Relative savings uncertainty calculator

An uncertainty small relative to total use can still be large relative to the savings signal.

U_{\text{rel}} = \frac{U_{\text{abs}}}{S} \times 100

Calculator

Enter the values you know and leave one box empty. Calculate finds the empty one, the result or any input.

Given

U_{\text{rel}} = \frac{6000}{40{,}000} \times 100 = 15

Symbol	Meaning	Unit
$U_{\text{rel}}$	uncertainty relative to savings	%
$U_{\text{abs}}$	absolute savings uncertainty	kWh
$S$	estimated savings	kWh

Results are estimates for study and screening. Check the inputs, units and assumptions before you use them for design, billing or contract decisions.