Three checkpoints in this guide
Follow the full walkthrough in order, or jump directly to one of its main sections.
Quick answer: Trader's Second Brain currently publishes 22 free browser-based trading tools. Start with Position Size before an order, Risk/Reward before accepting a target, and Drawdown when setting an account-level risk limit. The remaining calculators solve narrower forex, crypto, performance, technical-level, and review tasks.
No account signup is required to open the tools. Most core calculations run from the values entered on the page. Two access details matter: the Trading Psychology Quiz lets you skip the optional email step and view the result, while the downloadable PDF in the 30-Day Trading Audit requires an email. The Funding Rate Tracker loads current data from a TSB endpoint, so it is not an offline calculator.
Ownership disclosure: the calculators and Trader's Second Brain are our products. This guide explains which tool fits which job and documents limitations that the tool page or your broker/exchange still controls. A calculator result is not a signal, a guarantee, or a substitute for the exact instrument and account specification.
Which Free Trading Calculator Should You Use?
| Your question | Start here | Check before acting |
|---|---|---|
| How large should this forex trade be? | Position Size Calculator | Account currency, pair, stop distance, pip value, and broker lot step |
| What is the planned reward relative to risk? | Risk/Reward Calculator | Fees, slippage, partial exits, and actual fill prices |
| How much recovery is needed after a loss? | Drawdown Calculator | Whether drawdown is measured from balance, equity, day start, or peak |
| What fee may this crypto order incur? | Exchange Fee Comparison | Signed-in tier, exact product, maker/taker outcome, region, and order preview |
| Where is a leveraged crypto position liquidated? | Liquidation Calculator | Venue formula, maintenance tier, margin mode, other positions, and fees |
| Would these average stats survive a challenge model? | Prop Firm Calculator | Treat the generated sequence as a rough scenario, then verify the exact live program |
If a calculator changes position size, margin, liquidation distance, or an account-rule decision, compare its output with the broker, exchange, or firm interface before placing the order. Use the position-size calculation guide when you need the formula and units rather than only the result.
All 22 Free Trading Tools, by Job
The count below comes from the server-side tool catalog checked on September 9, 2026. The title remains an editorial field, so a future catalog addition requires a reviewed title and copy update; the article does not silently claim a larger number.
Risk management: 5 tools
| Tool | What it returns | Important boundary |
|---|---|---|
| Position Size Calculator | Forex lot size from balance, chosen risk, stop distance, and pair inputs | Round down to the broker's valid lot step and verify account-currency conversion |
| Lot Size Calculator | Risk amount, pip value, and standard-lot estimate for a forex setup | Contract size and quote conversion are instrument-specific |
| Risk/Reward Calculator | Planned risk, planned reward, R multiple, and gross break-even win rate | A target is not an achieved fill; costs raise the true break-even rate |
| Margin Calculator | Required-margin estimate from position, leverage, and price inputs | Broker contract rules, currency conversion, and portfolio offsets may differ |
| Kelly Criterion Calculator | A Kelly fraction from estimated win probability and win/loss payoff | Small errors in the assumed edge can produce an aggressive, unstable fraction |
For forex, the lot-size guide explains why pip value and account currency must be resolved before the lot output is meaningful.
Technical and break-even math: 3 tools
| Tool | What it returns | Important boundary |
|---|---|---|
| Fibonacci Calculator | Retracement and extension prices from a chosen high and low | The arithmetic is deterministic; the selected swing and trading interpretation are not |
| Pivot Point Calculator | Standard, Fibonacci, Camarilla, Woodie, or DeMark level sets | Method, session close, and input period must match the chart workflow |
| Break-Even Calculator | Gross break-even win rate, price break-even, or recovery-trade estimate by selected tab | Use the fee input where offered and reconcile actual costs separately |
Forex currency and pip math: 2 tools
| Tool | What it returns | Important boundary |
|---|---|---|
| Pip Calculator | Pip value for the selected pair, size, and account inputs | Confirm whether the platform labels a pip or fractional pip and how cross-currency conversion is handled |
| Currency Converter | An educational conversion from the page's approximate rate table | It is not an executable quote; use the broker's current rate for a live decision |
Profit, cost, and account path: 5 tools
| Tool | What it returns | Important boundary |
|---|---|---|
| Stock Average Calculator | Weighted average price, total quantity, and invested amount across purchases | Tax lots, sale matching, currency conversion, and corporate actions are outside simple averaging |
| Forex Profit Calculator | Estimated forex P&L from pair, side, size, and entry/exit inputs | Add spread, commissions, swaps, and conversion actually charged |
| Crypto Profit Calculator | Profit and return estimate with entered trading-fee assumptions | Funding, borrow, transfers, slippage, and taxes are separate unless explicitly entered |
| Compound Calculator | A projection from starting value, assumed periodic return, additions, and horizon | A smooth rate is a scenario, not a forecast of volatile trading returns |
| Drawdown Calculator | Loss percentage, remaining value, and percentage gain required to recover | It does not model the path, probability, or account-specific breach definition |
Crypto and exchange tools: 3 tools
| Tool | What it returns | Important boundary |
|---|---|---|
| Liquidation Calculator | An estimated long or short liquidation price from entered leverage and margin assumptions | The venue's exact maintenance tiers, margin mode, other positions, and liquidation fees control |
| Exchange Fee Comparison | Estimated maker or taker charge for the selected market and order value | The page uses an embedded public-rate snapshot; confirm the signed-in rate and order preview |
| Funding Rate Tracker | A cross-venue table loaded from the current TSB funding-rate endpoint | Rate, interval, symbol, and next settlement can change; confirm the exact contract |
Challenge and review tools: 4 tools
| Tool | What it returns | Important boundary |
|---|---|---|
| Prop Firm Calculator | Generated trade-sequence scenarios from average stats and a simplified built-in rule model | It is not a pass probability or the authority for a live program |
| Trading Psychology Quiz | A rules-based profile from seven answers, with an option to skip email | It is a reflection prompt, not a clinical or predictive assessment |
| Remove Worst Trades | A counterfactual comparison after excluding selected worst P&L rows from a CSV | Removing known losers creates hindsight bias; use it to inspect mistakes, not restate strategy expectancy |
| 30-Day Trading Audit | A downloadable review workbook generated in the browser after email submission | It is a manual framework, and the PDF download is the exception to the no-email claim |
How to Estimate Fees and Commissions Before a Trade
For a simple percentage fee, estimate each charged leg separately: order value × applicable fee rate. A round trip may have different entry and exit rates because maker/taker status depends on how each order actually executes. A limit order that crosses the book can be a taker; a resting order can remain unfilled.
