Solar calculators
Four calculators that take you from your electricity bill to a sized, priced solar system and its payback. They use the current tariff, November 2026 market prices and measured sun data for your city.
Four steps, each one a tool
Use them in order, or jump to the one you need. Each tool passes its result to the next.
Pick a calculator
Electricity bill calculator
Enter your units and see the bill line by line, including the surcharges and taxes. Or enter a bill amount and get the units back.
Open the bill calculator →Solar load calculator
List your appliances, how many and for how long. Get daily units, peak load, and the system size, panels, inverter and battery that fit.
Open the load calculator →Solar cost calculator
Choose the size, panel brand, inverter class, batteries and structure. Get an itemised cost at current market rates.
Open the cost calculator →Solar ROI calculator
Enter your bill and the system cost. See the monthly saving, the payback period and the 25-year return under the 2026 net billing rules.
Open the ROI calculator →Where the numbers come from
Sun. Yield for each city comes from the Global Solar Atlas published by the World Bank Group. For Karachi that is 1,697 kWh per kW of panels per year. We then take off 10% of that for dust and real-world losses, which gives about 4.2 units per kW per day.
Tariff. Bills use the residential schedule in S.R.O. 279(I)/2026, effective February 2026, which is the same for K-Electric and every other distribution company, with the fuel and quarterly adjustments on current bills.
Net billing. From 9 February 2026 new solar connections fall under NEPRA's Prosumer Regulations. Units you export earn about Rs 11 each, while units you buy cost the full tariff. The ROI calculator models both sides separately.
Prices. Panel, inverter and battery prices are market rates surveyed from dealer listings in November 2026. Tier-1 panels are running at Rs 40 to 45 per watt. Every cost is shown with a range of plus or minus 10%.
These are estimates to help you plan. They are not a quotation from Mastoor Energy; a site visit can change the structure, cabling and electrical works.
Guides and services
Solar system price in Pakistan (November 2026)
Solar system prices in Pakistan for November 2026: 3 kW to 20 kW, on-grid and hybrid, with units produced, an itemised 10 kW breakdown and what drives the cost.
Open →On-grid vs hybrid vs off-grid solar: which system do you need?
How on-grid, hybrid and off-grid solar systems differ, which one keeps the power on during load-shedding, and how to choose for a home or business in Karachi.
Open →Solar installation in Karachi
Turnkey solar installation in Karachi: on-grid, hybrid and off-grid systems for homes, offices, factories and government sites. AEDB No-Limit enlisted.
Open →Want an exact quote?
The calculators give a market estimate. Send us your result and a few photos of your roof and we will give you a firm price.