Electrical Load Calculator

Build an appliance schedule; estimate demand, kW, kVA, phase current, tariff and load headroom.

This tool runs entirely in your browser. Your data is never uploaded, never stored, and never leaves your device.

Builds an editable appliance schedule and keeps connected load, diversified demand, kVA, running current, motor starting current and energy use separate, then applies editable connection screens and a real slab-tariff bill model.

How to use it

1Choose an India, Europe or US single- or three-phase example, then add, remove or edit appliances with nameplate watts, quantity, use hours and diversity.
2Enter power factor, safety headroom, motor starting multiplier and any proposed EV load, then compare connected load with diversified running and starting demand.
3Replace the example phase/current screening rules and standard breaker list with the limits that actually apply to the property.
4Model the bill with arbitrary telescopic slabs, fixed charge, duty basis and other charges, then copy or print the load-extension worksheet and its assumptions.

Example

Input: The built-in household list on a 230 V single-phase supply
Output: 7.88 kW connected and 18.58 kWh/day; at 0.60 diversity and 0.90 power factor, 4.728 kW / 5.253 kVA maximum demand and 22.84 A running current

With 25% headroom the illustration is 28.55 A and the next listed breaker is 32 A. Its 1 kW largest motor at 3× startup gives 6.728 kW equivalent and 32.50 A. Over 30 days, the default editable slabs and charges total ₹4,852.16 for 557.4 units; those rates and the 5 kW/40 A phase screens are examples, not official rules.

What happens to your data

All appliance, tariff and connection data stays in this browser tab. The calculator separates real power from apparent power and uses the root-three factor for three-phase current, but its breaker, headroom, phase and bill results are planning illustrations. A qualified electrician and the local utility must verify supply approval, diversity, cable derating, protection, earthing, fault level, motor starting and current tariffs before work or purchase.

Last updated September 2026

Build an editable electrical load worksheet for a home, shop, office, workshop, or EV-charging plan. It separates connected nameplate load from estimated coincident demand, then shows kW, kVA, current, energy, and an itemised electricity-bill estimate.

The built-in appliances, supply settings, diversity, tariff slabs, and thresholds are examples—not local rules. Replace them with nameplate data, the applicable DISCOM tariff, and advice from a licensed electrician.

How it works

Connected load is the sum of input watts × quantity. Estimated demand applies your diversity factor to the ordinary load and a separate simultaneity factor to proposed EV chargers. Apparent power is kW ÷ power factor; current uses P ÷ (V × power factor) for single phase and P ÷ (√3 × V × power factor) for three phase.

The phase screen compares demand current with editable single-phase thresholds and headroom. Its next-standard-breaker figure is an illustration for planning discussions, not permission to select protection or cable size. The motor-start scenario applies your starting multiplier to the largest motor input and is not a protection trip-curve study.

For bills, enter cumulative energy slabs, billing days, fixed charge, duty, and other charges. Subsidies, rebates, minimum charges, time-of-day rates, fuel adjustments, taxes, and arrears are not inferred. Copy or print the worksheet for verification with the DISCOM or electrician.

Common use cases

Inventory present and proposed appliance loads
Estimate EV charging demand and daily energy
Compare single-phase and three-phase planning scenarios
Model cumulative slab tariffs and fixed charges
Prepare a clear worksheet for an electrician or DISCOM application

Frequently asked questions

What is the difference between connected load and estimated demand?＋

Connected load assumes every listed appliance is on at full nameplate input. Estimated demand applies your diversity and EV simultaneity assumptions to represent likely overlap; those factors must be chosen for the real installation.

Why are kW, kVA, and current different?＋

kW is real power, while kVA also reflects the entered power factor. Current then depends on kVA, voltage, and whether the supply is single phase or three phase.

Does the phase result prove that my installation should be three phase?＋

No. It is a screen against thresholds you can edit. The DISCOM, sanctioned load, local rules, voltage drop, motor starting, and installation design determine the actual connection.

Can this tool select a breaker, cable, or earthing system?＋

No. The breaker row is only an illustrative standard rating above the calculated planning current. A licensed electrician must size conductors and protection and verify fault level, derating, voltage drop, earthing, and local code.

How accurate is the electricity-bill estimate?＋

It follows the slabs and charges you enter. It does not automatically add local subsidies, rebates, taxes, fuel adjustments, minimum billing, time-of-day rates, or arrears, so compare it with the current tariff order.

Should I enter appliance input watts or output ratings?＋

Use electrical input from the nameplate or manufacturer data. Horsepower, cooling tons, and other output ratings are not direct electrical input values.

Is the electrical worksheet uploaded anywhere?＋

No. Calculations, copying, and printing are handled locally in your browser.