Hafiz Muhammad Usman

I am a software developer and the person who builds and maintains Calvo. I started the project because students from 9th class to university kept needing the same handful of tools, a calculator, formulas, unit conversions, CGPA and merit calculations, and none of them lived in one place that worked well on a phone.

What I have built

• The Calvo calculator engine, with basic and scientific modes.
• A searchable library of more than 9500 formulas across 19 subjects, organised by class and subject.
• Derivative, integral, limit, algebra, matrix, statistics and ODE tools that show their working.
• GPA, CGPA, target CGPA and attendance calculators, and merit aggregate calculators for MDCAT, ECAT, NUST and FAST-NU.
• Photo, PDF and document tools that process files inside the browser instead of uploading them.
• An AI math solver that connects to a student's own Gemini API key.
• An installable, offline-capable web app with an interface in 25 languages.

What I am responsible for on this site

I am responsible for the calculators, the formula data and the guides on this site, and I decide what is published. When a university changes an admission formula or a reader reports a mistake, I am the person who updates the page.

How I handle accuracy and corrections

• Admission formulas are taken from published criteria and are labelled as estimates, with a reminder to confirm the official notice for the current year.
• The calculus tools check their answers numerically, and the guides use worked examples that match what the calculators return.
• If you find an error, email me with the page address and what is wrong. Corrections are made on the page itself.

Get in touch

The fastest way to reach me is by email at usmaniftikhar2803@gmail.com, or use the contact form. Bug reports, wrong formulas and feature suggestions are especially welcome. I usually reply within a few days.

More about the project: About Calvo · Privacy Policy · Terms