# Timerhub Conversion of Marks from Metric to Imperial

When field series are entered in metric, Timerhub converts the values to Imperial units (i.e., feet-inches). The method used for the conversion is generally described in the Big Gold Book (Track & Field News. 2017. Big Gold Book. Tafnews Press. 187pp.). The converted value is controlled by a rounding offset (which depends on the event). That means the same measurement in meters may convert to a different Imperial value depending on the event.

For pole vault and high jump, the Gold Book suggests a rounding offset of 0.2 cm. For long jump, triple jump, discus, hammer, javelin, weight throw, and shotput the Gold Book recommends 0.499cm as the offset. Distances measured are recorded to the nearest lesser centimeter (that is, fractions less than one centimeter are ignored). Vertical jumps can be read more precisely (off a rule or tape) hence the smaller offset.

For vertical jumps:

1. Add 0.002m (0.2cm) offset to measurement in m.
2. Multiply the value (from #1) times 3.2808399 ft per m (1" = 2.54cm).
3. Convert to decimal feet to feet and remaining inches.
4. Any fractional inches are round down to nearest quarter inch.

For long jump, triple jump, weight throw, and shot put:

1. Add 0.00499m (0.499cm) offset to measurement in m.
2. Multiply the value (from #1) times 3.2808399 ft per m.
3. Convert to decimal feet (from #2) to feet and remaining inches.
4. Any fractional inches are round down to nearest quarter inch.

For hammer, javelin, and discus:

1. Add 0.00499m (0.499cm) offset to measurement in m.
2. Multiply the value (from #1) times 3.2808399 ft per m.
3. Convert to decimal feet (from #2) to feet and remaining inches.
4. Any fractional inches are round down to nearest full inch.

These conversions compare favorably with the conversion by HyTek Meet Manager and the USATF website.