S M Ariful Islam Shawon
Last updated: September 18, 2026
Founder & author, Math of Money
S M Ariful Islam Shawon founded Math of Money and builds and maintains its calculators and the explanations that accompany them.
Every calculator is built from primary sources — IRS publications, Social Security Administration rules, CFPB and HUD guidance — and its math is tested against hand-verified reference values before it is published. The formulas, assumptions, and sources behind each result are shown on the calculator page itself.
Profiles
Calculators by S M Ariful Islam Shawon
- Mortgage Calculator
- Amortization Calculator
- House Affordability Calculator
- Refinance Calculator
- FHA Loan Calculator
- Rent vs. Buy Calculator
- Mortgage Payoff Calculator
- VA Loan Calculator
- Home Equity & HELOC Calculator
- Down Payment Calculator
- 401(k) Calculator
- Retirement Calculator
- Roth IRA Calculator
- Social Security Benefits Calculator
- Required Minimum Distribution (RMD) Calculator
- Loan Calculator
- Auto Loan Calculator
- Student Loan Calculator
- Credit Card & Debt Payoff Calculator
- Debt-to-Income Ratio Calculator
- Personal Loan Calculator
- Compound Interest Calculator
- Investment Calculator
- Savings Goal Calculator
- CD Calculator
- Inflation Calculator
- Net Worth Calculator
- Currency Converter
- Paycheck Calculator
- Federal Income Tax Calculator
- Salary to Hourly Calculator
- Budget Calculator
Found an error?
Email contact@mathofmoney.com with the calculator, your inputs (or the page link), and what you expected. See the editorial policy for how corrections are handled.