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Generator Load Calculator

Not sure what size diesel generator you need? Tick your equipment, see your total load and the recommended KVA size — instantly. 130+ household, commercial and industrial items pre-loaded.

Lighting & Fans

0 items selected

LED bulb (9–12W)

10 W

CFL bulb

15 W

Tube light (4 ft)

40 W

LED tube light

20 W

Halogen lamp 200W

200 W

LED flood / high-bay light

150 W

LED street light

100 W

Ceiling fan

75 W

Pedestal / stand fan

90 W

Exhaust fan

60 W

Table fan

55 W

Home Appliances

0 items selected

LED TV (32–43")

80 W

LED TV (55–65")

150 W

Refrigerator (single door)

200 W Motor

Refrigerator (double door)

300 W Motor

Deep freezer

350 W Motor

Washing machine

500 W Motor

Dishwasher

1,500 W

Microwave oven

1,200 W

OTG / convection oven

1,500 W

Toaster / sandwich maker

800 W

Electric kettle

1,500 W

Mixer / grinder

750 W Motor

Iron

1,100 W

Vacuum cleaner

1,400 W

Geyser (15 L instant)

2,500 W

Geyser (25 L storage)

2,000 W

Immersion rod

1,500 W

Induction cooktop

2,000 W

Hair dryer

1,800 W

Air Conditioning & Cooling

0 items selected

Window AC – 1 ton

1,100 W Motor

Window AC – 1.5 ton

1,700 W Motor

Window AC – 2 ton

2,400 W Motor

Split AC – 1 ton

1,100 W Motor

Split AC – 1.5 ton

1,600 W Motor

Split AC – 2 ton

2,300 W Motor

Cassette AC – 3 ton

3,500 W Motor

Ducted / package AC – 5 ton

5,500 W Motor

VRF / chiller – 10 ton

12,000 W Motor

Air cooler (desert / room)

250 W Motor

Air purifier

50 W

Computers, Office & Electronics

0 items selected

Laptop

65 W

Desktop PC

350 W

Workstation / gaming PC

500 W

Monitor (24")

50 W

Monitor (32"+)

80 W

Laser printer

350 W

Large-format printer

800 W

Photocopier

1,500 W

Wi-Fi router / modem

15 W

Network switch

100 W

Server (1U / tower)

500 W

Full server rack (4–6 U)

3,000 W

UPS (online, 5 kVA)

5,000 W

CCTV camera (per unit)

10 W

CCTV DVR / NVR

50 W

Projector

350 W

Pumps & Motors

0 items selected

Pump – 0.5 HP (½ HP)

375 W Motor

Pump – 1 HP

750 W Motor

Pump – 1.5 HP

1,100 W Motor

Submersible pump – 2 HP

1,500 W Motor

Submersible pump – 3 HP

2,250 W Motor

Pump – 5 HP

3,700 W Motor

Pump – 7.5 HP

5,600 W Motor

Pump – 10 HP

7,500 W Motor

Industrial motor – 15 HP

11,200 W Motor

Industrial motor – 20 HP

14,900 W Motor

Industrial motor – 25 HP

18,650 W Motor

Industrial motor – 30 HP

22,400 W Motor

Industrial motor – 50 HP

37,300 W Motor

Industrial motor – 75 HP

56,000 W Motor

Industrial motor – 100 HP

74,600 W Motor

Commercial Kitchen & Retail

0 items selected

Commercial oven

3,500 W

Deep fryer

3,000 W

Pizza oven

4,000 W

Electric tandoor

4,500 W

Cold storage room (small)

2,500 W Motor

Display chiller

800 W Motor

Ice machine

1,500 W Motor

Commercial coffee machine

2,000 W

Dough / planetary mixer

1,500 W Motor

POS terminal

150 W

LED digital signage

400 W

Water dispenser (hot/cold)

500 W

Escalator

7,500 W Motor

Passenger elevator (small)

5,000 W Motor

Industrial Machinery

0 items selected

Air compressor – 5 HP

3,700 W Motor

Air compressor – 10 HP

7,500 W Motor

Air compressor – 20 HP

15,000 W Motor

Lathe machine (small, 3 HP)

2,250 W Motor

Lathe machine (10 HP)

7,500 W Motor

CNC machining centre

10,000 W Motor

Hydraulic press

5,000 W Motor

Injection moulding (50 ton)

15,000 W Motor

Batch mixer / blender

4,000 W Motor

Conveyor belt (per drive)

2,000 W Motor

Industrial blower (5 HP)

3,700 W Motor

Industrial chiller – 10 TR

12,000 W Motor

Welding, Tools & Construction

0 items selected

Arc welder (200 A)

