According to the Japan Times, the estimated figure represents a cumulative total from 2013, the year Tokyo was chosen to stage the 2020 Olympics and Paralympics, to 2030.

It is made up of effects of legacy, such as the use of competition venues, including the Olympic Village, after the Games.

The amount includes ¥5 trillion (£35 billion/$44 billion/€41 billion) in what is described as direct effects and ¥27 trillion (£194 billion/$237 billion/€224 billion) in indirect effects. 

Around ¥20.7 trillion (£148 billion/$182 billion/€172 billion) of the figure will provide benefits purely to the host city itself, while the Metropolitan Government are hoping the Olympics will create nearly two million jobs.

Job creation, an increase in tourism, and investments to build and upgrade facilities are expected to be the main areas of benefit for the nation, according to the Metropolitan Government.

In December, the Tokyo 2020 Organising Committee unveiled a budget of between ¥1.6 trillion (£11.4 billion/$14 billion/€13.2 billion) and ¥1.8 trillion (£13 billion/$15.8 billion/€14.9 billion).

It was down from the the maximum budget cap of ¥2 trillion (£13.8 billion/$17 billion/€16.4 billion) cited by Tokyo 2020 President Yoshirō Mori the previous month.

Tokyo Governor Yuriko Koike warned last month, however, that the budget could still spiral to as much as ¥3 trillion (£21.5 billion/$26.3 billion/€24.8 billion).

In an interview with Agence France-Presse, Koike admitted they did not yet have a "final figure for how much it will cost".

She conceded the budget may eventually grow to four times the initial estimate.

Last year, a taskforce commissioned by Koike recommended switching rowing, swimming and volleyball to different venues in a bid to cut costs.