March 3, 2021

How to calculate the number of drinks left in your liquor bottle

Want to save money and improve your inventory management process? Use our easy trick (or drinks calculator) that will help you know how many drinks are left!
Bogdan Patynski

 For bar owners and bartenders or even the casual bartender at home who wants to save money and improve their alcohol inventory management process there's an easy trick that will help you know how many drinks are left in your bottle of alcohol!

How to calculate how many ounces of liquor are left in that alcohol bottle?

That is a question bar managers and bartenders often ask themselves when they're trying to figure out just how much inventory they have. The amount of drink left can be difficult to estimate, but there's an easy trick you can use! In this blog post, we will share the secret behind knowing how many drinks are left in a bottle - without even opening it.


The process of estimating how many drinks remain in a liquor bottle is not as complicated as it sounds.


We need to know how many ounces of liquor are in some of the most common bottles there are, which they can then use to make calculations. We do this by dividing the volume of the bottle by one ounce.


Bottle volume ÷ 1 oz = Number of 1-oz servings


Though there are many different alcohol bottle sizes, the 750 mL and 1 L bottles are most commonly used by WISK users. Let's use the 750 mL bottle as example. Yeah it's math. But we're also going to include a calculator at the end of this article so you can rest easy.


A typical drink usually pours 1-ounce the requested spirit. A U.S. Fluid Ounce (oz.) equals 29.57 mL.

Eliminate theft risks by estimating how the remaining alcohol content in a bottle of liquor 

Let’s say your client ordered a margarita. Your drink requires 3 ounces of tequila making it 88.71 mL. But how many portions are in that bottle?


750mL ÷ 1 oz => 750 mL ÷ 29.57 mL = 25.36 1-oz portions


That math suggests there are about 25 1-ounce servings in a 750mL bottle (if you round it down).


If you had a bottle of SAUZA - ANEJO BLACK BARREL, it would cost you $3.99  or $1.33/oz.

A tad expensive for a margarita don't you think? Ideally you want to reduce cocktail costs and increase your menu profitability. WISK can help with that.


How Many Drinks Are Actually in Different Size Alcohol Bottles?


Let's say you have another bottle but in a different format: Montezuma Tequila 1L.


1000mL ÷ 1 oz => 1000 mL ÷ 29.57 mL = 33.81 portions of 1-oz


Your drink costs for 3 oz. would be $0.86 or $0.29/oz.

How to calculate how many shot glasses (1.5-Ounce shots) are left in that alcohol bottle? 

This part is going to be short and sweet.

We know that in a 750 mL bottle there is 25.36 ounces. Since a traditional shot glass(jigger) is 1.5 ounces. We multiply the 29.57 mL we had previously by 1.5. 

29.57 x 1.5 = 44.36 mL

And lastly, 750/44.46 mL = 16.90 shots.

Easy peasy right? No? Well stick with me, i'll make your life easier at the end of this post with a calculator that does the work for you.

Automated bottle costing:

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The only app with a database of 150,000 bottles that calculates what's left in the bottle for you..

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How to measure how many drinks are left in a partially full bottle


Now that you know how many 1-oz servings are in each of your bottles, it’s time to dig a little deeper. How many shots is the bar pouring in each drink? Is the shot size of .5 oz, 2.5 oz, or 5 oz? Whatever the size of the pour, it’s easy to translate that so bartenders can estimate how many drinks are left in a bottle.


Ounces in full bottle × remaining % = Drinks left in partially full bottle


Going back to that margarita, say that I use a 1-oz pour of my tequila, and I have 50% of my 1000ml bottle of tequila ( I have 50% of 33.81 1-oz portions in my bottle):


33.81 servings × 50% = 33.81 × 0.5 = 16.90 1-oz servings left

How to measure a different pour size for different drinks


But what if your cocktail asks for a different amount of spirits? Then we need to know how many servings of that new pour size exist in that bottle. We can find this by dividing the number of remaining 1-oz pours by the new pour size (in ounces):


Number of 1-oz servings ÷ new pour size in ounces = Portions of new pour size


Let’s take a 3-oz pour as the example. After measuring with your scale, WISK shows you that you have 17.27 1-oz portions of liquor left. I just need to divide that by my 3-oz base pour to figure out how many drinks of the new-sized pour remain:

17.27 1-oz portions ÷ 3 oz = 5.76 3-oz servings


In this case, I have about full drink pours left in that liquor bottle.


Conversion calculator for drink measuring

Using a calculator, it's easy to figure out the number of drinks left in different types of bottles. This helps bartenders better stock their bars before shifts and check what they have properly throughout the week, at which point you can increase your business overall profits.


Oz. in bottle calculator

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Taking inventory should not take hours.