Complete guide
Dollar-Cost Averaging Calculator: formula, example and decision guide
Calculate units accumulated and average cost from a list of periodic purchase prices. The result updates instantly and keeps every assumption visible.
What the Dollar-Cost Averaging Calculator measures
Calculate units accumulated and average cost from a list of periodic purchase prices.
Use the result to compare scenarios built from the same definitions and time period.
Formula and variables
The calculator applies units per purchase = (periodic amount − fee) ÷ purchase price; average cost = total invested ÷ total units. Each variable is entered in a labeled field and remains visible beside the answer.
units per purchase = (periodic amount − fee) ÷ purchase price; average cost = total invested ÷ total unitsWorked example
Four equal $250 purchases at different prices accumulate more units when prices are lower.
Change one input at a time to see which assumption has the greatest effect on the result.
How to interpret the result
Read the main result together with the detailed rows; the headline number alone does not describe every cost, unit or assumption.
Save comparable scenarios with the copy, link, CSV or PDF controls.
Assumptions and limitations
This historical arithmetic does not predict prices, taxes, spreads, custody risk or investment suitability.
Real contracts, measurements, platform rules and professional standards can add inputs that this general-purpose model does not infer.
Accuracy checklist
Confirm units, time periods, fees and source figures before relying on the output.
Round the displayed answer only after the calculation; intermediate values retain full precision.
Calculation audit
| Item | What to review |
|---|---|
| Inputs | Purchase prices, separated by commas, Amount invested each purchase, Fee per purchase, Current asset price |
| Equation | units per purchase = (periodic amount − fee) ÷ purchase price; average cost = total invested ÷ total units |
| Example | Four equal $250 purchases at different prices accumulate more units when prices are lower. |
| Limit | This historical arithmetic does not predict prices, taxes, spreads, custody risk or investment suitability. |
Frequently asked questions
What does this Dollar-Cost Averaging Calculator calculate?
Calculate units accumulated and average cost from a list of periodic purchase prices.
Which formula does it use?
units per purchase = (periodic amount − fee) ÷ purchase price; average cost = total invested ÷ total units
Does it calculate while I type?
Yes. Valid changes update the result automatically without reloading the page.
Which inputs should I verify?
Verify every unit, period, rate and fee against the source you are modeling.
Is the result exact?
This historical arithmetic does not predict prices, taxes, spreads, custody risk or investment suitability.
Can I save or share the result?
Yes. Copy, native sharing, WhatsApp, PDF/Print, CSV, comparison and parameterized links are available.
What to keep in mind
This historical arithmetic does not predict prices, taxes, spreads, custody risk or investment suitability.
Results display up to 8 decimal places; exported numbers preserve calculation precision. This is a calculation summary, not an official certificate.