Calculators & Tools
Free, instant calculators to size wiring, MCBs, geysers, fans and lighting correctly — no sign-up needed.
Wiring & Safety 4
Wire Size Calculator
Free wire size calculator for Indian homes. Enter the load in watts or amps and get the recommended copper cable size in sq mm.
ViewCable Size for AC Calculator
Find the right copper cable size and MCB rating for your air conditioner by tonnage — 1 ton, 1.5 ton or 2 ton splits.
ViewMCB Rating Selector
Choose the correct MCB rating (amps) for lights, sockets, AC, geyser and kitchen circuits in an Indian home.
ViewHome Electrical Load Calculator
Estimate your home's total electrical load in kW and the sanctioned load / main MCB you need. Free calculator.
ViewLighting 3
LED Wattage to Lumens Converter
Convert LED watts to lumens and find the old incandescent bulb equivalent. Buy the right brightness, not just wattage.
ViewRoom Lighting Calculator
Calculate how many LED bulbs or panels you need for a room based on its size and use. Free lighting calculator.
ViewLED Savings Calculator
Calculate your yearly electricity savings by switching old bulbs to LED. Free India LED savings calculator.
ViewFans 1
Pipes & Plumbing 1
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How our calculators help you buy right
Sizing electrical and plumbing products by guesswork is how homes end up with overheating wires, tripping breakers or a shower that dies when someone opens the kitchen tap. These free calculators use the same conservative rules of thumb a good electrician or plumber follows — Indian standards, 230 V single phase, IS 694 cable sizing, BEE ratings and CPVC pressure classes — so you buy the right size the first time.
They are instant and need no sign-up. Use a calculator to get the number, read the matching buying guide for the reasoning, then order the exact size from the Wall2Roof store.
Which calculator do you need?
| You want to… | Use this |
|---|---|
| Size house wiring for a load | Wire Size Calculator |
| Wire an air conditioner safely | Cable Size for AC |
| Pick the right MCB and curve | MCB Rating Selector |
| Choose a geyser capacity | Geyser Capacity Calculator |
| Pick a ceiling fan size | Ceiling Fan Size |
| Convert LED watts to brightness | LED Wattage to Lumens |
| Light a whole room | Room Lighting Calculator |
| Size CPVC water pipes | CPVC Pipe Size Selector |
| Check your home electrical load | Home Load Calculator |
| See LED switching savings | LED Savings Calculator |
Frequently asked questions
Are these calculators accurate?
They use conservative, India-specific rules of thumb (230 V, copper conductor, IS 694 sizing, MCB curves, BEE ratings, CPVC classes). They are a reliable starting point — for final wiring and plumbing always confirm with a licensed electrician or plumber.
Do I need to sign up or pay?
No. Every calculator is completely free and instant, with no sign-up, login or app.
Are they built for Indian standards?
Yes — 230 V single phase, sq mm copper cabling, B/C-curve MCBs, CPVC pipe sizing and litre-based geyser sizing, exactly as used in Indian homes.