Finance calculators that explain the math.
From your next mortgage to a 30-year retirement projection, every tool here gives you the answer plus the formula behind it. No fluff, no upsells — just the numbers you need to make a confident decision.
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Start with our most-used finance tools
Mortgage Calculator
Estimate monthly payments, interest, and amortization.
Open calculatorFinanceCompound Interest
See how investments grow over time.
Open calculatorFinanceProfit Margin Calculator
Gross, operating, and net margin in one view.
Open calculatorFinanceInvestment Calculator
Project portfolio growth with contributions.
Open calculatorBy intent
What are you trying to do?
Tools grouped by the question you're actually asking — not by alphabetical accident.
Borrow & buy
Mortgages, loans, and large purchases — know the true cost before you sign.
Mortgage Calculator
Estimate monthly payments, interest, and amortization.
Finance →House Affordability
How much home you can responsibly afford.
Finance →Loan Calculator
Calculate payments and total interest on any loan.
Finance →Auto Loan Calculator
Plan a car purchase with full cost breakdown.
Finance →Payment Calculator
Solve for payment, term, or rate on any loan.
Finance →Amortization Calculator
Full month-by-month payment schedule.
Finance →Debt-to-Income Ratio
Lender-grade DTI snapshot in seconds.
Finance →Invest & grow
Project growth, compare returns, and plan long-horizon wealth.
Investment Calculator
Project portfolio growth with contributions.
Finance →Compound Interest
See how investments grow over time.
Finance →Interest Calculator
Simple interest on loans, deposits, and bonds.
Finance →ROI Calculator
Return on investment with annualized rate.
Finance →Inflation Calculator
See how prices change over decades.
Finance →Earn, save & plan
Take-home pay, taxes, savings goals, and a confident retirement.
Salary Calculator
Convert between hourly, weekly, and annual pay.
Finance →Tax Calculator
Estimate income tax owed for the year.
Finance →Savings Calculator
Reach a goal with regular deposits.
Finance →Retirement Calculator
Plan a confident path to retirement.
Finance →Budget Calculator
Allocate income with the 50/30/20 method.
Finance →Currency Converter
Convert between 150+ currencies at live rates.
Finance →Run a business
Pricing, margin, commissions, and the numbers every owner watches.
Learn
Money guides worth reading
Plain-English explainers that pair with the calculators above.
How a mortgage actually works
Principal, interest, escrow, and how amortization shifts over time.
Open Mortgage CalculatorCompound interest, in plain English
Why time in the market beats timing the market — with the math to prove it.
Open Compound InterestHow much house can you really afford?
The 28/36 rule, DTI, and the hidden costs lenders don't always mention.
Open House AffordabilityMargin vs markup — they're not the same
A 50% markup is a 33% margin. Here's why that gap matters for pricing.
Open Profit Margin CalculatorFormulas you can verify
Every calculator shows the math behind the result, with sources where the data isn't universal.
Built for real decisions
No paywalls, no ad-stuffed results — just the numbers you'd want before signing or saving.
Private by default
Inputs stay on your device. We don't store, sell, or upload what you type into the calculators.
Calcxo's finance calculators are general-purpose tools for planning and education. They aren't financial, tax, or legal advice — for high-stakes decisions, talk to a licensed professional who knows your situation.