Account value
Total account equity used as the risk base.
Required · Unit: currencyPosition Size Calculator
Size a position from account risk, entry, stop and costs. Results are deterministic educational calculations—not financial, tax, legal or investment advice.
Calculate instantly
Result
Prepares a Chat draft with these inputs and this result. Nothing is shared with QELLY until you choose Send.
Worked example
The calculator opens with this registered example. Replace one assumption at a time to see how the deterministic result changes.
Example inputs
{
"accountValue": 100000,
"riskPercent": 1,
"entry": 100,
"stop": 95,
"multiplier": 1,
"estimatedFees": 10,
"slippagePerUnit": 0.05,
"quantityStep": 1,
"roundingMode": "floor"
}Example output
{
"riskAmount": 1000,
"riskPerUnit": 5.05,
"rawUnits": 196.039603960396,
"units": 196,
"estimatedFees": 10,
"totalRisk": 999.8
}Input glossary
Required inputs for this method: Account value, Risk percentage, Entry price, Stop-loss price, Contract multiplier. Validation boundaries below come from the registered calculator schema.
Risk percentage
Maximum account percentage allocated to this calculation.
Required · Unit: % · Minimum: 0 · Maximum: 100Entry price
Planned entry price.
RequiredStop-loss price
Price at which the risk assumption ends.
RequiredContract multiplier
Value represented by one unit or contract.
RequiredEstimated fees
Estimated fixed fees included in the risk budget.
Optional · Unit: currencySlippage per unit
Expected adverse price movement per unit.
OptionalQuantity step
Smallest tradable quantity increment.
Optional · Unit: unitsRounding Mode
Enter rounding mode for this calculation.
Optional · Allowed: floor, nearest, ceilAssumptions and limits
- Method: Position Size · version 1.0.0 · formula ID position-size.
- The calculation uses only the values entered on this page; it does not silently fetch live market data.
- Fees, taxes, liquidity, slippage and other costs are included only when the registered inputs explicitly model them.
- Display locale and rounding can change presentation, not the underlying deterministic receipt.
Edge cases
- Inputs outside registered validation rules return an error rather than a fabricated result.
- Array, matrix or cash-flow fields must be valid JSON in the structure described by their input label.
- Extreme assumptions can be mathematically valid but economically unrealistic; use them as sensitivity tests rather than forecasts.
Frequently asked questions
Does this calculator require an account?
No. It works publicly without login. Calculations run locally. Explain result prepares a local Chat draft; your inputs and result are shared with QELLY only if you choose Send.
Is the result a recommendation?
No. It is a deterministic formula receipt whose usefulness depends on the assumptions you enter.
Why can market outcomes differ?
Fees, taxes, liquidity, volatility, timing and future returns may differ from the model assumptions.
Can I share my inputs?
Yes. Share creates an optional URL fragment containing only the inputs you choose to share. The fragment is not sent to QELLY by the calculator page.