Below are some energy saving examples calculating the total energy saving (in kWh), the reduction of CO₂ (in kg) and the Return on Investment (%). Simply fill out the text boxes with your required details and compare the results. You'll soon discover the benefits of investing in energy saving solutions!

Bulb comparison calculator

Your requirements		Energy rate
# of light bulbs		kWh to kgCO2 factor
Hours usage per Day		Cost of Electricity in £ per kWh
Days usage per Week
Weeks usage per Year
	Incandescent Lamp	Compact Flourescent Lamp (CFL)	Light Emitting Diode (LED)
Lamp details
Life Span (in hours)	h	h	h
Lamp Wattage	W	W	W
Cost of Product (£)
kWh of electricty used over 60k hours	3600	840	360
Electricity Cost (@ Rate per kWh)	396.00	92.40	39.60
Bulbs needed for 60k hours of usage	40	6	1
Equivalent 60k hour bulb expense	20.00	9.00	30.00
Total 60,000 Hour Lighting Spend	416.00	101.40	69.60
Yearly energy savings
kWh used per year	108000	25200	10800
Electricity Cost  in £ (@ Rate per KWh)	11880.00	2772.00	1188.00
Tonnes of CO2 emissions per year	58.4	13.6	5.8
Total energy saved by replacing (kW)	0.0	23.0	27.0
Energy saved per year (kWh/year)	0	82800	97200
Energy cost savings per year (£)	0.00	9108.00	10692.00
Lifetime energy cost savings
Payback on Energy Consumption (years)	0.00	0.08	1.40
Return on Investment (ROI) %	0.00	1250.00	71.43