How To Check Alcohol Percentage?

How To Check Alcohol Percentage
Formula for Calculating Alcohol in Beer

  1. Subtract the Original Gravity from the Final Gravity.
  2. Multiply this number by 131.25.
  3. The resulting number is your alcohol percent, or ABV%

How do you calculate alcohol percentage?

Step 4: Calculation – Now, it’s time to turn the specific gravity readings into a useful number. For an approximate estimation, the magic number is 131.25. Your percent alcohol can be given by the formula: ABV(%) = (Initial Gravity – Final Gravity) * 131.25.

So if your initial gravity was 1.108, and your final gravity was 1.041, your beer is approximately 8.79% alcohol by volume. Once again, this is only an approximation, and loses accuracy as the alcohol content goes up. For a more precise number, or if you’re brewing something particularly strong, there exist a number of online calculators that can do the heavy lifting for you.

Thanks for reading, brew and enjoy responsibly!

How can I check my alcohol percentage at home?

All we need is a digital thermometer (accuracy 0.1OC or higher). Measure the difference in boiling point of wine (or beer) as compared to that of deionized water. Higher the alcohol content, lower the boiling point is. Use a degree ebulliometer reference table to compute the alcohol percentage.

How much is 5% of alcohol?

The ABV will tell you how many ounces of actual alcohol are in the beverage. For example, if a 12-ounce bottle of beer is 5.0 percent alcohol, that means that the bottle has 0.6 ounces of pure alcohol.

How strong is 12.5 alcohol?

Here are some examples of a Standard Drink: –

A pub measure of spirits (35.5ml) A small glass of wine (12.5% volume) A half pint of normal beer An alcopop (275ml bottle)

A bottle of wine at 12.5% alcohol contains about seven Standard Drinks. A Standard Drink is a drink that contains 10g of pure alcohol. (10g is the weight of about 12.7 ml of pure alcohol) In Ireland at present, bottles and cans do not indicate the number of Standard Drinks they contain.

How can I measure alcohol percentage without a hydrometer?

Download Article Download Article Testing for alcohol content is an important part of home-brewing to determine the potency of your drinks. While most people will use a hydrometer to check the alcohol levels, you can also use a refractometer, which measures how light bends through a liquid to determine the density.

  1. 1 Buy a refractometer online to measure alcohol content. Refractometers are cylindrical devices that measure the concentration of sugar in water based on how light refracts through the solution. Look at home-brewing websites to see what refractometers they have available to purchase.
    • Refractometers usually cost $30 USD or more. More expensive models tend to be more accurate than cheaper ones.
    • You may be able to find refractometers in specialty home-brewing stores.
    • In order to use a refractometer to measure alcohol content, you need to take a measurement before it begins fermenting. You will not be able to measure alcohol content in a drink otherwise.
  2. 2 Put 2–3 drops of distilled water on the refractometer’s glass and shut the lid. Flip open the plastic cap on the end of the refractometer to expose the glass underneath. Use a pipette to apply a few drops of distilled water on top of the glass, making sure they don’t run off. Flip the plastic lid closed so it spreads the water evenly over the surface.
    • Avoid using water from a sink since it may have additives that could affect your reading.


  3. 3 Hold the refractometer up to your eye so it points at a light source. Put the refractometer’s lens against your eye and point the other end with the glass toward a light, such as a lamp or ceiling light. As you look through the lens, you will see a scale of numbers ascending vertically and the background will have a white section near the bottom and a blue section above it.
    • The horizontal line that splits the blue section and the white section in the background is the hydrometer reading.
    • If you have a digital refractometer, it will have a light built into the body so you don’t need an external light source.

    Tip: If you can’t read the numbers on the scales, rotate the eyepiece to focus the image.

  4. 4 Adjust the calibration screw if you don’t have a 0 reading on the scale. Check where the horizontal line crosses the scales. If it doesn’t line up with the 0 mark on either scale, locate the calibration screw on the top of the refractometer. Use a screwdriver to turn the screw counterclockwise if the line is above the 0 mark or clockwise if the line is above it.
    • The calibration screw may be covered by a plastic cap so you don’t accidentally rotate it while using the refractometer.
    • The refractometer may already come with a screwdriver.
  5. 5 Wipe the glass dry to prevent damage. Flip the lid open on the refractometer and use a lint-free microfiber towel to dry off the glass. If you aren’t able to clean off all the water with the towel, leave the lid open and allow the refractometer to air dry so it doesn’t affect future readings.
    • Avoid leaving water or moisture on the refractometer since it could leak into the machine and make it inaccurate in future readings.
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  1. 1 Put 2–3 drops of the unfermented sample on the refractometer. Use the sugar and water starter liquid, or wort, you’re using for your homebrew and pull a small sample into a pipette. Open the plastic lid on the refractometer and apply 2–3 drops across the glass. Close the lid to help spread out the drops into a thin, even layer.
    • Refractometers work best for measuring alcohol in home-brewed beer or whiskey.
    • You can try using a refractometer to measure must, which is crushed fruit used for wine, but you may not get as accurate of a reading.

