LED savings calculator
Compare the running cost of old bulbs and LEDs and see your yearly saving.
Related tools
All Electronics tools →Enter Old bulb (W), LED bulb (W), Hours per day, Number of bulbs, Price per kWh and the LED savings calculator works out Old bulbs cost/year, LED cost/year, Yearly saving straight away. For instance, with Old bulb (W) = 60, LED bulb (W) = 9, Hours per day = 5, Number of bulbs = 10 and Price per kWh = $0.20 it returns Old bulbs cost/year = $219.00, LED cost/year = $32.85 and Yearly saving = $186.15.
How to use it
- Enter your values: Old bulb (W), LED bulb (W), Hours per day, Number of bulbs, Price per kWh.
- Read the result instantly: Old bulbs cost/year, LED cost/year, Yearly saving.
Frequently asked questions
How does the LED savings calculator work?
It takes Old bulb (W), LED bulb (W), Hours per day, Number of bulbs and Price per kWh and derives Old bulbs cost/year, LED cost/year and Yearly saving from them. The calculation is live as you type, so the result updates on every change.
Which values does the calculator ask for?
5 values: Old bulb (W), LED bulb (W), Hours per day, Number of bulbs and Price per kWh ($). Nothing else is required — no account, no file upload.
What does a typical calculation look like?
With Old bulb (W) = 60, LED bulb (W) = 9, Hours per day = 5, Number of bulbs = 10 and Price per kWh = $0.20, the calculator returns Old bulbs cost/year = $219.00, LED cost/year = $32.85 and Yearly saving = $186.15. Those figures come from running this exact tool, so you can reproduce them by entering the same values.
How much does the result change with different inputs?
It moves a lot. Using Old bulb (W) = 120, LED bulb (W) = 18, Hours per day = 10, Number of bulbs = 20 and Price per kWh = $0.40 instead, Old bulbs cost/year goes from $219.00 to $3,504.00 — which is why it is worth testing a few scenarios rather than trusting a single figure.
What does it give for smaller values?
Scaled down to Old bulb (W) = 30, LED bulb (W) = 5, Hours per day = 2.5, Number of bulbs = 5 and Price per kWh = $0.10, Old bulbs cost/year comes out at $13.69. The relationship is worth checking at both ends before you rely on a single result.
When would I actually use this?
At the bench: sizing a resistor for an LED, reading a colour band, working out a divider ratio, and checking a part will not cook.
What is the most common mistake?
Choosing a resistance and forgetting the power rating. A value that is electrically right will still burn if the package cannot dissipate what passes through it — check the watts as well as the ohms.
What is the difference between the LED savings calculator and the LED resistor calculator?
This one returns Old bulbs cost/year and LED cost/year; the LED resistor calculator returns Resistor (Ω) and Resistor power (W). That is the whole difference — open the one whose figure you need.
Is there a tool for the next step?
Heat pump savings calculator is the closest one after this: What a heat pump costs to run against your current boiler, from your own fuel bill: the heat you actually need, the electricity a given SCOP would draw, the yearly difference and the payback. Plus the one number that decides it — the electricity price above which the heat pump stops being cheaper.
Where do the figures come from, and how current are they?
Ohm's law and the divider formulas are exact. Colour bands follow the IEC standard; real components carry a tolerance, so a nominal value and a measured one will not match exactly.