Position size calculator
Turn account size, risk % and your stop into the exact number of shares.
Free calculators
Trading calculators that just work
Run the numbers before you take the trade — free, instant, and no sign-up. These four are also built into the Sereo app, alongside nine more.
Free tool
Stocks & risk
Free tool
Stocks & risk
Risk/reward calculator
Get your R:R and the win rate you'd need just to break even.
Free tool
Stocks & risk
Stock average calculator
Average down or up and see your true cost basis and live P&L.
Free tool
Options
Options payoff calculator
See breakeven, max profit and max loss with a live payoff chart.
In the app
All 13 calculators, in your journal
The four above are free on the web and in the app. Sereo Pro unlocks nine more, right where you log your trades.
Stocks & risk
Position Size Free
Risk / Reward Free
Average Down / Up Free
Reverse Average Pro
Profit / Loss What-If Pro
Compound Growth Pro
Loss Recovery Pro
Kelly Criterion Pro
FX Impact Pro
Options
From the maker of Sereo
More apps built the same way.
Private by design, useful offline and no extra subscription — the same philosophy behind Sereo.
PayClear
Subscription trackerTrack subscriptions, free trials and recurring bills privately. No bank login, no account — local reminders and a one-time lifetime unlock.
pay-clear.com
Calma
Sleep & focus soundsMix nature sounds, white noise and ambient layers for sleep, relaxation and deep focus. Works fully offline with a one-time lifetime unlock.
calmasounds.com