Quick examples
Shares to Buy
200
Position Value
$20,000
Amount at Risk
$1,000
Position Size Calculator — Quick Reference
The Position Size Calculator is an online tool that calculate optimal position size based on account risk and stop loss. Everything for the Position Size Calculator is on this page: the interactive calculator, the formula, a worked example, step-by-step guidance, and frequently asked questions — no other pages required.
At a glance
- Main inputs
- Entry and exit prices
- Quantity or position size
- Fees and risk parameters
- Main outputs
- Profit or loss
- Return percentage
- Risk-reward ratio
Direct answers
What is the Position Size Calculator?
The Position Size Calculator is an online tool that calculate optimal position size based on account risk and stop loss.
What formula does the Position Size Calculator use?
Shares = (Account size × risk %) / (Entry price − Stop loss price)
How does the Position Size Calculator work?
Shares = (Account × Risk%) / (Entry − Stop Loss). Limits loss to your risk tolerance.
Formula Used
The equation below is what this calculator applies. Variable definitions follow when symbols are used.
Equation
Shares = (Account size × risk %) / (Entry price − Stop loss price)
Worked Example: ₹10L account, 1% risk, ₹500 entry, ₹470 stop
Sample inputs and the results this calculator produces for the scenario below.
Inputs
- Account Size
- $1,000,000
- Risk per Trade
- 1%
- Entry / Stop
- ₹500 / ₹470
Results
- Position Size
- ~333 shares
Risk-based sizing limits loss to your chosen percentage if the stop hits — never risk more on a single trade than your plan allows.
How Position Size Calculator Works
Shares = (Account × Risk%) / (Entry − Stop Loss). Limits loss to your risk tolerance.
What to enter
Use the calculator above to set your amounts, rates, and tenure. Results update as you move sliders or type values — switch currency if you are planning in USD, INR, or another supported unit.
Step-by-step
- Open the Position Size Calculator and enter your amounts, rates, and time period in the input fields.
- Review the results panel — totals update instantly when you change any value.
- Compare the worked example and formula below to verify the math matches your scenario.
- Read the FAQs for common edge cases, tax notes, and planning tips specific to this calculator.
Position Size — Frequently Asked Questions
Each question is answered directly below. Expand any item for the full response.
How does a position size calculator work?
It starts with the amount of capital you are willing to lose on the trade and divides that by the risk per unit between entry and stop loss. This converts a trading idea into a disciplined size instead of an emotional guess.
Why do traders often cap risk at 1% to 2% per trade?
A low per-trade risk helps preserve capital through losing streaks and reduces the chance of one bad trade damaging the account badly. Survival is a core part of trading performance.
What happens if I widen the stop loss?
The position size should usually shrink, because each share or unit now carries more risk. Keeping the same size with a wider stop means risking more money than planned.
Should position size ignore slippage and charges?
No, active traders should include some buffer for slippage, gaps, and transaction costs. Otherwise the actual loss on a stopped-out trade can be higher than the intended risk.
Disclaimer
- This calculator gives you an estimate only. It is not a promise of exact results.
- This is general information, not personal financial, tax, or legal advice.
- You are responsible for your own decisions. Talk to a qualified professional when it matters.
- Trading and investing involve risk. You can lose money.
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