    Tip: Many refractometers automatically adjust for temperature, but if your model doesn’t, wait until the unfermented sample reaches room temperature before taking your measurement. If you don’t, you may get an inaccurate reading.

  2. 2 Hold the refractometer up to a light to find the Brix gravity reading. Place the refractometer’s lens against your eye and point the glass toward a light source. Rotate the lens to adjust the focus if you’re not able to see the scales clearly. Look at the scale labeled “Brix %” and note where the horizontal line crosses it. Write down the reading so you don’t forget it later on.
    • The Brix scale usually goes from 0 to 30%, but it may vary depending on the model of your refractometer.
    • You do not need to use the side labeled “SG” or “Specific Gravity” since it will be more difficult to convert later on.
  3. 3 Take another Brix reading 2–3 weeks after the liquid starts fermenting. Wait until the solution or wort begins fermenting before taking your next measurement, or else you won’t be able to get an accurate measurement. Place another 2–3 drops of the wort onto the refractometer’s glass and close the lid.
    • You can take your second reading at any point during the fermentation process.
  4. 4 Divide both of your readings by 1.04 to correct them. Since refractometers have slight inaccuracies to them, take the readings you found and divide them by 1.04, which is the standard correction value. Write down the final results you found out rounded to the second decimal place so you have the initial and final Brix percent measurements.
    • For example, if the initial Brix percentage was 12 on the refractometer, the equation would be: 12/1.04 = 11.54.
    • If you found the final Brix percentage was 8, then your equation would be: 8/1.04 = 7.69.
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  1. 1 Plug the readings into the correction formula for the final specific gravity. Use the formula: 1.0000 – (0.0044993 * IB) + (0.011774 * FB) + (0.00027581 * IB²) – (0.0012717 * FB²) – (0.0000072800 * IB³) + (0.000063293 * FB³), where IB is the corrected initial Brix measurement and FB is the corrected final Brix measurement.
    • For example, if the corrected initial Brix percentage was 11.54 and the corrected final percentage was 7.69, the equation would be: 1.0000 – (0.0044993 * 11.54) + (0.011774 * 7.69) + (0.00027581 * (11.54²)) – (0.0012717 * (7.69²)) – (0.0000072800 * (11.54³)) + (0.000063293 * (7.69³)).
    • After plugging the equation into a calculator, the final specific gravity would be 1.018.
  2. 2 Convert the first Brix reading with (IB / ) + 1. Plug the corrected initial Brix percentage into the equation in place of IB and enter the formula into your calculator. Round your answer to the third decimal point to find the initial specific gravity, which you can use to find the alcohol content of the wort.
    • For example, if the first Brix percentage was 11.54, the equation would read: (11.54 / ) + 1.
    • When you plug the equation into a calculator, you would find the initial specific gravity is 1.046.
  3. 3 Use (76.08 * / ) * (FG / 0.794) to find the alcohol content. Plug the initial specific gravity you just calculated in for IG and the final specific gravity you found earlier in place of FG. Type the equation into a calculator and round the answer to the third decimal point to find the expected alcohol content of the wort once it’s completely fermented.
    • For example, if the initial specific gravity was 1.046 and the final specific gravity was 1.018, then the equation would read: (76.08 * / ) * (1.018 / 0.794).
    • After putting the formula into a calculator, your result would be 3.747, which means the drink will be 3.747% alcohol by volume, which is how much alcohol is contained in 100 millilitres (3.4 fl oz).
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Unlike a hydrometer, you cannot use a refractometer to test alcohol content if you don’t know the initial gravity before the liquid ferments.


  • Refractometer
  • Pipette
  • Distilled water
  • Screwdriver
  • Microfiber cloth
  • Calculator

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Is there an app to check alcohol level?

What are the benefits of the MyDrinkaware app? –

The MyDrinkaware app for Android and Apple is an easy way to keep track of both the units and the calories in your alcoholic drinks. The app helps you measure your drinking accurately and find your drinks with ease. You can find information and personalised stats to motivate you on your journey. The MyDrinkaware app helps you to review your drinking patterns and to set your own goals. Most importantly, the app is always on hand, at the times and places you need it the most.

How do you test for 70% alcohol?

