SpecCalc Hub · Estimate
Electricity Cost Calculator
Calculate electricity cost from known kWh, or estimate consumption from appliance power and time. Enter your own flat tariff and currency.
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Formula
known consumption: energy_kwh = known_energy_kwh power mode: energy_kwh = (power_w / 1000) * hours_per_day * days cost = energy_kwh * tariff_per_kwh power mode only: average_daily_cost = cost / days
Assumptions
- Inputs are user-provided.
- Results are preliminary estimates.
- In power mode, the appliance draws the entered power throughout the entered operating hours.
- Tariff is flat.
Limitations
- Variable loads and time-of-use pricing are not modeled.
- Taxes, demand charges, and fees are not included.
Sources / methodology
Use measured energy directly, or calculate kWh = kW × operating hours. Cost = kWh × the entered flat tariff.
- Formula version
- 1.1.0
- Formula review date
- 2026-09-15
Source links
Quick answer: This electricity cost calculator estimates kWh use, monthly appliance cost and tariff-based energy spend from power, runtime, days and currency. It is useful for queries such as how much 137 kWh costs, but the final bill can still differ because tariffs, taxes, fixed fees and time-of-use rules vary.
Input parameters
- What do you know?: Appliance use and time
- Power (W): 1,000 W
- Hours per day (h/day): 2 h/day
- Days (days): 30 days
- Tariff per kWh (/kWh): 0.15 USD/kWh
- Currency: USD
Output values
- Energy (kWh)
- Cost
- Average daily cost
Step-by-step example
Calculation for the example inputs shown above:
- E = 1,000 ÷ 1000 × 2 × 30 = 60 kWh
- Cost = 60 × USD 0.15/kWh = USD 9.00
- Daily average = USD 9.00 ÷ 30 = USD 0.30
One flat tariff. Fixed charges, taxes and tiered rates are not added automatically.
How to calculate electricity cost from watts and hours
Convert watts to kilowatts, multiply by hours and days to get kWh, then multiply by tariff. That makes the page useful both for quick bill questions and for checking how one appliance affects monthly energy use.
Electricity cost table for common kWh amounts
There is no universal electricity price because the result always depends on tariff. The table below uses example tariffs only. For your real estimate, multiply the energy amount by your own price per kWh and keep taxes, fixed fees and time-of-use adjustments separate.
| Energy | Cost at 0.10/kWh | Cost at 0.15/kWh | Your tariff formula |
|---|---|---|---|
| 1 kWh | 0.10 | 0.15 | 1 x tariff |
| 10 kWh | 1.00 | 1.50 | 10 x tariff |
| 50 kWh | 5.00 | 7.50 | 50 x tariff |
| 100 kWh | 10.00 | 15.00 | 100 x tariff |
| 137 kWh | 13.70 | 20.55 | 137 x tariff |
| 250 kWh | 25.00 | 37.50 | 250 x tariff |
| 1000 kWh | 100.00 | 150.00 | 1000 x tariff |
Worked example: 2000 W heater cost
A 2000 W heater running 8 hours per day for 30 days uses 480 kWh. At 1000 UZS/kWh, the estimated cost is 480,000 UZS before any taxes or fixed utility charges.
Monthly appliance electricity cost examples
The same method works for lamps, heaters, pumps, chargers or any other load with a known average wattage. Treat duty cycle carefully for appliances that cycle on and off instead of drawing full power all day.
| Load | Typical use | Energy | Estimated cost at 0.15/kWh |
|---|---|---|---|
| 60 W lamp | 5 h/day for 30 days | 9 kWh | 1.35 |
| 150 W appliance | 8 h/day for 30 days | 36 kWh | 5.40 |
| 2000 W heater | 8 h/day for 30 days | 480 kWh | 72.00 |
Why your utility bill can differ from the calculator
This page calculates the energy-charge layer only. Your real bill can still change because of taxes, fixed service charges, tiered pricing, time-of-use windows, demand charges, minimum fees or meter-rounding rules.
UZS tariff example
If you select UZS and enter 1000 UZS/kWh, a 2000 W heater running 8 hours per day for 30 days still uses 480 kWh, but the cost output becomes 480,000 UZS. This is the same energy math expressed in the selected tariff currency.
Worked examples
Worked example with the form defaults
Example inputs: What do you know?: Appliance use and time; Power: 1,000 W; Hours per day: 2 h/day; Days: 30 days; Tariff per kWh: 0.15 USD/kWh; Currency: USD. E = 1,000 ÷ 1000 × 2 × 30 = 60 kWh. Cost = 60 × USD 0.15/kWh = USD 9.00. Daily average = USD 9.00 ÷ 30 = USD 0.30. One flat tariff. Fixed charges, taxes and tiered rates are not added automatically.
Alternative calculation scenario
Example inputs: What do you know?: Consumption in kWh; Consumption for the period: 137 kWh; Tariff per kWh: 0.15 USD/kWh; Currency: USD. E = 137 kWh. Cost = 137 × USD 0.15/kWh = USD 20.55. One flat tariff. Fixed charges, taxes and tiered rates are not added automatically.
What the result does not establish
The tariff is entered by you. A single-rate estimate excludes fixed fees, taxes and consumption tiers unless you have explicitly included them in the effective tariff; example prices are not current official tariffs.
Common mistakes
- Do not confuse watts (power) with kWh (energy).
- Keep the tariff and selected currency aligned.
- Add taxes, fixed fees, tiered pricing and time-of-use charges separately when they apply.
What to check next
Check the inputs, limitations, sources and related calculators before using the estimate in a real decision.
FAQ
How much does 137 kWh cost?
Multiply 137 kWh by your tariff. At 0.10 per kWh it is 13.70, at 0.15 it is 20.55, and at 0.20 it is 27.40 before any taxes or fixed fees.
Why do electricity costs depend on tariff?
Because kWh is only energy volume. Cost appears only after multiplying that energy by the applicable price per kWh.
How do I calculate electricity cost from watts?
Convert watts to kilowatts, multiply by operating hours and days to get kWh, then multiply by tariff. The page shows each step so the estimate can be checked.
Why might my bill be higher than the calculator result?
Because the page estimates only the energy-charge layer. Your utility bill can also include taxes, fixed fees, tiered pricing, time-of-use adjustments, demand charges or minimum-service charges.
Can I use this calculator for any currency?
Yes. Select USD, EUR, UZS or Custom and keep the tariff value aligned with the selected currency.
Can I enter a tariff like 1000 UZS per kWh?
Yes. Select UZS and enter the tariff in UZS per kWh, for example 1000, so the result stays aligned with the selected currency.
Does this include taxes or fixed charges?
No. The page estimates energy cost only and does not include taxes, fixed fees, demand charges or time-of-use adjustments.
Related calculators
This calculator provides an estimate for informational purposes only. It is not a certified engineering design, electrical safety approval, or professional installation recommendation. Always verify final decisions with a qualified professional and applicable local codes.