Convert distances between kilometres, miles, yards and furlongs.
| Distance | Split Time | Lap Time | Lap Length |
|---|
This table shows paces multiplied by distances, which of course becomes finish times.
| Finish times | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Pace | 100 m | 400 m | 800 m | 3 km | 5 km | 10 km | HM | Marathon | 50 mi | 100 km | 100 mi |
| 2:30 | 15s | 1:00 | 2:00 | 7:30 | 12:30 | 25:00 | 52:45 | 1:45:29 | 3:21:10 | 4:10:00 | 6:42:20 |
| 2:40 | 16s | 1:04 | 2:08 | 8:00 | 13:20 | 26:40 | 56:16 | 1:52:31 | 3:34:35 | 4:26:40 | 7:09:10 |
| 2:50 | 17s | 1:08 | 2:16 | 8:30 | 14:10 | 28:20 | 59:47 | 1:59:33 | 3:47:59 | 4:43:20 | 7:35:59 |
| 3:00 | 18s | 1:12 | 2:24 | 9:00 | 15:00 | 30:00 | 1:03:18 | 2:06:35 | 4:01:24 | 5:00:00 | 8:02:48 |
| 3:10 | 19s | 1:16 | 2:32 | 9:30 | 15:50 | 31:40 | 1:06:49 | 2:13:37 | 4:14:49 | 5:16:40 | 8:29:38 |
| 3:20 | 20s | 1:20 | 2:40 | 10:00 | 16:40 | 33:20 | 1:10:20 | 2:20:39 | 4:28:13 | 5:33:20 | 8:56:27 |
| 3:30 | 21s | 1:24 | 2:48 | 10:30 | 17:30 | 35:00 | 1:13:50 | 2:27:41 | 4:41:38 | 5:50:00 | 9:23:16 |
| 3:40 | 22s | 1:28 | 2:56 | 11:00 | 18:20 | 36:40 | 1:17:21 | 2:34:43 | 4:55:03 | 6:06:40 | 9:50:06 |
| 3:50 | 23s | 1:32 | 3:04 | 11:30 | 19:10 | 38:20 | 1:20:52 | 2:41:45 | 5:08:27 | 6:23:20 | 10:16:55 |
| 4:00 | 24s | 1:36 | 3:12 | 12:00 | 20:00 | 40:00 | 1:24:23 | 2:48:47 | 5:21:52 | 6:40:00 | 10:43:44 |
| 4:10 | 25s | 1:40 | 3:20 | 12:30 | 20:50 | 41:40 | 1:27:54 | 2:55:49 | 5:35:17 | 6:56:40 | 11:10:34 |
| 4:20 | 26s | 1:44 | 3:28 | 13:00 | 21:40 | 43:20 | 1:31:25 | 3:02:51 | 5:48:41 | 7:13:20 | 11:37:23 |
| 4:30 | 27s | 1:48 | 3:36 | 13:30 | 22:30 | 45:00 | 1:34:56 | 3:09:53 | 6:02:06 | 7:30:00 | 12:04:12 |
| 4:40 | 28s | 1:52 | 3:44 | 14:00 | 23:20 | 46:40 | 1:38:27 | 3:16:55 | 6:15:31 | 7:46:40 | 12:31:02 |
| 4:50 | 29s | 1:56 | 3:52 | 14:30 | 24:10 | 48:20 | 1:41:58 | 3:23:57 | 6:28:55 | 8:03:20 | 12:57:51 |
| 5:00 | 30s | 2:00 | 4:00 | 15:00 | 25:00 | 50:00 | 1:45:29 | 3:30:59 | 6:42:20 | 8:20:00 | 13:24:40 |
