Gravity Correction Calculator

Formula

To calculate the Corrected Gravity (\(CG\)):

\[ CG = OG + \left(\frac{CF \times (T - CT)}{1 + 0.004 \times OG}\right) \]

Where:

\(CG\) is the corrected gravity (°Plato)
\(OG\) is the observed gravity (°Plato)
\(CF\) is the correction factor (1.313452 for Plato scale)
\(T\) is the temperature at which the gravity is observed (°C)
\(CT\) is the calibration temperature (°C)

What is Gravity Correction?

Gravity correction is the process of adjusting the gravity reading of a liquid to account for temperature differences from the calibration standard. This is important in industries such as brewing, where the sugar content of a liquid is measured using a hydrometer or refractometer at a specific calibration temperature, typically 20°C. Since the density of a liquid changes with temperature, the observed gravity must be corrected to ensure accurate readings.

Example Calculation 1

Let's assume the following values:

Observed Gravity (\(OG\)) = 12 °Plato
Correction Factor (\(CF\)) = 1.313452
Temperature at Observation (\(T\)) = 25 °C
Calibration Temperature (\(CT\)) = 20 °C

Using the formula:

\[ CG = 12 + \left(\frac{1.313452 \times (25 - 20)}{1 + 0.004 \times 12}\right) = 18.27 \text{ °Plato} \]

The corrected gravity is 18.27 °Plato.

Example Calculation 2

Let's assume the following values:

Observed Gravity (\(OG\)) = 15 °Plato
Correction Factor (\(CF\)) = 1.313452
Temperature at Observation (\(T\)) = 30 °C
Calibration Temperature (\(CT\)) = 20 °C

Using the formula:

\[ CG = 15 + \left(\frac{1.313452 \times (30 - 20)}{1 + 0.004 \times 15}\right) = 27.39\text{ °Plato} \]

The corrected gravity is 27.39 °Plato.