t, Chi-Square and F Distributions
F Distribution Table: α = 0.001
Upper 0.1% critical values of the F distribution, used for ANOVA F-tests, regression F-tests and comparing two variances.
- α = 0.001
- df₁ 1 to ∞, df₂ 1 to ∞
- Calculator included
F Table, α = 0.001
Columns: numerator df (df₁) · Rows: denominator df (df₂) · Cells: F with area α to its right
| Numerator df (df₁) → df₂ \ df₁ ↓ | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 12 | 15 | 20 | 24 | 30 | 40 | 60 | 120 | ∞ |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | 405284 | 499999 | 540379 | 562500 | 576405 | 585937 | 592873 | 598144 | 602284 | 605621 | 610668 | 615764 | 620908 | 623497 | 626099 | 628712 | 631337 | 633972 | 636619 |
| 2 | 998.5 | 999.0 | 999.2 | 999.2 | 999.3 | 999.3 | 999.4 | 999.4 | 999.4 | 999.4 | 999.4 | 999.4 | 999.4 | 999.5 | 999.5 | 999.5 | 999.5 | 999.5 | 999.5 |
| 3 | 167.0 | 148.5 | 141.1 | 137.1 | 134.6 | 132.8 | 131.6 | 130.6 | 129.9 | 129.2 | 128.3 | 127.4 | 126.4 | 125.9 | 125.4 | 125.0 | 124.5 | 124.0 | 123.5 |
| 4 | 74.14 | 61.25 | 56.18 | 53.44 | 51.71 | 50.53 | 49.66 | 49.00 | 48.47 | 48.05 | 47.41 | 46.76 | 46.10 | 45.77 | 45.43 | 45.09 | 44.75 | 44.40 | 44.05 |
| 5 | 47.18 | 37.12 | 33.20 | 31.09 | 29.75 | 28.83 | 28.16 | 27.65 | 27.24 | 26.92 | 26.42 | 25.91 | 25.39 | 25.13 | 24.87 | 24.60 | 24.33 | 24.06 | 23.79 |
| 6 | 35.51 | 27.00 | 23.70 | 21.92 | 20.80 | 20.03 | 19.46 | 19.03 | 18.69 | 18.41 | 17.99 | 17.56 | 17.12 | 16.90 | 16.67 | 16.44 | 16.21 | 15.98 | 15.75 |
| 7 | 29.25 | 21.69 | 18.77 | 17.20 | 16.21 | 15.52 | 15.02 | 14.63 | 14.33 | 14.08 | 13.71 | 13.32 | 12.93 | 12.73 | 12.53 | 12.33 | 12.12 | 11.91 | 11.70 |
| 8 | 25.41 | 18.49 | 15.83 | 14.39 | 13.48 | 12.86 | 12.40 | 12.05 | 11.77 | 11.54 | 11.19 | 10.84 | 10.48 | 10.30 | 10.11 | 9.919 | 9.727 | 9.532 | 9.334 |
| 9 | 22.86 | 16.39 | 13.90 | 12.56 | 11.71 | 11.13 | 10.70 | 10.37 | 10.11 | 9.894 | 9.570 | 9.238 | 8.898 | 8.724 | 8.548 | 8.369 | 8.187 | 8.001 | 7.813 |
| 10 | 21.04 | 14.91 | 12.55 | 11.28 | 10.48 | 9.926 | 9.517 | 9.204 | 8.956 | 8.754 | 8.445 | 8.129 | 7.804 | 7.638 | 7.469 | 7.297 | 7.122 | 6.944 | 6.762 |
| 11 | 19.69 | 13.81 | 11.56 | 10.35 | 9.578 | 9.047 | 8.655 | 8.355 | 8.116 | 7.922 | 7.626 | 7.321 | 7.008 | 6.847 | 6.684 | 6.518 | 6.348 | 6.175 | 5.998 |
| 12 | 18.64 | 12.97 | 10.80 | 9.633 | 8.892 | 8.379 | 8.001 | 7.710 | 7.480 | 7.292 | 7.005 | 6.709 | 6.405 | 6.249 | 6.090 | 5.928 | 5.762 | 5.593 | 5.420 |
| 13 | 17.82 | 12.31 | 10.21 | 9.073 | 8.354 | 7.856 | 7.489 | 7.206 | 6.982 | 6.799 | 6.519 | 6.231 | 5.934 | 5.781 | 5.626 | 5.467 | 5.305 | 5.138 | 4.967 |
