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How is the Dow divisor calculated?
Have you actually read the Wikipedia article? To calculate the DJIA, the sum of the prices of all 30 stocks is divided by a divisor, the Dow Divisor. The divisor is adjusted in case of stock splits, spinoffs or similar structural changes, to ensure that such events do not in themselves alter the numerical value of the DJIA. Early on, the initial divisor was composed of the original number of component companies; which made the DJIA at first, a simple arithmetic average. The present divisor, after many adjustments, is less than one (meaning the index is larger than the sum of the prices of the components). That is: DJIA = sum(p) / d where p are the prices of the component stocks and d is the Dow Divisor. Events such as stock splits or changes in the list of the companies composing the index alter the sum of the component prices. In these cases, in order to avoid discontinuity in the index, the Dow Divisor is updated so that the quotations right before and after the event coincide: DJIA = sum(p_old) / d_old = sum(p_new) / d_new The Dow Divisor was 0.14602128057775 on December 24, 2015.[40] Presently, every $1 change in price in a particular stock within the average, equates to a 6.848 (or 1 ÷ 0.14602128057775) point movement. Knowing the old prices, new prices (e.g. following a split), and old divisor, you can easily compute the new divisor... Edit: Also, the detailed methodology is published by SP Indices (PDF). Edit #2: For simplicity's sake, assume the DJIA is an index that contains 4 stocks, with a price of $100.00 each. One of the stocks splits 2:1, meaning the new price/share is $50.00. Plugging the numbers into the above equation, we can determine the new Dow Divisor: 400 / 4 = 350 / d => d = 3.5