Solar CalculatorPlan a Project

Solar calculator

What Could Your Roof Do?

Drag the slider, pick your tariff and enter your monthly consumption. A first-stage estimate using Kalpa’s standard planning assumptions — then our engineers validate it against your site.

10,000 sq ft

1,000 – 1,00,000 sq ft

50,000 kWh

5,000 – 5,00,000 kWh / month, from your latest bill

Consumer Type
Estimated System Size100kWp
Monthly Demand Covered23%
Annual Generation
1,38,700 kWh
Annual Savings
₹13.9 L
CO₂ Avoided / Year
111 t
Savings Over 25 Years
₹3.47 Cr

Validate This With an Engineer

Indicative only, using Kalpa’s standard planning assumptions. Actual output depends on location, shading, structure and tariff.

Visible assumptions

Know What Sits Behind the Number.

Actual output varies with location, orientation, shading, structure and tariff. Where rooftop area is limited, open-access solar or storage may be the better answer.

  1. 01

    Capacity

    One kilowatt-peak of solar for every 100 sq ft of usable rooftop area.

  2. 02

    Generation

    Each installed kWp generates about 1,387 kWh a year under standard irradiation.

  3. 03

    Savings

    Annual generation × your reference tariff: ₹10/kWh industrial or ₹18/kWh commercial, over a 25-year plant life.

  4. 04

    Demand Covered

    Average monthly generation compared against the monthly consumption you enter from your bill.