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26 calculators

Trading Tools & Calculators

Plan a trade before you place it.

Every tool states the formula it uses and the assumptions behind it, so the number can be checked rather than trusted. Size the position first, then work outwards to cost, reward and long-run performance.

Find a tool
26 of 26 shown · formula on every page

Risk & position sizing

5 of 5

Trade calculators

4 of 4

Account & costs

4 of 4

Performance

7 of 7

Market analysis

6 of 6

Keep every calculation you run.

A free account saves your trade plans, your instrument defaults and your performance statistics, and opens the quant curriculum.

The chain these fit into

A calculator answers one question and immediately raises the next. Taken in order they describe a single trade end to end, and most of the mistakes people make with them come from taking one out of that order.

From account to consequence
StageWhat it decides
Account → riskHow much one loss costs, in dollars, before you look at a chart
Risk → position sizeThe size that makes the stop cost exactly that. Size is an output, never an input
Position size → margin and leverageWhat the broker holds, and what your actual exposure is
Trade → costsSpread, commission and swap, all paid whichever way the trade goes
Results → expectancyWhether the strategy earns anything, once win rate and payoff are combined
Expectancy → drawdown and ruinWhat a bad run does, and whether the account survives it

Every page shows its formula

Each calculator states the equation it uses, works an example through it with the page’s own default inputs, and lists what it assumes. That is there so the result can be checked by hand — a number you cannot reproduce is a number you are trusting rather than using.

Where this goes wrong

Margin is not risk. A position can sit comfortably inside your margin and far outside your risk budget, and confusing the two is the most common way an account becomes over-leveraged without anyone noticing.

The inputs people get wrong

Four mistakes account for most of the wrong answers these calculators produce, and none of them is a fault in the arithmetic.

  1. Pip value on a cross. A pip is $10 per standard lot on USD-quoted pairs only. On a JPY-quoted pair it depends on the rate, and if your account is in a third currency it needs converting again. Skipping that overstates a position by half on some pairs.
  2. Margin taken for risk. Margin is what the broker holds; risk is what the stop costs. On one lot of EURUSD at 30:1 those are roughly $3,900 and $400 — different numbers about different things.
  3. Gross figures treated as net. Profit, expectancy and risk-reward are all quoted before costs unless you enter them. On a tight stop the spread is a material share of the trade, not a rounding error.
  4. Position size as an input. It is an output. Deciding the size first and fitting the stop to it puts the stop where the market has no reason to respect it.

Which calculator answers which question

The categories describe stages of one decision rather than separate topics.

If the question isStart at
How large should this position be[Position size](/position-size-calculator), then [stop loss](/tools/stop-loss-calculator) if the size is fixed
What will this trade cost me[Spread](/tools/spread-calculator), [commission](/tools/commission-calculator) and [swap](/tools/swap-calculator) if held overnight
Is this strategy actually profitable[Expectancy](/tools/expectancy-calculator), then [break-even](/tools/break-even-calculator) to see what the payoff demands
Can my account survive this[Drawdown](/tools/drawdown-calculator), [risk of ruin](/tools/risk-of-ruin-calculator) and [Kelly](/tools/kelly-criterion-calculator)
How volatile is this instrument[ATR](/tools/atr-calculator), [ADR](/tools/adr-calculator) and [volatility](/tools/volatility-calculator)

Every one of them shows the equation it evaluates and a worked example using its own defaults, so a result can be checked by hand before it is trusted.