Update - October 2012
A browser cookie will now save your hydrometer calibration between visits (but if you clear your cache it disappears).

Update - August 2012
This calculator now supports different hydrometer calibrations. Look on your hydrometer (or its instructions) and it should tell you. Old hydrometers are calibrated to (59° F / 15° C) and newer ones are typically (68° F / 20° C).

The temperature range has been increased to 32-159 °F, 0-71 °C.

Please be careful when handling hot wort! We recommend letting the sample cool to below 100F / 38C before handling. Cracked glassware is a bummer...

NEXT: To calculate your batch's bitterness in the home brewing standard international bittering units (IBUs), see our IBU calculator.