Blog archive
Guides that go with our free calculators and generators: the numbers, formulas and sources behind each tool.
What a Pakistani sales tax invoice must show under section 23 of the Sales Tax Act, what changed in 2025 and 2026, the extra FBR e-invoice fields, provincial rules for services, and a filled example invoice.
The HEC formula for converting CGPA to percentage in Pakistan, band by band, with full tables for the 4.0 and 5.0 scales, HEC's own grade table, worked examples, the reverse formula and how it differs from simply dividing by 4.
How many units a 1kW, 3kW, 5kW or 10kW solar system produces per day and per month in 16 Pakistani cities, from Global Solar Atlas data, plus the units from one panel and how to size a system for your bill.
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Jamshaid Ali
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