Range conversion to 3.3V

Question

MAX30003 has 18 bit ADC so i wanted to convert the value range of this ADC to 0-3.3Volts. I tried the formula below but still getting values bigger then 3.3. 
 double ecg = (sample*3.3)/(2^18 -1) do anyone know how to handle this?

Premchand · Accepted Answer

Here is answer
// Read three 8-bit buffers from FIFO

unsigned int data = (regReadBuff[0] << 16 | regReadBuff[1] << 8 | regReadBuff[2] & 0xc0) >> 6;

// Convert value to rage 0.0 to 3.3

float value = (((data * 3.3) / 131072) * 1000) / 20;

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Range conversion to 3.3V

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