Trade with calculated risk
A set of precise, fast, distraction-free trading tools: calculate your lot size, measure your risk and improve your process.
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All tools
Built to chain together: the result of one leads you to the next step in your trading plan.
Lot size calculator
Calculate the exact position size from your balance, risk and stop loss.
Open toolRisk/reward calculator
Measure the R:R ratio, the win rate you need and your mathematical expectancy.
Open toolMargin and pip value calculator
Calculate required margin, pip value and the notional size of your position.
Open toolForex market hours
Live clock of the Sydney, Tokyo, London and New York sessions and their overlaps.
Open toolTrading journal
Log your trades and get statistics: win rate, profit factor and losing streak.
Open toolDrawdown calculator
Find out how much you need to gain to recover a loss and how many losses in a row your account can take.
Open toolA workflow, not scattered calculators
- Calculate the lotFrom your risk and your stop loss.
- Validate the tradeCheck the risk/reward ratio and margin.
- Pick the momentSee which sessions are open right now.
- Log and improveRecord the result and review your stats.
Why ZaellabFX
Private by design
Calculations run in your browser. We do not ask for an account or store your balances on any server.
Fast and light
Static pages with very little JavaScript. Works well even on slow connections.
Transparent formulas
Every tool explains how it calculates, so you understand the result instead of just copying it.
Practical guides
Learn to calculate, manage risk and analyze your trading with real examples.
How to calculate lot size in forex, step by step
Learn how to calculate the right lot size for every trade with real examples on EUR/USD, USD/JPY and gold.
Read guideTrading risk management: the rules that protect your account
Risk per trade, R multiples, daily limits and pair correlation: the basics of risk management with numeric examples.
Read guideRisk/reward ratio and win rate: how they relate
What win rate you need at each R:R ratio and how to calculate your strategy’s mathematical expectancy.
Read guideLearn the key concepts
Clear definitions of the terms you will see in the tools.