Daily Simple Interest Calculator

Q: How to find rate of interest?

You can find the annual rate of interest in your loan agreement, Fixed Deposit certificate, or credit card statement — typically expressed as % per annum (p.a.). If you know principal, total interest, and time: Rate = (Interest × 100) ÷ (Principal × Time).

Q: How to calculate compound daily interest?

Use A = P(1 + r/365)^(365×t), where A is total amount, P is principal, r is the annual rate as a decimal, and t is time in years. Our calculator does this instantly.

Q: How to compute interest compounded daily?

Divide your annual rate by 365 to get the daily rate, apply it to your balance each day, and add each day's interest back to the balance so the next day earns on a slightly larger amount.

Q: What does compounded daily mean?

Compounded daily means your bank or lender calculates interest at the end of every day and adds it to your balance, causing your money to grow faster than monthly or annual compounding.

Q: How to calculate daily interest on a loan?

Divide your APR by 365 to get the daily rate, then multiply by your outstanding balance. That is your daily interest cost.

Q: How to convert daily interest rate to annual?

For simple interest: multiply the daily rate by 365. For compounding daily: Effective Annual Rate = (1 + Daily Rate)^365 - 1. Example: 0.05% daily = 18.25% annually (simple).

📊 What Is a Daily Interest Calculator?

A daily interest calculator tells you exactly how much interest accrues on a sum of money for each day it sits in a loan, savings account, fixed deposit, or investment. Instead of waiting for your monthly bank statement, you get a clear, day-by-day picture of how interest builds — whether you're a borrower trying to understand costs or a saver watching your money grow.

Most financial institutions calculate interest on a daily basis, even if they only show you the figure monthly. That means the numbers are moving every single day. Our calculator brings those hidden daily movements to the surface.

⚖️ Simple vs. Compound Interest

Simple Interest

Simple interest is the most straightforward method. You earn (or owe) interest only on the original principal — the base amount never changes. It's commonly used for short-term personal loans, car loans, and RBI/government bonds.

💡 Formula: Interest = Principal × Rate × Time (in years)

Example: ₹1,00,000 at 8% annual rate for 90 days
Daily interest = ₹21.92 per day
Total interest for 90 days = ₹1,972.60

Compound Interest

Here, interest is added to the principal at regular intervals — daily, monthly, or annually — and then that larger amount starts earning interest too. Over time, this creates exponential growth (or exponential debt).

📈 Tip: Savings accounts and Fixed Deposits (FDs) use compound interest. Use our Daily Compound Interest Calculator to track those investments!

⭐ How to Use This Calculator

Using the daily interest calculator takes less than 30 seconds:

Enter your principal: This is your starting amount (e.g., ₹5,00,000). For a personal loan, it's what you borrowed. For an FD or Mutual Fund, it's what you deposited.
Enter the annual interest rate: Use the rate shown on your loan agreement or bank account (e.g., 7.5 for 7.5% p.a.).
Enter the number of days: How long is the tenure? You can also pick a start and end date and let the calculator count the exact days automatically.
Click Calculate: Instantly see your daily interest, total interest earned, principal amount, and a full maturity value breakdown.

👥 Who Uses a Daily Interest Calculator?

Borrowers (Personal Loans): Knowing your exact daily interest cost helps you plan EMIs, make smart prepayments, and avoid penalties. Even a single extra payment can cut days or weeks of interest.
Savers & Investors: Comparing accounts? Use this calculator to see which one actually puts more money in your pocket over specific operational days.
Businesses: Short-term business loans, overdraft facilities, and supplier lines of credit often charge daily interest. Finance managers use daily calculations to manage cash flow.
Legal & Accounting: Calculating interest on overdue client payments, court judgments, or delayed tax/GST liabilities often requires precise daily interest tracking.

💡 Tips to Reduce Interest Costs

Make early or extra payments: Every rupee you pay back early cuts the base on which interest is calculated.
Negotiate your rate: Even a 0.5% reduction can save thousands of rupees over a single year.
Watch the number of days: Confirm if your lender uses 360 or 365 days, as it affects the effective daily rate.

❓ Frequently Asked Questions

How to find rate of interest?

You can find the annual rate of interest mentioned in your loan agreement, Fixed Deposit (FD) certificate, or credit card statement. It is typically expressed as a percentage per annum (p.a.). If you know your principal, total interest paid, and time period, you can find the simple interest rate mathematically using: Rate = (Interest × 100) ÷ (Principal × Time).

How to calculate compound daily interest?

To calculate daily compound interest manually, use the formula A = P(1 + r/365)^(365×t), where A is the total maturity amount, P is the principal, r is the annual rate (in decimal), and t is time in years. Because doing this by hand for hundreds of days is complex, our daily interest calculator instantly processes this math for you.

How to compute interest compounded daily?

Computing interest compounded daily means taking your annual rate, dividing it by 365 to get the "daily rate", and applying that tiny percentage to your balance every single day. Crucially, each day's interest is added back to your balance, meaning the next day you earn interest on an ever-slightly larger amount.

What does compounded daily mean?

Compounded daily means that your financial institution calculates your interest at the end of every day and immediately adds it to your principal balance. It ensures your money grows (or your debt increases) far faster than if interest was only calculated monthly or annually.

How to calculate daily interest on a loan?

For a simple daily interest loan, divide your Annual Percentage Rate (APR) by 365 to get your daily interest rate. Multiply that daily rate by your outstanding loan balance. The result is exactly how much that loan costs you in interest for that single day.

How to convert daily interest rate to annual?

To convert a simple daily interest rate to an annual rate, multiply the daily percentage by 365. For example, if your daily rate is 0.05%, your annual rate is 0.05% × 365 = 18.25% p.a. If the interest is compounding daily, use the effective annual yield formula: Effective Annual Rate = (1 + Daily Rate)^365 − 1.

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