| 5:10 | 31s | 2:04 | 4:08 | 15:30 | 25:50 | 51:40 | 1:49:00 | 3:38:00 | 6:55:45 | 8:36:40 | 13:51:30 |
| 5:20 | 32s | 2:08 | 4:16 | 16:00 | 26:40 | 53:20 | 1:52:31 | 3:45:02 | 7:09:10 | 8:53:20 | 14:18:19 |
| 5:30 | 33s | 2:12 | 4:24 | 16:30 | 27:30 | 55:00 | 1:56:02 | 3:52:04 | 7:22:34 | 9:10:00 | 14:45:08 |
| 5:40 | 34s | 2:16 | 4:32 | 17:00 | 28:20 | 56:40 | 1:59:33 | 3:59:06 | 7:35:59 | 9:26:40 | 15:11:58 |
| 5:50 | 35s | 2:20 | 4:40 | 17:30 | 29:10 | 58:20 | 2:03:04 | 4:06:08 | 7:49:24 | 9:43:20 | 15:38:47 |
| 6:00 | 36s | 2:24 | 4:48 | 18:00 | 30:00 | 1:00:00 | 2:06:35 | 4:13:10 | 8:02:48 | 10:00:00 | 16:05:36 |
| 6:10 | 37s | 2:28 | 4:56 | 18:30 | 30:50 | 1:01:40 | 2:10:06 | 4:20:12 | 8:16:13 | 10:16:40 | 16:32:26 |
| 6:20 | 38s | 2:32 | 5:04 | 19:00 | 31:40 | 1:03:20 | 2:13:37 | 4:27:14 | 8:29:38 | 10:33:20 | 16:59:15 |
| 6:30 | 39s | 2:36 | 5:12 | 19:30 | 32:30 | 1:05:00 | 2:17:08 | 4:34:16 | 8:43:02 | 10:50:00 | 17:26:04 |
| 6:40 | 40s | 2:40 | 5:20 | 20:00 | 33:20 | 1:06:40 | 2:20:39 | 4:41:18 | 8:56:27 | 11:06:40 | 17:52:54 |
| 6:50 | 41s | 2:44 | 5:28 | 20:30 | 34:10 | 1:08:20 | 2:24:10 | 4:48:20 | 9:09:52 | 11:23:20 | 18:19:43 |
| 7:00 | 42s | 2:48 | 5:36 | 21:00 | 35:00 | 1:10:00 | 2:27:41 | 4:55:22 | 9:23:16 | 11:40:00 | 18:46:32 |
| 4:00 | 15s | 1:00 | 1:59 | 7:27 | 12:26 | 24:51 | 52:26 | 1:44:53 | 3:20:00 | 4:08:33 | 6:40:00 |
| 4:10 | 16s | 1:02 | 2:04 | 7:46 | 12:57 | 25:53 | 54:37 | 1:49:15 | 3:28:20 | 4:18:54 | 6:56:40 |
| 4:20 | 16s | 1:05 | 2:09 | 8:05 | 13:28 | 26:56 | 56:48 | 1:53:37 | 3:36:40 | 4:29:16 | 7:13:20 |
| 4:30 | 17s | 1:07 | 2:14 | 8:23 | 13:59 | 27:58 | 59:00 | 1:57:59 | 3:45:00 | 4:39:37 | 7:30:00 |
| 4:40 | 17s | 1:10 | 2:19 | 8:42 | 14:30 | 29:00 | 1:01:11 | 2:02:21 | 3:53:20 | 4:49:58 | 7:46:40 |
| 4:50 | 18s | 1:12 | 2:24 | 9:01 | 15:01 | 30:02 | 1:03:22 | 2:06:43 | 4:01:40 | 5:00:20 | 8:03:20 |
