Sajjad Ahmad
Pharmaceutical manufacturing professional · Founder, Pharmainform · Pakistan
About the author
PharmainformCalc is built and maintained by Sajjad Ahmad, a pharmaceutical manufacturing professional from Pakistan with 14 years of hands-on industry experience. His work spans solid, liquid and semi-solid dosage forms and pharmaceutical packaging, with deep practical expertise in tablet coating and compression.
Beyond day-to-day production, he works on the engineering and compliance side of a plant: equipment qualification, user requirement specification (URS) generation, factory and site acceptance testing (FAT and SAT), pharmaceutical plant layout design and area renovation projects.
He is the founder of Pharmainform, an education platform that explains pharmaceutical manufacturing through technical articles, infographics and video, followed by a professional community of more than 57,000 people on LinkedIn.
Professional experience
Solid dosage forms
Tablet manufacturing, with a specialist focus on coating and compression.
Liquid dosage forms
Experience in liquid dosage form manufacturing.
Semi-solid dosage forms
Experience in semi-solid dosage form manufacturing.
Pharmaceutical packaging
Experience in pharmaceutical packaging operations.
Technical expertise
Qualification
Equipment, utility and area qualification in line with GMP expectations.
URS generation
Writing clear user requirement specifications for new equipment and systems.
FAT and SAT
Planning and executing factory and site acceptance testing of equipment.
Plant layout design
Pharmaceutical facility layouts built around product, personnel and material flow.
Area renovation
Upgrading and modifying existing manufacturing areas while keeping GMP compliance.
Tablet coating and compression
Specialist hands-on focus within solid dosage manufacturing.
Our mission
Production and formulation teams run the same calculations repeatedly: batch size, tablet weight, API overage, coating material, powder flow and stage-wise reconciliation. Done by hand or in one-off spreadsheets, a small error in a unit or a formula can become a reconciliation investigation later. PharmainformCalc turns these formulas into clear, reusable tools, so the arithmetic is quick and the decision-making gets the attention.
Each calculator uses the standard formulas found in batch manufacturing documentation, and its page explains the formula, a worked example and the limits that usually apply.
What you will find here
Formulation planning
Batch Size, Tablet Weight, Coating Material, API Requirement, Mixer Capacity and Weight Variation.
Powder and liquid testing
Bulk and Tapped Density with Carr's Index and Hausner Ratio, and Deliverable Volume.
Process checks
Percentage Yield and a pharmaceutical Unit Converter for everyday shop-floor checks.
Batch reconciliation
Granulation, compression, coating, encapsulation, blister and packing reconciliation.
Alongside the tools, the site publishes practical guides on batch reconciliation, yield loss points, coating weight gain, API overage, powder flow and deliverable volume testing.
Important notice
PharmainformCalc is intended for reference and education. It supports calculations you already understand and does not replace your organization's validated SOPs, batch manufacturing records or professional judgment. Acceptance limits vary between products and sites, so always verify results against your own validated procedures before making a production decision. Nothing on this site is medical or regulatory advice. How the calculators work and how they were tested is explained on the methodology page.
Advertising and privacy
The site is independently owned and free to use. It may display advertisements served by Google AdSense to cover hosting and development costs. See the Privacy Policy for how cookies and data are handled, and the Terms of Use for the conditions of use.
Contact
Have a question, a correction or a calculator request? Email pharmainformcalc@gmail.com or visit the Contact page.