Calculator handbook
What every field means—and where errors begin.
Most sizing mistakes are not caused by division. They come from mixing units: treating a tick like a point, assuming every “lot” is identical, or using a quote-currency value as if it were already converted into the account currency. This guide makes those assumptions visible.
Written and reviewed by Strategy Archive. Substantially updated August 27, 2026. See our editorial standards.
01 / Pick the right tool
Which trading calculator should you use?
Start with the question you need answered. “How large can this order be?” is a position-sizing problem. “Did this strategy make money consistently?” is a sample-analysis problem. Combining them usually creates false precision.
| Calculator tab | Use it when | Input most worth checking |
|---|---|---|
| Position Size | You know the entry and stop and need the maximum quantity for an index, metal, crypto asset, share, commodity, or custom instrument. | Value of a 1.00 price move for one unit or contract |
| FX / Pairs | You need forex lot size, position units, stop distance in pips, and pip value in the account currency. | Pip size, units per lot, and quote-to-account conversion |
| Trade P&L | You want to estimate or review the gross and net outcome of a long or short trade, including entered costs. | Quantity, point value, and total round-trip costs |
| System Performance | You have a complete sample of wins and losses and want expectancy, profit factor, break-even win rate, and net R. | Consistent R-multiples and a sample that includes every trade |
| Drawdown | You want the decline from an equity peak, the return needed to recover, and the change in money risked per trade. | A genuine previous peak and current account equity |
| Compounding | You want to explore repeated percentage returns and optional fixed contributions over a number of periods. | A consistent period definition and assumptions that are scenarios, not forecasts |
02 / Position sizing
Position size starts with the stop, not the other way around
The calculator first converts your risk percentage into money. A USD 10,000 account with a 1% limit has a USD 100 risk budget. It then asks how much one unit would lose between entry and stop. If that loss is USD 2 per unit, the result is 50 units.
This is why a stop cannot be chosen for cosmetic reasons. It should sit at a market level that invalidates the trade idea. Once the stop is defined, position size adapts to it. A wider stop produces a smaller position; a tighter stop produces a larger one, assuming every other input stays the same.
Finally, the broker's order increment matters. If the calculator returns 0.237 lots and the venue accepts steps of 0.01, 0.23 stays below the planned ceiling while 0.24 moves above it. The same principle applies to whole-share accounts and fixed contract quantities.
03 / Units that get confused
Pip vs point vs tick: similar words, different contracts
These words all describe price movement, but they are not interchangeable. The safest definition is always the one attached to the exact instrument at the broker or exchange where you trade.
| Term | What it usually means | Example | What to verify |
|---|---|---|---|
| Pip | A conventional forex movement unit. | EUR/USD: 0.0001 is normally one pip. USD/JPY: 0.01 is commonly one pip. | Pip size, lot units, and conversion into the account currency. |
| Point | A general price-unit move; some platforms also use it for the final displayed decimal. | An index moving from 20,000 to 20,001 has moved one index point. | How much a 1.00 move is worth for one unit or contract at your venue. |
| Tick | The smallest permitted price increment for a particular instrument. | A futures contract with a 0.25 tick can quote 100.00, 100.25, 100.50, and so on. | Both tick size and the money value of one tick for the exact contract month or product. |
What is a pip?
For most currency pairs, one pip is the fourth decimal place: a move from 1.0840 to 1.0841. For many yen pairs, it is the second decimal place: 156.20 to 156.21. If a platform quotes a fifth or third decimal, that last digit is commonly a tenth of a pip, sometimes called a pipette.
What is pip value?
Pip value answers a different question: how much money does one pip represent for this position? In the quote currency, it is position units multiplied by pip size. If the account uses another currency, that amount must then be converted.
04 / Worked examples
Four examples you can reproduce in the calculator
The numbers below are deliberately plain. Their purpose is to make the calculation auditable, not to represent a market forecast or a recommended risk level.
Example A / Generic position size
USD 10,000 account, 1% risk, two-point stop
- 1. Risk budget: 10,000 × 1% = USD 100.
- 2. Entry 100, stop 98: stop distance = 2.00.
- 3. If one unit gains or loses USD 1 per 1.00 move, risk per unit = USD 2.
- 4. Position size: 100 ÷ 2 = 50 units.
- 5. Target 104 is four points away: potential gross reward = USD 200, or 2:1.
Example B / EUR/USD lot size
USD account, 50-pip stop, standard-lot basis
- 1. USD 10,000 × 1% = USD 100 risk budget.
- 2. Entry 1.1000 and stop 1.0950 = 0.0050, or 50 pips.
- 3. 100,000 units × 0.0001 = USD 10 per pip for one standard lot.
