Lot size calculator for prop firms: risk that fits your rules

How to use the calculator at a prop firm

1. Enter your challenge size, e.g. 100,000 USD.
2. Choose your risk per trade – many prop traders use 0.25 to 1 %.
3. Enter instrument and stop-loss.
4. Read the lot size and check how many losses in a row you have before the daily limit.

Calculation with the daily limit

Losses until the daily limit = daily loss limit ÷ risk per trade

Example: 100,000 USD account, daily limit 5 % = 5,000 USD. With 0.5 % risk (500 USD) you have a buffer of 10 losses, with 2 % only 2. Then, for currency pairs: lot size = 500 ÷ (stop in pips × pip value).

FAQ

How much risk per trade at FTMO or other prop firms?

Many traders use 0.25 to 1 % per trade. That keeps several losses in a row far from the daily limit (often 5 %) and the overall limit (often 10 %). Your firm’s rules always take precedence.

Do open trades count towards the daily loss?

At many prop firms, yes: it is measured on equity, including open losses. Plan your risk so that several open trades together still fit within the limit.

What else does CRYPDEKS do?

The rule guard shows live how much room you have to daily and max loss, locks trading around major news and stops you by your own rules. The lot size calculator is also available as a MetaTrader 5 plugin.

Is CRYPDEKS a partner of FTMO?

No. CRYPDEKS is an independent tool for MetaTrader 5 and can be used at prop firms that offer MetaTrader 5, for example FTMO or FundingPips. The firm’s rules always apply.