How to use the Energy Consumption Calculator
The Formula
kWh = (watts × hours per day × days) ÷ 1,000. Example: 1,500 W for 8 h/day over 30 days ≈ 360 kWh.
Practical Example
Multiply kWh by your utility rate in the Electricity Bill Estimator, or use the Vampire Power Cost Calculator for 24/7 standby loads and Appliance Daily Cost for single-day estimates.
About Energy Consumption Calculator
kWh formula
kWh = (watts × hours per day × days) ÷ 1,000. Example: 1,500 W for 8 h/day over 30 days ≈ 360 kWh.
Plan your bill
Multiply kWh by your utility rate in the Electricity Bill Estimator, or use the Vampire Power Cost Calculator for 24/7 standby loads and Appliance Daily Cost for single-day estimates.
Frequently asked questions
Q: Should I use nameplate watts? A: Use measured or average draw when possible—nameplate is often higher than real use.