How do I calculate my average cost per share?

Divide the total amount spent by the total number of shares. Add up (shares x price) for every purchase, then divide by the sum of the shares — not by the number of purchases.

What is averaging down?

Buying more of a holding at a lower price than you paid, which reduces your blended cost per share. It lowers your break-even price but also increases the amount committed to a position that has fallen.

Does my broker calculate this the same way?

Brokers generally report an average cost, but tax reporting may use specific-lot identification instead, which can produce a different gain or loss. Your broker’s records are the ones that count at tax time.

Calculadora de precio medio de acciones

Combina todas las compras de una misma acción en un coste medio por acción y consulta la ganancia o pérdida no realizada a cualquier precio actual.

AccionesPrecio por acción

Coste medio por acción: $132.00
Acciones totales: 25
Coste total: $3,300.00

Precio actual (opcional)$

Cómo se calcula

average cost = sum(shares x price) / sum(shares)

shares x price: the amount spent on one purchase
sum(shares): every share held, not the number of purchases

Ejemplo resuelto

Buying 10 shares at $150 ($1,500) and 15 at $120 ($1,800) is $3,300 across 25 shares, so the average cost is $132.00 — not $135.00, which is what averaging the two prices would wrongly give.

Preguntas frecuentes

How do I calculate my average cost per share?: Divide the total amount spent by the total number of shares. Add up (shares x price) for every purchase, then divide by the sum of the shares — not by the number of purchases.
What is averaging down?: Buying more of a holding at a lower price than you paid, which reduces your blended cost per share. It lowers your break-even price but also increases the amount committed to a position that has fallen.
Does my broker calculate this the same way?: Brokers generally report an average cost, but tax reporting may use specific-lot identification instead, which can produce a different gain or loss. Your broker’s records are the ones that count at tax time.

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