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Finance calculators simplify the bookkeeping of growth and repayment—they don’t know your lender’s fees or tax situation. Treat outputs as structured sketches you can explain to a teacher, advisor, or future you.
Compound interest predates double-entry accounting; APR disclosure rules arrived after consumers misread nominal vs effective rates. Amortization schedules standardize payment splits into principal vs interest over time.
FV = PV(1+r)^n for compounding; annuity PV/PMT formulas for equal payments—inputs must share compounding period with r.
Rate and period must match: monthly rate with months, annual with years. Mixing cadence is the dominant spreadsheet bug; this tool expects consistent conventions per mode.
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These are independent references—government labs, international measurement bodies, or university course materials—that explain the definitions behind the numbers. We don’t endorse third-party sites; we point to them for deeper reading.
Short version: PMT = P * [r(1+r)^n] / [(1+r)^n – 1]
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Annual Percentage Rate: the total cost of borrowing expressed as a yearly percentage including fees.
Compound interest is interest on interest, leading to much faster growth over long periods.
Unless a mode explicitly models fees, treat the calculator as tuition for structure—pull legal disclosures for offers.
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