Compound Interest and Savings Calculator
One calculator for ₹, $, £, C$ and A$. The currency you pick changes the symbol, the number style and the starting inflation figure. Nothing is converted.
How this calculator works
The nominal yearly rate is divided by the number of compounding periods, then converted to an equal monthly growth rate: (1 + rate ÷ n)n ÷ 12 − 1. One monthly rate is used for the whole calculation, for both your starting amount and every contribution.
Each deposit grows from the month it is made. Monthly contributions land every month. Annual contributions land at months 12, 24, 36 and so on (end of period) or at months 0, 12, 24 and so on (beginning of period). The duration is rounded to the nearest whole month.
Real accounts differ in when they credit interest, so a bank statement can differ slightly from this projection. The savings-goal solver uses the same engine as the forward calculation, so its answer always reproduces your target.
Country context
India, SIP: A Systematic Investment Plan (SIP) invests a fixed sum every month. Choose monthly contributions and monthly compounding and this calculator gives a simplified SIP-style projection at a constant rate. Real SIP returns vary with the market. This calculator shows the underlying growth math; it does not model account-specific tax rules or contribution limits.
United States, 401(k) and Roth IRA: Traditional 401(k) contributions are usually made before tax and taxed on withdrawal, while Roth accounts take after-tax money and allow qualified withdrawals tax-free. This tool shows pre-tax growth only. This calculator shows the underlying growth math; it does not model account-specific tax rules or contribution limits.
United Kingdom, ISA: Growth inside an ISA is free of UK income tax and capital gains tax, and you can only pay in up to the annual ISA allowance, which the government sets each tax year. This calculator shows the underlying growth math; it does not model account-specific tax rules or contribution limits.
Canada, TFSA and RRSP: TFSA contributions come from after-tax money and withdrawals are tax-free. RRSP contributions are tax-deductible and withdrawals are taxed as income. The growth math is the same in both; the tax timing is not. This calculator shows the underlying growth math; it does not model account-specific tax rules or contribution limits.
Australia, Superannuation: Super has compulsory employer contributions (the Super Guarantee), tax rules of its own and access restrictions until you reach preservation age, so it works differently from a voluntary savings plan. This calculator shows the underlying growth math; it does not model account-specific tax rules or contribution limits.
Why does a higher compounding frequency increase my result?
With a positive rate, the yearly rate is split across more periods, so interest is added to the balance sooner and starts earning interest earlier. For the same nominal rate the order is annual, semi-annual, quarterly, monthly, then daily, with each step adding a little less than the last.
With a negative rate in Investment mode, the same order still holds, but it works in your favour. The yearly loss is split into smaller pieces, and each piece is taken from a balance that has already shrunk, so the total loss is slightly smaller. The difference is small. At -5% nominal, 1,000 falls to 950.00 after one year with annual compounding and to about 951.23 with daily compounding.
What is the difference between Savings and Investment mode?
Savings mode labels the output as estimated interest and does not accept a negative rate. Investment mode labels it as estimated growth and accepts a negative rate. Investment returns are not guaranteed and can be negative. Neither mode predicts or guarantees an outcome.
Does this calculator account for taxes?
No. It shows pre-tax, pre-fee growth only. Taxes, fees and account rules differ by country and by account type.
Disclaimer: This calculator provides estimates based on the rate and assumptions you enter. It does not predict actual investment returns, which vary and can be negative. It does not account for taxes, fees, or account-specific rules in any country.
Sources: Default inflation figures are each central bank's published target, not a forecast: RBI 4% (framework retained for April 2026 to March 2031), US Federal Reserve 2%, Bank of England 2%, Bank of Canada 2% (framework renewal due in 2026), Reserve Bank of Australia 2 to 3% (2.5% midpoint used). Last reviewed 29 September 2026.
Read our full disclaimer and methodology and sources.
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