the single most-skipped skill in leveraged trading is sizing. people obsess over entries and exits while every dollar they keep or lose is being decided by a number they pick in half a second. this guide is how to size a perp position based on your bankroll — the practical version, not the textbook one.
we are going to give you three concrete sizing methods, the math behind why they work, and the specific rip-unit method that fits one-tap arcade-style trading on uponly.win.
define your bankroll first
your bankroll is the money you are willing to lose entirely on perp trading without changing how you live this week. that is the only correct definition. everything else gets you in trouble.
- not "the money in my crypto wallet"
- not "what i can spare if i skip lunch for a month"
- not money earmarked for rent, debt, or a partner
- yes — fun-money, hobby budget, the loose dollars that exist only to entertain you
the three sizing methods that actually work
we are going to skip kelly criterion derivations and weird sharpe-ratio talk. these three methods are what real perp traders use, in plain english.
method one: fixed-fraction per trade
pick a fixed percentage of your current bankroll for each trade. classic numbers are 1%, 2%, or 5%. you size based on whatever your bankroll is right now, so as it grows you risk more in dollars, and as it shrinks you risk less.
on a $1000 bankroll at 2% per trade you risk $20 each rip. if you lose four in a row you are down to roughly $920 and the next trade is $18.40. it is mechanical, boring, and durable.
method two: fixed-unit per trade
pick a dollar number you stick to until your bankroll moves substantially. simpler than fixed-fraction, slightly less optimal. fine for arcade-style trading where reps matter more than precision.
on a $1000 bankroll you might pick $20 per rip and stay there until the bankroll either doubles or halves, then re-evaluate.
method three: the rip-unit method
this is the one we recommend for uponly.win specifically because it is built for the one-tap arcade format. pick a rip-unit you can comfortably take 20 losses on in a row. that becomes your collateral per rip.
math: bankroll / 20 = rip-unit. on a $200 bankroll, your rip is $10. on a $1000 bankroll, $50. if you cannot mentally handle 20 losses in a row at that size, the number is wrong.
why losing streaks are the real enemy
a 50% win rate at max leverage does not give you a 50% chance of being up after 10 trades — variance dominates. you can be 7-3 and crushing, or 3-7 and tilted. sizing is what lets you survive the 3-7 path long enough to get to the 7-3 one.
- 4 losses in a row at 25% of bankroll per trade = you are nearly out
- 4 losses in a row at 5% of bankroll per trade = you are down ~20%, fine
- 20 losses in a row at 5% of bankroll per trade = you are basically out
- 20 losses in a row at 5% of bankroll per trade with the rip-unit method = you survived, smaller but alive
how this interacts with uponly.win's mechanics
uponly.win randomizes the leverage between 75x and 500x on each rip. you do not pick it. that means your sizing has to account for the worst case — getting 500x on a fast pair during a volatile minute and being liquidated in seconds. the rip-unit method handles that automatically.
because uponly runs no house and charges zero fees on losing trades, your sizing math is cleaner than on house-model platforms. the only variable is the trade itself. no spread mark-up to compensate for, no close fee eating your remaining collateral on a stop-out. only winners pay a small variable platform cut.
practical sizing rules to live by
short, blunt, and applicable today.
- pick a rip-unit you can lose 20 times in a row — math: bankroll divided by 20
- never increase rip size to "win back" a loss — that is the path to ruin
- after a 5-rip losing streak, halve your unit until you have 3 wins
- after a 5-rip winning streak, do not double up — banking is the play
- cap a single day at 10 rips, regardless of result — boredom is a sizing problem
- withdraw 50% of any 5x bankroll milestone to a different wallet — protect the gains
how to top up after you blow up
because uponly.win charges zero on your losses, the only cost of rebuilding is the new capital. resist the urge to size up after a top-up — your edge has not changed, only your stress has. for a full rebuild plan, see how to recover from a blown perp account.
pair sizing with timing: how to find the best leverage for your trading style is the sibling skill that makes the whole thing work.
put it into practice
sizing is a habit, not a worksheet. you build it through reps with stakes that matter to you but do not threaten you. start small, stick to your rip-unit, and let the variance work itself out over enough trades. try uponly when you are ready to put a real number on a real button.