| 14 | 17.14 | 11.78 | 9.729 | 8.622 | 7.922 | 7.436 | 7.077 | 6.802 | 6.583 | 6.404 | 6.130 | 5.848 | 5.557 | 5.407 | 5.254 | 5.098 | 4.938 | 4.773 | 4.604 |
| 15 | 16.59 | 11.34 | 9.335 | 8.253 | 7.567 | 7.092 | 6.741 | 6.471 | 6.256 | 6.081 | 5.812 | 5.535 | 5.248 | 5.101 | 4.950 | 4.796 | 4.638 | 4.475 | 4.307 |
| 16 | 16.12 | 10.97 | 9.006 | 7.944 | 7.272 | 6.805 | 6.460 | 6.195 | 5.984 | 5.812 | 5.547 | 5.274 | 4.992 | 4.846 | 4.697 | 4.545 | 4.388 | 4.226 | 4.059 |
| 17 | 15.72 | 10.66 | 8.727 | 7.683 | 7.022 | 6.562 | 6.223 | 5.962 | 5.754 | 5.584 | 5.324 | 5.054 | 4.775 | 4.631 | 4.484 | 4.332 | 4.177 | 4.016 | 3.850 |
| 18 | 15.38 | 10.39 | 8.487 | 7.459 | 6.808 | 6.355 | 6.021 | 5.763 | 5.558 | 5.390 | 5.132 | 4.866 | 4.590 | 4.447 | 4.301 | 4.151 | 3.996 | 3.836 | 3.670 |
| 19 | 15.08 | 10.16 | 8.280 | 7.265 | 6.622 | 6.175 | 5.845 | 5.590 | 5.388 | 5.222 | 4.967 | 4.704 | 4.430 | 4.288 | 4.143 | 3.994 | 3.840 | 3.680 | 3.514 |
| 20 | 14.82 | 9.953 | 8.098 | 7.096 | 6.461 | 6.019 | 5.692 | 5.440 | 5.239 | 5.075 | 4.823 | 4.562 | 4.290 | 4.149 | 4.005 | 3.856 | 3.703 | 3.544 | 3.378 |
| 21 | 14.59 | 9.772 | 7.938 | 6.947 | 6.318 | 5.881 | 5.557 | 5.308 | 5.109 | 4.946 | 4.696 | 4.437 | 4.167 | 4.027 | 3.884 | 3.736 | 3.583 | 3.424 | 3.257 |
| 22 | 14.38 | 9.612 | 7.796 | 6.814 | 6.191 | 5.758 | 5.438 | 5.190 | 4.993 | 4.832 | 4.583 | 4.326 | 4.058 | 3.919 | 3.776 | 3.629 | 3.476 | 3.317 | 3.151 |
| 23 | 14.20 | 9.469 | 7.669 | 6.696 | 6.078 | 5.649 | 5.331 | 5.085 | 4.890 | 4.730 | 4.483 | 4.227 | 3.961 | 3.822 | 3.680 | 3.533 | 3.380 | 3.222 | 3.055 |
| 24 | 14.03 | 9.339 | 7.554 | 6.589 | 5.977 | 5.550 | 5.235 | 4.991 | 4.797 | 4.638 | 4.393 | 4.139 | 3.873 | 3.735 | 3.593 | 3.447 | 3.295 | 3.136 | 2.969 |
| 25 | 13.88 | 9.223 | 7.451 | 6.493 | 5.885 | 5.462 | 5.148 | 4.906 | 4.713 | 4.555 | 4.312 | 4.059 | 3.794 | 3.657 | 3.515 | 3.369 | 3.217 | 3.058 | 2.890 |
| 26 | 13.74 | 9.116 | 7.357 | 6.406 | 5.802 | 5.381 | 5.070 | 4.829 | 4.637 | 4.480 | 4.238 | 3.986 | 3.723 | 3.586 | 3.445 | 3.299 | 3.147 | 2.988 | 2.819 |
| 27 | 13.61 | 9.019 | 7.272 | 6.326 | 5.726 | 5.308 | 4.998 | 4.759 | 4.568 | 4.412 | 4.171 | 3.920 | 3.658 | 3.521 | 3.380 | 3.234 | 3.082 | 2.923 | 2.754 |
| 28 | 13.50 | 8.931 | 7.193 | 6.253 | 5.656 | 5.241 | 4.933 | 4.695 | 4.505 | 4.349 | 4.109 | 3.859 | 3.598 | 3.462 | 3.321 | 3.176 | 3.024 | 2.864 | 2.695 |
| 29 | 13.39 | 8.849 | 7.121 | 6.186 | 5.593 | 5.179 | 4.873 | 4.636 | 4.447 | 4.292 | 4.053 | 3.804 | 3.543 | 3.407 | 3.267 | 3.121 | 2.970 | 2.810 | 2.640 |
| 30 | 13.29 | 8.773 | 7.054 | 6.125 | 5.534 | 5.122 | 4.817 | 4.581 | 4.393 | 4.239 | 4.001 | 3.753 | 3.493 | 3.357 | 3.217 | 3.072 | 2.920 | 2.760 | 2.589 |
