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Compound Interest Calculator

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Updated for October 2026: Top Online HYSAs 4.15%–4.25% APY • 1-Year CDs 4.25%–4.35% APY (Fed Funds Target 3.75%–4.00%) • 10-Yr Treasury Yield 5.10%

Compound Interest Calculator

Calculate compound growth on savings, certificates of deposit (CDs), and fixed deposits.

Exponential Yield
$
Quick:
$100,000
$5000 $2000000
%
Presets:
8 %
1 %25 %
Years
Tenure:
5 Yrs
1 Yrs40 Yrs
Direct Answer: $100,000 in 5 Years

An initial deposit of $100,000 growing at 8% compounded monthly reaches $148,985 after 5 years, generating $48,985 in pure compound interest.

Inflation Note: Assuming a standard 2.5% inflation rate, this future value retains approximately $131,681 in today's purchasing power.

Compounding Projections

Total Future Value (Principal + Interest)
$148,985
Initial Principal
$100,000
Compound Interest Earned
$48,985
Real Purchasing Power (2.5% Inflation)
$131,681
Growth Multiplier
1.49x
Loading interactive chart...
Private & Secure: 100% computed in browser. Zero data or files sent to servers.
Total Future Value$148,985Interest: $48,985

Direct Answer: Compound interest is interest earned on both initial principal and previously accumulated interest, accelerating portfolio growth exponentially over time.

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About Compound Interest Calculator

Often referred to as the eighth wonder of the world, compound interest enables modest initial savings to grow into massive nest eggs over time. ConvertSheet's Compound Interest Calculator lets you explore the impact of different compounding frequencies—from annual and quarterly to monthly and continuous daily compounding.

Formula & Computation Model
Exact Computation
A = P × (1 + r/n)^(n×t)
Variable Definitions:
P = Principalr = annual interest raten = compounding periods per yearand t = time in years.
Step-by-Step Guide

How to Convert Compound Interest Calculator to Result Online in 3 Simple Steps

Convert your data effortlessly with zero installations and complete local privacy.

  1. 1Step 1:

    Initial Principal

    Enter your starting balance or initial deposit amount.

  2. 2Step 2:

    Annual Interest Rate

    Specify the expected annual yield or savings interest rate.

  3. 3Step 3:

    Compounding Frequency

    Choose how frequently interest compounds (annually, semi-annually, quarterly, or monthly).

Help & Documentation

Frequently Asked Questions: Compound Interest Calculator

Answers to common questions regarding inputs, calculations, and mathematical methodology.

What is the Rule of 72?

Divide 72 by your annual interest rate to approximate how many years it will take to double your investment (e.g. at 8%, 72 / 8 = 9 years).

Why does more frequent compounding yield more money?

More frequent compounding credits interest earlier, meaning subsequent interest calculations operate on a larger base.

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