Natural gas futures contracts come in three sizes, and picking the wrong one is the most common unforced error in gas trading. The full NG contract moves $100 per penny; the Micro moves $10. Same market, same chart, tenfold difference in how fast a mistake compounds. Before any strategy discussion — and our complete natural gas trading guide has plenty — you need the contract mechanics cold: sizes, ticks, margins, settlement, and the expiration calendar. That is what this reference covers.
All three contracts are listed by CME Group on NYMEX and price gas delivered at Henry Hub in Erath, Louisiana. Everything else about them differs in ways that matter — size, tick, settlement, liquidity, and who they are built for. The differences are not cosmetic: they determine your leverage, your exit options, and how expensive your mistakes are while you learn.
The Three Natural Gas Futures Contracts: NG, QG, MNG
Full-size Henry Hub futures (NG)
NG is the benchmark instrument — the contract that global gas prices are quoted from, and the one commercial hedgers actually use. The load-bearing specs:
- Contract unit: 10,000 MMBtu
- Minimum tick: $0.001 per MMBtu = $10.00 per contract
- Notional at $3.50 gas: $35,000
- Settlement: physical delivery at Henry Hub
- Listings: consecutive monthly contracts stretching more than a decade forward
- Last trading day: three business days before the first calendar day of the delivery month
Translate the tick math into risk before trading a single lot: a one-cent move is $100, and a routine 15-cent winter day swings $1,500 per contract. Liquidity is superb in the front two months — this is one of the most actively traded commodity futures in the world — and decays as you go further out the curve. Exact current specs and margins live on the CME Group NG contract page; always verify there, because margins change with volatility.
E-mini natural gas (QG)
QG is one-quarter of NG: 2,500 MMBtu. Two details trip people up. First, the tick is coarser — $0.005 per MMBtu, worth $12.50 — so you cannot work orders at the fine price increments NG offers. Second, QG is financially settled: at expiration it cash-settles against the NG final settlement price, so there is no delivery obligation. The trade-off is liquidity. QG volume is a small fraction of NG’s, spreads run wider, and since the Micro launched, the E-mini has been squeezed into an awkward middle. It still suits accounts that want roughly quarter-size exposure without trading four Micros.
Micro natural gas (MNG)
MNG is one-tenth of NG: 1,000 MMBtu, tick $0.001 worth $1.00, financially settled against NG like the E-mini. Margin is a few hundred dollars per contract. This is the right learning vehicle, full stop. Every mechanic in this article — margin calls, rolls, settlement, limit moves — behaves identically in the Micro at one-tenth the cost of tuition. It also lets small accounts scale: four MNG lots approximate one QG, ten approximate one NG, and you can peel off risk one thin slice at a time.
Contract Comparison Table
| Feature | NG (Full) | QG (E-mini) | MNG (Micro) |
|---|---|---|---|
| Contract size | 10,000 MMBtu | 2,500 MMBtu | 1,000 MMBtu |
| Minimum tick | $0.001 = $10.00 | $0.005 = $12.50 | $0.001 = $1.00 |
| Value of a 1-cent move | $100 | $25 | $10 |
| Settlement | Physical delivery at Henry Hub | Cash, vs. NG final settlement | Cash, vs. NG final settlement |
| Typical initial margin (2026) | ~$4,000 | ~$1,000 | ~$400 |
| Liquidity | Excellent (front months) | Thin | Moderate, front month |
| Best suited for | Hedgers, professionals | Quarter-size positioning | Learning, small accounts, scaling |
Margins shown are indicative for calm markets; CME resets them frequently and brokers often add house premiums on top.
Physical vs. Cash Settlement: What Delivery Actually Means
The full NG contract is physically delivered. Hold a short into expiration and you owe 10,000 MMBtu of ratable delivery at Henry Hub across the contract month; hold a long and you are taking that gas. For producers and utilities this is a feature — the futures hedge can become the physical sale. For speculators it is a deadline: exit or roll before the last trading day. In practice brokers close retail positions before delivery risk arises, usually with a warning call and sometimes with an unceremonious market order. Well under 1% of contracts ever go to delivery; the mechanism exists to keep futures pinned to the physical market, and it works.
QG and MNG remove the question entirely. Both cash-settle against the final settlement price of the corresponding NG contract — you end up with a P&L entry, not a gas nomination. That makes them cleaner for purely financial traders, at the cost of the E-mini’s thin book. One nuance worth knowing: because both settle to NG’s final print, they inherit whatever happens in the NG expiration, including the occasional squeeze-driven weirdness of settlement week.
