how to calculate bank interest
How to Calculate Bank Interest Step-by-Step
Whether saving or borrowing, interest calculation determines your real gain or cost.
Bangladesh-focused guide with practical calculation workflow.
Step-by-Step Explanation
- Identify principal, rate, and time
- Choose simple or compound method
- Compute total interest and final amount
Formula Used
- Simple interest = P × r × t
- Compound amount = P × (1 + r/n)^(n×t)
Example Calculation
- Simple: BDT 200,000 at 10% for 2 years gives BDT 40,000 interest.
Common Mistakes
- Mixing annual and monthly rates
- Using wrong time unit
FAQ
- When to use simple interest? For short flat contracts.
- When to use compound? For savings and many long-term products.
Related Calculators
- Open: /calculators/interest-calculator
- Open: /calculators/simple-interest-calculator
- Open: /calculators/compound-interest-calculator