Enter voltage, phase, power factor, and appliance quantities. Review connected load, demand load, and current. Export results, inspect trends, and size protection confidently today.
| Appliance | Qty | Watts Each | Duty % | Hours/Day |
|---|---|---|---|---|
| LED Lighting Circuit | 12 | 18 | 100 | 6 |
| Ceiling Fan | 6 | 75 | 90 | 10 |
| Air Conditioner | 2 | 1500 | 80 | 8 |
| Water Pump | 1 | 900 | 40 | 1 |
| Socket Circuit Allowance | 1 | 1800 | 60 | 5 |
This calculator estimates connected load, diversified running load, demand load, design load, current, and energy usage from one page.
It suits homes, small offices, workshops, retail spaces, server corners, and mixed appliance planning. It can also help prepare preliminary schedules before detailed design.
Duty cycle and demand factor reduce unrealistic totals. Continuous factor and spare capacity help you plan a more practical service size.
Use the results to compare appliance mixes, test voltage assumptions, estimate current draw, and prepare cleaner discussions with electricians or project teams.
Connected Load: Sum of (Quantity × Watts Each)
Diversified Running Load: Sum of (Quantity × Watts Each × Duty Cycle ÷ 100)
Demand Load: Diversified Running Load × Demand Factor ÷ 100
Design Load: Demand Load × Continuous Factor ÷ 100 × (1 + Spare Capacity ÷ 100)
Single Phase Current: Current = Design Load ÷ (Voltage × Power Factor)
Three Phase Current: Current = Design Load ÷ (1.732 × Voltage × Power Factor)
Daily Energy: Sum of (Diversified Watts × Hours Per Day) ÷ 1000
Monthly Energy: Daily Energy × 30
Breaker Guidance: Choose the next standard breaker size above the estimated current.
Electrical load is the power required by connected equipment. It is usually expressed in watts, kilowatts, volt-amperes, or current in amperes.
Connected load assumes everything can run together. Demand load applies a planning factor because real systems often operate with diversity and not all loads run at full intensity together.
Power factor affects current draw. The same real power can require more current when power factor is lower, especially for motors and inductive equipment.
Use three phase mode when the supply system is a three phase distribution system. It changes the current formula and better reflects larger commercial or industrial loads.
Some designs increase continuous loads for safer sizing. This helps account for long-duration operation and can improve breaker and feeder planning.
Yes, for early estimates. However, locked-rotor current, starting methods, harmonics, and manufacturer data should be checked before final equipment selection.
No. It is a planning guide only. Final breaker and conductor choices must match local code rules, ambient conditions, installation method, and equipment ratings.
Spare capacity supports future expansion and reduces the chance of undersizing. It is useful when occupancy, equipment count, or operating patterns may change later.
Important Note: All the Calculators listed in this site are for educational purpose only and we do not guarentee the accuracy of results. Please do consult with other sources as well.