> Browser-side calculators for trailing drawdown, consistency rules and maximum drawdown — with the working shown and nothing uploaded anywhere. - Canonical: https://hadalinstruments.com/tools/ --- Tools # Calculators. Sixteen calculators for the arithmetic that decides prop-firm evaluations. Each shows its working, states what it does not know, and computes entirely in your browser — nothing you type is uploaded, stored or seen by anyone, including me. ## [Position size calculator](https://hadalinstruments.com/tools/position-size-calculator/) The published sizing formula allocates your stake and then lets the round trip overspend it: a stopped trade loses the stated risk plus the spread and commission, every time. This sizes against the loss that actually lands, prints the textbook figure beside it, and shows the gap. Lots and units, costs included - The textbook figure and its oversize - Value of one pip at your size - Round trip as a share of the stake ## [Trailing drawdown calculator](https://hadalinstruments.com/tools/trailing-drawdown-calculator/) A trailing floor ratchets up behind every new high and never comes back down. This computes where yours sits, how much room is left, and — because you trade lots rather than account currency — what that room is worth in pips at the size you are actually carrying. Floor and room - Room in pips at your lot size - Round-trip cost, ECN or standard - Indicative margin ## [Consistency rule calculator](https://hadalinstruments.com/tools/consistency-rule-calculator/) Published consistency rules disagree about what the percentage is a percentage of. This computes your best day against all three conventions at once and reports the spread, because a tool that silently picks one can tell you that you comply when your rule document says otherwise. Three denominators at once - The spread between them - Largest compliant day, in pips - What more profit would fix ## [Which drawdown rule do you have?](https://hadalinstruments.com/tools/trailing-vs-static-drawdown/) Static and trailing are not two rules but five, and the phrase in your agreement does not say which one you have. Answer four questions about the rule text and this classifies it — or, where the text does not settle it, computes the floor under every reading still possible and shows you the gap. Five architectures, filtered - Floor under each reading - The spread you are carrying - Which sentence would settle it ## [Risk of ruin calculator](https://hadalinstruments.com/tools/risk-of-ruin-calculator/) The probability that a run of losses takes an account past a level it cannot return from. Every calculator that ranks for this treats your win rate as if it were the truth, so forty trades and four thousand get the same answer. This asks how many trades yours came from and reports the range that sample actually supports. Ruin across your sample’s range - Expectancy per trade - Losses in a row that end it - Median worst decline ## [Kelly criterion calculator](https://hadalinstruments.com/tools/kelly-criterion-calculator/) The growth-optimal stake from a win rate and payoff — and because a win rate is an estimate from however many trades you actually took, the stake across the range your sample supports. When the pessimistic end of that range says zero, this says zero. Full Kelly, half and quarter - The range your sample supports - Expectancy per trade - Zero, when the sample cannot exclude it ## [Maximum drawdown calculator](https://hadalinstruments.com/tools/maximum-drawdown-calculator/) Paste an equity curve and get the deepest decline from a running peak — plus the duration almost nobody reports, because capital and patience expire on the clock rather than on the percentage. Depth, and the peak it fell from - Time under water - Whether it ever recovered - Depth in pips at your size ## [Margin and stop-out calculator](https://hadalinstruments.com/tools/margin-and-stop-out-calculator/) A position size is a multiplier, and it applies to survival as much as to profit. This computes how far price can travel before the broker closes you, what one pip is worth at the size you are carrying, and — the row no other margin calculator has — what a deposit actually buys in room. The price that closes you - Room left, net of getting out - Exposure, margin level and pip value - Round trip: spread or commission - What a deposit buys ## [Pip value calculator](https://hadalinstruments.com/tools/pip-value-calculator/) The value of one pip is three conventions multiplied together — what a pip is on this instrument, what a lot is at this broker, and which currency the product lands in — and every pip table hides all three. This states them, lets you overwrite each, and prices your spread at your size in the same breath. One pip per lot, and at your size - The conventions, stated and editable - Quote-currency honesty, rate yours - The spread in money per round trip ## [Forex profit calculator](https://hadalinstruments.com/tools/forex-profit-calculator/) Exit minus entry times size is the figure every profit calculator prints, and no closed trade ever paid it: the spread was crossed and the commission charged, both