| 5:00 | 19s | 1:15 | 2:29 | 9:19 | 15:32 | 31:04 | 1:05:33 | 2:11:06 | 4:10:00 | 5:10:41 | 8:20:00 |
| 5:10 | 19s | 1:17 | 2:34 | 9:38 | 16:03 | 32:06 | 1:07:44 | 2:15:28 | 4:18:20 | 5:21:03 | 8:36:40 |
| 5:20 | 20s | 1:20 | 2:39 | 9:57 | 16:34 | 33:08 | 1:09:55 | 2:19:50 | 4:26:40 | 5:31:24 | 8:53:20 |
| 5:30 | 21s | 1:22 | 2:44 | 10:15 | 17:05 | 34:11 | 1:12:06 | 2:24:12 | 4:35:00 | 5:41:45 | 9:10:00 |
| 5:40 | 21s | 1:25 | 2:49 | 10:34 | 17:36 | 35:13 | 1:14:17 | 2:28:34 | 4:43:20 | 5:52:07 | 9:26:40 |
| 5:50 | 22s | 1:27 | 2:54 | 10:52 | 18:07 | 36:15 | 1:16:28 | 2:32:57 | 4:51:40 | 6:02:28 | 9:43:20 |
| 6:00 | 22s | 1:29 | 2:59 | 11:11 | 18:38 | 37:17 | 1:18:39 | 2:37:19 | 5:00:00 | 6:12:49 | 10:00:00 |
| 6:10 | 23s | 1:32 | 3:04 | 11:30 | 19:10 | 38:19 | 1:20:50 | 2:41:41 | 5:08:20 | 6:23:11 | 10:16:40 |
| 6:20 | 24s | 1:34 | 3:09 | 11:48 | 19:41 | 39:21 | 1:23:02 | 2:46:03 | 5:16:40 | 6:33:32 | 10:33:20 |
| 6:30 | 24s | 1:37 | 3:14 | 12:07 | 20:12 | 40:23 | 1:25:13 | 2:50:25 | 5:25:00 | 6:43:53 | 10:50:00 |
| 6:40 | 25s | 1:39 | 3:19 | 12:26 | 20:43 | 41:25 | 1:27:24 | 2:54:48 | 5:33:20 | 6:54:15 | 11:06:40 |
| 6:50 | 25s | 1:42 | 3:24 | 12:44 | 21:14 | 42:28 | 1:29:35 | 2:59:10 | 5:41:40 | 7:04:36 | 11:23:20 |
| 7:00 | 26s | 1:44 | 3:29 | 13:03 | 21:45 | 43:30 | 1:31:46 | 3:03:32 | 5:50:00 | 7:14:58 | 11:40:00 |
| 7:10 | 27s | 1:47 | 3:34 | 13:22 | 22:16 | 44:32 | 1:33:57 | 3:07:54 | 5:58:20 | 7:25:19 | 11:56:40 |
| 7:20 | 27s | 1:49 | 3:39 | 13:40 | 22:47 | 45:34 | 1:36:08 | 3:12:16 | 6:06:40 | 7:35:40 | 12:13:20 |
| 7:30 | 28s | 1:52 | 3:44 | 13:59 | 23:18 | 46:36 | 1:38:19 | 3:16:38 | 6:15:00 | 7:46:02 | 12:30:00 |
| 7:40 | 29s | 1:54 | 3:49 | 14:17 | 23:49 | 47:38 | 1:40:30 | 3:21:01 | 6:23:20 | 7:56:23 | 12:46:40 |
| 7:50 | 29s | 1:57 | 3:54 | 14:36 | 24:20 | 48:40 | 1:42:41 | 3:25:23 | 6:31:40 | 8:06:44 | 13:03:20 |
| 8:00 | 30s | 1:59 | 3:59 | 14:55 | 24:51 | 49:43 | 1:44:53 | 3:29:45 | 6:40:00 | 8:17:06 | 13:20:00 |
