Girth of tree in feet and inches 6ft 2ins 6ft 7ins 8ft 3ins 10ft 4ins

12ft   4ins 14ft   5ins 16ft   6ins 18ft 7ins 20ft   8ins 22ft   8ins 24ft   9ins 26ft 9ins 28ft 10ins

30ft 11ins 32ft 11ins

Girth of tree in metres and centimetres 1m 85cm 1m 98cm 2m 48cm 3m 10cm

3m   70cm 4m   33cm 4m   95cm 5m 58cm 6m   20cm 6m   80cm 7m   43cm 8m   03cm 8m 65cm

9m 28cm 9m.88cm

Equals Estimated age in years 75 80 103 138

1  8  1    2  3  2    2  9  1    3  5  8    433 5  1  5    6  0  6    7  0  4    810

924 1046

Historical connections 1930, George V Amy Johnson’ s solo flight to  Australia 1926, George V Year of the General Strike 1903, Edward VII First manned flight by the Wright Brothers 1868,Victoria Thomas Edison patented his 1st invention, an electric voice machine 1825, George IV Stockton to Darlington Railway opens (1st in the world) 1815, George III British victory over Napoleon at the Battle of Waterloo 1715, George I First Jacobite rebellion in Scotland 1638, Charles I Last year of the English Civil War 1573, Elizabeth I The first maps in England were made by Christopher Saxton 1491, Henry VII The future King, Henry VIII born at Greenwich 1400, Henry IV Rebellion in Wales under Owain Glyndwr 1302, Edward I Dante is exiled from Florence 1196, Richard I According to legend, Prince Madog of Gwynedd reached North America 1082,William the Conqueror Completion of Rochester Cathederal 960, Edgar Mieczyslaw I becomes first ruler of Poland

Ready Reckoner for estimating the age of an oak tree

NB These estimates are based on measurements by John White on oaks growing in open conditions in the south-east of England. Ages will vary for trees growing in different conditions and in other parts of the UK.