Use this free NFL Interception Percentage Calculator to calculate interception percentage from interceptions thrown and passing attempts. Enter the two statistics to instantly calculate INT%.
What Is Interception Percentage?
Interception Percentage (INT%) measures the percentage of a quarterback's passing attempts that result in interceptions.
The calculation divides interceptions thrown by total passing attempts and multiplies the result by 100.
For example, if a quarterback throws 2 interceptions on 35 passing attempts:
2 ÷ 35 × 100 = 5.71%
The quarterback's interception percentage is 5.71%.
Interception Percentage Formula
The basic formula is:
Interception Percentage = (Interceptions ÷ Passing Attempts) × 100
For example:
(3 ÷ 50) × 100 = 6.00%
A quarterback with 3 interceptions on 50 passing attempts has an interception percentage of 6.00%.
How to Calculate Interception Percentage
You need two statistics to calculate interception percentage:
- Interceptions — the total number of interceptions thrown.
- Passing attempts — the total number of passing attempts.
Follow these steps:
- Enter the number of interceptions thrown.
- Enter the number of passing attempts.
- Divide interceptions by passing attempts.
- Multiply the result by 100.
- Round the result to the desired number of decimal places.
Interception Percentage Example
Suppose a quarterback records:
- 4 interceptions
- 40 passing attempts
Apply the formula:
(4 ÷ 40) × 100 = 10.00%
The quarterback's interception percentage is 10.00%.
Interception Percentage Examples
| Interceptions | Passing Attempts | Interception Percentage |
|---|---|---|
| 2 | 35 | 5.71% |
| 3 | 50 | 6.00% |
| 4 | 40 | 10.00% |
| 1 | 30 | 3.33% |
| 5 | 60 | 8.33% |
What Does Interception Percentage Mean?
Interception percentage represents the proportion of passing attempts that resulted in interceptions.
For example, an interception percentage of 3.00% means that interceptions occurred on approximately 3 out of every 100 passing attempts based on the calculated rate.
It is a rate statistic, not the total number of interceptions.
Why Is Interception Percentage Used?
Interception percentage is one statistic used to describe interceptions relative to passing attempts.
It provides additional context when comparing interception totals for players with different numbers of passing attempts.
However, interception percentage represents only one aspect of passing statistics and does not describe every part of quarterback performance.
Interception Percentage vs. Interceptions
Interceptions are the total number of interceptions thrown, while interception percentage expresses interceptions relative to passing attempts.
For example:
- Quarterback A: 10 interceptions on 400 attempts = 2.50%
- Quarterback B: 10 interceptions on 500 attempts = 2.00%
Both quarterbacks have 10 interceptions, but their interception percentages are different because their passing-attempt totals are different.
Interception Percentage vs. Completion Percentage
Interception percentage and completion percentage both use passing attempts as the denominator but measure different outcomes.
Completion percentage:
(Completions ÷ Passing Attempts) × 100
Interception percentage:
(Interceptions ÷ Passing Attempts) × 100
Completion percentage measures the percentage of attempts resulting in completions, while interception percentage measures the percentage resulting in interceptions.
Interception Percentage vs. Passing Touchdown Percentage
Interception percentage and passing touchdown percentage are separate passing statistics.
Interception percentage:
(Interceptions ÷ Passing Attempts) × 100
Passing touchdown percentage:
(Passing Touchdowns ÷ Passing Attempts) × 100
Both use passing attempts as the denominator, but one measures interceptions while the other measures passing touchdowns.
Interception Percentage vs. Passer Rating
Interception percentage is not the same as passer rating.
Traditional NFL passer rating combines completion percentage, yards per attempt, touchdown percentage, and interception percentage into a single rating.
Interception percentage is therefore one of the statistics used in the traditional passer-rating calculation.
Use the NFL Passer Rating Calculator to calculate traditional passer rating.
Does Interception Percentage Include Rushing Attempts?
No. Interception percentage is based on passing attempts.
Rushing attempts are not used in the calculation because rushing plays do not represent passing attempts.
Does Interception Percentage Include Sacks?
No. Sacks are not counted as passing attempts in the standard NFL passing-attempt statistic.
Therefore, sacks are not entered separately into this interception-percentage calculation.
Does Interception Percentage Include Incomplete Passes?
Yes. Passing attempts are used as the denominator, so incomplete passes included in the passing-attempt total affect the calculation.
The calculation does not divide interceptions by completed passes.
Single-Game Interception Percentage
To calculate interception percentage for a single game, use the interceptions and passing attempts recorded for that game.
For example:
- 2 interceptions
- 32 passing attempts
Calculation:
(2 ÷ 32) × 100 = 6.25%
The quarterback's interception percentage for the game is 6.25%.
