Perps calculators: position size, PnL, funding and liquidation.

Five quick tools for perps traders, built for prop accounts: size a trade from your risk, see how much room your drawdown gives you, and check PnL, funding and liquidation.

Position size calculator

How big to go so your stop costs exactly the risk you picked.

Position size (units)-
Risk ($)-
Position value-
Leverage used-
Stop distance-

Fees and slippage not included. Check the leverage against the firm's max for that market.

Prop account drawdown calculator

How far price can move against a position before you hit the daily loss limit or the max drawdown.

Move to daily limit-
Daily loss limit-
Max drawdown-
Move to max drawdown-
Leverage used-

Assumes you start the day at the account size with no other open trades. Firms measure limits differently, see the rules guide.

PnL calculator

Profit or loss on a perp trade, after trading fees.

Net PnL-
Gross PnL-
Fees-
Price move-
Position value-

0.045% is Hyperliquid's base taker fee. Prop firms set their own commissions. Funding not included.

Funding cost calculator

What funding costs or pays you while you hold a perp, at a steady rate.

Funding over the hold-
Per hour-
Per 24 hours-

A positive rate means longs pay shorts. Real rates change every hour. 0.00125% an hour is Hyperliquid's base interest rate.

Liquidation price calculator

Where an isolated position gets liquidated on an exchange like Hyperliquid.

Liquidation price-
Distance from entry-
Initial margin-
Maintenance margin-

Uses Hyperliquid's formula: maintenance margin is half the initial margin at max leverage. Ignores fees, funding and margin tiers. On a prop firm account you hit the drawdown limit long before this.

How do I calculate position size on a perp?

Risk in dollars divided by the distance to your stop. Risking $500 with a stop $2,000 below a $100,000 entry gives 0.25 units, a $25,000 position. On a $50K account that's 0.5x leverage.

How do I work out the leverage I'm using?

Position value divided by your account or margin. A $250,000 position on a $50K account is 5x. Prop firms cap leverage per market, so check the firm's limit before you size.

How far can price move before I hit the daily loss limit?

Daily loss limit in dollars divided by your position value. A 3% limit on $50K is $1,500. With a $250,000 position, a 0.6% move against you hits it. Most perps prop firms count open PnL toward the limit.

Rules to know

How is PnL calculated on a perp?

Side times exit minus entry times size, with side 1 for long and -1 for short. Long 0.5 BTC from $100,000 to $101,000 is $500 gross. At 0.045% per side, fees are about $45, so you net about $455.

How is funding calculated?

Position value times the funding rate for each interval. Hyperliquid charges it every hour and uses the oracle price to value the position. At 0.00125% an hour, a $100,000 position pays $1.25 an hour, $30 a day.

How is liquidation price calculated?

On Hyperliquid you're liquidated when account equity drops below maintenance margin, which is half the initial margin at the market's max leverage. Long 1 BTC at $100,000 with 10x isolated on a 40x market gets liquidated around $91,139.

What is Hyperliquid?