Aktiendurchschnittsrechner (Average-Down Calculator) - kostenlos
Work out your new average cost per share after buying more, in seconds - free, no signup, with formula and example. Auch als deutscher Aktiendurchschnittsrechner nutzbar.
Also available in German: Aktiendurchschnittsrechner - neuer Durchschnittskurs →
Inputs
Share price
Also called: Stock price, market price
Where to find it: Any finance site (Google/Yahoo Finance) — the current trading price per share.
How to derive: Set by the market; just enter the current price per share.
Share price
Also called: Stock price, market price
Where to find it: Any finance site (Google/Yahoo Finance) — the current trading price per share.
How to derive: Set by the market; just enter the current price per share.
Result, live
Averaging down lowers your cost - but only makes sense if the thesis is intact. Check fair value first, average second.
The average-down calculator shows your new average cost per share after buying more. It weights your old and new purchase by number of shares, so you instantly know the price at which you break even again.
How the formula works
Your new average cost is total money invested divided by total shares – a share-weighted average, not the simple midpoint of the two prices.
Example: 100 shares at $50 plus 50 shares at $35 gives 150 shares for $6,750. Your new average cost drops to $45.00, down from $50.
How to read the result
- New average cost – your break-even: above this price you're back in profit.
- Total shares – how many shares you now hold in total.
- Total invested – the capital tied up in this position.
- The new average always sits between your old and new purchase price.
What to watch out for
- A lower cost is not a profit yet – the price still has to climb back above your new average.
- Buying more raises concentration risk: more money in a single stock. Fees and spread are not included.
- Check the investment thesis still holds first – 'cheaper' doesn't automatically mean 'good'.