The frequency received by the observer will be higher than the source transmitted frequency when the light source travels in the direction towards the observer. This causes a shift and it is called as blue shift. This page shows the Doppler effect blue shift frequency formula which allows you to calculate the blue shift frequency by multiplying the emitted frequency with the fraction value of velocity and speed added by 1.
The above Doppler effect of blue shift frequency formula in this page will be useful for the high-grade school physics students to practice. Also, you can use the above calculator link for ease calculations.
Calculator 
Formula 