| 40 | 12.61 | 8.251 | 6.595 | 5.698 | 5.128 | 4.731 | 4.436 | 4.207 | 4.024 | 3.874 | 3.642 | 3.400 | 3.145 | 3.011 | 2.872 | 2.727 | 2.574 | 2.410 | 2.233 |
| 60 | 11.97 | 7.768 | 6.171 | 5.307 | 4.757 | 4.372 | 4.086 | 3.865 | 3.687 | 3.541 | 3.315 | 3.078 | 2.827 | 2.694 | 2.555 | 2.409 | 2.252 | 2.082 | 1.890 |
| 120 | 11.38 | 7.321 | 5.781 | 4.947 | 4.416 | 4.044 | 3.767 | 3.552 | 3.379 | 3.237 | 3.016 | 2.783 | 2.534 | 2.402 | 2.262 | 2.113 | 1.950 | 1.767 | 1.543 |
| ∞ | 10.83 | 6.908 | 5.422 | 4.617 | 4.103 | 3.743 | 3.475 | 3.266 | 3.097 | 2.959 | 2.742 | 2.513 | 2.266 | 2.132 | 1.990 | 1.835 | 1.660 | 1.447 | 1.000 |
Tip: click any value to highlight its row and column.
How to read this table
- Find df₁ (numerator) and df₂ (denominator). In a one-way ANOVA with k groups and N subjects, df₁ = k − 1 and df₂ = N − k.
- Go across to the column for df₁ and down to the row for df₂.
- Reject H₀ at α = 0.001 if your F statistic is larger than the cell.
- For other significance levels, switch table with the buttons above, or use the calculator for any df and α.
Worked example
A one-way ANOVA compares 3 treatment groups with 11 patients each, so df₁ = 3 − 1 = 2 and df₂ = 33 − 3 = 30. Column 2, row 30 gives 8.773. An F statistic larger than 8.773 is significant at α = 0.001.
Lower critical values. The table gives upper-tail values only. For a lower critical value, swap the degrees of freedom and take the reciprocal: Flower(df₁, df₂) = 1 / Fupper(df₂, df₁). For example, the lower critical value for (2, 30) is 1 / 999.5 = 0.0010. The calculator above shows both.
Click the underlined links to highlight the value in the table.
Calculator
For values between the rows and columns of the table. Results update as you type.
Formula and how the values were computed
Each cell is the upper-0.001 quantile of the F distribution with (df₁, df₂) degrees of freedom, computed in double precision. The ∞ columns and rows are the limiting chi-square forms.
Frequently asked questions
Which df goes across and which goes down?
The numerator df (df₁, from the mean square for groups or the model) goes across the top. The denominator df (df₂, from the error mean square) goes down the side. Swapping them gives a different, wrong value.
My df is not in the table. What should I use?
For df₂ between listed rows, the smaller df gives a slightly larger, conservative critical value. For an exact value, enter your df in the calculator above.
Can I use this table to compare two variances?
Yes. Put the larger sample variance in the numerator, so F ≥ 1, and compare it with the critical value for α/2 when the test is two-sided.