4 Ways on how to check if your online bought alcohol is safe August 21, 2020 Coronavirus (CoVid-19) hit the world by surprise this 2020 and changed the way consumers behave. Since the beginning of 2020, in order to slow down the spread of CoVid-19 and to prevent contracting CoVid-19, countless of people have been desperately looking for 70 percent Isopropyl alcohol on the internet.

Consequently, many online sellers are now taking advantage of the situation by either: selling a low-grade (industrial grade) alcohol and advertising it as medical-grade; or selling an alcohol at a concentration lower than indicated (e.g. selling an alcohol as 70 percent even if it is only 30 percent in concentration).

Here are several foolproof tips to ensure you get an authentic 70% Rubbing Alcohol: 1. Ask the seller for certificate of analysis to verify the alcohol content.

Check for the laboratory who conducted the test and do google search if the laboratory is FDA accredited. Check the PRC license of the chemist. See below for reference.

How To Check Alcohol Percentage 2. Ask the seller for FDA product notification to verify if the 70 percent Isopropyl Alcohol you bought online has passed the standards of FDA.

Verify if the FDA product notification is not counterfeit by going to the FDA website: You might also want to check FDA website to see if the 70 percent Alcohol you bought online is on the list of their approved brand of 70 percent alcohol.

How To Check Alcohol Percentage 3. Test the physical and chemical properties of the alcohol that you bought.

Do a flame test by getting small sample of the alcohol, set it aflame. Flame will be yellowish orange for Isopropyl alcohol (Bluish if ethyl alcohol.) If it does not set ablaze then your purchased alcohol might have been a counterfeit product. Smell the scent of the alcohol. Isopropyl alcohol usually smells like your typical rubbing alcohol or hospital smell. If it smells like acetone or paint thinner, you likely bought a fake product online.

4. If you are really suspicious on the product that you are about to buy. Search up the company of the alcohol brand that you are about to buy on facebook or google and call their office to verify if it is really original. → : 4 Ways on how to check if your online bought alcohol is safe

Is 15% alcohol strong?

The alcohol content in beer, wine and malt beverages is below 15% ABV. However, hard alcohol or spirits are above 15% ABV (30 proof). Most of the severe injuries and deaths correlated with alcohol use are related to consuming ‘hard alcohol.’

Is 0.5 drunk?

You can’t get drunk on 0.5% drinks In fact, the amount of alcohol in 0.5% drinks is so small that it’s impossible to get anywhere near drunk on 0.5% drinks, no matter how many you have.

How much alcohol is in beer?

What Is A Standard Drink? Many people are surprised to learn what counts as a drink. The amount of liquid in your glass, can, or bottle does not necessarily match up to how much alcohol is actually in your drink. Different types of beer, wine, or malt liquor can have very different amounts of alcohol content.

Regular beer: 5% alcohol content Some light beers: 4.2% alcohol content

That’s why it’s important to know how much alcohol your drink contains. In the United States, one “standard” drink (or one alcoholic drink equivalent) contains roughly 14 grams of pure alcohol, which is found in:

12 ounces of regular beer, which is usually about 5% alcohol 5 ounces of wine, which is typically about 12% alcohol 1.5 ounces of distilled spirits, which is about 40% alcohol

How do you know how much alcohol is in your drink? Even though they come in different sizes, the drinks below are each examples of one standard drink : Each beverage portrayed above represents one standard drink (or one alcoholic drink equivalent), defined in the United States as any beverage containing 0.6 fl oz or 14 grams of pure alcohol.

How accurate is alcohol tester?

The Margin of Error on BAC Testing – There is indeed a margin of error when it comes to Breathalyzers. This margin of error can be up to 15%. Around 20% of people charged with a DUI can end up being victims and an inaccurate Breathalyzer test. The best and most accurate way to accurately test a person’s BAC is by doing a blood test.

How accurate is alcohol meter?

You are here: Home / White Papers / Measuring Alcohol Concentration – Alcohol Proof Testing Alcohol Concentration Determination Introduction – Pycnometers, hydrometers, and digital density meters are officially recognized methods for the determination / measuring alcohol proof (ethanol) concentration for quality control and to insure proper product labeling for declaration of alcohol proof testing for the payment of tax.

What is alcohol 70% formula?

Molecular formula C2H5OH. Appearance Clear, colorless liquid. Molecular weight 46.07. Odor Alcohol.

What is the formula of 95% alcohol?

Ethyl Alcohol, 95%, 30 ml

Formula CH 3 CH 2 OH or C 2 H 5 OH
Formula Weight Mixture
Boiling Point 165.2 to 176 degrees F
Melting Point -173 degrees F
Form Solution