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Finance Calculators

Daily Interest Calculator

Verified formula Updated Jun 2026 Private — runs on your device

Enter details
%
Verified formula Private

Interest for the period

₹821.92

Interest per day
₹27.40

For general information only — not financial, tax, legal or medical advice. Verify before you rely on it.

How to use the Daily Interest Calculator

The Daily Interest Calculator works out your interest for the period, along with 1 related figure in an instant. Enter principal amount, annual interest rate and number of days and the result updates as you type — it is free, needs no sign-up, and runs entirely in your browser so your figures stay private.

  1. Enter the principal amount.
  2. Enter the annual interest rate.
  3. Enter the number of days.
  4. Read off your interest for the period, together with interest per day — the calculator updates automatically, with no button to press.

Formula

The Daily Interest Calculator uses the formula:

Interest for the period = Principal amount × Annual interest rate ÷ 100 ÷ 365 × Number of days

Worked example

For example, with principal amount of 100,000, annual interest rate of 1% and number of days of 30, the interest for the period is ₹821.92.

Inputs used
Principal amount 100,000
Annual interest rate 1%
Number of days 30
Results
Interest for the period ₹821.92
Interest per day ₹27.40

Results are estimates for educational use, not professional advice.

Key terms explained

Interest rate
The percentage charged on a loan or paid on savings, usually quoted per year (per annum).
Principal
The original sum of money borrowed or invested, before any interest is added.

Frequently asked questions

Multiply the principal by the annual rate, divide by 365 for the daily rate, then multiply by the number of days.

The daily interest is about 27.40, so 30 days comes to roughly 821.92 in simple interest.

This uses simple interest, with no compounding within the period. Compounding would add interest on interest.

Most loans and savings use a 365-day year for daily interest, though some use 360. Adjust the rate if your terms differ.

Enter the principal amount. Enter the annual interest rate. Enter the number of days. Read off your interest for the period, together with interest per day — the calculator updates automatically, with no button to press.

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