Plan circuits with confidence. Estimate demand, current, energy, and protection. Clean inputs support faster decisions for safer electrical system sizing.
Enter project details and up to six load items. Results appear above this form after submission.
| Equipment | Qty | Rated W | Hours/Day | PF | Demand Factor | Efficiency % |
|---|---|---|---|---|---|---|
| LED Lighting | 20 | 18 | 10 | 0.95 | 0.90 | 100 |
| Air Conditioner | 2 | 1500 | 8 | 0.90 | 0.80 | 92 |
| Water Pump | 1 | 2200 | 3 | 0.85 | 0.70 | 88 |
Input Load per Item (W) = (Quantity × Rated Watts) ÷ (Efficiency ÷ 100)
Demand Load (W) = Input Load × Demand Factor
Adjusted Design Load (W) = (Total Demand Load ÷ Diversity Factor) × Safety Factor
Apparent Power (VA) = Adjusted Design Load ÷ Average Power Factor
Single Phase Current (A) = Apparent Power ÷ Voltage
Three Phase Current (A) = Apparent Power ÷ (1.732 × Voltage)
Daily Energy (kWh) = (Load in W × Hours) ÷ 1000
Monthly Energy (kWh) = Daily Energy × Run Days
Estimated Cost = Monthly Energy × Tariff Rate
Electrical load calculation helps size circuits correctly. It reduces overload risk. It improves safety. It also supports better breaker and cable selection. A proper estimate avoids waste and reduces future upgrades.
This form measures connected load, demand load, current, energy use, and estimated running cost. It also suggests a breaker size. The form includes power factor, efficiency, diversity, and safety factor inputs. These values improve real project planning.
Connected load is the total installed wattage. Demand load is lower in many projects. Not every device runs at the same time. Demand factor adjusts that reality. Diversity factor then refines the total estimate for the whole installation.
Power factor affects current draw. A lower power factor means higher current for the same active power. That can change cable size and breaker rating. Including this input makes the calculation more practical for motors, pumps, and cooling equipment.
Some loads consume more input power than their output rating suggests. Efficiency accounts for that difference. Motors and driven equipment often need this correction. By adding efficiency, the form estimates true input demand more accurately.
The calculator also estimates daily and monthly energy use. This helps compare equipment options. It helps control bills. It also supports budgeting during design stages. Even a simple monthly estimate can guide better purchasing decisions.
This tool is useful for fast planning. It is not a replacement for code compliance checks. Final designs should consider local standards, starting current, voltage drop, ambient temperature, installation method, and harmonics before approval.
Connected load is the sum of installed equipment power. It assumes all loads are available. It does not assume every item runs together.
Demand factor reduces installed load to a more realistic operating load. It reflects expected simultaneous use of each equipment group.
Lower power factor increases apparent power. Higher apparent power raises current. That affects breaker choice and conductor sizing.
Yes. Select three phase supply and enter the system voltage. The calculator then uses the three phase current formula.
No. It is a quick guide only. Final cable sizing must consider voltage drop, insulation type, grouping, ambient temperature, and code rules.
Efficiency converts output rating into estimated input power. This gives a better electrical load value for motors and other equipment.
Yes. Enter hours, run days, and tariff rate. The form estimates monthly energy use and approximate cost.
Yes. Always verify with local electrical codes and project standards before installation, procurement, or final design approval.
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.