Financial Calculators
Made Simple
Making smart financial and health decisions starts with having the right numbers. Arogun provides free, precision-built calculators for personal finance, investment planning, tax estimation, and fitness — each built on verified formulas and real-world research. No subscriptions, no signups, no guesswork. Just accurate tools that give you a clear answer in seconds.
Featured Tools
PopularCompound Interest Calculator
Calculate how your investment grows over time with compound interest. Perfect for retirement planning and long-term savings goals.
Freelance Tax Estimator
Estimate your quarterly tax obligations as a freelancer or independent contractor. Stay compliant and avoid penalties.
Mortgage Payment Calculator
Calculate your monthly mortgage payments and see how much you'll pay in interest over the life of your loan.
Emergency Fund Calculator
Calculate how much you need in your emergency fund based on monthly expenses and income stability.
All Tools
Compound Interest Calculator
Understand how your savings or investments grow over time using the power of compounding. Whether you're planning for retirement or building an emergency fund, knowing your projected growth helps you make decisions with confidence rather than guesswork.
Freelance Tax Estimator
Self-employed individuals in the United States are responsible for a 15.3% self-employment tax on top of regular income tax. This estimator breaks down your quarterly obligations so you never face a surprise bill from the IRS.
Mortgage Payment Calculator
Calculate your exact monthly payment using the standard amortization formula, and see how the 28/36 rule applies to your income. Understanding your numbers before speaking to a lender puts you in a significantly stronger position.
ROI Calculator
Return on investment is the most fundamental metric in business and investing. Use this tool to evaluate any financial decision from a business venture to a marketing campaign.
Emergency Fund Calculator
The Consumer Financial Protection Bureau recommends 3–6 months of essential expenses as a baseline. This calculator tells you your exact target based on your personal situation — not a generic estimate.
Break-Even Analysis Calculator
Before launching a product or business, knowing your break-even point is essential. This calculator is built on the same formula recommended by the U.S. Small Business Administration for standard business planning.
TDEE Calculator
Your Total Daily Energy Expenditure is the single most important number in nutrition and body composition. Calculated using the clinically validated Mifflin-St Jeor formula, this tool gives you a precise calorie target based on your body and activity level.
Why Use Arogun?
Every calculator on this site is built on a foundation of verified financial and scientific formulas — the same ones used by accountants, financial planners, and nutritionists. Here's what makes Arogun different from generic calculator sites:
Built on real research.
Each tool references peer-reviewed studies, IRS guidelines, and established financial standards — not approximations or oversimplifications.
No account required.
Every calculator is completely free and works instantly in your browser without registration or payment.
Covers both money and health.
Most calculator sites focus on one area. Arogun covers personal finance, investment, tax, real estate, business planning, and fitness in one place — because financial and physical health are both essential to living well.
Built by someone who uses these tools.
Arogun was created by a software engineer with 20+ years of experience in competitive sports, body transformation, e-commerce, and personal finance — someone who has personally tested the methods behind every calculator on this site.
About Arogun
Arogun was built by a software engineer and lifelong athlete who wanted a single place for accurate, no-nonsense financial and fitness calculators. Every tool on this site is based on verified formulas and real-world research — not estimates or generic advice. Read more on the About page.
Need a Custom Calculator?
We're constantly adding new tools. Can't find what you need? Let us know and we'll build it for you.