos)</strong></td></tr> <tr align="right" valign="middle"> <td class="box3">Enter length: <input type="text" size="5" name="lengthCmV"> <br> Enter width: <input type="text" size="5" name="widthCmV"> <br> Enter height: <input type="text" size="5" name="heightCmV"></td> <td class="box4">Volume in litres: <input type="text" size="5" name="result" readonly="true"> <br> Weight in kilos: <input type="text" size="5" name="result2" readonly="true"></td> </tr> <tr align="center" valign="middle"> <td colspan="2" class="box5"><input type="button" name="submit" value="Calculate" onclick="volumeLitres()">        <input type="reset" name="clear" value="Clear"></td> </tr> </form> <tr align="center"><td colspan="2"><h3><br> <a name="v"></a>Volume conversion</h3></td></tr> <form name="form9" method="post" action=""> <tr><td colspan="2" class="box2"><strong>UK gallons to litres and US gallons </strong></td></tr> <tr align="right" valign="middle"> <td class="box3">Enter UK gals: <input type="text" size="5" name="UKgals"></td> <td class="box4">Result litres: <input type="text" size="5" name="result" readonly="true"> <br> Result US gals: <input type="text" size="5" name="result2" readonly="true"> </td> </tr> <tr align="center" valign="middle"> <td colspan="2" class="box5"><input type="button" name="submit" value="Calculate" onclick="convertUKgals()">        <input type="reset" name="clear" value="Clear"></td> </tr> </form> <tr><td colspan="2"> </td></tr> <form name="form10" method="post" action=""> <tr><td colspan="2" class="box2"><strong>US gallons to Litres and UK gallons</strong></td></tr> <tr align="right" valign="middle"> <td class="box3">Enter US gals: <input type="text" size="5" name="USgals"></td> <td class="box4">Result litres: <input type="text" size="5" name="result" readonly="true"> <br> Result UK gals: <input type="text" size="5" name="result2" readonly="true"> </td> </tr> <tr align="center" valign="middle"> <td colspan="2" class="box5"><input type="button" name="submit" value="Calculate" onclick="convertUSgals()">        <input type="reset" name="clear" value="Clear"></td> </tr> </form> <tr><td colspan="2"> </td></tr> <form name="form11" method="post" action=""> <tr><td colspan="2" class="box2"><strong>Litres to UK gallons and US gallons</strong></td></tr> <tr align="right" valign="middle"> <td class="box3">Enter litres: <input type="text" size="5" name="litres"></td> <td class="box4">Result UK gals: <input type="text" size="5" name="result" readonly="true"> <br> Result US gals: <input type="text" size="5" name="result2" readonly="true"> </td> </tr> <tr align="center" valign="middle"> <td colspan="2" class="box5"><input type="button" name="submit" value="Calculate" onclick="convertLitres()">        <input type="reset" name="clear" value="Clear"></td> </tr> </form> </table> <p>If you do not have a rectangular aquaruim, we regret that this calculator will be of limited use; we may add further functionality in due course.</p> <p align="center">[<a href="info.htm" target="_top">Back</a>]    [<a href="#top">Top</a>]<br>© Bristol Aquarists' Society<br> </p> </body>