Calculate. Plan. Invest.
Make clearer investment decisions with numbers you can verify.
Free calculators for recurring investing, cost basis, position sizing, and stop-loss planning—built to show the formula, the assumptions, and the limits.
Live method preview
Risk has a number before a trade has a size.
- Account size
- $10,000
- Risk limit
- 1.00%
- Entry → stop
- $50.00 → $47.50
$100 risk budget ÷ $2.50 risk per share
Choose your goal
Start with the question, not the tool.
- 01
- 02
Understand your cost basis
Combine purchase history and find the break-even price.
Open Average Cost Calculator → - 03
- 04
Review portfolio allocation
Planned for a later release after the P0 tools are validated.
Why BasisPilot
Four standards behind every result.
Transparent formulas
See the general formula and your numbers substituted into it.
Real-world assumptions
Account for fees, slippage, inflation, and whole-share rounding.
Private by default
No account. Calculations run locally and inputs are not sent to analytics.
Clear limitations
Understand which assumption or constraint controls the result.
Published methodology
Reproducible by design.
Versioned formulas, conservative rounding, visible assumptions, and automated fixed-example checks.
Read our methodology- Formula version
- 1.0
- Precision
- 32 digits
- Reviewed
- Aug 5, 2026
P0 calculator set
Every calculator currently available.
01DCA Calculator
Project recurring contributions and separate invested cash from estimated growth.
Average Cost Calculator
Combine purchase history or plan a new buy and see the break-even price.
Position Size Calculator
Turn an account risk limit and stop price into a position size.
Stop-Loss Calculator
Convert a percentage, ATR multiple, or risk budget into a stop price.