Corrected Specific Gravity
1.0538
+0.0018 from measured (1.052)
Formula: CG = MG × f(ST) / f(CT), where f(T) is the standard brewing temperature correction polynomial. This is the brewing industry's established standard correction method — widely used by professional and homebrewing references.
Correct your hydrometer reading for sample temperature. Enter your measured gravity, the actual sample temperature, and your hydrometer's calibration temperature to get an accurate specific gravity. Supports 59°F (15°C) and 68°F (20°C) calibration presets. All calculations run in your browser — no login, no uploads.
A hydrometer is manufactured to be accurate at a specific calibration temperature — typically 59°F (15°C) or 68°F (20°C). When your sample temperature differs from that reference, the density of water itself has changed, causing the raw reading to drift from the true specific gravity. This tool applies the brewing industry's established standard correction polynomial to give you an accurate reading. Corrected gravity is essential for accurately tracking fermentation progress and calculating alcohol by volume (ABV).
Example: Measured gravity 1.052, sample temperature 75°F (23.9°C), calibration temperature 60°F (15.6°C)
• Correction factor f(75°F) = 1.00130346 − 0.000134722124 × 75 + ... ≈ 1.001695
• Correction factor f(60°F) ≈ 1.000063
• Corrected gravity CG = 1.052 × (1.001695 / 1.000063) ≈ 1.0537
• Delta from measured: +0.0017 (the sample was warmer than calibration, so the true gravity is slightly higher than the raw reading)
When the sample is warmer than the calibration temperature, the corrected value will be higher than the measured reading. When the sample is cooler, the corrected value will be lower.