The ABV Calculator estimates the resulting alcohol by volume from original and final gravity values.

The calculator uses the simple conversion formula:

Note that due to the manner in which the RAPT Portal calculator handles rounding of decimals, the calculated gravity may differ from this calculator

The RAPT platform offers some manual calculation and conversion tools that are handy on your brew day.

• ABV Calculator

• Colour Converter

• Wort Dilution Calculator

The Wort Dilution Calculator allows you to determine:

• desired volume and resulting gravity

• a desired gravity after a calculated water addition

Diluting to a Target Gravity

1. Enter the current volume and gravity of the wort.

2. Enter the desired target gravity of the wort.

3. The calculator will determine the required water addition to achieve the desired gravity.

Diluting to a Target Volume

1. Enter the current volume and gravity of the wort.

2. Enter the desired target volume of the wort.

3. The calculator will determine the original gravity after the dilution.

The Hydrometer Temperature Adjustment Calculator allows you to adjust hydrometer readings based on the temperature of the sample.

Liquids expand and contract at different temperatures, meaning the liquid can become more or less dense. Hydrometer readings are based on the gravity of the liquid which is directly affected by the density of the liquid, and thus can be incorrect depending on the temperature the hydrometer was calibrated at, and the temperature at which the measurement was taken.

A simple formula is used to allow for compensation at different temperatures.

To make a measurement adjustment

1. Select your measurement unit (standard gravity, brix)

2. Enter the hydrometer reading

3. Enter the measurement temperature

4. Enter the original calibration temperature

5. Optionally provide an offset if you have performed a custom calibration

6. The adjusted value will be calculated

NOTE: The RAPT Pill Hydrometer and Thermometer measuires Specific Gravity by angle. It is not affected by temperature i the same manner as a traditional glass tube tpye of floating hydrometer - thus, this calculator is not accurate for the Pill

The Colour Converter tool provides simple conversion between SRM, EBC, and Lovibond values.

Enter a value into any field and the converter will provide the values for the other unit types.