You can easily find the p value corresponding to an F value with our . If you want to find the p value by using a table with critical F values, instructions are given below.
Finding $p$ value corresponding to $F$ value, using the table with critical $F$ values
Assuming a table giving five upper tail probabilities (denoted $p$ or $\alpha$) per df numerator / df denominator combination
$p$ value is the probability of finding the observed $F$ value or a larger value, given that the null hypothesis is true.