Hydrometer Correction Calculator
Correct your hydrometer reading for temperature. Most hydrometers are calibrated at 60°F (15.5°C) — enter your sample and calibration temperatures to get the true gravity.
Correct hydrometer readings for sample temperature
Hydrometers are calibrated for a specific temperature. Use this calculator to adjust a gravity reading when your wort or beer sample is warmer or cooler than the calibration point.
Example hydrometer correction
If a hydrometer calibrated at 68 F reads 1.020 in an 80 F sample, enter the reading, sample temperature, and calibration temperature to estimate the corrected gravity.
- Enter the observed hydrometer reading, such as 1.020.
- Enter the sample temperature and your hydrometer calibration temperature.
- Use the corrected gravity in ABV or fermentation tracking calculations.
Watch for: Correction helps, but cooling a sample near the calibration temperature is still the cleaner measurement habit.
Frequently asked questions
Why correct a hydrometer reading?
Liquid density changes with temperature, so readings away from the hydrometer calibration temperature can be slightly off.
What calibration temperature should I enter?
Use the calibration temperature printed on your hydrometer or its instructions. Common values are 60 F and 68 F.
Should I cool the sample instead?
Cooling close to calibration temperature is best when practical, but correction helps when you need a quick reading.
Can I use the corrected value for ABV?
Yes. Use corrected OG and FG readings in the ABV calculator for a better alcohol estimate.
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