Season Interception Percentage
For a season or multiple-game calculation, use the total interceptions and total passing attempts for the period.
The formula remains:
(Total Interceptions ÷ Total Passing Attempts) × 100
For example:
- 12 interceptions
- 500 passing attempts
Calculation:
(12 ÷ 500) × 100 = 2.40%
The season interception percentage is 2.40%.
Do Not Average Game Interception Percentages
When calculating a multi-game or season interception percentage, use the combined interception total divided by the combined passing-attempt total.
Do not simply average interception percentages from individual games when the games have different numbers of passing attempts.
For example:
- Game 1: 1 interception on 20 attempts = 5.00%
- Game 2: 1 interception on 40 attempts = 2.50%
The simple average would be:
(5.00% + 2.50%) ÷ 2 = 3.75%
But the combined calculation is:
(1 + 1) ÷ (20 + 40) × 100 = 3.33%
Therefore, the correct combined interception percentage is 3.33%, not 3.75%.
Can Interception Percentage Be 0%?
Yes. If a quarterback has zero interceptions and at least one passing attempt, the interception percentage is 0.00%.
For example:
(0 ÷ 40) × 100 = 0.00%
Can Interception Percentage Be 100%?
Mathematically, yes. If every passing attempt results in an interception, the calculation would produce 100%.
For example:
(5 ÷ 5) × 100 = 100.00%
This is a mathematical example rather than an indication of a typical NFL statistical result.
Can Interception Percentage Be Greater Than 100%?
No, assuming valid passing statistics where interceptions do not exceed passing attempts.
Each interception thrown is associated with a passing attempt, so the basic rate cannot exceed 100% under valid statistical inputs.
Can Passing Attempts Be Zero?
No meaningful interception percentage can be calculated with zero passing attempts because division by zero is undefined.
This calculator therefore requires at least one passing attempt.
Why Use an Interception Percentage Calculator?
This calculator provides a quick way to calculate interception percentage without manually performing the calculation.
You can use it for:
- Single-game passing statistics
- Season passing statistics
- Quarterback statistics
- NFL statistics research
- Football data analysis
- Fantasy football research
- Checking manual calculations
Frequently Asked Questions
Find answers to common questions about interception percentage and how this calculator works.
What is interception percentage?
Interception percentage, or INT%, is the percentage of passing attempts that result in interceptions. It is calculated by dividing interceptions by passing attempts and multiplying by 100.
What is the interception percentage formula?
The formula is (Interceptions ÷ Passing Attempts) × 100.
What is 2 interceptions on 35 attempts?
Two interceptions on 35 passing attempts equals an interception percentage of 5.71%.
What is 3 interceptions on 50 attempts?
Three interceptions on 50 passing attempts equals an interception percentage of 6.00%.
Does interception percentage include incomplete passes?
Yes. Passing attempts are used as the denominator, so incomplete passes included in the passing-attempt total affect the calculation.
Does interception percentage include sacks?
No. Sacks are not counted as passing attempts in the standard NFL passing-attempt statistic and are not entered separately in this calculation.
Does interception percentage include rushing attempts?
No. Interception percentage uses passing attempts, not rushing attempts.
Can interception percentage be 0%?
Yes. Zero interceptions with at least one passing attempt produces an interception percentage of 0.00%.
Can interception percentage be 100%?
Mathematically, yes. If every passing attempt results in an interception, the calculation produces 100%.
Can interception percentage be greater than 100%?
No, assuming valid passing statistics where interceptions do not exceed passing attempts.
How do you calculate season interception percentage?
Divide total season interceptions by total season passing attempts and multiply by 100.
Should you average interception percentages from each game?
No. For a combined period, divide total interceptions by total passing attempts and multiply by 100.
Is interception percentage the same as passer rating?
No. Interception percentage is one passing statistic. Traditional passer rating combines multiple passing statistics.
Can passing attempts be zero?
No meaningful interception percentage can be calculated with zero passing attempts because division by zero is undefined.
Related NFL Calculators
You may also find these NFL and football calculators useful:
- NFL Passer Rating Calculator
- NFL Quarterback Rating Calculator
- Completion Percentage Calculator
- Yards Per Attempt Calculator
- Touchdown Percentage Calculator
- NFL Points Per Game Calculator
- NFL Point Differential Calculator
- NFL Standings Calculator
Final Thoughts
The NFL Interception Percentage Calculator provides a quick way to calculate interception percentage from interceptions thrown and passing attempts.
For a single game, use the passing statistics from that game. For a season or multiple games, use the combined interception total and combined passing-attempt total rather than averaging individual game percentages.