Barclays said adjusted second quarter pre-tax profit fell 17% to £3.6bn.
The share sale will be done as a rights issue, giving existing investors the opportunity to buy new shares so their stakes will not be diluted.
Barclays chief executive Antony Jenkins said the plans enabled the bank to maintain its planned level of lending growth.
'I am certain the decisive and prompt action we are taking will leave Barclays stronger', he added.
Barclays' move comes after the banking regulator - the Prudential Regulation Authority (PRA) - issued tough new capital requirements aimed at ensuring banks are protected from the risk of investment losses, even in the event of a fresh financial crisis.
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