Math
Standard Deviation Calculator
Calculate standard deviation, variance, and mean from a data set. Population and sample. Free calculator.
In this article
Concept
How spread out data is from mean। Low SD: clustered। High: spread। Nifty 50 annual volatility: ~15-20%। 68% data within ±1 SD। 95% within ±2 SD。
Finance
Mutual fund SD: risk measure। Lower SD = more stable returns. SBI Bluechip: ~15% SD। Smallcap: ~25% SD。
⚡ CalcWolf Insight
In investing, standard deviation IS risk. The S&P 500 has a historical SD of 15-16%, meaning a 30% swing in either direction is a once-per-generation event — but it does happen.
Frequently asked questions
What is SD?▾
Average distance from mean। Higher = more volatile/risky。
MF risk?▾
SD as risk proxy। Large cap ~15%। Small cap ~25%। Higher SD = higher risk + potential return。
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