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01
Pick a calculator
No account, no onboarding. Open the tool you need — risk of ruin, position size, margin, whatever the trade in front of you calls for.
Trading tools
Tools that check your math and your discipline before the market does.
Small, narrow tools for the parts of trading that actually break accounts. No signals. No strategies to sell. Just calculations, checks, and reports that keep you honest.
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product screenshot
How it works
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Enter your real numbers
Account size, win rate, entry, stop, leverage — whatever the calculator asks for. Every field is typed in by hand, no presets to hide behind.
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Read the plain-language result
Every output comes with the reasoning underneath it, not just a number — so you understand why it matters before you place the trade.
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Decide with the math
Nothing is saved, nothing is sent anywhere. You close the tab knowing the number, not trusting a gut feeling.
Tools
01
Live
Risk of Ruin Calculator
1,000-run Monte Carlo simulation showing the real probability of losing 10%, 25%, or 50% of your account based on your win rate, reward:risk, per-trade risk, and number of trades. Get a Kelly criterion and sizing check.
Open the calculator →
02
Live
Position Size Calculator
Set your account size, risk per trade, entry, and stop — get the exact number of shares or units to buy so a stop-out costs exactly the percentage you chose, no more.
Open the calculator →
03
Live
Margin Calculator
Enter your account size, trade size, entry price, and leverage — see exactly how much margin the trade locks up, how much stays free, and how close you are to a margin call.
Open the calculator →
04
Live
Leverage Calculator
Enter your account size, entry price, trade size, and the margin you're willing to commit — see exactly how much leverage that requires, and how far it leaves you from a margin call.
Open the calculator →
05
Live
Compounding Calculator
Project a starting balance forward across many periods at a fixed gain per period, reinvested each time — see the growth curve and how it compares to a flat, non-compounded return.
Open the calculator →
06
Live
Drawdown Recovery
Enter your account size and how much it drew down — see the exact gain required to get back to even, and why that gain is always bigger than the drawdown itself.
Open the calculator →
07
Coming soon
Pre-Trade Rule Gate
A check before every trade for a clear pass or fail. Enter your win rate, reward:risk, per-trade risk, allowed sessions, a news blackout window, and max trades per day — then go.
Notify me when it's live
08
Coming soon
Backtest Grader
Upload one MT5 Strategy Tester report. Get a blunt letter grade and a plain-English verdict on whether the strategy is a real edge or just got lucky. One upload, one result, under a minute.
Notify me when it's live
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Calculators live
$0
Cost, no card required
0
Accounts or sign-ups needed
100%
Client-side — your numbers stay in your browser
Check the math before your next trade.
Browse the toolsFrom traders
Placeholder quote — swap in real feedback once you have it.
Name, role
Placeholder quote — swap in real feedback once you have it.
Name, role
Placeholder quote — swap in real feedback once you have it.
Name, role
Reading
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Why most position sizes are wrong before the trade starts
The one input traders round off — and why it quietly changes your real risk per trade.
Read more — coming soon
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The math behind risk of ruin, explained without the jargon
What "risk of ruin" actually measures, and why a 60% win rate can still ruin an account.
Read more — coming soon
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Why the gain to recover a drawdown is never symmetric
A 20% loss doesn't need a 20% gain to break even — it needs 25%. Here's the asymmetry, and why it compounds.
Read more — coming soonAbout
Cephic is built by one person, not a company — currently focused on the free calculators before moving on to the paid tools. Each tool is its own small app: no login, no account system, no ads, and no upsell funnel between them.