diff --git a/README.md b/README.md
index 997e7cc8507f2a8ce744699b5f5b22adadd3bbfe..76156ae02229a3eba7a79c686900ad87c33480b3 100644
--- a/README.md
+++ b/README.md
@@ -12,3 +12,13 @@ This device produces around 0.1 volts/amp out of the sensor (or ~1 mV per Watt t
 Below, we see the flux guides registered into pockets on the pcb. 
 
 <img src='img/bc832-watt-0.jpg' width=40%>
+
+### Power requirements
+
+The nRF52832 draws 5mA peak @ 3.3V
+
+The Hall Effect Sensor draws xmA @ 3.3V
+
+Assume whole device runs at peak load for 10% of the time
+
+$$P=IV=5e-3*3.3*0.1=1.65mW$$
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