What a stock split does
A stock split changes your share count and price. It does not change what your holding is worth. You enter your shares held. You enter the split ratio. You also enter the price per share. The tool shows your new share count.
Why companies split stock
A high price can scare off small buyers. A split lowers the price per share. That can make the stock easier to trade. It also signals confidence to the market. The total value, though, stays the same. A split changes form, not worth.
How to use this calculator
Enter three values. Put in your shares held now. Then enter the split ratio, like three for one. Add the current price per share. The tool shows the new share count and price. Change any input and it recomputes.
How it is calculated
The math is direct. New shares = shares × ratio. Your count grows by the ratio. The price falls by the same ratio. So the value of the holding holds steady. More shares balance the lower price exactly.
A worked example
Say you hold one hundred shares at one hundred fifty each. The split ratio is three for one. Your new count is three hundred shares. The new price is fifty each. Your holding is still worth the same. Only the share count and price shift.
Reading the result
The headline is your new share count. The tool also shows the new price. Multiply them and the value is unchanged. More shares at a lower price net out. Nothing is gained or lost in the split. The split only rescales your position.
Value stays the same
A split is a swap, not a windfall. Three hundred shares at fifty equal one hundred at one hundred fifty. The position value does not move. Only the count and price change. Treat the split as a relabel, not a gain. Your wealth before and after matches.
Common mistakes to avoid
One slip is thinking a split adds value. Another is forgetting to adjust the price. People also misread the split ratio. Each error breaks the new figures. Apply the ratio to both count and price.
The limits of this tool
This calculator covers a simple split. It does not handle cash in lieu of fractions. It ignores fees and taxes. It also skips any later price moves. Use it for the split itself only. Later market moves are a separate matter.
Forward versus reverse splits
A forward split raises the count and lowers the price. A reverse split does the opposite. A reverse split can lift a low price. Both leave the total value the same. Read which type before you apply it.
A final tip
Note the split date in your records. Your broker should adjust the figures for you. Check that the new count and price line up. A clear split keeps your records correct. Confirm the numbers right after the split.