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Calculate Your Monthly Electric Bill

Built by Kevin Glover · @gloverbuilds · Verified formula

Estimate your monthly electricity bill from appliance usage. Find what is driving your bill up.

📅 Updated April 2026 ✅ Formula verified 📖 4 min read 🆓 Free · No sign-up

In this article

What Drives Your Electric Bill
Biggest Savings Opportunities

Maiores Consumidores no Brasil

Chuveiro elétrico: 25-30% da conta. Ar-condicionado: 20-30%. Geladeira: 10-15%. A conta média residencial brasileira: R$200-500/mês. Com bandeira tarifária vermelha: +R$50-100. O chuveiro elétrico é o vilão #1 da conta de luz brasileira — sem equivalente em outros países.

Como Reduzir

Chuveiro: reduza 2 min por banho = R$20-40/mês. LED: R$30-50/mês de economia. AC inverter: 40-60% menos que convencional. Bandeira vermelha: desligue o que puder.

⚡ CalcWolf Insight

The cheapest electricity is the electricity you do not use. Sealing air leaks (weatherstripping doors and caulking windows) costs $20-50 in materials and can reduce HVAC costs by 10-20%. This is the highest-ROI home improvement project possible — $20 investment saving $100-200/year.

Frequently asked questions

Qual aparelho gasta mais?▾

Chuveiro elétrico: 25-30%. AC: 20-30%. Geladeira: 10-15%.

Como saber o consumo real?▾

Medidor de energia na tomada (R$30-60) mostra watts em tempo real. Multiplique por h/dia × 30 × tarifa.

✓ Math logic verified against primary sources → See our verification process

Kevin Glover · @gloverbuilds

Founder, CalcWolf · GLVTS · Blickr

All formulas sourced from primary references — IRS publications, peer-reviewed research, and official standards. Results are tested against independent reference calculators before publishing. Rates and brackets updated when official sources change. Editorial policy →