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How Much Does Each Appliance Cost to Run?

Built by Kevin Glover · @gloverbuilds · Verified formula

Calculate your electricity cost by appliance — AC, washer, TV, computer, lights. See which devices are draining your wallet.

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

In this article

What Uses the Most Electricity?
How to Lower Your Bill
Understanding Your Rate

Custo por Aparelho

Fórmula: watts × horas/dia × 30 ÷ 1.000 × tarifa/kWh. Ar-condicionado (1.400W × 8h): ~R$100-150/mês. Geladeira (150W contínuo): ~R$25-40. Chuveiro elétrico (5.500W × 15min × 4 banhos): ~R$60-90. O chuveiro elétrico é o vilão da conta — sozinho pode ser 25-30% do total.

Como Reduzir

Chuveiro: reduza 1 minuto de cada banho = R$15-25/mês. LED: troque TODAS as lâmpadas = R$30-50/mês de economia. Ar-condicionado inverter: 40-60% mais eficiente. Bandeira tarifária vermelha: desligue o que puder. A tarifa média no Brasil (~R$0,70/kWh) é alta comparada a muitos países.

⚡ CalcWolf Insight

The Department of Energy estimates that phantom loads (standby power) account for 5-10% of residential electricity use — $100-200/year for the average household. A smart power strip ($25-35) that cuts power to idle devices pays for itself in 2-4 months.

Frequently asked questions

Qual aparelho gasta mais?▾

Chuveiro elétrico: 25-30% da conta. Ar-condicionado: 20-30%. Geladeira: 10-15%.

Quanto custa deixar a TV ligada o dia todo?▾

TV 55": ~150W × 24h = 3,6 kWh × R$0,70 = R$2,52/dia = R$75/mês. Não é enorme, mas os aparelhos em standby acumulam.

✓ 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 →