---
title: "Free Simple Interest Calculator - AgentDock"
description: "Calculate simple interest on loans, savings, or investments with a full breakdown of principal, rate, and time"
url: "https://agentdock.ai/prompt-library/lifestyle/finance/simple-interest-calculator"
docs_index: /llms.txt
---

# Simple Interest Calculator

Calculate simple interest on loans, savings, or investments with a full breakdown of principal, rate, and time

Category: Finance

## Prompt template

```
I need to calculate simple interest for a financial decision I am working through.

The principal amount is [PRINCIPAL] and the annual interest rate is [RATE:number:0-100] percent.

The time period for this calculation is [TIME_PERIOD], and I would like the time broken down in [TIME_UNIT:select:days,weeks,months,years].

The purpose of this calculation is [PURPOSE:select:personal loan,auto loan,student loan,savings account,certificate of deposit,short-term investment,lending money to someone,other].

I want to see the results as [OUTPUT_FORMAT:select:a quick summary,a detailed breakdown with yearly progression,a comparison of simple vs compound interest,all of the above].

Any additional context about my situation: [CONTEXT?]

Using the simple interest formula I = P x r x t, calculate the total interest earned or owed on my principal over the full time period. Show the final amount including principal plus interest. If I selected a detailed breakdown, provide a year-by-year or period-by-period table showing how interest accumulates. If I selected a comparison, show how the result would differ under compound interest so I can see the real-world impact. Include the monthly equivalent payment if this is a loan, explain whether simple interest works in my favor for this type of transaction, and offer one or two practical tips based on my specific purpose.
```

## Variables

- Principal (text, required)
- Rate (number, required)
- Time Period (text, required)
- Time Unit (select, required) — options: days, weeks, months, years
- Purpose (select, required) — options: personal loan, auto loan, student loan, savings account, certificate of deposit, short-term investment, lending money to someone, other
- Output Format (select, required) — options: a quick summary, a detailed breakdown with yearly progression, a comparison of simple vs compound interest, all of the above
- Context (text, optional)

Tags: finance, interest, calculator, loans, savings

Open in the editor: https://agentdock.ai/prompt-library/lifestyle/finance/simple-interest-calculator