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Guide

Estimate Monthly and Annual Electricity Costs

Estimate monthly and annual electricity costs from daily kWh by category and your $/kWh rate. Plan home budgets, compare tariffs, and sanity-check utility bills.

Open the calculator →

Daily kWh is the input; monthly and annual dollars are what you pay. This guide shows how to estimate electricity costs over a month and a full year from category-level use and your utility rate.

Benefits

  • Rolls daily category kWh into monthly (~×30) and annual (~×365) totals automatically.
  • Applies your $/kWh rate to produce monthly and yearly cost in one view.
  • Useful for budgeting, solar payback checks, and before/after upgrade comparisons.

How it works

  1. Enter daily kWh for HVAC, water heating, kitchen, laundry, and other loads.
  2. Set your electricity rate—blended average or seasonal estimate from recent bills.
  3. Read monthly kWh, annual kWh, monthly cost, and annual cost from the calculator output.

FAQ

How do I estimate monthly electricity cost?

Sum daily kWh across categories, multiply by ~30 for monthly kWh, then multiply by $/kWh. Example: 55 kWh/day → ~1,650 kWh/month; at $0.15/kWh that is about $248/month before fixed utility charges.

How do I estimate annual electricity cost?

Annual kWh ≈ daily kWh × 365; annual cost ≈ annual kWh × rate. Seasonal HVAC swings mean a single winter-week estimate can under- or over-shoot—use category kWh tuned to each season when precision matters.

Does this include taxes and fixed fees?

The calculator shows energy charges (kWh × rate). Customer charges, demand fees, and taxes are added on your bill separately—treat this result as the variable energy portion you can shift with efficiency or load scheduling.

Technical specifications

  • Monthly kWh ≈ daily kWh × 30; monthly cost = monthly kWh × $/kWh.
  • Annual kWh ≈ daily kWh × 365; annual cost = annual kWh × $/kWh.
  • Inputs: five category kWh/day fields + positive rate.
  • Related: electricity-bill, appliance-monthly-energy, solar-payback-roi.

Monthly vs. annual framing

Budgeting and bill shock usually happen on a monthly cadence; solar ROI and efficiency upgrades often compare annual totals. The same daily kWh model feeds both—monthly uses a 30-day factor for quick planning, annual uses 365 for long-range comparisons.

Rate assumptions matter

A single blended $/kWh works for first-pass estimates. If your tariff has summer/winter tiers or time-of-use blocks, rerun with the rate that applies to most of your kWh in each season—or weight peak and off-peak separately once category schedules are known.