Options Trading for Beginners: Calls, Puts and Premium Explained

Buy one call quoted at $2.50 and $250 leaves your account. The quote is per share. One standard equity option contract covers 100 shares, and that multiplier causes more beginner confusion than every Greek letter combined, so the fastest route through the vocabulary is to take one contract and follow it all the way to expiry, price by price, until the terms stop being terms.

One call, start to finish

A stock trades at $100. You buy one call expiring in 42 days. The strike is $105, and the ask is $2.50. A call is the right to buy 100 shares at the strike price. That is all a strike is: the price the right lets you transact at.

cost = premium x 100 = $2.50 x 100 = $250

That $250 is the entire exposure. The company could announce an accounting fraud on Monday and you would still be out $250 and nothing more, which is the one genuinely comforting property of a long option.

At expiry the contract is worth whatever the stock exceeds $105 by. Otherwise it is worth nothing.

value at expiry = (stock price - $105) x 100, floored at zero

breakeven = strike + premium = $105 + $2.50 = $107.50

Stock at expiry	Contract value	Cost	Profit or loss	Return on $250
$95.00	$0	$250	-$250	-100%
$100.00	$0	$250	-$250	-100%
$105.00	$0	$250	-$250	-100%
$107.50	$250	$250	$0	0%
$110.00	$500	$250	+$250	+100%
$115.00	$1,000	$250	+$750	+300%
$120.00	$1,500	$250	+$1,250	+500%

Read the top of that table before the bottom. The stock can rise 5% and the contract still pays zero. That is the move from $100 to $105. It can rise 7.5% and pay back exactly what you spent. A long call asks you to be right about direction, size and timing at once, and only the first of those three feels like a normal opinion about a company, which is why buyers who read the company correctly still hand back the premium.

The bottom three rows are why anyone buys them anyway. A 20% move in the stock turns $250 into $1,250. That ratio is the whole product. The first three rows are its price.

The five numbers on one chain line

Four of the five are fixed by the exchange when the contract is listed. The underlying is the stock the contract is written on. The strike is the transaction price. The expiration is the date the right ends. Standard monthly equity options expire on the third Friday of the expiration month. The type is call or put.

Only the premium moves, and the premium is what the market argues about all day.

An options chain lists every strike for one expiration, calls on one side and puts on the other, with a bid, an ask and a volume figure on each line. A $100 stock might carry strikes every $1 near the money. Further out they thin to every $5. The skill in reading a chain has little to do with picking a direction and everything to do with spotting which lines are liquid enough to trade, because single digit volume and open interest mean a wide quoted spread, and you pay that spread on the way in and again on the way out.

The put, running backwards

Same stock at $100. You buy one put with a $95 strike for $2.00. The cost is $200. A put is the right to sell 100 shares at the strike.

breakeven = strike - premium = $95 - $2.00 = $93.00

value at expiry = ($95 - stock price) x 100, floored at zero

Stock at expiry	Contract value	Cost	Profit or loss
$105.00	$0	$200	-$200
$100.00	$0	$200	-$200
$95.00	$0	$200	-$200
$93.00	$200	$200	$0
$90.00	$500	$200	+$300
$85.00	$1,000	$200	+$800
$80.00	$1,500	$200	+$1,300

Hold 100 shares at $100 alongside that put and you have bought a floor. However far the stock falls you can sell at $95, and you paid $2.00 for the privilege, so $93 is the worst outcome on the combined position. Insurance is the right mental model. The premium is gone whether or not you ever claim.

Premium splits in two

Moneyness is the label for where the stock sits relative to the strike. With the stock at $100, a $105 call is out of the money, a $95 call is in the money by $5, and a $100 call is at the money. The labels invert for puts: the $95 put is out of the money and the $105 put is in the money by $5.

premium = intrinsic value + extrinsic value

Intrinsic value is what the contract would be worth if it expired this second. Everything above that is extrinsic value, also called time value, and it is what the market charges for the possibility that the stock moves before the date runs out.

Contract, stock at $100	Premium	Intrinsic	Extrinsic
$105 call	$2.50	$0.00	$2.50
$100 call	$4.10	$0.00	$4.10
$95 call	$7.20	$5.00	$2.20
$95 put	$2.00	$0.00	$2.00
$105 put	$6.80	$5.00	$1.80

Those quotes are illustrative and tidier than a real chain. Dividends, borrow costs and plain thin trading push real numbers around. The structure holds regardless. The $105 call is 100% time value, so unless the stock clears $105 it is worth exactly zero on expiry day, and the rate at which it drains has a name, theta. The price of that time is a question about implied volatility.

The other side of the trade

Somebody sold you that call. Their position is the mirror of yours with every sign flipped. The risk moved. It did not shrink.

Position	Premium	Max profit	Max loss
Long $105 call	Pay $250	Unlimited above $107.50	$250
Short $105 call, uncovered	Collect $250	$250	Open ended
Long $95 put	Pay $200	$9,300 if the stock goes to zero	$200
Short $95 put	Collect $200	$200	$9,300 if the stock goes to zero

The short put figure is plain subtraction. You are obliged to buy 100 shares at $95, which is $9,500, and you keep the $200, so $9,500 - $200 = $9,300 is the floor. Anyone describing put selling as income should be asked to write that number down first. The mechanics get their own treatment in cash-secured puts. The covered version of the short call is in covered calls.

Selling a call with no shares behind it is the only structure here with no arithmetic ceiling on the loss, because stock prices have no upper bound, and brokers restrict it to high approval levels and substantial margin, which is a restriction doing you a favour.

Exercise, assignment and the Friday boundary

American-style equity options can be exercised by the holder at any time up to expiry. Most index options are European style, meaning exercise happens only at expiration. The style is a contract specification you can look up. It decides whether a seller carries early assignment risk at all.

Exercising that $105 call means paying $10,500 for 100 shares. Almost nobody does this, because selling the contract captures intrinsic value plus whatever time value survives and requires no cash for shares. Exercise is for people who want the stock.

If you are short and get assigned, the obligation simply lands. An assigned $95 put takes $9,500 out of the account. It puts 100 shares in. Early assignment becomes more likely as a short option goes deep in the money, and on short calls it clusters around dividend dates.

Options that finish in the money by a penny or more are generally exercised automatically by the clearing house unless you instruct otherwise, so if you are short and do not want shares, close the position before the bell on expiration day.

Then there is the boundary itself, which textbooks underplay. A stock can close at $104.95 on Friday, kill your $105 call, and open at $112 on Monday after weekend news. The contract ended on Friday. That move belongs to whoever owns the shares. Being directionally correct gets you none of it.

Three ways beginners lose money, all of them arithmetic

Buying cheap far out of the money calls because $20 feels harmless. The contract costs $0.20 for a reason. The strike is priced for a move the market thinks rarely arrives, so a low price is a statement about probability, and paying it repeatedly is a slow way to fund somebody else’s holidays.

Forgetting the multiplier when sizing. Ten contracts at $2.50 is $2,500, and traders who think in per share terms put on positions several times the size they intended with no sense of having done anything unusual. Size options in dollars at risk, exactly as you would size stock. The approach is in risk management for traders.

Buying an option into earnings without checking what the market already charged for the event. Premiums inflate before the announcement and collapse after it. The stock can move your way while the contract loses half its value. That mechanism, worked with numbers, is the earnings volatility crush.

Once one contract is comfortable, the useful next step is the Greeks, which describe how the premium moves in the days before expiry, and then vertical spreads, which cap both ends of the payoff for a smaller outlay. Draw any structure on the options strategy builder before you trade it, then check what stuck with the options fundamentals quiz.