Margin: How the Leverage Actually Works
Futures margin is not a down payment; it is a performance bond. You post initial margin to open a position (roughly $4,000 per NG contract in mid-2026, ~$1,000 for QG, ~$400 for MNG) and must keep account equity above the lower maintenance margin (typically about 90% of initial). Fall below maintenance and you get a margin call: top the account back up to initial, or your broker liquidates — many futures brokers auto-liquidate intraday without a courtesy phone call.
Work one example, because the arithmetic is sobering. You buy one NG contract at $3.50 with $5,000 in the account. Gas drops 15 cents — a completely ordinary day. That is a $1,500 loss; equity is now $3,500, below maintenance of roughly $3,600. You are on a margin call after one normal-sized adverse day. The same move against one Micro costs $150. This is why the standing advice is to hold cash of several multiples of margin per contract, and why our step-by-step futures trading walkthrough spends so much time on position sizing before it ever discusses entries.
Two structural warnings. First, margins are procyclical: when volatility explodes, CME raises requirements — sometimes 50% or more in steps — exactly when losing positions are bleeding. Traders who run fully margined books get forced out at the lows by the margin hike, not the market. Second, day-trading margins (the discounted intraday rates some brokers offer) are a broker courtesy, not an exchange right, and they get revoked in fast markets. Never build a strategy that only works at discount margin.
The Expiration Calendar and Settlement Week
NG expires three business days before the first calendar day of the delivery month — in practice, in the last few trading days of the prior month (holiday calendars shift the exact date, so check CME’s listings rather than computing it in your head). The options on each future expire one business day before the future itself, and the final settlement price is established in the closing window of the last trading day.
Settlement week has its own microstructure. Liquidity migrates to the next month, open interest in the expiring contract collapses, and the remaining book gets thin enough that determined flows push price around — the periodic CFTC and exchange enforcement cases about expiry-window trading exist for a reason. Retail rule of thumb: be out of the expiring month a week early. There is nothing in the last few days for you except wider spreads and other people’s games.
The roll
Position traders holding through expiration windows must roll: close the expiring month, open the next. Do it as a calendar spread order (sell front/buy next in one transaction) rather than legging it separately — one execution, one spread cost, no naked interval. The roll’s price depends on the curve: rolling a long in contango costs you the spread each month (the drag that eats natural gas ETFs alive); rolling in backwardation pays you. Over a year, roll yield can matter more than your directional call, which is why professionals treat the calendar spread itself as a first-class trade and quote seasonal strips rather than single months.
Reading the Curve: Contango, Backwardation, and the Saw-Tooth
Pull up the full NG strip and you will see gas’s signature shape: winter months (November–March) priced above the adjacent summers, year after year, like teeth on a saw. That is storage economics made visible — the market pays you to inject summer gas and store it for winter. Layered on the seasonal shape is the usual inventory signal: front months below deferred (contango) when supply is comfortable, front above deferred (backwardation) when the market wants gas immediately. A cold-snap flip from contango into backwardation at the front of the curve is one of the most reliable tightness tells in commodities. The price of gas at the benchmark, and why that curve anchors every regional price in North America, is unpacked in our guide to Henry Hub pricing.
Natural Gas vs. Crude Oil Futures
Traders coming from crude will find the furniture familiar and the physics different:
- Size and tick: NYMEX WTI (CL) is 1,000 barrels with a $0.01 tick worth $10 — the same $10 tick value as NG, a design convenience that makes cross-market risk comparisons easy.
- Volatility: gas runs structurally hotter, with pronounced winter/summer regime shifts; crude’s volatility is event-driven and less seasonal.
- Drivers: gas trades weather, storage, and LNG; crude trades OPEC, geopolitics, and the global economy.
- Curve: gas has the seasonal saw-tooth; crude’s curve is comparatively smooth.
- Settlement: both benchmark contracts are physically delivered (Henry Hub; Cushing, Oklahoma) with cash-settled minis and micros alongside.
Plenty of traders run both books — the skills transfer, the correlations are loose, and the diversification is real.
Contract Months, Codes, and the Strip
Every listed month trades under a single-letter code, unchanged since the pit era: F (January), G (February), H (March), J (April), K (May), M (June), N (July), Q (August), U (September), V (October), X (November), Z (December). So NGZ26 is December 2026 gas. Learn them once; every platform, broker statement, and desk conversation assumes you have.
NG lists consecutive months more than a decade out, but liquidity is ruthlessly front-loaded: the first two or three months carry most of the volume, the current-year winter months stay reasonably active, and the deep back months trade by appointment. Professionals rarely quote single distant months anyway — they trade strips, the average of a run of months: the winter strip (November–March), the summer strip (April–October), or calendar-year strips. A producer hedging 2027 output sells the Cal-27 strip, not twelve separate legs. Strip pricing is also analytically useful: when a cold snap rallies the front month but next winter’s strip barely moves, the market is telling you the shock is weather, not structure.
