Calculator
40.0000 units
$100.00 simulated risk if the stop is hit
Paper notional value$4,000.00
Example long stop level$97.50
Risk-to-equity check1.00%
Tool
Paper trading risk calculator
Plan simulated risk before a paper entry. Enter account equity, risk percent, stop distance, and paper entry price to calculate the planned paper size, simulated loss at the stop, and review notes you can copy into a journal.
What this tool does
The paper trading risk calculator turns a risk rule into a simulated size. The calculation is simple: account equity times risk percent gives the paper risk amount, and paper risk amount divided by stop distance gives planned paper size.
Use the output before the simulated order is recorded. A calculator used after the result is known is just a story about what should have happened. A calculator used before entry becomes a useful process check.
Trading Boy does not execute live trades, hold funds, or provide financial advice. Trading Boy is a paper-trading and review system, so every number on this page is for educational simulation and journal review.
Why paper risk needs its own calculator
Paper trading is most useful when the simulated environment is strict enough to reveal behavior. If every paper trade uses a different equity assumption, a different risk percent, or a loosely chosen stop, the journal starts measuring mood instead of process. A paper trading risk calculator helps make each simulated entry comparable with the last one.
The goal is not to make a paper trade feel more precise than it really is. Markets still gap, spreads move, liquidity changes, and a simulated fill cannot prove that a live fill would have existed. The goal is to separate the decision rule from the outcome. When the planned paper size is written down before the result, the review can ask a better question: did the trader follow the rule that was visible at the time?
| Input | What to enter | Review question |
|---|---|---|
| Simulated account equity | The paper account value used for the current test, such as 10000 or 25000. | Is this the same baseline used in the rest of the paper journal? |
| Risk percent | The percentage of simulated equity that can be lost if the paper stop is reached. | Was this chosen before the setup was judged, or adjusted to force the trade? |
| Stop distance | The difference between the paper entry price and the invalidation level. | Does the distance match the written invalidation, not an after-the-fact preference? |
| Paper entry price | The planned simulated entry used to estimate notional exposure and an example stop level. | Was the price available before the entry note was saved? |
| Planned paper size | The simulated units produced by the risk amount divided by stop distance. | Would the same rule produce the same size on the next similar paper setup? |
Example
Simulated account equity: $10,000
Risk rule: 1 percent of paper equity, or $100 of simulated risk
Paper entry and stop distance: Entry at $100 with a $2.50 stop distance gives a planned paper size of 40 units.
Planned result: If the paper stop is hit, the simulated loss is $100 before any modeled fees, spread, or slippage assumptions.
Journal note: The idea can be reviewed later because the risk, invalidation, and size were known before the outcome.
Workflow links
Use this page with the position size calculator when you need a stop-price version of the same idea. Compare the planned loss and target with the risk-reward calculator, then run a weekly exposure check with the max drawdown calculator.
For process controls, add the number to the trade entry checklist, review exceptions in the risk review workflow, and keep the broader practice plan anchored in the paper trading hub.
Paper-first safety rules
- Write the paper setup, invalidation, and stop distance before using the calculated size.
- Keep the same simulated account equity across a test period unless the journal documents the reset.
- Lower the risk percent when the goal is behavior testing, not simulated performance maximization.
- Skip the paper trade when the size only works after moving the stop closer than the setup allows.
- Review correlated paper exposure before adding a new simulated position in the same market narrative.
What the calculator cannot know
The calculator cannot tell whether a setup is good, whether the stop is placed well, or whether a live order would fill. It also does not account for exchange rules, margin, leverage, borrow costs, taxes, partial fills, or changing liquidity. Those gaps matter, which is why the page is built around paper-trading review instead of trade recommendations.
A strong paper process treats the calculated size as a constraint, not a prediction. The useful question is whether the simulated trade respected the rule. The answer belongs in a review record alongside screenshots, entry notes, risk notes, and the final outcome.
Use the result in a review loop
After the paper entry closes, compare the planned paper risk with the recorded behavior. If the simulated stop was moved wider without a rule, the size no longer represented the original risk. If the entry changed but the stop distance did not, the notional exposure may have drifted. If the trader skipped the calculated size and used a round number instead, the journal should flag that as a discipline miss.
The review should be practical. A paper loss inside the planned amount can be a good process result. A paper win that ignored the risk cap can be a bad process result. This is the difference between outcome review and risk review.
When to reduce or skip
There are times when the best calculator output is a decision not to enter. If the stop distance makes the planned size tiny, the setup may be too wide for the current rule. If the planned size creates too much paper notional exposure, the idea may need a smaller risk percent. If the invalidation is not clear, the trade does not have a risk boundary yet.
Skipping a paper trade is still useful data. It shows that the rule can prevent low-quality entries before they become review problems. That discipline is the point of using a paper trading risk calculator instead of improvising size from confidence.
Important limitation
This is an educational paper-trading calculator. It does not connect to brokerage accounts, place orders, custody assets, or recommend securities. For platform safety details, read the risk controls and review page and the paper trading limitations page.
FAQ
What does the paper trading risk calculator calculate?
The calculator estimates simulated risk amount, planned paper size, paper notional value, and a stop-hit result from account equity, risk percent, stop distance, and paper entry price.
Is this calculator for live trading?
No. Trading Boy does not execute live trades, hold funds, or provide financial advice. This calculator is for educational paper-trading review only.
Why use stop distance instead of a stop price?
Stop distance keeps the sizing rule focused on risk per unit. It lets you size paper ideas consistently whether the simulated setup is long, short, crypto, equity, or another instrument.
How should I record the result in a journal?
Record the account equity, risk percent, stop distance, entry price, planned paper size, and the reason the risk was accepted before the simulated trade outcome is known.