Risk Per Trade Calculator: Rupee Risk and Whole Lots

Risk per trade = trading capital × chosen risk percentage ÷ 100. To calculate whole lots, divide that rupee budget by Stop Loss Points × units per lot, then round down. This risk per trade calculator shows both the budget and the planned price loss for its rounded lots. Its Survival Rate means the percentage of capital remaining in an assumed losing streak, rather than a probability of survival.

Choose a budget before translating it into quantity

Total Trading Capital sets the base for your percentage. Risk Percentage is the share of that base you choose as a loss budget. It is different from the amount invested, the premium paid or the margin blocked for an order. This calculator does not use an entry price or calculate buying power.

CME’s educational material describes percentage risk limits and explicitly says its example threshold is arbitrary. A preset in a calculator is a planning choice. This page does not establish a regulatory risk percentage or confirm that a budget suits your circumstances.

CME also links position sizing to a defined stop and the amount or percentage of capital chosen for risk. Calculate the distance from your planned entry to that stop first. Choosing a smaller distance only to obtain more lots changes the loss plan rather than improving the arithmetic.

How to calculate risk per trade by hand

You can check the calculator with a pencil. There are three steps.

1. Rupee budget = capital × risk percentage ÷ 100.
2. Risk per lot = stop distance in points × units per lot.
3. Lots = budget ÷ risk per lot, rounded down to a whole number.

Here is a made-up Nifty futures plan. Capital is ₹2,00,000, risk is 1% and the stop is 40 points away. The budget is 2,00,000 × 1 ÷ 100 = ₹2,000. The NIFTY lot in the checked series is 65 units, so risk per lot is 40 × 65 = ₹2,600. Budget divided by risk per lot is 0.77, which rounds down to 0 lots. The same plan with ₹5,00,000 gives a budget of ₹5,000, so 5,000 ÷ 2,600 is 1.92, which rounds down to 1 lot, with planned price risk of ₹2,600. Both accounts use the same percentage, yet only one can place a whole lot at this stop. This is an example, not a suggestion to trade.

The actual fields and outputs

• Instrument: an index contract label that selects the stored units per lot.
• Total Trading Capital: the rupee capital base for the risk percentage.
• Risk Percentage: your chosen percentage of that capital.
• Stop Loss Points: the price distance to the planned stop, rather than the stop’s price level.
• Survive Consecutive Losses: the number of full-percentage losing trades in a separate illustration.

Max Risk Per Trade is the entered capital times the selected percentage. Risk Per Lot is stop distance times units per lot. Maximum Lots is the whole-lot count that fits the budget. Actual Risk (rounded lots) is the planned price loss for that final count, before fees and execution differences.

Lot Size shows the quantity used in the calculation. Some BSE menu labels disagree with that card because the stored quantities differ from the labels. Check the actual contract and displayed quantity before relying on the result. This page has no manual lot override.

The remaining cards, Capital After Losing Streak, Survival Rate % and Max Drawdown %, belong to a separate percentage-loss scenario. They do not use the rounded lot count. Risk Level Assessment uses preset descriptions tied to the entered percentage. It does not measure how a strategy has performed.

Match stop points to the instrument being traded

For a futures stop, enter the futures-price distance. Multiplying it by the lot’s units gives planned rupee price risk. For an option-premium stop, use a change in the option’s own premium. An underlying-index stop cannot be treated as an equal premium change in an option.

The form has no option-sensitivity input, margin input, fee field or portfolio exposure field. It also has no ordinary-share instrument choice. Use the stock position size calculator when the question is cash-share quantity rather than index lots.

Choosing a risk percentage

This page does not tell you which percentage to use. Nobody can know your income, your other savings or how you cope with losing trades. What it can show is what a percentage does to your account over a run of losses. A smaller percentage leaves more capital after the same streak, and a larger one removes it fast. Fixed-fractional risk means you risk the same share of your current capital on each trade, so the rupee amount shrinks after a loss and grows after a gain.

Many traders write the percentage into a trading plan, then count how often they break it. A plan that is broken after two losses is not a plan. The risk management guide and the glossary entry on risk management go deeper on this.

