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Simple Interest Calculator

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Introduction

Our Simple Interest Calculator helps you determine the interest accumulated using the Simple Interest Method. It is a method of calculating the accumulated interest for the principal lent. It is calculated on the principal only without including the effect of compounding.

How to use this calculator?

Using the Simple Interest calculator, you can find the simple interest, interest rate, principal, or period by inputting all the other variables required for the calculation.

The variables in the Simple Interest calculator are:

Principal (P)
The amount borrowed.

Rate of Interest (R)
The interest rate agreed upon while borrowing the Principal.

Time Period (T)
The Principal borrowed for a specific period.

Simple Interest (SI)
The Simple Interest accumulated for the respective principal (P) at the interest rate (R) and Time period (T).

Total Interest (TI)
The total simple interest accumulated over the period of the debt.

What is Simple Interest?

Simple Interest, as the name suggests, is a simple method of calculating interest for some principal amount at an agreed-upon interest rate and period without the effect of compounding.

You can think of the interest rate as the cost of borrowing the principal amount. If the lender lends you the principal, they will charge you an interest rate. It could be either simple interest or compound interest, which you have to pay periodically to keep the amount that you have borrowed.

This type of interest usually applies to automobile loans or short-term loans, and sometimes mortgages use this simple interest rate.

Most banks currently use compound interest for their loans, by which the banks make more money from their customers.

How is Simple Interest Calculated?

We calculate the Simple interest for a year with the following formula:

SI=P×R×T100\text{SI} = \normalsize \dfrac {P \times R \times T}{100}

Where,

P → Principal Amount.
It is the amount that is initially borrowed from the lender.

R → Rate of Interest in % Per Annum
This is the rate of interest at which the principal amount is being lent to the borrower.

T → Time Period in Years
This is the duration for which the principal amount is given to the borrower.

While calculating simple interest, the principle remains the same. Unlike compound interest where we add the interest of the previous years to the principal to calculate the interest for the next year.

To calculate the total amount, you have to use the following formula.

Amount (A)=Principal (P) + Interest (I)=P + (PRT)=P(1+RT)\begin{aligned}\text{Amount (A)} &= \text{Principal (P) + Interest (I)} \\[10pt]&= \text{P + (PRT)} \\[10pt]&= \text{P(1+RT)}\end{aligned}

Simple Interest for Months

Let us look at the formula for calculating simple interest for months.

SI=P×R×m12×100\large \text{SI} = \normalsize \dfrac {P \times R \times m}{12 \times 100}

Where,

P → Principal Amount

R → Rate of Interest in % Per Annum

m → Time Period in Months

Simple Interest for Days

Let us look at the formula for calculating simple interest for days.

SI=P×R×d365×100\large \text{SI} = \normalsize \dfrac {P \times R \times d}{365 \times 100}

Where,

P → Principal Amount

R → Rate of Interest in % Per Annum

d → Time Period in Days (Non-leap year)

Example

Person A lends $10,000 to Person B for 1 year at a Simple Interest Rate of 6%.

The interest for 1 year will be

SI =P×R×T100=$10,000×6×1100=$600\begin{aligned}\large \text{SI } &= \normalsize \dfrac {P \times R \times T}{100} \\[10pt]&= \dfrac {\$10,000 \times 6 \times 1}{100} \\[10pt]&= \$600\end{aligned}
Author

hexacalculator design team

Our team blends expertise in mathematics, finance, engineering, physics, and statistics to create advanced, user-friendly calculators. We ensure accuracy, robustness, and simplicity, catering to professionals, students, and enthusiasts. Our diverse skills make complex calculations accessible and reliable for all users.

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