Rex says
Money math without the spreadsheet headache. Plug in your numbers and I'll show you exactly where the dollars land.
Try a scenario
Click to load — tweak from there.Inputs
Result
Position size (units)
1.5000
Notional value
$4,800
Dollars at risk
$375
Reward : risk
2.80
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One click, a permanent link with your numbers baked in.
How to use this
- 1Enter account size ($).
- 2Enter risk per trade (%).
- 3Enter entry price ($).
- 4Enter stop-loss price ($).
- 5Enter target price ($).
- 6Read your position size (units) on the right — it updates as you type.
- 7Hit Share to keep the scenario or send it to someone.
About this calculator
Risk a fixed percentage of your account per trade. This turns your entry and stop into a position size that respects that rule.
Worked example
Using the values the calculator loads with:
Inputs
- Account size: 25000 $
- Risk per trade: 1.5 %
- Entry price: 3200 $
- Stop-loss price: 2950 $
- Target price: 3900 $
Results
- Position size (units): 1.5
- Notional value: $4,800
- Dollars at risk: $375
- Reward : risk: 2.8
What each field means
Inputs
- Account size ($)
- The account size used in the calculation, measured in $. Starts at 25000 $ so you have a working example on load.
- Risk per trade (%)
- The risk per trade used in the calculation, measured in %. Starts at 1.5 % so you have a working example on load.
- Entry price ($)
- The entry price used in the calculation, measured in $. Starts at 3200 $ so you have a working example on load.
- Stop-loss price ($)
- The stop-loss price used in the calculation, measured in $. Starts at 2950 $ so you have a working example on load.
- Target price ($)
- The target price used in the calculation, measured in $. Starts at 3900 $ so you have a working example on load.
Results
- Position size (units)
- Returned as a decimal number and shown as the headline result. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Notional value
- Returned as a money amount in US dollars. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Dollars at risk
- Returned as a money amount in US dollars. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Reward : risk
- Returned as a decimal number. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
FAQ
How does the crypto position size calculator work?
Risk a fixed percentage of your account per trade. This turns your entry and stop into a position size that respects that rule.
What do I need to enter?
5 values: account size, risk per trade, entry price, stop-loss price, and target price. Each field starts with a sensible default, so you can change one number at a time and watch the result move.
What does the position size (units) result mean?
It is returned as a decimal number and updates live as you edit the inputs, so you can compare two or three versions of a scenario in a few seconds.
Is this calculator free, and do I need an account?
Yes, it's free, and no account is required. Nothing you type is stored on our servers — the maths runs entirely in your browser.
How accurate is the result?
It applies the standard formula exactly, so the arithmetic is precise. Results are estimates before tax, fees, and inflation unless an input explicitly covers them.
Who is this tool for?
It's built for anyone comparing money scenarios before committing — budgeting a payment, sanity-checking a quote, or seeing what a change in rate or term actually costs.
Accuracy and limitations
- Results are estimates before tax, fees, and inflation unless an input explicitly covers them.
- Rates are treated as fixed for the whole period — variable-rate products will drift from this projection.
- This is educational maths, not financial advice. Check anything contractual with the lender or your accountant.
Related tools
Cite this calculator
Writing about this topic? Grab a citation — every link helps keep these tools free.
RevenueLab. (2026). Crypto Position Size Calculator. Retrieved from https://www.revenuelab.fyi/toolbox/crypto-position-size
<p>Source: <a href="https://www.revenuelab.fyi/toolbox/crypto-position-size" target="_blank" rel="noopener">Crypto Position Size Calculator — RevenueLab</a> (2026).</p>
Source: [Crypto Position Size Calculator — RevenueLab](https://www.revenuelab.fyi/toolbox/crypto-position-size) (2026).