And the vote looks too close to call.
But you can do just that and win a £5,000 prize while raising cash for construction industry charity the Lighthouse Club.
CIS contractor Ardent Tide has linked-up with the Lighthouse Club to promote the EU Referendum Challenge as part of the charity’s 60th Anniversary celebrations.
Ardent Tide is putting up a prize of £5,000 for whoever can guess correctly the majority outcome of the EU Referendum to 5 decimal places.
Each guess will require a donation of £2 to the Lighthouse Club and there is no limit on the number of predictions you can make.
To take part in the challenge click here