Margin Calculator

One Word, Three Margins

In everyday language a margin is an edge or a cushion; in finance the word kept the cushion idea and specialized. It can mean the slice of a selling price that survives as profit, the equity slice an investor must contribute when borrowing to trade, or the deposit slice that secures a leveraged currency position. The three calculators above exist because the three ideas share a name and almost nothing else.

Profit Margin: The Health Gauge

Profit margin — profit divided by revenue — answers a simple question: of every dollar that came in, how much stayed? A 30% margin leaves $30 of profit per $100 of revenue. It is simultaneously a health gauge (a year that dips below a business's usual margin is an early warning, whatever the sales line says), an efficiency measure (profit per revenue dollar, comparable across periods), and a competitive benchmark — but only against genuinely similar businesses: a neighborhood restaurant and a chemical giant live in different margin universes, and comparing them teaches nothing. Margins improve from exactly two directions: raise prices, or cut the cost of what you sell. Its sibling, markup (profit ÷ cost), is the number merchants actually add at the pricing desk — which is why the conversion between the two, built into the calculator above, causes so much quiet damage when it's skipped.

Margin Trading: Borrowed Money, Amplified Everything

Buying securities with a broker's money is trading on margin. The collateral is the account itself; the effect is leverage — gains multiply, and so do losses, and a falling position can consume more than the cash originally committed. U.S. rules draw the guardrails: Regulation T caps the borrowed share at 50% of a purchase (the initial margin), and maintenance rules (FINRA floor 25%, brokers typically higher) force the account's equity share to stay above a minimum thereafter. The second calculator works with whatever requirement your broker actually imposes. Treat it as arithmetic, not encouragement: margin investing is genuinely high-risk, and the time to understand a margin call is before one arrives.

Currency Margin and the Margin Call

In foreign exchange, "margin" is a good-faith deposit — a slice of account equity reserved while a position is open, not a fee. Brokers express it as leverage: a 2% requirement is 50:1, 1% is 100:1, and retail traders routinely use 50:1 to 200:1 where regulations allow. If the market moves against the position far enough that the remaining equity can't support it, the broker issues a margin call: deposit more, or the positions are closed for you, at market prices, crystallizing the loss and protecting the account from going negative. The required-margin figure the third calculator returns is the amount locked up on day one — the losses it must absorb before the call comes are a separate, sobering calculation.

Frequently Asked Questions

Margin or markup for pricing?

Decide the margin you need (it connects directly to your income statement), then convert: required markup = margin ÷ (1 − margin). A 25% margin needs a 33.33% markup.

Is the stock "amount required" the maintenance or initial margin?

Whichever requirement you type in — the calculator multiplies position value by your percentage. Brokers quote both; check which one you're entering.

Why is the FX amount required so small?

Because leverage is doing exactly what it promises: at 20:1, $6.50 controls $130. The $130 is what's really at risk in the market; the $6.50 is just the deposit that stands in front of it.