Interest Calculator
Compare simple interest using either the traditional ₹ Vaddi method or a percentage-based rate. Results update instantly and work for months or years.
Inputs
₹0
1
1 month
Enter a whole number and choose the unit below.
₹0
10%
1 month
Years are converted to months automatically.
Result
₹0
Enter values to calculate interest.
SIMPLE
INTEREST
INTEREST
Principal amount₹0
Total interest₹0
Monthly interest₹0
Total amount₹0
Use valid numbers to see calculations and step-by-step explanation.
Converters
Monthly % = 1.00, Yearly % = 12.00
Monthly % = 10.00
How this interest calculator works
This calculator supports two intuitive approaches for simple interest in India: a ₹ Vaddi method and a percentage-based method. It is designed for quick planning, learning, and comparison without any signup.
₹ Vaddi formula
Interest = (Principal × Vaddi × Months) ÷ 100
Percentage interest formula
Simple Interest = (Principal × Rate × Time) ÷ 100