Every kWh on your meter has a dollar value once you know your rate. This guide shows how to calculate electricity cost from kWh—usage from bills or appliance math, your utility $/kWh, and the energy charge before fixed fees and taxes.
Benefits
- Core formula: cost $ = kWh × $/kWh.
- Works for one appliance, one day, or a full billing period.
- Reverse check: kWh = energy cost $ ÷ $/kWh when validating a bill line.
How it works
- Total your kWh—meter reading, bill summary, or watts × hours ÷ 1,000.
- Multiply by your energy rate in $/kWh from the tariff or effective bill rate.
- Read energy cost in dollars—add fixed charges separately for the full statement.
FAQ
How do I calculate electricity cost from kWh?
Cost $ = kWh × $/kWh. Example: 320 kWh at $0.16/kWh → 320 × 0.16 = $51.20 energy charge. For a single load: 1.5 kWh (1,500 Wh) at $0.14/kWh → 1.5 × 0.14 = $0.21 per cycle.
How do I get kWh from appliance wattage?
kWh = watts × hours ÷ 1,000. A 1,500 W heater for 4 hours → 1,500 × 4 ÷ 1,000 = 6 kWh. Multiply by your $/kWh for that run's cost, or use Appliance Monthly Energy for recurring loads.
Can I calculate cost without my full bill?
Yes—if you know kWh and rate, energy cost is pure multiplication. You still need your utility's fixed customer charge, delivery rider, and taxes for the total amount due. This math isolates the variable energy portion you control with usage.
Technical specifications
- Energy cost $ = kWh × rate_$/kWh.
- kWh from watts = W × hrs ÷ 1,000.
- Effective $/kWh = energy_charge $ ÷ billed_kWh.
- Related: electricity-bill-estimator, appliance-monthly-energy, energy-consumption.