Top SEO Factor data is updated daily for latest "month to date" measurements.
| Name | Correlation | #1 Max | Page 1 Avg | Usage % | Searches % | |
| 1 | Number of HTML Tags Size | -0.16 | 3541 | 1047 | 84 % | 84 % |
| 2 | Unabridged Word Count Size | -0.16 | 18512 | 1916 | 84 % | 84 % |
| 3 | Number of Sentences Size | -0.16 | 1778 | 125 | 82 % | 85 % |
| 4 | Word Count Size | -0.16 | 10647 | 1535 | 84 % | 84 % |
| 5 | Number of Images Size | -0.16 | 180 | 30 | 80 % | 83 % |
| 6 | Number of P Tags Size | -0.16 | 199 | 40 | 79 % | 82 % |
| 7 | Clean Text Kilobytes Size | -0.15 | 103 | 13 | 80 % | 87 % |
| 8 | Number of Images with ALT Text Size | -0.15 | 177 | 20 | 75 % | 86 % |
| 9 | Number of Questions Size | -0.15 | 64 | 11 | 68 % | 84 % |
| 10 | Page Size Kilobytes Size | -0.15 | 1043 | 257 | 83 % | 83 % |
| 11 | Search Result Host Length Size | -0.15 | 25 | 18 | 83 % | 73 % |
| 12 | Number of Heading Tags Size | -0.15 | 87 | 22 | 80 % | 82 % |
| 13 | Inline CSS Kilobytes Size | -0.15 | 249 | 62 | 65 % | 84 % |
| 14 | Number of H2 Tags Size | -0.14 | 19 | 7 | 71 % | 79 % |
| 15 | Search Result Domain Length Size | -0.14 | 25 | 18 | 83 % | 76 % |
| 16 | Number of H1 Tags Size | -0.14 | 4 | 2 | 74 % | 79 % |
| 17 | Number of Questions In Headings Size | -0.14 | 10 | 2 | 39 % | 82 % |
| 18 | Number of H3 Tags Size | -0.14 | 30 | 9 | 64 % | 80 % |
| 19 | Number of HTML Comments Size | -0.14 | 493 | 45 | 75 % | 81 % |
| 20 | Search Result URL Length Size | -0.14 | 104 | 63 | 95 % | 60 % |
| 21 | Inline JavaScript Kilobytes Size | -0.14 | 555 | 70 | 81 % | 80 % |
| 22 | Number of Prices Size | -0.14 | 915 | 63 | 68 % | 83 % |
| 23 | Title Word Count Size | -0.14 | 21 | 8 | 82 % | 75 % |
| 24 | Number of Images without ALT Text Size | -0.13 | 109 | 10 | 60 % | 80 % |
| 25 | Title Length Size | -0.13 | 150 | 52 | 82 % | 74 % |
| 26 | Word Count in Meta Description Size | -0.13 | 118 | 20 | 66 % | 74 % |
| 27 | Number of Questions In H3 Tags Size | -0.13 | 5 | 1 | 18 % | 80 % |
| 28 | Number of Questions In H2 Tags Size | -0.13 | 4 | 1 | 24 % | 77 % |
| 29 | Meta Description Length Size | -0.12 | 850 | 122 | 67 % | 76 % |
| 30 | Average Words Per Sentence Size | -0.12 | 239 | 34 | 81 % | 75 % |
| 31 | Number of H4 Tags Size | -0.12 | 80 | 4 | 39 % | 75 % |
| 32 | Number of HREF Lang Tags Size | -0.11 | 18 | 2 | 10 % | 68 % |
| 33 | Number of H5 Tags Size | -0.1 | 22 | 2 | 19 % | 71 % |
| 34 | Number of H6 Tags Size | -0.1 | 10 | 1 | 10 % | 64 % |
| 35 | Search Result Summary Length Size | -0.1 | 186 | 154 | 93 % | 46 % |
| 36 | Search Result Link Text Length Size | -0.1 | 53 | 45 | 96 % | 56 % |
| 37 | Bytes To First P Tag Size | -0.1 | 93655 | 67859 | 95 % | 51 % |
| 38 | Number of Questions In H4 Tags Size | -0.09 | 3 | 1 | 6 % | 67 % |
| 39 | Number of Questions In H1 Tags Size | -0.09 | 2 | 1 | 6 % | 61 % |
| 40 | Number of Bytes to First Match Size | -0.08 | 9971172 | 1277490 | 95 % | 36 % |
| 41 | Number of Schema Products Size | -0.08 | 6 | 1 | 3 % | 73 % |
| 42 | Number of Questions In H5 Tags Size | -0.06 | 5 | 1 | 2 % | 65 % |
| 43 | Number of Questions In H6 Tags Size | -0.03 | 2 | 0 | 1 % | 69 % |
| 44 | Body Tag Size Kilobytes Size | -0 | 157 | 0 | 0 % | 94 % |
| 45 | Head Size Kilobytes Size | -0 | 69 | 0 | 0 % | 94 % |
| 46 | Ahrefs Has HTML Pages Size | 0 | 0 | 0 | 0 % | 80 % |
| 47 | Ahrefs HTML Pages Size | 0 | 0 | 0 | 0 % | 80 % |
| 48 | Ahrefs Pages Size | 0 | 0 | 0 | 0 % | 80 % |
| 49 | Ahrefs Page Size Size | 0 | 0 | 0 | 0 % | 80 % |
| 50 | Ahrefs Word Count Size | 0 | 0 | 0 | 0 % | 80 % |
| 51 | Bing Page Count Size | 0 | 0 | 0 | 0 % | 94 % |