Start with the number you need.
Five focused calculators for questions that become rows in an investment ledger. No account. Calculations run in your browser and inputs stay in the page address.
Stock calculator
Σ(qp) ÷ ΣqAverage cost calculator
Enter every purchase and see the average price you actually paid.
Open calculatorPosition calculatorc₁ = Σ(qp) ÷ ΣqAveraging down calculator
See the new average after another purchase, or the quantity needed for a target average.
Open calculatorContribution calculatorFV(m, n, i)Recurring investment calculator
Test a monthly contribution and your own return assumption over a fixed period.
Open calculatorIncome calculatorq × d × kDividend calculator
Turn one dividend payment into an annual gross amount, withholding estimate, and yield.
Open calculatorGoal calculatorm(T, n, i)Target amount calculator
Work backwards from a target to the monthly contribution required under your assumption.
Open calculatorA calculation is a snapshot. A ledger keeps the changes.
Portle keeps purchases, sales, dividends, fees, and deposits together, then recalculates from the records you own.
