Everyday life

LED Savings Calculator

Find savings from switching to LED bulbs.

Old bulb wattage (W)

LED wattage (W)

Hours per day

Number of bulbs

Price per kWh ($)

Calculated Output

Annual savings ($) 139.61

Energy saved/year (kWh) 930.75

Formula: savings = (old − new)/1000 × hours × 365 × bulbs × price

Step-by-Step Breakdown

1. Values used:

2. Old bulb wattage = 60 W

3. LED wattage = 9 W

4. Hours per day = 5

5. Number of bulbs = 10

6. Price per kWh = 0.15 $

8. Annual savings = 139.61$

9. Energy saved/year = 930.75kWh

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The math behind it

savings = (old W − new W) ÷ 1000 × hours/day × 365 × bulbs × price per kWh.

10 bulbs, 60→9 W, 5 h/day, $0.15 → ~$140/year.

Bulb cost?

LEDs cost more upfront but pay back quickly in energy and longevity.