How Interest is Calculated
Simple Interest Formula
SI = (P × R × T) / 100
Where:
- P = Principal amount
- R = Monthly interest rate (₹ per ₹100)
- T = Time in months and days
Compound Interest Formula
A = P × (1 + r/n)ntCI = A - P
Where:
- A = Final amount
- P = Principal
- r = Annual interest rate (decimal)
- n = Compounding frequency/year (12)
- t = Time in years
About this Interest Calculator
Interest Calculator India – Simple & Compound Interest with Dates
Use this free interest calculator to calculate interest on any amount using Simple Interest or Compound Interest methods. Just enter the principal, annual interest rate, and select the start and end dates – the calculator accurately computes interest based on full months and remaining days separately.
Switch between monthly compound interest and simple interest calculation modes to compare results. This tool is ideal for:
- Hand loan interest calculation
- Money lending and rural bookkeeping
- Informal loans and personal finance
- Daily, monthly, or yearly interest tracking
Results are shown in the Indian number system (e.g., ₹1,00,000) for easy readability.
Whether you're managing interest between friends, computing
village money lending interest, or verifying loan dues, this tool simplifies it all.
Best suited for India-based users needing precise, date-based interest computation.
Key Features
- Simple, user-friendly design –Best suited for Indian money lenders,borrowers, and personal finance users
- Supports date format (mm/dd/yyyy) – Ideal for rural interest calculation and desi bookkeeping
- Accurate calculation by full months and remaining days – Useful for hand loan interest and informal lending
- Perfect for rural and informal financial use – Tailored for small-scale money lending and Indian accounting
- Fast loading and fully mobile responsive – Optimized for smartphone users in India
- Clear breakdown of results – Displays principal, simple or compound interest, and total amount in Indian number format (e.g., ₹1,00,000)