Averaging down guides

• How to Calculate Your Average Cost After Averaging DownThe weighted-average formula for your new cost per share after buying more, worked by hand in a table, plus how commissions change it.
• How Many Shares to Reach a Target Average CostSolve the average cost formula backwards to find the shares needed for a target average, and see when the target is impossible.
• Commissions, Taxes and Your Break-even PriceHow commissions and sell fees set your true break-even price, plus US capital gains tax, tax lots and the wash-sale rule when averaging down.
• The Risks of Averaging DownAveraging down lowers your cost per share but raises the money at risk. Losses if the price keeps falling, opportunity cost and concentration.
• Averaging Down Calculator FAQCommon questions: the average cost formula, why a target can be impossible, default fees, why capital gains tax is excluded, and your privacy.
• Does Selling Shares Change Your Average Cost?Worked numbers showing why a partial sale leaves average cost unchanged, how to find realized gain with fees, and how FIFO and specific lots differ.