| 8:10 | 30s | 2:02 | 4:04 | 15:13 | 25:22 | 50:45 | 1:47:04 | 3:34:07 | 6:48:20 | 8:27:27 | 13:36:40 |
| 8:20 | 31s | 2:04 | 4:09 | 15:32 | 25:53 | 51:47 | 1:49:15 | 3:38:29 | 6:56:40 | 8:37:49 | 13:53:20 |
| 8:30 | 32s | 2:07 | 4:14 | 15:51 | 26:24 | 52:49 | 1:51:26 | 3:42:52 | 7:05:00 | 8:48:10 | 14:10:00 |
| 8:40 | 32s | 2:09 | 4:18 | 16:09 | 26:56 | 53:51 | 1:53:37 | 3:47:14 | 7:13:20 | 8:58:31 | 14:26:40 |
| 8:50 | 33s | 2:12 | 4:23 | 16:28 | 27:27 | 54:53 | 1:55:48 | 3:51:36 | 7:21:40 | 9:08:53 | 14:43:20 |
| 9:00 | 34s | 2:14 | 4:28 | 16:47 | 27:58 | 55:55 | 1:57:59 | 3:55:58 | 7:30:00 | 9:19:14 | 15:00:00 |
| 9:10 | 34s | 2:17 | 4:33 | 17:05 | 28:29 | 56:58 | 2:00:10 | 4:00:20 | 7:38:20 | 9:29:35 | 15:16:40 |
| 9:20 | 35s | 2:19 | 4:38 | 17:24 | 29:00 | 58:00 | 2:02:21 | 4:04:43 | 7:46:40 | 9:39:57 | 15:33:20 |
| 9:30 | 35s | 2:22 | 4:43 | 17:43 | 29:31 | 59:02 | 2:04:32 | 4:09:05 | 7:55:00 | 9:50:18 | 15:50:00 |
| 9:40 | 36s | 2:24 | 4:48 | 18:01 | 30:02 | 1:00:04 | 2:06:43 | 4:13:27 | 8:03:20 | 10:00:40 | 16:06:40 |
| 9:50 | 37s | 2:27 | 4:53 | 18:20 | 30:33 | 1:01:06 | 2:08:55 | 4:17:49 | 8:11:40 | 10:11:01 | 16:23:20 |
| 10:00 | 37s | 2:29 | 4:58 | 18:38 | 31:04 | 1:02:08 | 2:11:06 | 4:22:11 | 8:20:00 | 10:21:22 | 16:40:00 |
| 10:10 | 38s | 2:32 | 5:03 | 18:57 | 31:35 | 1:03:10 | 2:13:17 | 4:26:33 | 8:28:20 | 10:31:44 | 16:56:40 |
| 10:20 | 39s | 2:34 | 5:08 | 19:16 | 32:06 | 1:04:13 | 2:15:28 | 4:30:56 | 8:36:40 | 10:42:05 | 17:13:20 |
| 10:30 | 39s | 2:37 | 5:13 | 19:34 | 32:37 | 1:05:15 | 2:17:39 | 4:35:18 | 8:45:00 | 10:52:26 | 17:30:00 |
| 10:40 | 40s | 2:39 | 5:18 | 19:53 | 33:08 | 1:06:17 | 2:19:50 | 4:39:40 | 8:53:20 | 11:02:48 | 17:46:40 |
| 10:50 | 40s | 2:42 | 5:23 | 20:12 | 33:39 | 1:07:19 | 2:22:01 | 4:44:02 | 9:01:40 | 11:13:09 | 18:03:20 |
| 11:00 | 41s | 2:44 | 5:28 | 20:30 | 34:11 | 1:08:21 | 2:24:12 | 4:48:24 | 9:10:00 | 11:23:30 | 18:20:00 |
The laps in a backyard ultra are always 6706 meters (4.167 miles), and must be completed within one hour.