ways, out of the same account. This reports net as the headline, gross beside it labelled as what it is, and the share the costs took. Net result, costs included - Gross — the other calculators’ figure - The move in pips - Costs as a share of the move ## [Forex compounding calculator](https://hadalinstruments.com/tools/forex-compounding-calculator/) Compounding arithmetic is real; the fixed per-period return it runs on is the fiction, and the smooth curve is not even the right average — returns that swing compound to less than the same mean delivered smoothly. This computes the projection, labels it as your assumption, and prices the swing. The smooth curve, labelled honestly - Volatility drag, priced - No preset return — the blank is the point - Growth as arithmetic, never forecast ## [Risk reward calculator](https://hadalinstruments.com/tools/risk-reward-calculator/) The ratio is division; the number it exists to produce is the break-even win rate — the hit rate below which a strategy at this ratio loses money. This computes both, then both again with the round trip included, because costs shave every win and pad every loss, always in the unforgiving direction. R:R, chart distances and net of costs - Break-even win rate under each - What costs demand of your hit rate - Refusal when the trip eats the target ## [Sharpe ratio calculator](https://hadalinstruments.com/tools/sharpe-ratio-calculator/) A Sharpe ratio is an estimate with error bars that every ranking calculator omits. Paste your per-period returns and this computes the ratio, annualises under a convention it names, prints the interval your sample supports — and refuses below twelve periods, because noise deserves a refusal, not a decimal. Annualised Sharpe, convention stated - The 95% interval your sample supports - Mean, deviation and sample size - Refusal below the sample floor ## [Prop evaluation survivor](https://hadalinstruments.com/tools/prop-evaluation-survivor/) An evaluation has two exits: the target, and the rules that end the account first. From your own win rate, payoff and stake, and the rules typed from your own rulebook, this simulates the account trade by trade and reports how often it passes, how often it breaches, and which rule did the breaching — across the range your sample supports. Pass, breach or expiry, across your sample’s range - Which rule bound on the breached paths - Losses in a row that breach the floor - Median trades to a decision ## [Sample-size check](https://hadalinstruments.com/tools/sample-size-check/) There is no universal number of trades that proves an edge: the figure scales with the square of your edge’s dispersion-to-size ratio. This computes yours — the luck horizon — from your own log, puts the interval on the result that pays rather than on the win rate, and refuses below the floor. Luck horizon, in trades - Your record against it - Mean R and the interval it supports - A refusal below twelve results ## [Forex session clock](https://hadalinstruments.com/tools/forex-session-clock/) Session tables disagree because they hide two decisions: whose wall clock the boundaries live in, and what happens when the clocks change. This one states both — every window is New York wall-clock, daylight saving is handled once by the tz database, and every boundary is editable because the published conventions genuinely differ. Market open or closed, and how long until - Four sessions, live, in two clocks - Editable boundaries, convention stated - Killzones as labels, not promises ## Why the working is shown A number with no derivation is a number you cannot check, and every one of these tools is computing something a rule document also computes — where the two disagree, you need to see which step diverged. So each panel prints the arithmetic underneath the answer in the order it was performed. The method is short enough in every case to redo on paper, and each page states it in full for readers without JavaScript. They also state their limits. None of them knows your rulebook and none predicts anything. One of them does compute a probability — the [risk of ruin](https://hadalinstruments.com/glossary/risk-of-ruin/) calculator — and it can only do so because *you* supply the edge it runs on, from your own measured record. An edge estimate supplied by this site would be invented rather than measured, which is why that page asks how many trades yours came from and reports a range rather than a figure. Where a preset appears it is labelled typical and left editable, because pip values, spreads and contract sizes vary by broker and this site does not assert one broker's convention as a fact about your account. The terms these tools compute on are defined in the [glossary](https://hadalinstruments.com/glossary/). Where an evaluation has already ended and you want the arithmetic behind the breach reconstructed from your own account record, that is [Prop-Breach Forensics](https://hadalinstruments.com/assays/#prop-breach-forensics); the instrument that computes the same distances live, on every fill, is the [Prop-Evaluee Risk Guardian](https://hadalinstruments.com/instruments/prop-evaluee-risk-guardian/).