- 4. One lot would risk 50 × 10 = USD 500.
- 5. Lot size: 100 ÷ 500 = 0.20 lots, or 20,000 EUR units.
This convenient USD 10 pip value applies because USD is both the quote and account currency. A cross such as EUR/GBP in a USD account needs a current GBP-to-USD conversion.
Example C / Expectancy
A lower win rate can still produce positive expectancy
- 1. Sample: 40 winners and 60 losers.
- 2. Average winner: +2R. Average loser: -1R.
- 3. Expectancy: (0.40 × 2) − (0.60 × 1) = +0.20R per trade.
- 4. Profit factor: 80 winning R ÷ 60 losing R = 1.33.
- 5. At USD 100 per R, the historical sample totals +USD 2,000 before omitted costs.
Example D / Drawdown
Why recovery is larger than the original loss
- 1. Previous equity peak: USD 12,000.
- 2. Current equity: USD 9,600.
- 3. Drawdown: 2,400 ÷ 12,000 = 20%.
- 4. Recovery: 2,400 ÷ 9,600 = 25%.
- 5. At 1% risk, the money risk unit falls from USD 120 at the peak to USD 96 now.
05 / Reading performance
Win rate alone does not describe a trading system
Expectancy
Expectancy combines how often the sample won with the average size of its wins and losses. A positive value means the recorded sample earned R on average; it does not prove the next trade will be profitable or that the edge will persist.
Profit factor
Profit factor is gross winning R divided by gross losing R. A value above one means the sample's gross wins exceeded its gross losses. Missing fees, selective records, and one unusually large winner can distort it.
Break-even win rate
With average wins of 2R and losses of 1R, the theoretical break-even rate is 1 ÷ (1 + 2), or 33.3%, before costs. Real results depend on the actual distribution of outcomes, not the target printed on a trade plan.
A note about Kelly sizing
The System Performance tab shows the full Kelly estimate as a mathematical diagnostic, not a position-size recommendation. Kelly is highly sensitive to estimated win rate and payoff. A short or unrepresentative sample can produce an aggressive number that is unsuitable for real trading.
| Drawdown | Capital remaining | Gain needed to recover |
|---|---|---|
| 10% | 90% | 11.11% |
| 20% | 80% | 25% |
| 30% | 70% | 42.86% |
| 50% | 50% | 100% |
| 75% | 25% | 300% |
06 / Plain-English glossary
Trading calculator terms without the sales pitch
- Account balance and equity
- Balance is normally the account value after closed trades. Equity usually includes unrealized profit and loss from open positions. Brokers may label these figures differently. Use whichever one your risk plan names, and keep that choice consistent.
- Position size and quantity
- Position size is the amount of the instrument being traded: units, shares, contracts, coins, or lots. It is the variable the calculator reduces when the stop becomes wider or the risk limit becomes smaller.
- Lot
- A lot is a trading quantity convention. In spot forex, a standard lot commonly represents 100,000 units of the base currency, a mini lot 10,000, and a micro lot 1,000. Other products and brokers can define a lot differently.
- Base and quote currency
- In EUR/USD, EUR is the base currency and USD is the quote currency. A price of 1.1000 means one euro is priced at 1.10 US dollars. A raw pip value is first expressed in the quote currency.
- Stop-loss and invalidation
- The invalidation price is where the original trade idea is no longer valid. A stop-loss is the order intended to exit there. In fast or illiquid markets, the fill can be worse than the stop price, so planned risk is not a guaranteed maximum loss.
- Risk amount and risk percentage
- Risk amount is the money planned to be lost if the stop executes at the entered price. Risk percentage is that amount divided by the chosen account balance or equity. The calculator does not prescribe a suitable percentage.
- R and R-multiple
- One R is the initial planned risk on a trade. If USD 100 is at risk, a USD 200 profit is +2R and a USD 100 loss is -1R. R-multiples make trades with different account sizes and stop distances easier to compare.
- Reward-to-risk ratio
- This compares planned profit with planned loss. A target worth USD 300 against USD 100 of risk is 3:1, or 3R. It describes the shape of one plan, not the probability that the target will be reached.
- Notional exposure
- Notional is the total market value represented by the position. It can be much larger than cash posted as margin. Notional exposure is useful for seeing concentration, but it is not the same as the amount lost at the stop.
- Leverage and margin
- Leverage is exposure relative to account capital. Margin is the capital a venue requires to hold that exposure. Margin rules can change and do not replace stop-based risk: a small margin deposit can still control a much larger position.
- Spread, commission, slippage, and financing
- Spread is the difference between bid and ask; commission is a separate transaction charge; slippage is the difference between intended and filled price; financing or swap is a holding cost. All can turn a theoretical break-even trade into a net loss.