The table below shows what pace you must keep to be able to rest for a certain duration before the next lap starts.
| Rest | Pace | |
|---|---|---|
| 0 min | 8:57 min/km | 14:24 min/mi |
| 1 min | 8:48 min/km | 14:10 min/mi |
| 2 min | 8:39 min/km | 13:55 min/mi |
| 3 min | 8:30 min/km | 13:41 min/mi |
| 4 min | 8:21 min/km | 13:26 min/mi |
| 5 min | 8:12 min/km | 13:12 min/mi |
| 6 min | 8:03 min/km | 12:58 min/mi |
| 7 min | 7:54 min/km | 12:43 min/mi |
| 8 min | 7:45 min/km | 12:29 min/mi |
| 9 min | 7:36 min/km | 12:14 min/mi |
| 10 min | 7:27 min/km | 12:00 min/mi |
| 11 min | 7:18 min/km | 11:46 min/mi |
| 12 min | 7:09 min/km | 11:31 min/mi |
| 13 min | 7:01 min/km | 11:17 min/mi |
| 14 min | 6:52 min/km | 11:02 min/mi |
| 15 min | 6:43 min/km | 10:48 min/mi |
| 16 min | 6:34 min/km | 10:34 min/mi |
| 17 min | 6:25 min/km | 10:19 min/mi |
| 18 min | 6:16 min/km | 10:05 min/mi |
| 19 min | 6:07 min/km | 9:50 min/mi |
| 20 min | 5:58 min/km | 9:36 min/mi |
This table shows the total distance completed after a certain number of laps. The time is the number of laps times 1 hour.
| Laps | Distance | |
|---|---|---|
| 1 | 6.706 km | 4.167 mi |
| 2 | 13.412 km | 8.334 mi |
| 3 | 20.118 km | 12.501 mi |
| 4 | 26.824 km | 16.668 mi |
| 5 | 33.53 km | 20.835 mi |
| 6 | 40.236 km | 25.001 mi |
| 7 | 46.942 km | 29.168 mi |
| 8 | 53.648 km | 33.335 mi |
| 9 | 60.354 km | 37.502 mi |
| 10 | 67.06 km | 41.669 mi |
| 11 | 73.766 km | 45.836 mi |
| 12 | 80.472 km | 50.003 mi |
| 13 | 87.178 km | 54.17 mi |
| 14 | 93.884 km | 58.337 mi |
| 15 | 100.59 km | 62.504 mi |
| 16 | 107.296 km | 66.671 mi |
| 17 | 114.002 km | 70.838 mi |
| 18 | 120.708 km | 75.004 mi |
| 19 | 127.414 km | 79.171 mi |
| 20 | 134.12 km | 83.338 mi |
| 21 | 140.826 km | 87.505 mi |
| 22 | 147.532 km | 91.672 mi |
| 23 | 154.238 km | 95.839 mi |
| 24 | 160.944 km | 100.006 mi |
| 25 | 167.65 km | 104.173 mi |
| 26 | 174.356 km | 108.34 mi |
| 27 | 181.062 km | 112.507 mi |
| 28 | 187.768 km | 116.674 mi |
| 29 | 194.474 km | 120.841 mi |
| 30 | 201.18 km | 125.007 mi |
| 31 | 207.886 km | 129.174 mi |
| 32 | 214.592 km | 133.341 mi |
| 33 | 221.298 km | 137.508 mi |
| 34 | 228.004 km | 141.675 mi |
| 35 | 234.71 km | 145.842 mi |
| 36 | 241.416 km | 150.009 mi |
| 37 | 248.122 km | 154.176 mi |
| 38 | 254.828 km | 158.343 mi |
| 39 | 261.534 km | 162.51 mi |
| 40 | 268.24 km | 166.677 mi |
| 41 | 274.946 km | 170.844 mi |
| 42 | 281.652 km | 175.01 mi |
| 43 | 288.358 km | 179.177 mi |
| 44 | 295.064 km | 183.344 mi |
| 45 | 301.77 km | 187.511 mi |
| 46 | 308.476 km | 191.678 mi |
| 47 | 315.182 km | 195.845 mi |
| 48 | 321.888 km | 200.012 mi |
| 49 | 328.594 km | 204.179 mi |
| 50 | 335.3 km | 208.346 mi |
| 51 | 342.006 km | 212.513 mi |
| 52 | 348.712 km | 216.68 mi |
| 53 | 355.418 km | 220.847 mi |
| 54 | 362.124 km | 225.013 mi |
| 55 | 368.83 km | 229.18 mi |
| 56 | 375.536 km | 233.347 mi |
| 57 | 382.242 km | 237.514 mi |
| 58 | 388.948 km | 241.681 mi |
| 59 | 395.654 km | 245.848 mi |
| 60 | 402.36 km | 250.015 mi |
| 61 | 409.066 km | 254.182 mi |
| 62 | 415.772 km | 258.349 mi |
| 63 | 422.478 km | 262.516 mi |
| 64 | 429.184 km | 266.683 mi |
| 65 | 435.89 km | 270.849 mi |
