Business Calculators Hub
The calculators and guides behind smarter money decisions — for founders, freelancers, and finance teams.
Money decisions, calculated
Every business decision is a math problem in disguise. Should you take the loan or bootstrap? Is that "low" monthly payment actually cheap? How much will your money be worth in ten years if you invest it instead of spending it? Guessing at these questions is expensive — the difference between a good and a bad financing decision can be tens of thousands of dollars over the life of a loan or investment.
This hub collects the Calculate All calculators that matter most for business and personal finance, alongside plain-English guides that explain the concepts behind the numbers. Every tool runs entirely in your browser — your figures never leave your device — and every page shows the formula it uses, so you can audit the math yourself.
Start with the big three
If you only learn three financial concepts this year, make them these: compound interest (how money grows — and how debt grows faster), the true cost of borrowing (monthly payment × number of payments, plus fees), and return on investment (did this actually make money?). The calculators below cover all three, plus the supporting cast: mortgages, salary conversions, savings goals, inflation, and tax estimates.
Business & finance calculators
Compound Interest Calculator
Watch compounding turn time into money.
Debt Payoff Calculator
Your escape date from any balance, at any payment.
EMI Calculator
Know your exact monthly loan payment before you borrow.
Income Tax Estimator
A simplified peek at your tax bill — not tax advice.
Inflation Calculator
What today's money will be worth tomorrow.
Mortgage Calculator
Plan your home purchase: payment, down payment, interest.
Personal Loan Calculator
Personal loan monthly payments, decoded.
Retirement Savings Calculator
Find your number: what to save monthly to retire well.
ROI Calculator
Measure what your money actually earned.
Salary Converter
Hourly, monthly, annual — translate any paycheck.
Savings Goal Calculator
Turn any goal into a monthly savings number.
SIP Calculator
See how small monthly investments compound into wealth.
Guides worth reading first
Understand the concept before you trust the answer. These explainers walk through the formulas with real numbers:
How Compound Interest Works: Formula, Rule of 72 & Examples
Compound interest explained with real numbers: the formula, the rule of 72, why starting early beats investing more.
SIP vs Lump Sum Investing: Which Builds More Wealth?
SIP or lump sum? We compare both strategies with real numbers — when steady investing wins and when it doesn't.
EMI Explained: Home Loan EMI Guide, Formula & Examples
Understand how home loan EMIs work: the formula decoded, amortization, and five ways to pay less interest.
Loan Tenure vs EMI: The Costly Trade-Off Explained
Longer tenure, smaller EMI — but far more interest. See the trade-off with real numbers before you sign.
APR vs Interest Rate: What's the Difference?
APR includes fees; the interest rate doesn't. Learn what APR really tells you before comparing loans.
Retirement Savings Math: How Much Do You Really Need?
Do the retirement math yourself: the 25x rule, the 4% rule, and how monthly savings compound over decades.
A note on estimates
These tools illustrate concepts and produce estimates — they are not financial advice. Tax rules, fees, and personal circumstances vary; verify important decisions with a qualified professional. See our Disclaimer.