A girl's Sukanya Samriddhi account grows to about ₹71.82 lakh at 21 years on ₹1.5 lakh a year at 8.2%. Deposits run for 15 years; the last six years only earn interest.
What this calculates
Enter how much you deposit each year, the girl's age when the account opens and the interest rate, and this works out the maturity value 21 years after opening, with the total deposited, the interest earned and a year-by-year table. The rate is set by the government every quarter; the scheme itself is run through India Post and National Savings Institute and authorised banks.
The formula
Years 1 to 15
balance = (last year's balance + this year's deposit) × (1 + rate)Years 16 to 21
balance = last year's balance × (1 + rate)The rate is the yearly rate as a decimal (8.2% is 0.082). This assumes each deposit is made by 5 April, so it earns interest for the whole year; interest is credited at the end of each financial year, rounded to the rupee.
Worked example
₹50,000 a year grows to about ₹23.94 lakh, and ₹1,000 a month (₹12,000 a year) to about ₹5.75 lakh. The girl's age does not change the amount; it shows how old she will be at the last deposit and at maturity.
When to use it, and the mistakes to avoid
Use it to plan for a daughter's education or marriage, to see what a smaller yearly deposit reaches, or to compare Sukanya Samriddhi with PPF or an FD.
The mistakes that cost the most:
- Depositing after the 5th. A deposit on 6 April misses April's interest.
- Going over ₹1.5 lakh. Deposits above the yearly limit are not accepted.
- Missing a year's deposit. An account with no deposit in a year is treated as defaulted; it needs at least ₹250 and a small penalty to revive.
- Assuming the rate is fixed. It is reset every quarter; the result changes if it moves.
- Expecting deposits after year 15. They stop; the balance only earns interest until maturity.
FAQ
What is the Sukanya Samriddhi interest rate now?
8.2% a year for October-December 2026, compounded yearly. The Ministry of Finance reviews it every quarter and left it unchanged on 30 September 2026. Change the rate in the calculator to try another.
How much will ₹1.5 lakh a year grow to in Sukanya Samriddhi?
About ₹71.82 lakh at maturity, 21 years after the account is opened, if each deposit is made by 5 April. You put in ₹22.5 lakh over 15 years, so ₹49.32 lakh is interest.
For how long can I deposit, and when does the account mature?
Deposits are made for 15 years from the day the account is opened. The account matures 21 years after it is opened, and the balance keeps earning interest for the last six years with no deposits.
How much can I deposit, and until what age can the account be opened?
At least ₹250 and at most ₹1,50,000 in a financial year, in multiples of ₹50. A guardian can open the account for a girl from birth until she is ten years old, one account per girl.
Does it matter which month I deposit in?
Yes. Interest for each month is worked out on the lowest balance between the 5th and the month end, so money that arrives after the 5th earns nothing for that month. Depositing the whole year's amount by 5 April earns interest on it for all twelve months, which is what this calculator assumes.