Short Stock Profit Calculator
See what a short sale really earns. Enter your prices and the calculator nets out borrow fees, dividends, commissions and margin, then shows your return on capital and break-even price, live as you type.
Your trade
Price you sell short at
Price you repurchase at
Annualized return assumes the same result repeated over a full year; it is a simple, non-compounded figure for comparison only.
For education only, not investment advice. Borrow rates, margin requirements and fees vary by broker and by stock.
How short-sale profit is calculated
A short sale runs in the opposite order to a normal trade. You borrow shares from your broker and sell them immediately at the market price. Later you buy the same shares back (“covering” the position) and return them to the lender. You keep the difference if the price fell while you were short, and you lose the difference if it rose.
The headline math is simple: (entry price − cover price) × shares gives your gross profit or loss. The part most calculators skip is what happens next: the costs of carrying the position chip away at that number until you are left with your real, net result.
Worked example (the default values above)
Short 100 shares at $50 and you receive $5,000. Cover at $42 and you pay $4,200 back, a gross profit of $800. Holding for 30 days at an 8% annual borrow rate costs about $32.88, leaving roughly $767 net. Because you only had to post about $2,500 in margin, that is close to a 31% return on the capital you tied up, a far more useful number than the raw $800.
What this calculator factors in
Most short sell calculators stop at gross profit. These four inputs are where short selling actually differs from going long, and where your edge quietly erodes:
- Borrow fee. You pay an annual rate to borrow the shares. On easy-to-borrow large caps it is a fraction of a percent; on crowded or hard-to-borrow names it can run into double digits, which can swamp a small price move.
- Dividends owed. If the stock pays a dividend while you are short, you (not the lender) foot the bill. That is a direct cash cost on the ex-dividend date.
- Commissions. Largely zero at US brokers today, but still relevant for some accounts and for international or inactivity-fee structures.
- Margin posted. Shorting locks up capital as collateral. Measuring profit against that capital, not against the notional position, is the honest way to judge the trade.
Why return on capital beats the dollar figure
A $767 profit means very little on its own. Made on $2,500 of posted margin over a month, it is an excellent trade. Made on $250,000 over two years, it is barely worth the risk. That is why the calculator reports a return-on-capital percentage and an annualized figure alongside the dollar result, so you can compare a short against any other use of the same money. The annualized number simply scales your result to a full year and is meant for comparison, not as a forecast.
The risk that is not on the calculator
A long position can only fall to zero. A short position has no upper limit. If the stock keeps climbing, your loss keeps growing, and it can exceed the capital you posted. A sharp rally can trigger a margin call or a forced buy-in, and a short squeeze can spike the price far past anything the fundamentals justify. Size short positions accordingly and know your exit before you enter.
Shorting without a margin account: inverse ETFs
If the borrow fees, margin and unlimited downside feel like a lot of machinery just to bet against something, there is a simpler route. Inverse ETFs are built to move opposite their benchmark, so they rise when the market falls, and you buy them like any normal share. No borrow, no margin account, and your loss is capped at what you put in.
Browse the full list of inverse ETFs or, for digital assets, the inverse crypto ETFs. Just note that inverse ETFs reset daily and can drift from a clean “opposite of the index” over longer holds, so they suit shorter-term views.
Frequently asked questions
How do you calculate profit on a short sale?
You sell borrowed shares at the entry price and buy them back later at the cover price. Your gross profit is the entry price minus the cover price, multiplied by the number of shares. From that you subtract the borrow fee, any dividends you owed while short, and trading commissions to get your net profit.
What costs reduce short-selling profits?
Three main costs sit between your gross and net result: the borrow fee charged on the value of the shares you have borrowed, dividends you must reimburse the lender for if the stock pays one while you are short, and any commissions. Hard-to-borrow names can carry very high borrow rates, which is why this calculator treats the fee as an annual rate applied across your holding period.
How much capital do I need to short a stock?
Shorting requires a margin account. Under Reg-T rules a US broker generally requires you to post about 50% of the position's value as margin on top of the sale proceeds, and brokers often demand more on volatile or hard-to-borrow stocks. The calculator uses your margin requirement to express the result as a return on the capital you actually tie up, not just a dollar figure.
What is the break-even price on a short position?
It is the cover price at which your net profit is exactly zero once costs are included. Because borrow fees, dividends and commissions all work against you, the break-even cover price sits slightly below your entry price. You have to buy back a little cheaper than you sold just to cover your carrying costs.
Can I lose more than I invested when shorting?
Yes. A stock you buy can only fall to zero, but a stock you short has no ceiling, so your loss is theoretically unlimited. If the price rises sharply your broker can issue a margin call or close the position, and a short squeeze can force many sellers to cover at once, pushing the price even higher.
Do I have to pay dividends while I am short?
Yes. When you short a dividend-paying stock you are responsible for paying the dividend to the lender of the shares on the ex-dividend date. Enter the per-share dividend you expect to owe over your holding period and the calculator deducts it from your profit.
Is there a way to bet against a stock without shorting it?
Inverse ETFs are designed to rise when their benchmark falls, so they give you short-like exposure without a margin account, borrow fees or the risk of losing more than you invest. They reset daily and carry their own decay over longer holds, so they suit short-term views, but for many traders they are a simpler alternative to a direct short sale.