Methodology

The formulas we use

Every calculation uses the standard, bank-grade formulas — the same ones lenders and exam boards use:

• Loan / EMI: P × r × (1+r)ⁿ ÷ ((1+r)ⁿ − 1), where P is the principal, r the monthly rate (annual ÷ 12 ÷ 100), and n the number of months.
• SIP future value: M × ((1+r)ⁿ − 1) ÷ r × (1+r).
• Fixed deposit: P × (1 + r/4)^(4n) for quarterly compounding.
• Murabaha: (financed + financed × margin%) ÷ months.
• Zakat: 2.5% × (zakatable assets − immediate debts), if above the nisab.

How rates are sourced

Default rates come from each country's central-bank publications and typical commercial-bank offerings, reviewed periodically (last refreshed for 2026). We cover 34 economies and link 171 named banks. Central-bank rates change frequently — every page shows the figures as reference estimates and advises you to verify with your bank. You can always override any rate manually.

See the live reference: central-bank & loan rates across 34 countries.

How the math is verified

The calculator math is independently verified against 63 published bank examples and cross-checked to within rounding. Only the suggested default rates may drift over time; the formulas themselves are exact. A "Check calculator math" panel on the homepage shows worked examples you can reproduce in any reputable calculator.

Limitations & disclaimer

fin·calc provides estimates for educational purposes — not personalised financial advice. Tax (capital gains, interest-income tax, allowances), subsidy eligibility, and individual credit factors are not applied and vary by person. For decisions, consult a qualified, licensed advisor and confirm current rates with your bank.