LED bulb savings
How much you save by switching bulbs, and how quickly the LEDs pay for themselves.
How it works
kWh saved = bulbs × (old W − LED W) × hours × 365 / 1000. Payback = LED cost / yearly savings.
Results are for guidance only and do not replace professional advice.
Worked example
With the default values:
- Number of bulbs12
- Old bulb wattage (W)60
- LED wattage (W)8
- Hours on per day4
- Price per kWh0.32
- Price per LED4
you get:
- Savings per year€291.53
- kWh saved per year911 kWh
- Cost of the LEDs€48.00
- Pays back in2 months
Frequently asked questions
How does the “LED bulb savings” tool work?
kWh saved = bulbs × (old W − LED W) × hours × 365 / 1000. Payback = LED cost / yearly savings.
What do I need to enter?
Just fill in: number of bulbs, old bulb wattage, led wattage, hours on per day, price per kwh, price per led. The result updates as you type.
Can you give an example?
Number of bulbs: 12; Old bulb wattage (W): 60; LED wattage (W): 8; Hours on per day: 4; Price per kWh: 0.32 → Savings per year: €291.53; kWh saved per year: 911 kWh.
Is this calculator free, and is my data private?
Yes. HOD Calc is completely free with no sign-up. The calculation runs in your browser: nothing you type is sent or stored.