What is a loan calculator?

A loan calculator helps you estimate monthly installments, total interest, and total repayment based on loan amount, interest rate, and loan term.

What is the difference between flat interest and effective (annuity) interest?

Flat interest calculates interest based on the original loan amount, while effective or annuity interest reduces interest as your loan balance decreases over time.

Does this loan calculator send my data to any server?

No. All loan calculations are performed locally in your browser. Your data is never uploaded or stored anywhere.

Which loan type is commonly used for mortgages?

Most banks use the effective interest or annuity method for mortgages (KPR/KPA), as the interest decreases as the loan balance is paid down.

Is flat interest more expensive than annuity interest?

Yes. Flat-rate loans often result in higher total interest compared to annuity loans, because interest is always calculated from the original loan amount.

Why is annuity interest higher at the beginning of the loan?

In an annuity system, monthly installments remain fixed, but the composition changes: more interest is paid in the early months and more principal is paid later in the term.

Can this calculator handle different currencies?

Yes. You can switch between currencies such as IDR, USD, EUR, and JPY. All results automatically adjust to the selected currency format.

Can I use this calculator for business loans or personal loans?

Yes. This calculator works for personal loans, business loans, consumer loans, and mortgage simulations as long as the interest method is flat or annuity.

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Loan Calculator – Flat & Effective Interest

Calculate loan installments, total interest, and repayment using flat or effective (annuity) interest methods. Fast, accurate, and privacy-friendly.

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Loan Calculator – Flat & Effective Interest