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Compound Interest Calculator

Calculate compound interest on FDs, PPF, savings accounts and other Indian investments. See how your money grows exponentially with quarterly, monthly, or yearly compounding. Compare different investment options and plan your financial goals with accurate projections.

Updated: April 2026·By Rajat

Enter investment details

₹
1.0%15.0%
1 Years30 Years

Your investment growth

Maturity Amount (Total Value)

₹2.00 L

₹2,00,160

Principal Invested

₹1.00 L

Your initial investment

Interest Earned

₹1.00 L

100.2% return over 10 years

Effective Annual Rate

7.19%

What you actually earn per year

Year-by-Year Growth

Loading chart…

Compound Interest Formula

A = P × (1 + r/n)^(n×t)
A = Final amount (Maturity value)
P = Principal (Initial investment)
r = Annual interest rate (as decimal)
n = Compounding frequency per year
t = Time in years

Key Concepts Explained

Principal (P)

The initial amount of money you invest or deposit. In India, minimum FD deposits start from ₹1,000, while PPF allows minimum ₹500 per year.

Rate of Interest (r)

The annual interest rate offered by the investment. Current FD rates range from 6-8%, PPF offers 7.1%, while senior citizen FDs offer 0.5% extra.

Time Period (t)

The duration for which your money remains invested. PPF has a 15-year lock-in, FDs can range from 7 days to 10 years. Longer periods mean more compounding benefits.

Compounding Frequency (n)

How often interest is calculated and added to your principal. Indian FDs typically compound quarterly (n=4), while PPF compounds annually (n=1).

Compare Indian Investment Options

InvestmentCurrent RateCompoundingTax TreatmentBest For
Fixed Deposit (FD)6.5% - 7.5%QuarterlyTaxable (TDS applies)Conservative investors, senior citizens
Public Provident Fund (PPF)7.1%AnnualCompletely tax-free (EEE)Long-term tax-saving goals
Savings Account2.5% - 4%MonthlyTaxableEmergency funds, daily expenses
Senior Citizen Savings Scheme8.2%QuarterlyTaxable (TDS may apply)Retirees seeking guaranteed returns
NSC (National Savings Certificate)7.7%AnnualTaxable (but qualifies for 80C)Tax-saving investments for parents

Step-by-Step Guide

1

Enter your principal amount — the initial sum you want to invest. For FDs, minimum is typically ₹1,000; for PPF, minimum annual contribution is ₹500.

2

Enter the expected annual interest rate. Current FD rates are around 6.5-7.5%, PPF is 7.1%, senior citizen FDs offer 8%. Higher rates mean higher returns.

3

Select compounding frequency. Quarterly is standard for FDs, annual for PPF, monthly for savings accounts. More frequent compounding yields better returns.

4

Enter investment tenure. Longer periods maximize compound growth — 10 years at 7% more than doubles your money. PPF has a minimum 15-year tenure.

5

Review the year-by-year breakdown to see exactly how your money grows and when you'll reach your financial goals.

Pro Tip: The Rule of 72

To quickly estimate how long your money takes to double, divide 72 by your interest rate. At 8% annual compound interest: 72 ÷ 8 = 9 years to double your money. This is useful for quick mental calculations but is only an approximation.

Frequently Asked Questions

SIP Calculator FD Calculator PPF Calculator Lumpsum Calculator

Compound Interest Calculator: Goal-based investing, risk balance, and post-tax outcomes

Author: Rajat | Updated: April 2026 | 8 min read

Strong investing outcomes come from contribution discipline and allocation quality, not return chasing.

Table of Contents

  1. Section 1: Foundation
  2. Section 2: Deep Dive
  3. Section 3: Application

Introduction

Investment planning improves when you connect goal timeline, contribution rhythm, and post-tax return quality. This structure helps translate product choices into a realistic wealth path.

Section 1: Foundation

Define objective first: safety, growth, or income. Then choose instruments and contribution approach that align with liquidity needs and risk tolerance.

Subsection: Contribution behavior as alpha

In long horizons, regular investing and timely step-up often matter more than perfect entry timing. Consistency compounds better than sporadic optimization.

Expert Quote: "Process beats prediction in long-duration wealth creation." — Evidence-backed personal investing practice

Section 2: Deep Dive

Compare stability-heavy and growth-heavy allocations under conservative, base, and optimistic assumptions to understand drawdown comfort and target reliability.

ComparisonOption AOption B
ApproachStability-first mixGrowth-first mix
Factor 1Lower volatility, slower compoundingHigher upside, larger interim swings
Factor 2Better short-term liquidity comfortRequires stronger behavioral discipline

Section 3: Application

Implement with periodic contribution review, step-up planning, and annual rebalancing so your portfolio stays aligned with goals and risk profile.

Step 1: Set target corpus and timeline

Translate goals into monthly/annual contribution requirements using realistic return ranges.

Step 2: Design allocation and review rhythm

Choose instrument mix and set quarterly review checkpoints for contribution and risk drift.

Conclusion

Investment success is a systems outcome. If your process is disciplined and review-driven, returns become a byproduct of consistency.

References

  1. SEBI investor education and mutual-fund risk frameworks
  2. Long-horizon compounding and allocation research
  3. Tax-treatment rules for key savings and investment instruments

How to Use Compound Interest Calculator: A Step-by-Step Guide

Difficulty: Beginner to Intermediate | Time Required: 25-40 minutes | What You'll Need: Goal amount and target timeline, Current monthly/annual investable surplus, Tax-slab and liquidity requirements

Overview

This guide helps you design a practical investment workflow from baseline projection to execution discipline.

Before You Start

  • [ ] Separate emergency corpus from long-term investing pool
  • [ ] Define goal priority and expected timeline
  • [ ] Set conservative and base return assumptions

Step 1: Build baseline projection

Estimate corpus trajectory using current contribution and realistic return assumptions.

Step 1 Screenshot / Image Placeholder

Tip: Use step-up contribution assumptions linked to salary growth.

Step 2: Layer risk and tax filters

Check post-tax outcomes, lock-in constraints, and liquidity needs before final allocation.

⚠️ Warning: Do not compare instruments only on headline return without tax and liquidity context.

Step 3: Automate and review

Set contribution automation and re-evaluate assumptions quarterly or after major life events.

Troubleshooting

ProblemSolution
Target corpus looks unattainableIncrease contribution rate gradually, extend timeline, or adjust return-risk expectations.
Plan breaks during volatile marketsUse rule-based contribution and rebalance framework to reduce emotional decisions.

Next Steps

Now that you've completed this workflow, you can:

  • Create annual step-up plan and checkpoint dates
  • Add withdrawal-phase modeling for long-term goals

FAQ

Q: Should I prioritize SIP or lumpsum?

A: It depends on cash availability and behavior. A disciplined SIP workflow works well for most users.

Q: How frequently should I rebalance?

A: Annual rebalance is common, with interim review after large allocation drifts.