5,000 W Motor

MIG welder

7,500 W Motor

TIG welder

3,000 W Motor

Spot welder

4,500 W Motor

Plasma cutter

5,000 W Motor

Drill machine

700 W Motor

Angle grinder

1,200 W Motor

Cut-off saw / large grinder

2,200 W Motor

Concrete mixer (1/2 bag)

1,500 W Motor

Concrete vibrator

1,500 W Motor

Plate compactor

3,000 W Motor

Tower light (site)

1,500 W

Hoist / crane (5 HP)

3,700 W Motor

Medical & Healthcare

0 items selected

X-ray machine

5,000 W

CT scanner

50,000 W

MRI machine

40,000 W

Ultrasound machine

1,500 W

Dialysis machine

2,000 W

Ventilator

300 W

Patient monitor

150 W

OT shadowless light

600 W

Autoclave sterilizer

3,000 W

Lab instrument (per unit)

500 W

Medical refrigerator

400 W Motor

Events, Audio & Stage

0 items selected

Powered speaker (small)

500 W

Line array / large speaker

2,000 W

Sub-woofer (1500W rated)

1,500 W

Audio mixer / DSP

300 W

PAR / LED stage light

200 W

Moving-head light

300 W

Spotlight (1500W follow)

1,500 W

LED video wall (per panel)

200 W

Smoke / fog machine

1,500 W

Haze / mist machine

600 W

Decor string lights (string)

50 W

How sizing works

How we calculate the right KVA for you

Step 1 · Sum the running watts

Every appliance has a wattage (sometimes written on a sticker as "rated power"). We add them up: ten 75-watt fans is 750 watts, plus a 1500-watt AC is 2,250 watts running.

Step 2 · Convert kW to KVA using power factor

Generators are rated in KVA (apparent power), but most appliances draw current with a power factor of around 0.8 because of inductive loads. So base KVA = kW ÷ 0.8. A 200 kW industrial load needs a 250 KVA base — before any margins.

Step 3 · Add motor-start headroom

Anything with an electric motor — ACs, refrigerators, pumps, compressors, mixers — draws extra current briefly at start. We add up to 25% on top of base KVA, scaled to your motor share: 0% extra for a pure resistive load (like heaters and IT loads), the full 25% extra for a fully motor-driven setup. The generator's inherent transient overload rating then handles the actual inrush.

Step 4 · Round up to a standard fleet size

Generators come in standard sizes: 20, 25, 30, 40, 50, 62.5, 82.5, 100, 125, 160, 200, 250, 320, 400, 500, 625, 750, 1000, 1250, 1500, 2000, 2500 KVA. We pick the next size up from your calculated need — for example, if your number comes to 175 KVA, you want a 200 KVA set. The natural gap between sizes (often 20–30%) automatically gives engine-life headroom and room for future load.

⚠️ The most common sizing mistake

People add up the rated wattages on stickers and pick a generator that exactly matches. Two things go wrong: motors trip the generator on start-up, and the engine runs at 100% all the time. Our calculator avoids both by adding motor inrush headroom and rounding up to the next standard fleet size. Result: a generator that actually runs reliably for years.

Load Calculator — FAQs

Quick answers to what customers ask us most.

How accurate is this calculator?

The calculator gives a strong starting estimate using typical Indian-market wattages, an 0.8 power factor and motor inrush headroom, then rounds up to the next standard fleet size. For final sizing — especially for industrial sites with large motors, welding machines or sensitive medical equipment — share your equipment list with us on WhatsApp and our engineers will do a precise sizing based on actual nameplate data and load profile.

What is the difference between KW and KVA?

KW (kilowatts) is the real power your equipment uses. KVA (kilo-volt-amperes) is the apparent power the generator must supply, because of the power factor (typically 0.8). Roughly: KVA = KW ÷ 0.8. Generators are always rated in KVA — that is what you should size for.

Why does the calculator add extra capacity?

Motors (in ACs, refrigerators, compressors, pumps) draw 2–3× their running current at start-up — this inrush would trip an undersized generator, so we add up to 25% on top of base KVA for motor-heavy loads. Then we round up to the next standard fleet size (e.g. 250 → 320 KVA) which naturally gives further headroom for engine life and future load additions.

Should I rent or buy after seeing the recommended size?

It depends on usage. If you need power for under 12 months total or have a single project, rental is almost always cheaper. For permanent standby of a hospital, factory or office, purchase + AMC works out better long-term. Talk to us — we offer both and can quote rent vs buy side-by-side.

Does the calculator account for harmonics or IT loads?

It uses a standard 0.8 PF which is fine for most mixed loads. For data centers, IT-heavy offices or installations behind a large UPS, the load profile is different and we recommend a low-harmonic-rated generator. Send us your single-line diagram and we will quote accordingly.

Want our engineers to size it precisely?

Share your equipment list — we'll do a free professional load study and quote rental or sales side-by-side.

💬 WhatsApp us 📞 +91 92127 57575