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Electricity Bill Calculator

Estimate monthly household energy costs with support for tiered pricing structures. Features a daily breakdown and currency conversion.

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About

Household utility bills are rarely simple linear calculations. Most energy providers utilize tiered pricing structures where the cost per kilowatt-hour (kWh) increases after a certain usage threshold is crossed. Predicting the final monthly statement requires accounting for these steps, rather than applying a single flat rate to the entire consumption.

This calculator handles the complexity of tiered billing. It segments your total usage into base-rate and premium-rate blocks, providing a granular estimation of costs. A daily breakdown is included to help visualize the "burn rate" of your household energy, making it easier to identify if your daily habits align with your monthly budget targets.

energy bill utility calculator kWh cost tiered pricing electricity estimator

Formulas

The cost calculation uses piecewise logic to apply different rates based on usage thresholds.

Ctotal =
{
U × R1 if U ≤ LL × R1 + U − L × R2 if U > L

Where:

  • U: Total Usage (kWh)
  • L: Tier 1 Limit (e.g. 500 kWh)
  • R1: Rate for Tier 1
  • R2: Rate for Tier 2

Reference Data

Household TypeAvg. Monthly Usage (kWh)Est. Cost @ 0.15 $/kWh
Studio Apartment250 - 400$37 - $60
1-Bedroom Apt400 - 600$60 - $90
2-Bedroom Apt600 - 850$90 - $127
Townhouse (3 BR)900 - 1200$135 - $180
Large House (4+ BR)1500 - 2500$225 - $375
Electric Heat Add-on+500 - 1000+$75 - $150
EV Charging (Daily)+300 - 500+$45 - $75

Frequently Asked Questions

Tiered pricing is a billing method where the first block of energy you use (e.g., 500 kWh) is charged at a lower "Baseline" rate, and any usage above that limit is charged at a higher "Tier 2" rate. This encourages energy conservation.
Check your latest utility bill. Look for "Generation Charges" and "Delivery Charges." You should add these together and divide by your total kWh usage to get your effective "all-in" rate per kWh, or simply look for the specific rate line items.
This tool calculates the usage-based portion of your bill. Most utilities add a fixed "Connection Fee" or "Customer Charge" (often $10-$20) plus local taxes, which are not included in this raw usage calculation.
Viewing costs daily helps contextualize the expense. Knowing your house burns $5.00 a day can help you measure the impact of turning off AC or heating for a single day.