Simple Interest Calculator
Calculate simple interest and the total amount from principal, rate and time.
Compound Interest Calculator
Enter the principal, rate and years and pick how often interest compounds.
Your files stay with you. Your files never leave your browser. This tool runs on your device: nothing is uploaded to our servers, so there is nothing for us to store or see.
How to use it
- Enter the principal, rate and time in years.
- Pick the compounding frequency.
- Read the maturity amount and the year-by-year table.
Questions people ask
What is the compound interest formula?
Amount = P x (1 + r/n) ^ (n x t), where r is the yearly rate as a decimal, n is how many times a year interest is added and t is the years. Rs 1,00,000 at 8% for 10 years compounded yearly becomes about Rs 2,15,892.
Does more frequent compounding help a lot?
A little. At 8% a year, monthly compounding gives an effective 8.30% against 8% for yearly. The rate and the time matter far more.
What is the effective yearly rate?
It is the single yearly rate that gives the same result as your frequency of compounding, so it lets you compare different schemes fairly.
Want this inside your own account?
Marketiism keeps your invoice numbers, GST reports, UPI payment links and WhatsApp reminders in one place. Leave your details and we'll call to set it up for your business, or start the trial yourself.
More Converters and calculators
FD Calculator
Work out the maturity amount of a fixed deposit with quarterly, monthly or yearly compounding.
Lump Sum Return Calculator
Estimate the value of a one-time investment, or find the CAGR of an investment you already hold.
SIP Calculator
See what a monthly mutual fund SIP could grow to, with an optional yearly step-up.
Unit Converter
Convert length, weight, area, volume, speed, data, time, pressure, energy and temperature.
Age Calculator
Find your exact age in years, months and days, and when your next birthday comes.