RD Calculator
Estimate the maturity value of a recurring deposit at the post office or a bank, from your monthly deposit and the interest rate.
Researched by Mirza Seraj BaigFacts last checked against official sources on 7 September 2026Post office RD starts at ₹100 a month, in multiples of ₹10.
Post office RD rates are notified quarterly by the Ministry of Finance. Bank RD rates vary by bank and tenure.
The post office RD account runs for 5 years and can be extended.
Maturity amount
₹3,56,829
≈ 3.57 lakh
- Total deposited
- ₹3,00,000
- Interest earned
- ₹56,829
- Number of deposits
- 60
Interest is compounded quarterly. Banks and the post office apply their own rounding at each step, so your actual maturity value may differ slightly from this estimate.
How this is calculated
M = R × [(1 + i)^n − 1] ÷ [1 − (1 + i)^(−1/3)], where R is the monthly deposit, i is the quarterly interest rate (annual rate ÷ 400) and n is the number of quarters. This is the standard recurring deposit formula: deposits are monthly but interest is compounded quarterly.
Frequently asked questions
How is RD maturity calculated?
Deposits are made monthly but interest is compounded quarterly, using M = R × [(1 + i)^n − 1] ÷ [1 − (1 + i)^(−1/3)], where i is the quarterly rate and n the number of quarters. Each monthly deposit earns interest for the time remaining until maturity.
How long does a post office RD run?
The National Savings Recurring Deposit Account runs for 5 years, and can be extended. Bank recurring deposits are usually available for anything from 6 months to 10 years.
What is the minimum deposit for a post office RD?
The post office recurring deposit starts at ₹100 a month, with higher amounts in multiples of ₹10. There is no maximum limit.
Why does my bank statement show a slightly different amount?
Banks and the post office apply their own rounding at each compounding step and may treat part-months differently. A difference of a few rupees over a five-year deposit is normal.
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