Energy Saving Calculator

Energy saving calculator

Enter your existing luminaires and the products you are considering. Figures update as you type. Every row is one like-for-like replacement, so quantity, running hours and days carry across to the proposed column.

1 Luminaire schedule

#	Existing					Proposed			Actions
#	Area / type	Qty	Watts each	Hours / day	Days / year	Product	Watts each	Saving / year	Remove
	Totals					—

+ Add luminaire

2 Costs and assumptions

Electricity tariff £/kWh

Project cost supply, install, disposal

Existing maintenance lamps, gear, labour per year

Proposed maintenance per year, after replacement

Energy price inflation per year

CO₂ factor kg CO₂e/kWh

3 Your estimate

Annual saving —

Payback — simple, on project cost

CO₂ avoided — kg per year

Net position, year 5 — after project cost

Annual comparison

Existing energy use	—
Proposed energy use	—
Existing energy cost	—
Proposed energy cost	—
Maintenance saving	—
Total annual saving	—

Cumulative position over 5 years

Year	Saving	Cumulative	Net of project cost

4 Take it away

Project or site prints on the report

Prepared for optional

Reference optional

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Please read: This calculation is an indicative estimate only, produced from the figures entered above. It is not a lighting design, an electrical survey, or a guarantee of performance or savings. Actual results will vary with site conditions, control strategy, occupancy, tariff changes and installation quality. These figures must be reviewed and verified by a qualified lighting specifier or competent electrical engineer before being relied on for specification, procurement or financial decisions.