- Expectancy and profit factor
- Expectancy estimates the average R earned or lost per trade in a sample. Profit factor divides gross winning R by gross losing R. Both are historical sample statistics, and both can look impressive when the sample is small or costs are missing.
- Drawdown and recovery
- Drawdown measures the fall from a previous equity peak. Recovery is the percentage gain from current equity needed to regain that peak. Because the recovery starts from a smaller base, it is always larger than the drawdown percentage when a loss exists.
- Compounding
- Compounding means each period's percentage return is applied to the new balance, so earlier gains or losses affect later results. A smooth repeated return is useful for scenario testing but is not how real trading results usually arrive.
07 / Limits
What the result cannot know
The calculator has no live broker connection. It cannot see the bid/ask spread, depth of market, changing margin requirements, open portfolio exposure, a weekend gap, or whether a stop fills at the requested level. Presets help with setup, but the current broker specification remains the authority for contract size and order increments.
- No live price or exchange-rate feed
- No automatic commission or financing schedule
- No margin-call or liquidation simulation
- No portfolio correlation or aggregate-risk check
- No guarantee that a stop fills at its trigger price
- No assessment of whether the trade idea has an edge
08 / Common questions
Trading calculator FAQ
01What is a pip in forex trading?
A pip is a standard unit used to describe a currency pair's price movement. For most pairs one pip is 0.0001; for many pairs quoted in Japanese yen it is 0.01. Some platforms show an extra decimal place, often called a pipette or fractional pip.
02How do I calculate position size?
First calculate the money at risk: account balance multiplied by risk percentage. Then divide that amount by the loss per unit between entry and stop. The loss per unit depends on stop distance and the broker's point, tick, pip, or contract value.
03How is forex pip value calculated?
Pip value in the quote currency equals position units multiplied by pip size. To display it in the account currency, multiply by the current quote-to-account conversion rate. For a 100,000-unit EUR/USD lot and a 0.0001 pip, the pip value is USD 10 when the account currency is USD.
04What lot size should I use?
There is no universal lot size. It should come from the account risk limit, stop distance, pip value, and broker size increment. A wider stop normally requires a smaller position if the money at risk stays unchanged.
05What is the difference between a pip, point, and tick?
A pip is a forex movement convention, a tick is the smallest price increment permitted for a particular market, and point is a broader term whose meaning varies by instrument and broker. Always use the definition and monetary value shown in the contract specification for the venue where the order will be placed.
06What does a 2:1 reward-to-risk ratio mean?
It means the planned profit at the target is twice the amount lost if the stop is reached. Before costs, a strategy averaging 2R winners and 1R losers has a theoretical break-even win rate of about 33.3 percent. It says nothing about how often either outcome will occur.
07Why does a 20 percent drawdown need a 25 percent recovery?
After a 20 percent loss, only 80 percent of the previous peak remains. Returning from 80 to 100 requires a gain of 20 on a base of 80, which is 25 percent. The percentage needed to recover grows faster as drawdown deepens.
08Does the trading calculator use live market prices?
No. Prices, exchange rates, fees, and contract values are entered by the user. This makes the formulas auditable and supports broker-specific symbols, but every market-sensitive input must be checked before an order is placed.
09Can I use the calculator for gold, indices, shares, commodities, and crypto?
Yes. The Position Size and Trade P&L calculators work with any instrument when the entered value per 1.00 price move matches the broker's contract. Presets are a starting point, not a substitute for the current instrument specification.
10Why is the result different from my broker's calculator?
The usual causes are a different contract size, tick value, account-currency conversion, bid or ask price, spread, commission, minimum size step, or rounding method. Compare every input with the broker's specification before assuming either result is wrong.
11Is the calculator a trading signal?
No. It does not decide whether a setup is valid or predict direction. It only calculates outcomes from the prices, risk limit, performance sample, or growth assumptions entered by the user.
09 / Methodology
How this guide was checked
Every worked example was recalculated against the formulas used by the six interactive modules. Definitions were checked against primary educational or regulatory material. Broker-specific values remain editable because a universal point value or margin rule would be misleading.
For contract terminology, see the CME Group's educational explanation of futures price increments. OANDA's pip guide documents the common four-decimal, yen-pair, and pipette conventions used in the examples. For leverage and margin risk, see the US Commodity Futures Trading Commission's customer advisory. Forex conventions should still be confirmed in the documentation of the broker that will execute the order.
Put the calculation inside a written process
Position size is one line in a complete plan. Define the setup, invalidation, maximum session risk, correlated exposure, and review method before an order is placed.