---
title: "Simple Interest Calculator"
description: "Calculate simple interest on loans, savings, or investments with a full breakdown of principal, rate, and time"
slug: "lifestyle/finance/simple-interest-calculator"
tags: ["finance", "interest", "calculator", "loans", "savings"]
author: "AgentDock Team"
agentdockUrl: "https://agentdock.ai/prompt-library/lifestyle/finance/simple-interest-calculator"
chatgptDemoUrl: "https://chatgpt.com/share/69b406ca-7108-800a-bf48-64441c045965"
claudeDemoUrl: "https://claude.ai/share/b35c0787-0a63-46fa-aa71-2383f19bcf4a"
perplexityDemoUrl: "https://www.perplexity.ai/search/title-simple-interest-calculat-yB8Pql8ZS9KyecaLbeTLOA"
qwenDemoUrl: "https://chat.qwen.ai/s/t_c05e1210-99d8-43b3-9f08-326122473455?fev=0.2.12"
---

# Simple Interest Calculator

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.
