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Interest Calculator
Calculate Simple or Compound Interest. Toggle between modes and adjust compounding frequency.
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What is Interest
What is Interest
Interest is the amount earned on an investment or paid on a loan over time. It is usually expressed as a percentage.
Simple Interest Formula
Simple Interest Formula
Simple Interest (SI) = (P × R × T) ÷ 100
P = Principal | R = Rate (per year) | T = Time (years)
Example:
P = ₹10,000 | R = 10% | T = 2 years
SI = ₹2,000 → Total Amount = ₹12,000
P = ₹10,000 | R = 10% | T = 2 years
SI = ₹2,000 → Total Amount = ₹12,000
Compound Interest Formula
Compound Interest Formula
CI = P × (1 + R/100)^T − P
Principal (P)₹10,000
Rate (R)10%
Time (T)2 years
CI≈ ₹2,100
Total Amount≈ ₹12,100
Difference Between Simple & Compound Interest
Difference Between Simple & Compound Interest
Simple InterestCalculated only on principal
Compound InterestCalculated on principal + accumulated interest
Why Interest Calculator is Useful
Helps plan investments
Know exactly what your money will grow to
Useful for loans and savings
Works for both borrowing and investing scenarios
Helps compare options
Compare simple vs compound interest easily
Benefits of Compound Interest
Higher returns over time
Earn more as interest compounds on itself
Power of compounding
Your interest earns interest every period
Ideal for long-term investments
The longer you invest, the greater the gains
Frequently Asked Questions
Interest calculated only on the principal amount.
Interest calculated on principal plus accumulated interest.
Compound interest is better for long-term investments.
Yes, it can be used for both loans and investments.