Linear Acceleration calculation

Dear,
I printed the accelration values as
accel: -0.031 -0.011 1.032
accel: -0.032 -0.011 1.032
accel: -0.028 -0.011 1.033
accel: -0.030 -0.011 1.034
accel: -0.031 -0.010 1.033
accel: -0.030 -0.010 1.033
accel: -0.031 -0.010 1.033
accel: -0.030 -0.011 1.033
accel: -0.030 -0.011 1.032
accel: -0.768 0.003 1.103
accel: -0.185 -0.038 1.081
accel: 0.112 0.013 1.097
accel: -0.108 -0.014 1.017
accel: 0.013 -0.017 1.042
accel: -0.063 -0.008 1.033
accel: -0.016 -0.020 1.033
accel: -0.008 0.001 1.029
accel: -0.079 -0.026 1.019
accel: -0.002 0.007 1.026
accel: -0.047 -0.032 1.035
accel: -0.011 0.006 1.032
accel: -0.035 -0.019 1.041
accel: 0.135 -0.012 1.075
accel: -0.111 -0.013 1.016
accel: 0.033 -0.012 1.023
accel: -0.044 -0.003 1.034
accel: -0.038 -0.034 1.035
accel: -0.030 0.022 1.036
accel: -0.056 -0.050 1.036
accel: 0.006 0.023 1.037
accel: -0.076 -0.048 1.033

I do not which FSR as you have discussed in the forum , I got mems sensor I didnt change any parameters since i dont have ARM board .
With these values could you tell me how to calculate the exact linear acceleration. I read from the post that i had subract the gravity , how do i get that gravity value.
viewtopic.php?f=3&t=737&start=10



Waiting for your reply eagerly for my progress.