Average cost basis calculator

Blended price across two buys.

Built and reviewed by Dovanic, Founder and editor, FreeByteLast reviewed: 2026-08-18

Shares bought first

Price paid

Shares bought later

Second price

Average cost

$37.88

Total shares

160

With these inputs, average cost comes to $37.88. Total shares works out to 160.

What moves the number · Average cost

Input	−10%	Now	+10%
Shares bought first	$37.6	$37.88	$38.12
Price paid	$35.25	$37.88	$40.5
Shares bought later	$38.14	$37.88	$37.63
Second price	$36.71	$37.88	$39.04

Whatmakesequal

Save this set of inputs, change something, then save again to compare the outcomes side by side.

Blended price across two buys.

With the defaults above, average cost works out at $37.88.