TopToolsAiCompare simple interest against compound interest on a principal amount over time, and see exactly how much extra compounding earns you. PKR 100,000 invested for 10 years at 8% grows to PKR 200,000 under simple interest but to roughly PKR 215,900 under annual compounding — the gap widens every year as interest starts earning interest on itself.
Last updated: 1 Sep 2026
How to use Simple & Compound Interest Calculator
- Enter the principal amount, annual interest rate, and number of years.
- Click "Calculate" to compare simple interest vs. compound interest side by side.
Frequently asked questions
Why does compounding matter so much over time?
Because each year's interest is added to the principal and starts earning interest itself, the gap between simple and compound interest grows faster the longer the money is invested.
Does this assume interest compounds annually?
Yes, this version compounds once per year. More frequent compounding (monthly/daily) would produce a slightly higher result.
What is a realistic interest rate to use?
This depends heavily on the investment type — savings accounts, fixed deposits, and stock market averages all differ significantly, so use a rate that matches your actual instrument.
Does adding regular contributions change the calculation?
This calculator projects a single lump sum growing over time. For regular monthly contributions on top, the Retirement Savings calculator is a better fit.
User Reviews
No reviews yet — be the first to try this tool and leave one.
More Free Tools
Handy the next time you're here
Crypto Investment Return Calculator
Tax & Financial
Estimate potential returns on a cryptocurrency investment over time.
Stock Profit & Loss Calculator
Tax & Financial
Calculate profit or loss on a stock trade including buy/sell price and quantity.
Break-Even Point Calculator
Tax & Financial
Find out how many units you need to sell to break even.
Currency Exchange Fee Calculator
Tax & Financial
See the real cost of currency conversion fees on any transfer.
Mortgage Calculator
Tax & Financial
Estimate monthly mortgage payments for any home loan amount.
Retirement Savings Calculator
Tax & Financial
Project retirement savings growth over time, for any currency.
Australia GST Calculator
Australia Tools
Add or remove Australia's 10% GST on any amount.
Umrah Cost Calculator
Travel & Immigration
Estimate total Umrah trip cost including flights, stay and visa.
Leave a review