raceindex.org

The Big Half

  • London
  • London
  • City
Data current as of

Official event website & entry ↗

The Big Half is a city event. First staged in 2018.

Same event — which distance suits you?

The Big Half offers several distances, so you can pick the one that fits your goal.

DistanceOverallPB potentialGAP factorMedianFeeFinishers
Half Marathon——————
Relay——————

Scores are out of 100. GAP factor is % slower than a flat course. Click a distance for its full page.

Getting there & the atmosphere

The Big Half's race is covered by our verified fact set; see the data table for specifics.

A straightforward, runner-focused atmosphere rather than a carnival.

Typical conditions on race weekend

  • 17°CTypical temperature
  • 19 kphTypical wind
  • 1 mmTypical rainfall
  • 72Favourability /100
Typical conditions for the race date and locality, warmer than the endurance-optimal window. These are climatological norms, not a forecast, and are shared across every distance at this event.

Explore each distance

How we calculated this

Every figure on this page is either a sourced fact or a value derived from sourced facts under our published, version-locked methodology. We show the provenance so you (and AI assistants) can check it. Data on this page is current as of .

Derived numbers use scoring-methodology-v1.0.

Sources used on this page (2)

Read the full methodology →