How to Calculate Lot Size for AUDUSD: Position Sizing and Pip Value
BY TIOmarkets
|March 22, 2026Knowing your lot size before you enter an AUDUSD trade is a fundamental part of managing risk. The lot size you choose determines how much you gain or lose for each pip the price moves, which in turn defines how much capital you are putting at risk on any given position.
This guide covers the AUDUSD contract size at TIOmarkets, how to calculate pip value, how margin is calculated, and how to use a position sizing formula to arrive at a lot size that fits your risk tolerance.
AUDUSD Contract Size
At TIOmarkets, one standard lot of AUDUSD represents AUD 100,000 of the base currency. The minimum trade size is 0.01 lots, which equals AUD 1,000. You can trade in increments of 0.01 lots between those two points, allowing precise position sizing at any account size.
The three most common lot sizes are the standard lot at 1.0 (AUD 100,000), the mini lot at 0.1 (AUD 10,000), and the micro lot at 0.01 (AUD 1,000). Retail traders typically use mini or micro lots to keep risk proportionate to their account balance.
AUDUSD Pip Value
AUDUSD is quoted with USD as the quote currency. This means the pip value is denominated directly in USD, without any additional conversion step for traders holding USD-denominated accounts.
A pip on AUDUSD is the fourth decimal place of the exchange rate, equal to 0.0001. For a standard lot, the pip value is 0.0001 multiplied by 100,000, which equals USD 10. For a mini lot, the pip value is USD 1. For a micro lot, the pip value is USD 0.10.
These figures apply to accounts held in USD. If your account is denominated in a different base currency, the USD pip value will be converted into your account base currency at the prevailing exchange rate at the time of the trade.
Because USD is the quote currency, the pip value in USD does not change as AUDUSD moves. A pip on a standard lot is always worth USD 10 regardless of whether AUDUSD is trading at 0.6000 or 0.7500. This makes AUDUSD straightforward for pip value calculations compared to pairs where the USD is the base currency.
Margin Requirement for AUDUSD
TIOmarkets applies a 1% margin requirement to AUDUSD. To open a position, you need to have at least 1% of the total notional value of the trade available as margin. Margin requirements are subject to change depending on market conditions and applicable regulatory requirements.
The notional value of a trade is calculated in USD. For a standard lot, the notional value is AUD 100,000 converted to USD at the current AUDUSD exchange rate. If AUDUSD is trading at 0.6500, the notional value is USD 65,000 and the required margin is USD 650. If AUDUSD is at 0.7000, the notional value is USD 70,000 and the required margin is USD 700. The margin requirement in USD therefore shifts as the exchange rate moves.
For a mini lot at 0.6500, the required margin is USD 65. For a micro lot, it is USD 6.50 at the same rate.
If you are using the unlimited leverage feature on the Standard account with MT5, margin scaling applies based on your account equity. The 1% margin tier applies at equity levels of USD 5,000 to USD 19,999. Different tiers apply above and below that range. The unlimited leverage feature is available on the Standard account only and is not available on Raw or VIP Black accounts.
Position Sizing for AUDUSD
Position sizing links your lot size to a defined risk amount per trade. The standard method is to decide the maximum dollar amount you are willing to lose if your stop loss is hit, then work backward from your stop distance to find the appropriate lot size.
The formula is: lot size = (account balance x risk percentage) / (stop loss in pips x pip value per lot).
A worked example for a USD account: suppose you have a USD 5,000 account and you are willing to risk 1% per trade, which is USD 50. You plan to place a stop loss 40 pips from your entry on AUDUSD. The pip value for a standard lot is USD 10.
Dividing USD 50 by 40 pips gives USD 1.25 risk per pip. Dividing USD 1.25 by USD 10 (the pip value per standard lot) gives 0.125 lots. You would round this to 0.12 lots, or trade 0.1 lots to keep comfortably within your risk limit.
This calculation keeps your maximum loss on the trade close to 1% of your account regardless of where the stop is placed. Because the AUDUSD pip value in USD is fixed regardless of the exchange rate, the position sizing calculation is consistent and does not need to be recalculated as the rate moves.
Using TIOmarkets Calculators for AUDUSD
TIOmarkets provides three online calculators to help you work out AUDUSD trade parameters before placing an order.
The pip value calculator lets you enter your account currency, the currency pair, and the number of lots. It returns the pip value expressed in your account base currency, including any conversion from USD if your account is not USD-denominated.
The margin calculator lets you enter the currency pair, your account currency, your leverage, and your lot size. It returns the exact margin required to open the position.
The profit calculator lets you enter a currency pair, trade direction, entry price, exit price, and lot size. It returns the estimated profit or loss in your account currency, useful for checking reward-to-risk ratios before committing to a trade.
Trading Costs on AUDUSD
AUDUSD spreads at TIOmarkets are variable and fluctuate with market conditions. Minimum spread figures represent the tightest conditions and are typically higher under normal trading conditions. Spreads can widen during high volatility periods or around economic news releases.
On the Standard account, there is no commission and the spread starts from 1.1 pips. On the Raw account, the spread starts from 0.0 pips with a commission of USD 6 per round turn lot. The full commission is charged when the position is opened and covers both the opening and the closing of the trade. On the VIP Black account, the spread starts from 0.3 pips with no commission.
AUDUSD carries an overnight swap charge or credit for positions held past the daily rollover. The swap rate for AUDUSD is not published on the instrument page and should be checked inside the MT4 or MT5 platform before holding positions overnight.
Orders on AUDUSD are executed at the best available market price, which may result in positive or negative slippage. Demo accounts often execute instantly and may not fully replicate live slippage conditions.
FAQ
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