SP500 Lot Size Calculator
Size every S&P 500 trade to your exact risk. Enter your balance, risk and stop in points and get the lot size, set to your broker's dollar-per-point.
Position size calculator$1 per point per lot (CFD default — edit to match your broker).
How a SP500 lot works
The S&P 500 (US500, SPX500) is quoted in index points. Most CFD brokers pay $1 per point per 1 lot; some use $10 or $0.10 — set it to your broker's spec.
On futures the E-mini (ES) is $50 per point per contract and the Micro (MES) is $5 per point.
The S&P moves far fewer points than the Nasdaq or the Dow, so its stops are short in points — 5 to 20 is typical intraday — and CFD lot sizes are correspondingly larger.
SP500 lot sizes at a glance
Worked out with the calculator above. Left: a $10,000 account risking 1% ($100). Right: a $100,000 prop firm account risking 0.5% ($500).
| Stop | $10,000 · 1% | $100,000 · 0.5% |
|---|---|---|
| 5-point stop | 20.0 lots | 100.0 lots |
| 10-point stop | 10.0 lots | 50.0 lots |
| 20-point stop | 5.00 lots | 25.0 lots |
| 40-point stop | 2.50 lots | 12.5 lots |
$1 per point per lot (CFD default — edit to match your broker).
Frequently asked questions
How much is 1 point on the S&P 500 worth?
Usually $1 per point per 1 lot on CFDs (check your broker), $50 a point on an ES future and $5 a point on MES.
What lot size should I use for US500 on a $10,000 account?
At 1% risk ($100) with a 10-point stop at $1 a point: 100 ÷ (10 × 1) = 10 lots. On MES the same trade is 2 contracts ($5 a point).
Is US500 the same as SPX500 and SP500?
Yes — broker names for the same S&P 500 index. Only the dollar value per point differs between brokers.
Lot size calculators for other markets
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