Financial Calculators
Made Simple
Whether you're a freelancer estimating quarterly taxes, a first-time buyer running mortgage numbers, or someone tracking calories with precision — Arogun gives you the exact figure you need. Free, no signup, no guesswork. Every calculator is built on the same formulas used by accountants and nutritionists.
Not sure where to start?
New Planning Tools
Compare housing, savings, and inflation decisions directly
Mortgage choice
Refinance Break-Even Calculator
Test whether lower payments actually recover closing costs in time.
Housing decision
Rent vs Buy Calculator
Compare rent cost, ownership friction, and projected equity over your stay.
Savings planning
Savings Goal Calculator
Turn a vague target into a monthly plan and estimated completion timeline.
Purchasing power
Inflation Calculator
Translate today's prices into future cost and pressure-test your targets.
How It Works
Every calculator on Arogun follows the same three-step process:
Enter your numbers
Each tool asks only for the information it actually needs. No unnecessary fields, no confusing jargon.
e.g. monthly income, expenses, savings rate
Get your result instantly
Calculations happen in real time in your browser. There is no data sent to a server and nothing is stored.
e.g. €1,200/month mortgage payment
Understand the context
Every calculator page includes a full explanation of the formula used, what the result means, and how to act on it. A number without context is just a number.
e.g. "Break-even: 340 units/month — here's why"
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.
Most online calculators use rough approximations. Arogun uses the same standards as CPAs and registered financial planners.
No account required.
You shouldn't have to hand over your email just to run a number. No signup, ever — not even for the advanced tools.
Covers both money and health.
Financial stress and physical health are connected. Arogun covers both in one place, because you shouldn't need five different sites.
Built by someone who uses these tools.
Built by a software engineer, entrepreneur and lifelong athlete who actually uses every method on this site — not an agency hired to fill a template.
Frequently Asked Questions
How accurate are these calculators?
Every calculator on Arogun is built on verified formulas sourced from the IRS, CFPB, peer-reviewed studies, and established financial standards — the same references used by professionals.
Do I need an account to use Arogun?
No. Every tool is free and works instantly in your browser without registration, payment, or email entry.
What is the difference between TDEE and BMR?
BMR is the number of calories your body burns at rest. TDEE adds your activity level on top of that — it's the number you actually need to hit your fitness goal.
How often should I recalculate my mortgage payment?
Recalculate whenever your income changes, interest rates shift, or you're considering a larger down payment. Even small changes in rate or term make a large difference over 30 years.
About Arogun
Arogun was built by Osman Rahimi, a software engineer, entrepreneur 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.
Request a Tool