| 66 | 442.596 km | 275.016 mi |
| 67 | 449.302 km | 279.183 mi |
| 68 | 456.008 km | 283.35 mi |
| 69 | 462.714 km | 287.517 mi |
| 70 | 469.42 km | 291.684 mi |
This calculator uses Jack Daniels" formula for calculating "VDOT" ( V̇O2max) from a race performance, which is not the same thing as VO2max, but is somewhat related.
You can use VDOT to compare performances or to get training paces from (see Jack Daniels" calculator).
It is recommended to use a race distance between 1500 m and 50 km.
Distances can be entered as e.g. "5k", "1mi", "400yds", "Marathon", "Half Marathon", or simply "1000m" or "2.5km".
Time and pace can be entered as e.g. "30m", "7m30s", "4h30m", or (HH:)MM:SS.
This calculator "splits" the above distance into smaller chunks below, and calculates how fast each part of the distance was covered, on average. It is very likely that the speed varied, which means that some parts were even faster than this.
Distances can be entered as e.g. "5k", "1mi", "400yds", "Marathon", "Half Marathon", or simply "1000m" or "2.5km".
Time and pace can be entered as e.g. "30m", "7m30s", "4h30m", or (HH:)MM:SS.
| Distance | Time |
|---|
By entering a known (recent) race time, you can predict the equivalent race time at another distance.
Race Prediction Calculator is a useful tool for beginners and experienced runners looking to improve their performance in a 5K, 10K, Half Marathon or Marathon race. The calculator will calculate based on your previous running score for the next running competition. The forecasting calculator will give you information about possible future results quickly without complex analysis.
How to Predict Race Time
The timing of predicting your future race is based on a mathematical formula developed by Peter Rigel. The formula for predicting race times was first published in 1977 in Runner’s World Magazine. This formula has been approved and has been adopted for many years.
T₂=T₁x(D₂/D₁)1.06
where:
T₁ is the time achieved recently on distance D₁
T₂ is the predicted time for distance D₂
D₁ is the distance over which T₁ time was achieved
D₂ is the distance for which T₂ time is foreseen
FAQ about Race Predictor Calculator
🟥 In the “Distance” field, add the distance of the race that you ran.
🟥 In the second field “Known time” add the time for which you have overcome this race.
🟥 In the “Other distance” field, add the distance that you plan to run.
🟥 In the “Predicted time” field, the time for which you are supposed to run the future race distance will appear
The formula has the form:
T2 = T1 x (D2 / D1) 1.06
Where T1 is the set time, D1 is the set distance, D2 is the distance for which the time is predicted, and T2 is the calculated time for D2.
Race Predictor is a useful calculator for beginners and experienced runners who want to predict the results of their future races. For example, you ran 10 km on the basis of the time for which you ran this distance, you can calculate the estimated time at another distance, for example, a half marathon. Of course, the calculator will not be able to give the exact time because your pace in the race will be affected by your fitness, well-being and weather conditions, as well as the terrain of the track.