Prior to the early 1980s, all running events were run in yards. Since running event records exist in both meters and yards it is necessary to convert these earlier performances.

The basic procedure is that of interpolation, taking the following steps (I've also given an example below):

- 1. Convert the time into seconds (if appropriate).

- 2. Divide the time by a yard conversion factor (see table below).

- 3. Multiply the result from 2 (above) by the race distance, in meters.

- 4. Convert the time into minutes and seconds (if appropriate).

__Example__

Suppose a person runs the 100 yard dash in 12.1 seconds. Since the time
is only in seconds, we can skip step one above. The yard conversion
factor from the table below is 91.44. Dividing 12.1 by 91.44, we obtain
an answer of 0.1323272. Multiplying this answer by the race distance of
100 meters, and then rounding to the nearest tenth of a second, the final
time becomes 13.2. *Running a 100 yard dash in 12.1 is equivalent to
running a 100 meter dash in 13.2.*

__Calculating the yard conversion factor__

The yard conversion factor is simply the result of converting the distance
in yards into its equivalent distance in meters. *For example,* take
the distance of 100 yards. 100 yards is the same as 300 feet, which is
the same as 3600 inches. Since 1 inch equals .0254 meters, 3600 inches
equals 91.44 meters. That is, 100 yards is equal to 91.44 meters (making
91.44 the conversion factor for 100 yards).

The table below lists the yard conversion factors for each race.

Yard distance | Conversion
factor
(equivalent meter distance) |

100 yards | 91.44 meters |

110 yards | 100.584 meters |

220 yards | 201.168 meters |

330 yards | 301.752 meters |

440 yards | 402.336 meters |

880 yards | 804.672 meters |

1760 yards (1 mile) | 1609.344 meters |

3520 yards (2 mile) | 3218.688 meters |