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Quick Answer: A trading calculator converts your entry, stop loss and target into quantity, maximum loss, target gain and Reward to Risk Ratio. Use it before every order.
Definition: A trading calculator is a tool that shows the rupee gain and loss of a planned trade, so you set the trade size before you enter.
Every week students ask me for a simple trading calculator that shows the gain and loss of a trade before they click buy. This page gives you one, built for Indian markets and Rs amounts. It also explains the maths behind it, so you can check every number yourself.
I am Anil Hanegave, and I teach one habit above all others: know your maximum loss before the order, not after it.
A trading calculator turns three planned prices into rupee figures. You enter Entry (A), Stop Loss (B) and Target (C), add your capital and risk limit, and it returns quantity, maximum loss, target gain and the Reward to Risk Ratio.
The order matters. Most beginners decide the quantity first and the stop loss later, which means the loss is whatever the market decides. A calculator reverses that. You fix the loss you accept, measure the distance from entry to stop loss, and the quantity follows from that.
The inputs are small: direction, capital, risk per trade in percent, entry, stop loss, target and your round-trip costs. The outputs answer the questions that decide a trade. How many units can I buy? What do I lose if I am wrong? What do I gain if I am right? Is the gain large enough compared with the loss?
Place your levels from the chart first. Many students mark them with the daily CPR, which you can get from our CPR Calculator, then bring Entry (A), Stop Loss (B) and Target (C) here. If you need a tool only for quantity, use the Position Size Calculator.
Enter your plan below and the calculator shows quantity, maximum loss, target gain, Reward to Risk Ratio, breakeven price and the win rate you need to break even. The figures are estimates, so check them against your broker’s contract note.
Estimates for education only. Check lot size, costs and margin with your broker before trading.
Risk per unit is the distance from entry to stop loss, and reward per unit is the distance from entry to target. Multiply each by quantity, then adjust for costs to get the net loss and net gain.
Costs include brokerage, STT, exchange charges, GST and stamp duty. They change with the segment and your broker, so I have not hard-coded any rate. Enter your own round-trip total, and verify it on the official charges page of your broker.
For index options, calculate quantity as risk amount divided by risk per unit, then check the current lot size on NSE. The lot size changes from time to time, and your quantity must be a whole number of lots.
With Rs 2,00,000 capital and a 1% risk limit, a trade with entry Rs 500, stop loss Rs 490 and target Rs 530 allows 200 shares. The loss at stop is Rs 2,000 before costs and the gain at target is Rs 6,000, a Reward to Risk Ratio of 1:3.
This is an illustrative example, not a real trade. Suppose my student Vivek studies a stock that has closed above a level he marked from the CPR. That close is his Confirmation. He places Entry (A) at Rs 500, Stop Loss (B) at Rs 490, below the recent swing low, and Target (C) at Rs 530.
| Item | Calculation | Result |
|---|---|---|
| Risk amount | Rs 2,00,000 × 1% | Rs 2,000 |
| Risk per share | 500 − 490 | Rs 10 |
| Quantity | 2,000 ÷ 10 | 200 shares |
| Capital used | 200 × 500 | Rs 1,00,000 |
| Loss at stop (gross) | 200 × 10 | Rs 2,000 |
| Gain at target (gross) | 200 × 30 | Rs 6,000 |
| Net loss / net gain | Rs 200 assumed round-trip cost | Rs 2,200 / Rs 5,800 |
| Breakeven price | 500 + 200 ÷ 200 | Rs 501 |
| Breakeven win rate | 2,200 ÷ (2,200 + 5,800) | 27.5% |
Costs are simplified to one flat figure and slippage is ignored. In real trading both vary, so keep a margin of safety. If Vivek’s trade is stopped out, he loses about 1.1% of capital, which is the number he accepted before the order.
There is no official minimum Reward to Risk Ratio. Many traders look for at least 1:2 as a teaching guideline, but the right number depends on how often your strategy wins and what your costs are.
The ratio and the win rate work together. A higher ratio lets a strategy break even while losing more often than it wins. The table below shows the breakeven win rate before costs, using risk ÷ (risk + reward).
| Reward to Risk Ratio | Breakeven win rate (before costs) |
|---|---|
| 1:1 | 50.0% |
| 1:1.5 | 40.0% |
| 1:2 | 33.3% |
| 1:3 | 25.0% |
Treat this as a floor, not a target. Your real win rate must be measured from your own tested trades, and you should backtest the strategy before risking real money. A 1:3 plan on paper is worth little if your target is rarely reached.
Most calculator errors come from the inputs, not the maths. Wrong stop placement, ignored costs and oversized quantity cause the largest gaps between plan and result.
| Mistake | Practical fix |
|---|---|
| Choosing the stop loss to fit a quantity | Place the stop where the setup is invalid on the chart, then reduce quantity. |
| Setting the target only to reach 1:3 | Use a level the chart supports, such as a pivot or CPR level. If it gives less than your rule, skip the trade. |
| Ignoring costs on small targets | Enter round-trip costs. On tight targets they can remove a large share of the gain. |
| Using the same risk % after losses | Keep a fixed rule, and cut risk if you break your daily limit. |
| Moving the stop loss away | Decide the stop before entry and do not widen it. Re-run the calculator for any new plan. |
Mentor suggestion: I keep one rule for students. Run the calculator before the order, write the maximum loss on paper, and place the stop loss immediately after entry. Our Stop-Loss Calculator helps you size the exit across options, stocks and commodities.
Tick every item before you place an order. If one item fails, the trade is not ready.
Do not trade when there is no clear setup, when the stop loss would be wider than your risk limit allows, or when the numbers only work after you move the target to an unrealistic level.
The no-setup condition is simple. If you cannot name your Entry (A), Stop Loss (B) and Target (C) from the chart in one minute, stay out. Avoid trading just after a large unexpected move, and avoid it when you are trying to recover an earlier loss. A calculator reports the maths of a plan. It cannot tell you whether the plan is sound. For a wider view, see our full list of free trading calculators.
A trading calculator converts your planned entry, stop loss and target into quantity, maximum loss, target gain and Reward to Risk Ratio, so you know the numbers before you place the order.
Multiply the price distance by quantity. For a long trade, loss at stop is (Entry − Stop Loss) × quantity, and gain at target is (Target − Entry) × quantity. Then adjust both for costs.
Yes. It uses Rs amounts and works with NSE and BSE stocks, NIFTY and BANK NIFTY, and commodity prices. For index derivatives, check the current lot size on NSE.
It includes one round-trip cost figure that you enter. Brokerage, STT, exchange charges, GST and stamp duty vary, so verify them on your broker’s contract note.
Yes. Choose Short in the direction field. Stop loss must then be above entry and target below entry.
There is no official minimum. 1:2 is a common teaching guideline, and it needs a win rate above about 33% before costs. Test your own strategy to find the number that works for you.
Pick the levels from the chart, then let the calculator set the size. If the Reward to Risk Ratio, the net result after costs and the maximum loss all fit your tested rules, the trade is ready. If not, wait. Nothing here is advice, and no outcome is assured.
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Related reading: All free calculators • Stop-Loss Calculator • Option Selling Calculator • Support and Resistance vs CPR