Source: https://adamou-financial-consulting.vercel.app/tools/simple-interest/

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# Simple interest calculator

 

Explore interest calculated on an unchanged starting amount.

  [ 
    
   Use the calculator
](https://adamou-financial-consulting.vercel.app/#tool-simple) [ 
    
   Before you begin
](https://adamou-financial-consulting.vercel.app/#prepare) [ 
    
   See an example
](https://adamou-financial-consulting.vercel.app/#worked-example)  

Private calculations in your browser. No account required.

 

Your calculator

Simple interest

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EXPLORE YOUR NUMBERS

## Simple interest

Explore interest calculated on an unchanged starting amount.

Starting amount 

(USD)

Annual simple interest rate 

(%)

Duration in months 

(months)

CalculateReset example

Example values are shown. Change them to explore your situation.

How this estimate works

Interest = principal × annual rate / 100 × months / 12. Total = principal + interest.

Simple interest only: interest does not earn additional interest. Assumes the principal and annual rate stay unchanged, with no deposits, repayments, fees, or taxes. This is not an amortized-loan calculation or a quoted account return.

 

BEFORE YOU BEGIN

 

## Bring the right numbers.

 

Estimates are enough to explore. Keep every money amount in the same
        selected currency.

   
- 01

 

A starting principal that stays unchanged.

- 02

 

A hypothetical annual simple-interest rate.

- 03

 

The length of the scenario in complete months.

 

MAKE THE RESULT USEFUL

 

## What to look for.

 

Use this tool only for a simple-interest scenario. Compare the interest amount with the original principal. For interest that compounds or a balance with monthly repayments, choose the matching growth or loan tool instead.

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Discuss your next step with Matt
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Your calculator inputs are not included in your inquiry.

   

WORKED EXAMPLE · USD

 

###  Simple interest over your period: $300.00 

   Starting amount  $5,000.00   Annual simple interest rate  4 %   Duration in months  18 months    

$5,300.00 principal plus interest after 18 months. No compounding or repayments.

 

The example matches the starting inputs. It is an illustration, not a
        recommendation.

 

TRY ANOTHER SCENARIO

 

## 
Change one thing.
  Notice the difference.

   

Compare a 12-month and a 24-month duration at the same principal and rate. In this model, doubling time doubles interest because interest does not compound.

 [
Return to your numbers
](https://adamou-financial-consulting.vercel.app/#tool-simple) 

Changing inputs here does not send them to Matt or save them between
        visits.

 

A FEW THINGS YOU MAY BE WONDERING

 

## 
Good questions.
  Clear answers.

     How is this different from compound growth? 

  

Simple interest is calculated only on the unchanged starting principal. Compound growth adds interest to the balance so later growth also applies to earlier interest.

   Can I use this for a loan I repay monthly? 

  

Not to estimate its repayment schedule. This model never reduces principal. The loan payment calculator models a fixed-rate loan with regular monthly repayments.

 

KEEP EXPLORING

 

## Build a fuller picture.

 

Three related tools for your next question.

  [
View all tools
](https://adamou-financial-consulting.vercel.app/tools/)   [ 

 

### Compound growth

 

Explore how regular contributions could grow over time.

 ](https://adamou-financial-consulting.vercel.app/tools/compound-growth/)[ 

 

### Loan payment

 

Estimate the monthly principal and interest for a fixed-rate loan.

 ](https://adamou-financial-consulting.vercel.app/tools/loan-payment/)[ 

 

### Savings goal

 

Estimate how many monthly contributions reach your goal.

 ](https://adamou-financial-consulting.vercel.app/tools/savings-goal/)