The S&P 500 CFD is the calmest of the US index contracts: one lot moves $1 per index point on most brokers, and the index typically covers 40–80 points in a session. That makes it the index where tight stops are most defensible — and where traders most often oversize because the moves feel small. This calculator returns the lot size for your balance, risk and stop in points.
SPX500 (US500) CFD contract facts
| Item | Value |
|---|---|
| Standard lot | 1 contract, $1 per index point on most brokers (some use $10 or $50) |
| Micro lot (0.01) | $0.01 per point |
| Move of 1 point, 1 lot | $1 |
| Move of 50 points, 1 lot | $50 |
| Typical spread | 0.3–1.0 point during US hours; wider overnight |
| Typical daily range | roughly 40–80 points; 120+ on Fed and CPI days |
| Most liquid hours | US cash session, 13:30–20:00 UTC |
The calculator treats one "pip" as one index point at $1 per lot. If your broker's contract pays $10 or $50 per point, divide the result accordingly. The E-mini futures equivalent (ES) is $50 per point; the micro (MES) is $5.
The lot size formula for SPX500
Lot size = (Account balance × Risk %) ÷ (Stop in points × $1)Example 1 — $10,000 account, 1% risk, 25-point stop:
- Risk amount: $100
- Loss per lot: $25
- Lot size: 4.00 lots
Example 2 — $5,000 account, 1% risk, 40-point stop:
- Risk amount: $50
- Lot size: 1.25 lots
Example 3 — $100,000 prop-firm account, 0.5% risk, 30-point stop:
- Risk amount: $500
- Lot size: 16.67 lots
Quick reference: SPX500 lot size at 1% risk
| Account | 15-point stop | 25-point stop | 40-point stop | 80-point stop |
|---|---|---|---|---|
| $1,000 | 0.67 | 0.40 | 0.25 | 0.13 |
| $5,000 | 3.33 | 2.00 | 1.25 | 0.63 |
| $10,000 | 6.67 | 4.00 | 2.50 | 1.25 |
| $50,000 | 33.33 | 20.00 | 12.50 | 6.25 |
| $100,000 | 66.67 | 40.00 | 25.00 | 12.50 |
Halve for 0.5% risk; double for 2%.
What makes SPX500 different
- Lower volatility, larger lot counts. Because a point is $1 and the range is small, the lot sizes look large. A 4-lot position is only $100 of risk at a 25-point stop — but the same 4 lots on NAS100 at a 100-point stop is $400. Do not carry lot counts between indices.
- The range compresses and expands with the VIX. In a low-VIX regime the index moves 30 points a day and a 15-point stop works; in a high-VIX regime it moves 100 and the same stop is noise. An ATR-based stop adapts.
- The open and the last hour are the volatile windows. Mid-session is often flat. Stops set for the open are oversized for 16:00 UTC, and vice versa.
- Fed days are a different instrument. The 18:00 UTC decision and the press conference that follows produce the year's largest sessions. A 25-point stop through the statement is a coin flip.
- Everything correlates with it. NAS100, US30, Bitcoin during US hours and AUD/USD all move with the S&P on risk days. Count the combined exposure.
Common SPX500 sizing mistakes
- Reusing NAS100 lot sizes. They are two to three times too large for the same dollar risk at the S&P's tighter stops.
- Wrong contract multiplier. A $50-per-point contract is fifty times the risk this page assumes. Check the specification.
- Stops under 10 points. Inside the spread's news-hour range and inside a single 5-minute candle on most days.
- Sizing at the open with a mid-session stop. The first 30 minutes need room.
- Ignoring the futures roll. CFDs tracking ES roll quarterly with a price adjustment that can trigger a close stop.
Track your SPX500 trades in Fips
Fips's free trading journal records every index trade with its point result, R-multiple and time of day, which makes it easy to see whether your mid-session trades are dragging down your open-hour results. Connect an MT4, MT5 or cTrader account and trades import automatically. Backtest an S&P setup across high- and low-VIX periods before you size it live, and use the economic calendar for Fed and CPI dates.
Frequently asked questions
How much is 1 point on SPX500?
$1 per lot on most CFD brokers. Some contracts pay $10 or $50 per point; the E-mini future pays $50 and the micro pays $5.
What lot size should I use on a $10,000 SPX500 account?
At 1% risk and a 25-point stop, 4 lots. At a 40-point stop, 2.5 lots. At an 80-point stop, 1.25 lots.
What is a reasonable stop loss on the S&P 500?
Intraday setups commonly use 15–40 points, 4-hour setups 50–100, daily setups 120–250. Widen it on Fed and CPI days or stay flat.
Is SPX500 the same as US500 or SP500?
Yes — different tickers for the same S&P 500 CFD. The point value can differ by broker, so check the specification before you size.