Histórico da Página

The calculation of the variation in CDI accrued between periods is executed according to the following formula,

where:

                C = Product of the rates DI-CETIP Over using the percentage highlighted, from the initial date (included)
 up to the final date (exclusive), calculated with the rouding of 8 (eight) decimal places.

...

 TDI K = DI K , where: k = 1, 2, ..., n

           3000

Example:

k-1 = (1+TDI * (p/100) de k -1. Except when k=1, once the multiplier is 1. 

Multiplying K for CDI balance, the updated value is presented (interests included). Subtracting the balance of the updated value, the amount presented is the interest. 

...

For the CDI rates published after 1/1/98, the formula must be:

...

 TDI K =( DI K + 1) 1/252,  where: k = 1, 2, ..., n

             100

Example:

Multiplying K for CDI balance, the updated value is presented (includes interests). Subtracting the balance of the updated value, the amount presented is the interest. 

Fonte: www.cetip.com.br