Electricity Cost Calculator
Choose an appliance scenario, then enter actual power, operating hours and your own electricity tariff. Zero power, hours or tariff is valid.
Illustrative appliance power
Advanced settings
Energy = watts ÷ 1000 × hours. Cost = kWh × your tariff. Monthly results use your selected 1–31 days; yearly results use 365 identical days, not 12 selected months.
Enter a nonnegative decimal, up to 16 digits and 6 decimal places. No grouping or exponent; point decimals and locale comma decimals are supported. Hours must be 0–24. Days must be a whole number from 1 to 31. Power ≤10,000,000 W and tariff ≤1,000,000 per kWh.
Result
- Daily
- Monthly
- Yearly
Exact arithmetic, rounded only for display: costs to 2 decimals, other values to 3 (unit cost to 4); ≈ marks rounding. Currency is a label, with no exchange or billing rule.
Presets are illustrative wattages, not measured appliance consumption. Refrigerators and air conditioners cycle; use average effective hours or measured kWh. This is energy-only cost, excluding standing charges, tiers, taxes and time-varying tariffs.
Method and limits
Energy = watts ÷ 1000 × hours. Cost = kWh × your tariff. Monthly results use your selected 1–31 days; yearly results use 365 identical days, not 12 selected months.
Presets are illustrative wattages, not measured appliance consumption. Refrigerators and air conditioners cycle; use average effective hours or measured kWh. This is energy-only cost, excluding standing charges, tiers, taxes and time-varying tariffs.
Exact arithmetic, rounded only for display: costs to 2 decimals, other values to 3 (unit cost to 4); ≈ marks rounding. Currency is a label, with no exchange or billing rule.
Calculations stay in the page, with no calculator storage. Copy sends the current valid summary after your action; normal site scripts may load.
Copied
Copy failed. Select the result and copy it manually.
About Electricity Cost Calculator
Choose an appliance scenario, then enter actual power, operating hours and your own electricity tariff. Zero power, hours or tariff is valid.
1000 W × 2 h/day = 2 kWh/day. At 0.20/kWh: 0.40/day; 60 kWh and 12 for 30 days; 730 kWh and 146 for 365 days.
Hours must be 0–24. Days must be a whole number from 1 to 31. Power ≤10,000,000 W and tariff ≤1,000,000 per kWh.
Use Cases
How to use
Energy = watts ÷ 1000 × hours. Cost = kWh × your tariff. Monthly results use your selected 1–31 days; yearly results use 365 identical days, not 12 selected months.
Hours must be 0–24. Days must be a whole number from 1 to 31. Power ≤10,000,000 W and tariff ≤1,000,000 per kWh.
Pro Tips
- Presets are illustrative wattages, not measured appliance consumption. Refrigerators and air conditioners cycle; use average effective hours or measured kWh. This is energy-only cost, excluding standing charges, tiers, taxes and time-varying tariffs.
Frequently Asked Questions
The annual scenario always uses 365 days. Twelve 30-day months cover 360 days; both are estimates with explicitly different durations.
Only as a starting scenario. Rated power is not average continuous consumption; cycling and actual use matter. Prefer measured energy and include your bill’s other charges separately.