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.
• Money transfer true cost: total paid − (amount received ÷ mid-market rate); with the provider's rate, fee = total paid − (amount received ÷ provider rate) and markup = 1 − provider rate ÷ mid-market rate. Provider quotes are entered by you — we never store or invent provider prices. Money transfer cost calculator.

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 33 economies and link 45 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 33 countries.

Money transfer & currency data

The money transfer calculator uses four dated data sources and never invents a provider price. Currencies: ISO 4217 list one (with amendments through January 2026). Reference rates: a daily snapshot from ExchangeRate-API's free tier (European Central Bank fallback), shown with its date; a snapshot older than two days is labelled indicative, and a currency without a rate is shown as "rate unavailable". History: European Central Bank reference rates where the ECB publishes the currency, otherwise the site's own daily archive (from August 2026). Providers: which routes each provider serves and its payout and payment methods, each row cited to the provider's own website with the date checked. We don't store fees, exchange rates or delivery times; you paste the quote a provider gives you and we measure it against the reference rate. Benchmarks: UN SDG 10.c (below 3%) and the World Bank's Remittance Prices Worldwide (6.36% global average, Q3 2025).

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.