Singapore Electricity Calculator Singapore Electricity Calculator Electricity Units Consumed (kWh) ℹEnter the number of kWh consumed this month. Tariff Rate (SGD per kWh) ℹEnter your electricity tariff rate per kWh. Fixed Monthly Charges (SGD) ℹEnter any fixed monthly electricity charges. Calculate Bill Reset Estimation only. Actual electricity bill may vary depending on provider and season. Your estimated electricity bill will appear here Enter consumption, rate, and charges, then click Calculate.