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Electrical & Energy Tools

Electrical calculations for load, wire size and units. 28 tools. All free, no signup.

UPS Backup Time Calculator

Find how long your load will run on battery, in hours and minutes.

Battery Sizing Calculator

Find how many Ah of battery your load needs.

Appliance Running Cost

Find the monthly electricity cost of AC, fridge and fan.

AC Tonnage Calculator

Find the right AC tonnage for your room size.

CCTV Storage Calculator

Find how much hard disk space your cameras need and how many days of recording you get.

Generator Fuel Calculator

Find how much diesel or petrol your generator uses and what it costs.

Ohms Law Calculator

Voltage, current, resistance, power — enter any 2 and get the other 2.

Voltage Drop & Wire Size

Calculate cable size and voltage drop in mm2.

AWG Wire Size Converter

Convert AWG to mm and mm2 for electricians. Find wire gauge size.

Power Factor Calculator

Calculate power factor and correction capacitor size. Understand your load.

Circuit Breaker Size Calculator

Choose the right MCB size for circuits

Resistor Color Code Decoder

Select the color bands on a resistor to decode its resistance value and tolerance instantly

Inverter AC Savings Calculator

Compare monthly electricity cost of inverter versus non inverter AC by tonnage and daily usage hours, and see how fast the extra price pays for itself

Protected Electricity Consumer Checker

Check if you qualify as a protected electricity consumer and see how much the subsidy saves you.

TOU Peak Hours Checker

Check if the current time is a peak electricity hour and plan heavy appliance use for off-peak.

Tube Well Electricity Cost Estimator

Estimate monthly electricity cost of running your agricultural tube well under current tariffs.

UPS Battery Runtime Calculator

Find out how long your UPS will run your load from battery capacity and power draw.

Home Appliance Electricity Cost Calculator

Estimate monthly electricity cost of home appliances in Pakistan by wattage and daily usage hours.

AC Electricity Cost Calculator

Estimate your air conditioner electricity cost per hour, day, month and year from tonnage, usage hours and tariff.

LED Resistor Calculator

Calculate the right series resistor for any LED from supply voltage, LED voltage and current, with nearest E12 value and safe power rating.

Ohms Law Wheel

Interactive Ohms law wheel: enter any two of voltage, current, resistance and power to instantly solve the other two with all 12 formulas.

Battery Life Calculator

Estimate device runtime from battery capacity and current draw, with usable capacity and Peukert adjustment options.

Air Cooler Electricity Cost Calculator

Find out what your air cooler costs per day, month and summer season from wattage, hours and tariff.

Electric Geyser Running Cost Calculator

Work out daily and monthly running cost of your electric geyser plus cost per bath and saving tips.

Distribution Transformer Load Calculator

Check transformer loading in percent from kVA rating, connected load and power factor, with remaining capacity.

Room Heater Electricity Cost Calculator

Calculate monthly electricity cost of running a room heater in Pakistan from wattage and daily usage, with slab wise marginal cost and money saving tips.

Instant vs Storage Geyser Cost Comparer

Compare instant and storage water geysers on running cost, installation cost and payback period, and find the cheaper option for your family.

Inverter AC vs Normal AC Cost Comparison

Compare electricity cost and payback period of inverter AC vs normal AC in Pakistan before you buy.

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