Position Size Calculator
Calculate exactly how many shares, F&O lots, or crypto units to trade based on your account size, risk per trade, and stop-loss distance — built for Indian stocks, Nifty/Bank Nifty F&O, and crypto. Free, instant, no signup.
The calculators on this site are for informational and educational purposes only and do not constitute investment advice. TradeCalc is not a SEBI-registered investment advisor. Please consult a qualified financial advisor before making investment decisions.
Position size is rounded down to a whole share — rounding up would mean risking more than the percentage you entered.
Position size
50 shares
Rounded down from risk amount ÷ risk per unit.
Risk amount
₹1,000.00
1% of your ₹1,00,000.00 account.
Total position value
₹25,000.00
Quantity × entry price.
% of account capital deployed
25.0%
Different from risk % — this is total exposure, not just what's at risk to the stop-loss.
All calculations run entirely in your browser — nothing you enter here is sent to a server or stored anywhere.
Why position sizing matters
Risk management starts before you enter a trade
Two traders can take the exact same setup — same entry, same stop-loss — and end up with completely different outcomes for their account simply because they sized the position differently. Position sizing answers a single question before you ever place the order: given how much you're willing to lose if the stop-loss is hit, how large should this position actually be?
The 1–2% guideline
A commonly cited starting point among retail traders is to risk no more than 1–2% of total account capital on any single trade. At 1% risk, a string of ten straight losing trades costs roughly 10% of the account, not a catastrophic drawdown; at a much higher risk %, the same losing streak could be ruinous. This is general, widely-published risk-management education — not personalized advice, and not a guarantee against losses.
Risk % vs. capital deployed — two different numbers
It's easy to focus only on the risk % and lose sight of how much total capital a trade actually ties up. A very tight stop-loss lets you buy a much larger quantity for the same risk amount — which can mean the position quietly consumes a large share of your account's total capital, even though the risk % looks small. This calculator shows both numbers side by side specifically so that doesn't happen unnoticed.
Works the same way across stocks, F&O, and crypto
The underlying formula — risk amount ÷ risk per unit, rounded down — is identical whether you're sizing an equity delivery trade, an options or futures position (scaled by lot size), or a crypto position. Only the units change: shares, lots, or coins.
Frequently asked questions
How much should I risk per trade?
There's no universal answer, but a widely cited guideline among retail traders is to risk no more than 1–2% of total account capital on any single trade. Risking a small, consistent percentage means a string of losing trades doesn't meaningfully damage the account, while still allowing enough position size for wins to matter. This is general risk-management education, not a recommendation for your specific situation.
How do I calculate position size for options?
Select "Nifty / Bank Nifty F&O" as the asset class, pick the symbol (or enter a custom lot size for a stock option), and enter your entry price, stop-loss price, account size, and risk %. The calculator divides your risk amount by (risk per unit × lot size) and rounds down to a whole number of lots — the same risk-based logic as equity, just scaled by the lot size.
What's the difference between risk % and position size?
Risk % is how much of your account you're willing to lose if the stop-loss is hit — it depends on the distance between your entry and stop-loss. Position size (and the resulting % of capital deployed) is how much total capital the trade ties up, which depends on the entry price itself, not the stop-loss distance. A tight stop-loss lets you buy a much larger quantity for the same risk %, which can mean a large percentage of your capital is deployed even though the risk % is small — that's exactly why this calculator shows both numbers separately.
Does this calculator account for margin?
No — this calculator sizes a position based on risk (how much you're willing to lose to the stop-loss), which is a separate constraint from margin (how much your broker requires you to post for an F&O position). For an approximate margin estimate, use the F&O Margin Calculator — and check both before placing a trade, since risk-based position size and available margin can each independently limit how large a position you can actually take.
Is this a crypto position size calculator too?
Yes — select "Crypto / Other" as the asset class and the same risk-based math applies: risk amount ÷ risk per unit, rounded down to a whole unit. The calculator doesn't distinguish crypto from any other plain quantity-based asset; it's the same formula stocks use, without lot sizes.
Is this position size calculator free?
Yes — it's free, runs entirely in your browser, and requires no signup. Nothing you enter is sent to a server or stored anywhere.
Next steps: entry levels, margin, and brokers
Looking for a reference entry or stop-loss level? The Pivot Point Calculator gives you support/resistance levels to work from. For F&O, remember that risk-based position size and available margin are two separate constraints — check both with the F&O Margin Calculator before placing a trade. See each broker's own charges before choosing where to trade:
Or use the Brokerage Calculator to compare brokerage and other charges across all brokers side by side.
Learn more: Position Sizing for Indian Traders — connecting stop-loss levels to risk-based sizing.