The visible fee is only one cost. Add expected spread, slippage, funding or borrow, currency conversion, and withdrawal or transfer costs when they affect the decision. The Exchange Fee Comparison is a quick public-snapshot calculator, not canonical account truth. The final pre-trade check belongs in the signed-in order preview for the exact entity, region, product, pair, tier, and order.
Do not turn a snapshot into a winner claim. If the page's embedded fee row conflicts with the signed-in account, the account and official schedule control. Record the rate and date used in the calculation so a later review can explain the difference.
Four Formula Boundaries That Prevent Bad Outputs
1. Gross break-even is not net break-even
For an average win of R times the average loss, the gross break-even win rate is 1 ÷ (1 + R). Trading costs and execution shortfall move the required rate higher. Planned R also differs from realized R when exits are partial or discretionary.
2. Risk percentage is a choice, not a recommendation
A position calculator faithfully scales whatever risk input you choose. It cannot decide whether that input fits the strategy distribution, account rules, correlated positions, or personal loss tolerance. Use the risk-per-trade framework to connect sizing with drawdown capacity.
3. Liquidation formulas are venue-specific
A simplified calculation can illustrate leverage, but an exchange may use maintenance-margin tiers, cross collateral, unrealized P&L from other positions, insurance rules, and fees. Keep the intended stop materially separate from the estimated liquidation point and confirm the platform display.
4. A projection is not an expected outcome
Compound calculators repeat an assumed return smoothly. Real trading paths include losses, withdrawals, changing size, capacity limits, and strategy decay. Use a range of scenarios and show the assumptions beside the output.
What to Do When Two Calculators Disagree
Do not choose the answer you prefer or average the two outputs. Freeze the same inputs, then compare the definitions in order: instrument and contract type, account and quote currency, stop-distance unit, direction, fee treatment, margin mode, rate timestamp, and rounding increment. A pip-versus-fractional-pip mismatch can change a forex result by an order of magnitude; a percentage entered as a whole number instead of a decimal can do the same.
Next, reproduce one output with the formula shown on the page. If the formula is not visible, treat the result as less auditable. For live exchange, broker, or program values, compare the calculator's snapshot date with the signed-in interface. Two mathematically correct tools can disagree because one uses a newer fee tier, a different maintenance-margin bracket, or a different definition of drawdown.
Disagreement log
- Save both URLs, the calculation time, and every input.
- Record each tool's unit and formula, not only the final number.
- Identify which mutable value came from a snapshot or live endpoint.
- Use the execution platform's current specification as the operational authority.
- Round toward lower exposure when the venue's valid increment is coarser.
If the discrepancy cannot be explained, do not use either result to size a real order. An unexplained small difference can become a material risk error after leverage.
A Practical Calculator Workflow
- Before the session: define account balance, maximum planned loss, relevant program limits, and the products you are allowed to trade.
- Before the order: fix entry, stop, and invalidation first; then calculate size, planned R, margin, and any liquidation buffer.
- In the order preview: confirm valid quantity increments, buying power, fee tier, and the exact order type.
- After the fill: record actual quantity, prices, commissions, fees, funding, and rule state. Planned outputs are not realized results.
- During review: compare planned risk and cost with what occurred, then change one process rule at a time.
The broader risk-management guide connects these one-trade calculations to account-level exposure and losing-streak capacity.
Move From One-Off Calculations to Evidence
Free calculators answer a bounded question. They do not automatically prove that the executed trade followed the output. That is where a journal becomes useful: preserve planned risk, actual fills, costs, account scope, and the source behind each number.
Trader's Second Brain is our product. Its canonical registry currently recognizes 332 structured broker, exchange, platform, and prop-export profiles. That is a parser and mapping count, not a promise that every account or custom export will reconcile. Preview a representative source and match trade count, quantity, timestamps, fees, and net result before trusting the journal.
TSB can then compare planned versus realized risk and retain calculator context beside the trade record. Full Access includes review and prop-rule workflows and offers a lifetime-access route. Those are workflow advantages, not proof that the calculations create an edge or prevent a loss.
Useful handoff: calculate before the order, verify in the execution interface, then journal the actual result. The trade-journal field guide shows which inputs are worth preserving.
Final Checklist Before You Trust a Calculator
- Are the units, account currency, direction, and instrument type explicit?
- Does the tool's formula match the broker, exchange, or program definition?
- Are fees, spread, slippage, funding, and conversion included where material?
- Is the output rounded to an actually valid order increment?
- Can the calculation be reproduced from saved inputs?
- Did the final order preview confirm the number before execution?
Precision protects a process; it does not create a profitable strategy. Use the simplest calculator that answers the current question, preserve its assumptions, and compare the planned result with the executed trade.
Catalog and implementation checked against the local server-side tool registry and all 22 PHP tool routes on September 9, 2026. Production remained read-only.
