How to use the inventory
- Walk through the house room by room and add each appliance, including always-on items such as the router, CCTV, water dispenser and fridge.
- Enter watts from the label, manual or energy label. For cycling appliances, use an average (see the refrigerator FAQ below).
- Estimate hours per day and days per month honestly — this matters as much as the wattage.
- Enter your rate: divide the total on your bill by its kWh.
- Compare the total kWh with your bill. If they’re close, the ranking shows where to focus. If not, revisit hours and missing items.
Formulas
Monthly kWh (each) = watts ÷ 1,000 × hours/day × days/month × quantity
Share of total (%) = appliance monthly kWh ÷ total monthly kWh × 100
Monthly cost = monthly kWh × rate
Annual cost = monthly cost × 12Example (estimate). The example list (two 60 W fans for 8 h, a 100 W TV for 5 h and a 10 W router all day, for 30 days) totals about 50 kWh a month. Adding a 900 W aircon for 8 hours a night would add 216 kWh — more than four times everything else combined. In many Philippine homes, cooling is the first place to look.
Your privacy
Calculations run entirely in your browser. Your list is saved in your browser’s local storage on this device only, and you can delete it at any time with “Clear list” or by clearing your browser data. We never receive it.
Your electricity rate
The calculator starts with an example rate of ₱15.06 per kWh. That is Meralco’s announced overall rate for a typical household using 200 kWh a month in October 2026 (₱15.0615/kWh), as reported by The Philippine Star on 14 October 2026.
Limitations
- Every appliance is assumed to draw its entered wattage whenever it is on.
- A single average rate is applied to all kWh.
- The ranking is only as good as the hours you enter. A plug-in energy meter gives better numbers for big users.
Ready to cut the biggest items? Read practical ways to reduce household electricity consumption.