Competition - Results and winners

We congratulate our winners!

Julia's throw of the 1 kg mass standard was 77.28952 m compared to 62.78426 m with the 4 kg Hammer.

Thank you to everyone that took the time to enter the competition.

Our Major Prize winner was Gavin Tasker from IANZ who had the closest guess and attended one of our Roadshow events with a guess of 75.55555 m.

The Minor Prize winner is JoAnn Eggers who had the closest guess with 76.910169 m.


(external link)

For the result of Julia's 1 kilogram throw click here to watch part two.

Analysis of results

Any science competition must have some statistical analysis in it along the way, and this one is no different, so our scientists have analysed the results. People were given the value for how far Julia could throw the 4 kg weight. (62.78 m) and then asked to guess how far she could throw a 1 kg weight. Only one person thought the 1 kg wouldn't go as far as the 4 kg. There were some wild guesses (500 m). Most guesses were within 15 m (20 %) of the actual value (77.29 m).

To put all this into context we have mapped Julia's Personal Bests with each weight compared to the 1 kg mass standard.


So what was this competition about?

Click to watch the video(external link)

To celebrate the newly redefined International System of Units, we enlisted Julia Ratcliffe, New Zealand’s Commonwealth gold medallist hammer thrower for the job of throwing the MSL’s 1 kilogram mass standard away! Julia normally throws a 4 kilogram hammer, so how far can she throw our 1 kilogram mass standard hammer? Below were the results from the 4 kg hammer throw which averaged 62.78426 m and we challenged you to guess how far Julia could throw the 1 kilogram mass standard.



Distance – throw 1

 60.81322 m

Distance – throw 2

 62.91662 m

Distance – throw 3

 62.64843 m

Distance – throw 4

 64.75877 m

Mass of 4kg hammer plus handle

4000.43 g


21.8 °C

Relative Humidity

69.7 %


101.4 kPa

UV index


Wind speed


*Standard Wellington Gust



New Zealand’s primary kilogram was not actually used in the production of this video and sits safe and sound in a vault at the Measurement Standards Laboratory. No scientists’ brains were used in the production of any measurement uncertainty budgets for the results obtained during the promotional stunt. These results should not be relied upon for anything other than the purpose for which they were obtained.