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PropBuffer

Position sizing for traders who've learned the hard way that 'eyeballing it' isn't a risk management strategy.

All calculations run locally in your browser. Your data stays with you.
PROSaved Profiles

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Cheaper than your last blown account.

1Pick Your Poison

Which firm's rules are keeping you up at night?

The Rules That Haunt You

Drawdown$2,500
TypeEOD Trail
Max Contracts10
Profit Target$3,000
ScalingActive — buckle up

Scaling Plan

Balance >= $50,0005 contracts
Balance >= $52,60010 contracts
2Where You Stand

Be honest. We won't judge. (We've been there.)

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3Trade Setup

What are you about to throw at the market this time?

Tick Size

0.25

Tick Value

$12.50

Point Value

$50.00

= $500.00 per contract (that's gonna sting)

%

% of your remaining drawdown buffer to risk. 25% is conservative. 100% is... a choice.

100Risk Score

Fortress Mode

Your risk management is tighter than your stop losses.

Drawdown Buffer
EOD Trail

Looking healthy. Try not to revenge trade it away.

$2,500.00100.0%
$47,500buffer range$50,000

Starting Balance

$50,000

Current Balance

$50,000.00

High Water Mark

$50,000.00

Drawdown Floor

$47,500.00

Position Size Result

1

ES contract

Limited by: Risk Budget

Constraint Breakdown

Risk Budget
1
Firm Limit
5
DD Buffer
5
Risk per contract$500.00
Total risk (1 contracts)$500.00
Balance after max loss$49,500.00
Drawdown floor$47,500.00

Unlock Trade Plan Export

Cheaper than your last blown account.

4What-If Simulator

The part where you stare at numbers and convince yourself you'll definitely take the winner.

Simulating 1 ES contract:

If Trade Wins+$750.00
New Balance$50,750.00
New HWM$50,750.00
New DD Floor$48,250.00(+$750.00)
New Buffer$2,500.00
If Trade Loses$-500.00
New Balance$49,500.00
New HWM$50,000.00
New DD Floor$47,500.00
New Buffer$2,000.00

Trailing Drawdown Alert

Win this trade and your drawdown floor moves UP by $750.00 (from $47,500.00 to $48,250.00). Your buffer stays the same even though you made money. Trailing drawdown: the gift that keeps on taking.

Pricing

No hidden fees. No monthly subscriptions. No overnight holding charges.

Demo Account
No strings attached. Like a demo, but useful.

$0

  • 3 prop firm presets (Apex, Topstep, Bulenox)
  • 16 futures contracts with real specs
  • Position size calculator with 4-way constraint check
  • Drawdown buffer gauge with color-coded health
  • Win/loss trade simulator with trailing DD alerts
  • All calculations run locally — no sign-up required
Funded
Full access. You passed the challenge.

$14.99 one-time

  • 3 prop firm presets (Apex, Topstep, Bulenox)
  • 16 futures contracts with real specs
  • Position size calculator with 4-way constraint check
  • Drawdown buffer gauge with color-coded health
  • Win/loss trade simulator with trailing DD alerts
  • All calculations run locally — no sign-up required
  • 5 additional prop firm presets
  • Custom firm rules — plug in any firm's numbers
  • Save & sync profiles across devices
  • Export trade plans as .txt files
  • Priority access to new firms and features

Frequently Asked Questions

PropBuffer is an educational tool. Not financial advice. Always verify rules directly with your prop firm.

Rule presets are based on publicly available information and may change. Commissions, fees, and slippage are not included.