David
David is the pen name of Zeeshan Abbas.
Founder and lead calculator developer, CalcWise.finance · MBA in Finance · MSc
A finance professional with 20+ years of experience in finance, operations and data management, building free, accurate financial calculators and guides for people in India.
About the author
The Finance Mind Behind CalcWise.finance
David is the founder and lead calculator developer of CalcWise.finance, a free library of financial calculators and guides built for Indian taxpayers, borrowers, savers and small business owners.
The idea is simple: take the formulas behind income tax, EMIs, SIPs, provident fund, GST and government savings schemes, and turn them into free tools that anyone can use without signing up or handing over personal data.
Every calculator and guide credited to David on this site is built and reviewed by him.
Transparency
Who Writes Under the Name David
“David” is the pen name of Zeeshan Abbas, founder of CalcWise.finance. We state this openly so readers always know who stands behind the numbers. You can confirm his background on his LinkedIn profile.
Experience
20+ Years Across Finance, Operations and Data
Lab and CS Manager
Day-to-day work managing laboratory operations, computer systems and the data behind them.
Founder and Lead Calculator Developer
CalcWise.finance
Designs, builds and reviews every calculator on the site, from the formulas and inputs to the explanations and reference tables.
Finance, Operations and Data Management
20+ years
More than two decades of hands-on work in finance, operations and data management. That experience is the foundation for the methods used across this site.
Education
Academic Foundation in Finance
MBA in Finance
University of Engineering and Technology (UET), Lahore
Master of Science (MSc)
University of Karachi
Areas covered
Finance Topics Covered on CalcWise.finance
Featured tools
Popular Calculators Built by David
Editorial standards
How Every Calculator Is Built
Each calculator starts from the official rules it models, such as Income Tax Department slabs and rebates, government notifications for small savings schemes, and standard loan amortisation formulas. The tools run entirely in your browser, so the numbers you enter are not stored. Where precise decimal maths matters, calculators use the Big.js library to avoid rounding errors. Pages are reviewed and updated when tax rules or scheme rates change, and every page shows when it was last updated.
Found an error or want a new calculator? Contact us and David will review it.