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Finance Calculators
Loan/amortization, ROI, markup vs margin, sales tax, break-even — quick numbers without spreadsheets.
Calculator
Loan / Amortization
ROI / Profit
Markup vs Margin
Sales Tax
Break-even
Principal
APR (%)
Years
Extra Payment /mo (optional)
Outputs first 12-month summary + payoff time with extra payments.
Calculate
Copy Output
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Output
These calculators are informational only and do not constitute financial advice.