Trade smarter.
Risk better.
Learn trading concepts, understand the numbers, and calculate your risk before you place a trade.
- Terms explained
- 135
- Live mini-tools
- 14
- Sign-up required
- None
- Max Risk
- $100
- Position Size
- 50shares
- Risk / Reward
- 1 : 3
Risking $100 with a $2 stop means 50 shares — and +$300 if your target is reached.
Open this trade in the full calculatorChange any value above — every number updates instantly. This is the same math the full calculator runs.
Understand the trade before you take the trade
A number without an explanation is just trivia. Every calculation here connects back to the idea behind it, and every idea connects forward to a tool.
- 01
Learn
Start with a concept
Every term is explained in plain language, with a diagram where a diagram actually helps.
- 02
Understand
Change the numbers
Most terms carry a live mini-tool. Move a stop, watch the position size respond immediately.
- 03
Calculate
Size your own trade
Take it into the full calculator, prefilled, and see the arithmetic worked out step by step.
- 04
Explore
Follow the thread
Every result links back to the idea behind it, and every idea links on to the next one.
Three tools, one calculation
They share the same engine. Start wherever your question starts.
Risk Calculator
The complete picture: position size, exposure, profit, loss and risk/reward.
$10,000 · 1% · $50 → $48
50 shares
Position Size Calculator
One question, answered fast: how many shares should this trade be?
Risk $100 with a $2 stop
50 shares
Risk/Reward Calculator
Compare the upside to the downside, and see the win rate it demands.
Risk $2 to make $6
1 : 3 · 25% to break even
Read the whole idea, not just the definition
Longer, worked-through pieces that connect several concepts at once — with a live calculator built into each one.
How to Calculate Position Size: A Complete Guide
Position size is not a guess or a round number — it falls out of two decisions you have already made. Here is exactly how to get from those decisions to a number of shares.
Read the guideRisk/Reward Ratio Explained: What It Actually Means for Your Results
A risk/reward ratio is not a score for how good a trade looks. It is a specific, calculable claim about how often you need to be right — and most traders never check whether their win rate actually clears it.
Read the guideStop Loss Placement: A Practical Guide
Where you put your stop decides your position size, your risk, and often whether the trade even makes sense. Most guides skip straight to money. This one starts with the chart, where the answer actually lives.
Read the guideThe language of the market, decoded
135 terms across 11 categories. Each one gets a real explanation, the mistakes people actually make, and a path to the next concept.
Concepts you can change and watch move
Most looked up
- AskThe lowest price a seller is currently willing to accept for an asset.
- ATRThe average size of an instrument’s price range per period, including gaps.
- BidThe highest price a buyer is currently willing to pay for an asset.
- BreakoutWhen price moves decisively beyond an established support or resistance level.
- Call OptionA contract giving the right, but not the obligation, to buy an asset at a set price before expiration.
- DeltaHow much an option’s price moves for a $1 move in the underlying.
- DrawdownThe decline from an account’s peak value to its lowest point before a new peak.
- Earnings ReportA company’s scheduled quarterly disclosure of financial results.
Think you have it? Check.
Short questions on the concepts that decide real outcomes — what happens to position size when a stop widens, what win rate a 1:3 trade actually needs. Every answer comes with the reasoning, right or wrong.