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FOC Calculator + Online Solver With Free Steps

The online FOC Calculator is a calculator that allows you to find the front-of-center value of an arrow.

The FOC Calculator calculator is a powerful tool that archers use to find the perfect front-of-center value according to their situation.

What Is a FOC Calculator?

A FOC Calculator is an online calculator that helps archers calculate the front-of-center value of their arrows.

The FOC Calculator requires two inputs to calculate the FOC value: the length of the arrow and the Nock to Balance Point length.

After inputting the values in the FOC Calculator, the calculator quickly finds the FOC value of the arrow.

How To Use a FOC Calculator?

To use the FOC Calculator, enter the calculator’s inputs and click the “Submit” button. The calculator will display the results then.

The detailed instructions for using the FOC Calculators are given below:

Step 1

In the initial step, we first enter the length of the arrow into the FOC Calculator.

Step 2

After entering the length of the arrow, we enter the Nock to Balance Point length of the arrow into the FOC Calculator.

Step 3

Once both the inputs are entered in the FOC Calculator, we click the “Submit” button. The FOC Calculator calculates the results and displays them below the calculator.

How Does a FOC Calculator Work?

The FOC Calculator works by taking in the inputs and applying the formula to calculate the front-of-center value of an arrow. The formula to calculate the FOC values is shown below:

\[ \text{F.O.C value} = \frac{\frac{A-L}{2}}{L} \times 100% \]

What Is a FOC Value?

FOC value is the abbreviation for front-of-center value. It refers to the proportion of the arrow’s overall weight in the front half. 

Arrow performance will increase with a perfect FOC percentage, and accuracy will increase. A high FOC percentage will aid penetration in addition to improving accuracy. The initial wallop is more significant with more of the arrow’s weight in the front half.

The challenge is determining the proper FOC percentage. The weight in the arrow’s front end will swiftly bring it down if the FOC is too high. You will slow down, and accuracy problems will arise due to the arrow’s rapid loss of trajectory. To many, this is a major turnoff.

Some shooters worry that losing too much velocity may decrease their range. False. Speed and trajectory loss are barely noticeable if FOC is computed correctly.

When you shoot an arrow with a low FOC, the arrow will fly erratically. There will be significant left and right difficulties due to the shaft carrying too much weight in the backend, causing penetration issues. 

This is a significant factor in why folks who only shoot from 40 yards and closer when bowhunting still need to be concerned about FOC. While hunting, a perfect FOC percentage will result in more shots that cause blood to seep from both sides because the aim is always a pass-through.

Your objective is to shoot an arrow with a FOC of 11 and 15 percent. This will guarantee pinpoint accuracy at greater distances and is suitable for hunting setups.

How To Calculate the FOC Value?

To calculate the FOC value, you must ensure that the broadhead, vanes, nock, and insert on your arrow will be used for shooting. You then assemble your arrow usually.

Once the arrow is assembled, measure it from the end of the shaft’s bottom to the nock groove with a tape measure and divide by two. On the stick, make a mark there. 

Next, locate the arrow’s equilibrium point. The arrow will balance properly at this location without leaning over the edge. Once more, measure the distance between the two shaft markings.

Next, divide the distance between the two marks by the overall length of the arrow. The final step is multiplying this number by $100$ to find the FOC percentage.

Solved Examples

The FOC Calculator allows you to calculate the front-of-center value of an arrow instantly by utilizing the arrow’s length and Nock to Balance Point length of the arrow.

Here are some examples solved using the FOC Calculator:

Example 1

A hunter needs to buy some arrows before going out for a hunt. He purchases a box of arrows with a length of 30 inches and a notch to balance point length of 20 inches. Using the FOC Calculator, find the FOC values of the arrows.

Solution

Using the FOC Calculator to find the FOC value is very easy. First, we enter the length of the arrow into our FOC Calculator; the arrow size is 30 inches. After entering the length of the arrow, we enter the notch to balance point length of the arrow into the FOC Calculator; the distance between the balance point and notch is 20 inches.

Once all the inputs are entered in the FOC Calculator, we click the “Submit” button. The FOC Calculator quickly computes the FOC value and displays them in a separate window.

The following results are extracted using the FOC Calculator:

Input:

\[ \frac{20}{30}-0.5 \]

Results:

FOC value = 0.1666…

Example 2

While training for a tournament, a professional archer must ensure that his arrows’ FOC value is ideal. The length of the arrow is 32 inches, and the distance between the notch and the balancing point is 25. Using the FOC Calculator, find the FOC value of the arrows.

Solution

With the help of the FOC Calculator, we can quickly figure out the FOC value of the arrow. Initially, we add the length of the arrow into the FOC Calculator; the length of the arrow is 32 inches. After you add the length of the arrow, you enter the distance between the notch and the balancing point into the FOC Calculator; the distance between the notch and the balancing point is 25 inches. 

Finally, when all the inputs have been credited into the calculator, we click the “Submit” button. The calculator quickly computes the result and displays the results in a new window.

The following results are taken from the FOC Calculator:

Input:

\[ \frac{25}{32}-0.5 \]

Results:

FOC value = 0.28125… 

Example 3

A university archery team is given arrows to practice for a state tournament. The university provides the team with arrows with a length of 35, and the distance between the notch and balancing point is 20. Using the FOC Calculator find the FOC value of the arrow.

Solution

We can rapidly get the FOC value of the arrow by using the FOC Calculator. First, we enter the length of the arrow into the FOC Calculator; the arrow’s length is 35 inches. You enter the distance between the notch and the balancing point into the FOC Calculator after adding the length of the arrow; the distance between the notch and the balancing point is 20 inches.

After all the inputs have been entered into the calculator, we press the “Submit” button. The calculator computes the value rapidly and shows it in a new window.

The FOC Calculator yielded the following results:

Input: 

\[ \frac{35}{20}-0.5 \]

Results:

 FOC value = 0.0714285…

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