Type of calculation: Calculating the value after a percentage decrease.
How to use the calculator: Option 1 (Direct way): Use the
Value Decrease Calculator ("Calculate new value after percentage decrease"). Enter the old bulb's watts
60 W [Original] and the percentage saved as
80% [Decrease]. It will show you the LED's wattage directly.
Option 2 (Step-by-step): Step 1: Calculate the energy savings. Use the
Basic Percentage CALCULATOR ("What is X% of Y?"). Enter the percentage saved as
80 [X] and the old bulb's watts as
60 [Y]. It will calculate
80% of
60 W.
Step 2: Subtract those savings from the old bulb's wattage.
The formula:
We want to find the LED wattage, which is
80% less than the
60 W used by the old bulb.
Savings =
80% of
60 W
Savings = (
80 / 100) ×
60 W =
0.8 ×
60 W
= 48 W
LED watts = Old bulb watts - Savings
LED watts =
60 W -
48 W
= 12 W