Worked example: budget and rounded-lot risk

Assume a fictional Bank Nifty futures plan with ₹4,00,000 capital, Risk Percentage 1.5%, Stop Loss Points 80 and Survive Consecutive Losses set to 2. Select Bank Nifty. The checked BANKNIFTY lot is 30 units. No live price or suggested trade is implied.

The budget is 4,00,000 × 1.5 ÷ 100 = ₹6,000. Risk per lot is 80 × 30 = ₹2,400. The budget fits 2.5 lots before rounding, so Maximum Lots is 2 and the quantity is 60 units. Actual Risk is 2 × 2,400 = ₹4,800, leaving ₹1,200 of unused budget.

If the same fictional account chose a 200-point futures stop, each lot would carry ₹6,000 of planned price risk, fitting 1 lot. With a 250-point stop, each lot would carry ₹7,500 and no complete lot would fit. A zero-lot result expresses the budget constraint; it does not mean that a fractional index lot is available.

Read Survival Rate as remaining capital

In the first example, the losing-streak calculation assumes the full 1.5% of remaining capital is lost on each of 2 trades. After the first loss, capital is 4,00,000 × 0.985 = ₹3,94,000. After the second, it is 3,94,000 × 0.985 = ₹3,88,090.

That leaves 97.02% of starting capital and a drawdown [fall from starting capital] of 2.98% after display rounding. It does not say that the account has a 97.02% chance of surviving, and it is not the largest drawdown the account could experience.

This scenario also differs from keeping the example’s rounded quantity unchanged. Losing ₹4,800 twice would leave ₹3,90,400 before charges, rather than the displayed ₹3,88,090. The difference comes from using rounded-lot losses versus the tool’s full-percentage losses, not an observed trading result.

There is no input for win rate, the range of possible gains and losses, or past trades. The form cannot estimate how likely the assumed streak is. For an equity-history question, use the maximum drawdown calculator with its own input limits.

Losing streak table: capital left at different risk levels

The table uses the same method as the calculator's Survival Rate: the full percentage of remaining capital is lost on each trade in a row. It shows how much of starting capital remains. It does not say how likely such a streak is.

Read across the rows. At 10% a run of 10 losses leaves about 34.87% of starting capital, so the account would need to nearly triple to get back. At 1% the same run leaves about 90.44%. These are plain arithmetic outputs, not forecasts. Real losses differ in size, and costs make them larger.

What can push a realised loss above the plan

A stop price is a planned exit condition. The SEC explains that a triggered stock stop becomes a market order and that market orders do not guarantee their execution price. Check the order type and handling available in your own market and broker account. This form does not place an order or guarantee an exit.

Charges also consume part of the budget. The tool does not reserve them before sizing. If you need a budget including costs, check planned price loss plus estimated round-trip charges independently. Several open positions can also lose together, while this form only sizes a single position.

For a volatility-based stop assumption, see volatility based position sizing. Keep the capital, instrument, stop basis, lot quantity and planned price loss in your trade record so that you can compare the plan with the actual exit. OneTradeJournal stores that information through manual logging.

Risk per trade versus a forex or general risk calculator

People also search for a forex risk calculator, a trading risk calculator or a general risk management calculator. They answer the same basic question: how big can the position be if the stop is hit. A forex calculator usually works in pips and lot values in a base currency. This one works in index points, units per lot and rupees, and its Instrument list holds Indian index contracts only. For currency pairs, shares or crypto, use the matching tool: the forex position size calculator or the crypto position size calculator.

For a longer walk through the same idea, read how to calculate position size. To judge whether a stop is wide enough for the market's usual movement, see the ATR calculator.

Record the plan so you can check it later

A risk number is only useful if you compare it with what happened. After each trade, write down planned risk, actual loss and whether you kept the stop. OneTradeJournal lets you log stop, target, strategy, emotions, mistakes and notes by hand, and it estimates charges per trade. It does not connect to a broker or place orders, so the numbers are what you type.

Sources

• NSE: Market lot sizes by expiry month (checked 15 October 2026).
• CME Group: Risk percentage as a chosen limit (checked 15 October 2026).
• CME Group: Proper Position Size (checked 15 October 2026).
• SEC Investor.gov: Types of Orders (checked 15 October 2026).