Free Trading Calculator

ATR Position Size Calculator

Calculate the number of shares that fits your risk based on your dollar risk, ATR, and selected ATR stop multiple. Free to use. No account required.

Plan your trades.
Manage risk.
Trade with confidence.

Position Size Calculator

Size the Trade Before You Take It.

Enter your own numbers below and get an instant position-size calculation based on the risk parameters you choose.

How It Works

Risk First. Share Size Second.

Position sizing starts with the amount you are willing to lose if your stop is reached. NMFR divides that dollar-risk amount by the ATR-based stop distance to calculate the maximum whole-share position that fits within the risk amount you entered.

  1. Choose your maximum dollar risk
  2. Enter your ATR
  3. Choose your ATR stop multiple
  4. NMFR calculates the stop distance
  5. NMFR divides your risk by the risk per share
  6. Share size is rounded down to the nearest whole share

Example Calculation

$300 Risk With a 1.5× ATR Stop

Here is an example using sample values.

Current Stock Price
$142.36
Account Size
$50,000
Risk Per Trade
$300
ATR (14)
$2.10
ATR Multiple
1.5×
Stop Distance
$3.15
Recommended Position Size
95 Shares
Maximum Planned Loss
$299.25
Position Value
$13,524.20
Account Risk
0.60%

Your Risk. Your Rules.

A Calculator, Not a Trade Signal.

This calculator performs math using the values you enter. It does not determine whether a trade is appropriate, recommend a stop methodology, or tell you what to buy or sell.

  • You choose the risk amount
  • You choose the ATR multiple
  • You choose the trade
  • NMFR performs the calculation

Planning your whole session? Try the Daily Loss & Drawdown Calculator, or explore Sidecar to keep your numbers beside your chart.

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  • Free calculators for all traders
  • Fast and easy to use
  • Use your own numbers and rules
  • No account required to calculate