Free · no signup

Futures trading calculators

Size every trade by risk, and know exactly how much room your prop account has left before a trailing-drawdown breach. Free to use, nothing to sign up for — and when you want it tracked automatically on every fill, that's what The Trader’s Tower is for.

Position size calculator

Risk a fixed dollar amount — get the contract count.

Instrument
$ / point
Tick size
0.25
Risk this much
Stop distance
Fill in risk and stop distance to get your size.
In The Trader’s Tower: size is auto-suggested from your remaining prop-account room, and every logged trade warns you on the ticket when a position eats too much of it.

Prop drawdown calculator

How much can you lose before the account is gone?

Account size
Max drawdown ($)
Drawdown type
Trail stops at ($)
Current balance
Liquidation threshold
$47,500.00
Room before breach
$2,500.00

You can lose $2,500.00 from here before this account is liquidated.

Preset numbers are from public info and may be out of date — confirm the exact rules with your firm. Trailing drawdown follows intraday peaks your fills can't fully see, so treat this as the tightest estimate.

In The Trader’s Tower: this updates automatically from your real fills on a live drawdown meter — across every Apex and Topstep account — plus profit-target and consistency tracking, so you always know your room.
Why traders sign up

These calculators are the free sample

The Trader’s Tower does this work for you — automatically, on every fill — and keeps the record that tells you whether you actually have an edge. Free during early access.

PnL journal & calendar

Every trade with scale-outs, R-multiple and a heat-shaded month.

Prop guardrails

Live trailing-drawdown, profit-target and consistency meters per account.

Edge analytics

Equity curve, expectancy, R-distribution, win rate by hour, weekday & setup.

Imports & autosync

TopstepX autosync, or drop a Tradovate/Apex CSV — reconstructed trade by trade.

AI weekly debrief

A coach that reads your week and tells you what to fix — grounded in your data.

Psychology & playbooks

Discipline, mistakes, setups — find the pattern behind the losses.