The Prince of Wales is the "greatest charitable entrepreneur in the world", helping to raise £109m for good causes last year, according to his private secretary Sir Michael Peat.
The second annual review of the activities of Clarence House claims the prince's group of 16 "core" organisations, known collectively as the Prince's Charities, is the largest multi-cause charitable enterprise in the country.
The prince also donates £2.5m of his £13m income to charity each year.
"It is a sizeable proportion," said Peat.
He added that the prince acted as an entrepreneur, identifying a need and then setting up the charities to meet it.
Charles established all but two of the "core" charities himself, including the Prince's Trust. He is also the patron or president of 352 other organisations.