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**Education Calculators** ▶ Percent Yield Calculator

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The percent yield calculator is a fast tool that helps you to calculate percent yield value by adding theoretical yield and actual yield value. You can readily perform the percent yield calculation by using this yield percentage calculator or percent yield formula.

However, chemists should be concerned with how completely their reactants are reacting to form products. Especially, calculating percent yield is important in terms of synthetic lab work and other chemistry-related processes.

Well, before knowing about this yield calculator of chemistry and how to calculate percent yield, let’s start with the percent yield definition in chemistry!

By the definition of percentage yield in chemistry, percent yield is said to be percent ratio of actual yield to the theoretical yield. You can calculate percent yield by using the simple percent yield equation. Remember that if the actual and theoretical yield both is the same, then the percent yield is 100%. Typically, percent yield is lower than 100% because the actual yield is often less than the theoretical value. Reasons behind this include incomplete or competing reactions and also loss of sample during recovery. However, it is possible for percentage or % yield to be over 100% that is referred to as more sample was recovered from a reaction than predicted. Usually, this can take place when other reactions were occurring that also formed the product. Also, it can be a source of error if the excess is because of incomplete removal of other impurities or water from the sample.

Keep in mind, percent yield is always a positive value. Sometimes, percent yield is also referred to as ‘Percentage Yield.’ Well, let’s take a look at the percent yield equation:

The percent yield formula is taken into account to find out the % yield value. The Percentage yield is determined by divide the actual yield with the theoretical yield and multiplied by 100%. The percent yield equation is given below:

percent yield = (actual yield/theoretical yield) x 100%

**Where**:

- Actual yield is said to be the amount of product obtained from a chemical reaction
- Theoretical yield is said to be the amount of product obtained from the stoichiometric or balanced equation by using the limiting reactant to determine product

The above percent yield formula requires you to provide two of the three variables, but it does not matter which two! Like any equation, this percent yield equation can be rearranged to find the unknown, but when using our percent yield calculator there is a no need to worry about this.

**Note**:

To use this percentage yield formula, you have to make sure that your actual yield and theoretical yield both are in the same units. Means, if you provide actual yield in grams, then the theoretical yield also needs to be in grams. And, if theoretical yields provided in moles, then the actual yield also needs to be in moles. But, you no need to do so, our smart calculator will do it on the back-end, means you no need to select the same unit for both actual and theoretical yield.

This percentage yield calculator is helps you to calculate percent yield, actual yield, and theoretical yield for the given parameters. There is a no need to stick to lengthy calculations, simply put the values into this online percent yield calculator to find the value according to given inputs.

This percentage (%) yield calculator is loaded with a user-friendly interface, you have to stick to the given steps to find percent yield, actual yield, and theoretical yield:

**Inputs:**

- First of all, you have to select the ‘percent yield’ option from the drop-down menu of the above calculator
- Right after, you have to add the value of ‘theoretical yield’ into the designated field and select the unit from-drop down menu, it can either be in ‘µg, mg, g, kg, lbs’
- Then, you have to add the value of ‘actual yield’ into the designated box, and then select the unit from a drop-down menu, it can either be in ‘µg, mg, g, kg, lbs’

**Result:**

- Once you added the above values, then hit the calculate button, the calculator shows the percent yield value

**Inputs:**

- First, you ought to select the ‘theoretical yield’ option from the drop-down menu
- Very next, you ought to add the value of ‘percent yield’ into the designated field
- Now, you ought to enter the value of ‘actual yield’ into the designated field of the above calculator

**Result:**

- Once you entered all the above values, hit the calculate button, the calculator shows the theoretical yield value that you obtained from the stoichiometry percent yield

**Inputs:**

- At first, you have to select the ‘actual yield’ option from the drop-down menu
- Then, you have to enter the value of ‘percent yield’ into the designated box
- Finally, you have to enter the value of ‘theoretical yield’ into the designated field, and choose the unit from drop-down menu, it can either be in ‘µg, mg, g, kg, lbs’

**Result:**

- Once you entered all-above values, simply hit the calculate button, percent yield calculator calculate the value of actual yield

Let’s elaborate it with an example:

If the theoretical yield is 19 grams, and (MgCO3) Magnesium carbonate decomposed to form 15 grams of MgO in the actual experiment, then what is the percent field of MgO?

MgCO3 →MgO + CO2

In this example of percent yield, you ought to calculate the percent yield of magnesium oxide. To find percent yield, you ought to know the actual and theoretical yields of magnesium oxide. Well, both these values are given above:

Actual Yield = 15

Theoretical Yield = 19

Percent Yield =?

So, all you need to put the values into the percent yield formula:

The percent yield equation is:

percent yield = (actual yield/theoretical yield) x 100%

percent yield = (15 g MgO/19 g MgO) x 100% = 79 %

So, the percent yield of magnesium oxide = 79 %

The actual yield is said to be the quantity of a product that is obtained from a chemical reaction. Studies reported that that theoretical or calculated yield is said to be the amount of product, which could be obtained from a reaction if all the reactant converted to product. Remember that theoretical yield depends on the limiting reactant.

Typically, a reaction is given a maximum percentage yield; as the name reveals, this is said to be the highest percentage of theoretical product that can practically be obtained. A reaction yield of 90 percent of the theoretical possible would be considered excellent. And, 80% yield would be very good. Also, a yield of 50% is considered adequate.

Usually, percent yields are understandably less than 100% as we discussed above. However, percent yields can be greater than 100% if the measured product of the reaction has impurities that cause its mass to be greater than it actually would be if the product was pure.

Studies depict that the yield and rate of a chemical reaction based on conditions like temperature and pressure.

In industry, chemical engineers specifically design processes that maximize the yield and even the rate at which the product is produced. Also, they aim to reduce waste and even energy costs at all stages of the process.

However, data on yields and even the rate of reaction assists to select reaction conditions, which make the process as safe as efficient as possible.

Remember that reversible reactions in closes systems do not reach 100 percent yield. This is the basic problem in an industrial process which needs a high percentage yield.

If the reactants do not completely form the products, the percentage yield is decreased. If you want to make a given mass of the product, then a process with a low % yield needs more of the reactants than a process with high % yield.

Additionally, there is a need to separate out the desired product from a mixture, even also that has some of the original reactants. Remember that extra stages in a process cost money.

Percent yield is said to be very important in the manufacture of products. Even lots of time and money are spent to improving the percent yield for chemical production. However, when a complex amount of chemicals are synthesized by many different reactions, one step with a low % yield can quickly occur a large waste of reactants and unnecessary expense.

According to optimistic studies:

- A higher percent yield might indicate that your product is being contaminated by excess reactant, water, or other substances
- A lower percent yield might indicate that you spilled a portion of your product – or mismeasured a reactant

Percent yield is said to be a useful way that indicated how much of a reactant has been successfully converted to a product in a chemical reaction. Remember that if none of the reactants ends up as products, then the percentage yield is said to 0%.

Thankfully, you come to know the basics of percent yield calculation, account the above percent yield calculator to perform percent yield, actual yield, and theoretical yield calculations – Good Luck!

From the source of Study – College Chemistry: Tutoring Solution/Science Courses – percent yield formula example

The source of wikihow provided: Education about Chemistry Solutions – how to calculate percent yield in chemistry

From Wikipedia, the free encyclopedia – percentage yield (or fractional yield or relative yield) in chemical reactions

By Opentextbc – Chapter 4: Stoichiometry of Chemical Reactions – Reaction Yields – Calculate the percent yield for a reaction