Is this calculation free and private?

Yes, 100% of calculations execute locally in your web browser. No inputs or personal data are stored or transmitted.

What do I need to enter?

Just Principal Amount, Annual Interest Rate and Loan Term. Every field has a sensible default you can start from.

Is my data uploaded anywhere?

No. The calculation runs in your browser with JavaScript — nothing you type is sent to a server or stored.

Does it work on a phone?

Yes. The layout adapts to small screens and needs no app or signup.

Simple Interest Calculator Pro

Calculate simple interest (SI), total repayment amount, and daily interest accrual without compounding.

100% free
Private in browser
No signup
No watermarks

Principal Amount ($)

Annual Interest Rate (%)

Loan Term (Years)

Total Simple Interest ($)

2,700

Total Repayment Amount ($)

14,700

Daily Accrued Interest ($)

2.466

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About Simple Interest Calculator Pro

Calculate simple interest (SI), total repayment amount, and daily interest accrual without compounding. Enter Principal Amount, Annual Interest Rate and Loan Term and the tool works out Total Simple Interest, Total Repayment Amount and Daily Accrued Interest straight away. Everything runs in your browser, so your data never leaves your device.

How to use Simple Interest Calculator Pro

Enter Principal Amount, Annual Interest Rate and Loan Term.
Change any value to see the result update instantly.
Read Total Simple Interest, Total Repayment Amount and Daily Accrued Interest in the results panel — copy or download what you need.

Key features

Shows Total Simple Interest ($)
Shows Total Repayment Amount ($)
Shows Daily Accrued Interest ($)
3 adjustable inputs, results update as you type
No signup, no limits

Frequently asked questions

Is this calculation free and private?: Yes, 100% of calculations execute locally in your web browser. No inputs or personal data are stored or transmitted.
What does the Simple Interest Calculator Pro give me?: It works out Total Simple Interest, Total Repayment Amount and Daily Accrued Interest, updating live as you change the inputs.
What do I need to enter?: Just Principal Amount, Annual Interest Rate and Loan Term. Every field has a sensible default you can start from.
Is my data uploaded anywhere?: No. The calculation runs in your browser with JavaScript — nothing you type is sent to a server or stored.
Does it work on a phone?: Yes. The layout adapts to small screens and needs no app or signup.

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