Seasonality gives specific months personalities. The January (F) and February (G) contracts carry the fattest weather premiums and the wildest expirations. March (H) is the storage-endgame contract, and the March/April (H/J) spread — the “widowmaker” that broke Amaranth in 2006 — is the most famous calendar spread in commodities. October (V) prices peak storage. Trade the month you actually mean.
Case Study: When Margin Met Crisis
Two recent episodes show why margin mechanics deserve a full section of this article rather than a footnote.
February 2021 — Winter Storm Uri. As the freeze hit, futures rallied hard, but the physical market went vertical — spot gas at some mid-continent hubs traded in the hundreds of dollars per MMBtu. Exchanges and brokers raised margin requirements sharply into the chaos. Traders who were sized to survive the price move but not the margin hike got liquidated anyway; being right eventually was worthless without the cash to stay in the room. Uri also cash-settled a brutal lesson about basis: a Henry Hub futures hedge did nothing for utilities buying physical gas at exploded regional prices.
2022 — the global squeeze. Gas ran from under $4 to nearly $10 between spring and late August, and NG initial margins ballooned to multiples of their calm-market levels. The mechanical consequence: the same account could safely hold perhaps a third of the contracts it held a year earlier. Traders who did not shrink accordingly were forced sellers into strength or forced buyers into weakness — the margin system converts volatility into flows, and it does not care about your thesis. Budget for margin at crisis levels, not at today’s levels, and the exchanges’ periodic hikes become an inconvenience instead of an exit.
Options on Natural Gas Futures
Each NG month carries a listed options market, expiring one business day before the underlying future. For retail traders, options solve the two ugliest properties of gas futures: unlimited loss and gap risk. A long call or put caps the downside at premium paid — no margin call at 3 a.m., no gap through a stop. The cost is that gas options are expensive precisely when you want them (winter implied volatility is no secret), and selling them naked to harvest that premium is how more than one fund has died; the upside tail in this market is measured in multiples, not percentages. Reasonable uses: defined-risk directional trades around events, strangles when you expect a bigger move than the market prices, and protective options against futures positions held over weekends and storage reports. Unreasonable use: funding anything by selling uncovered winter calls.
Common Mistakes with Natural Gas Futures Contracts
- Sizing by margin instead of by volatility. “I have $8,000, margin is $4,000, so I can trade two contracts” is the fastest route to a blown account in this market. Size from the dollar value of a bad day, not from minimum margin.
- Forgetting QG’s half-cent tick. Orders priced at increments the contract doesn’t trade get rejected or rounded; scalping strategies calibrated to NG’s tick don’t transfer.
- Holding the expiring month too long. Wide spreads, evaporating open interest, and — in full NG — delivery exposure. Nothing there is worth it.
- Legging the roll. Selling the front and “waiting for a better price” on the next month converts a spread trade into an outright gap risk. Use the calendar spread order.
- Ignoring roll cost in carry trades. A long position rolled monthly through contango bleeds the spread twelve times a year — often several percent — before the market has moved at all.
- Trusting day-trade margin overnight. The discount is intraday only; positions held past the cutoff must meet full margin immediately, and brokers enforce it by liquidation.
- Treating a limit pause as a floor. Limits expand. The market reopens lower. Plan exits before the halt, not during it.
Who Is on the Other Side of Your Trade
Contract mechanics make more sense once you know who uses each one, because every spec exists to serve somebody’s workflow:
- Producers sell futures and strips to lock in prices on future output. They are structural sellers of the back of the curve, which is one reason deferred winters often look “cheap” relative to what winters end up doing — hedging pressure is a real, persistent flow.
- Utilities and gas distributors buy winter months to fix costs for regulated customers. Structural buyers of exactly what producers sell; the futures market is largely these two groups meeting in the middle.
- LNG exporters and marketers hedge feedgas purchases and cargo sales, increasingly linking NG flows to TTF and JKM hedges on other exchanges.
- Funds and CTAs trade the curve, momentum, and weather — the fast money that provides liquidity most days and consumes it all at once on the bad ones.
- Retail traders cluster in the front month and, sensibly, in the Micro.
The CFTC’s weekly Commitments of Traders report breaks open interest into these camps. It is worth a glance before positional trades: when managed money is at a record short and price has stopped falling, the squeeze fuel is visible in public data — a setup that has preceded several of the sharpest rallies of recent years. None of this tells you what gas is worth. It tells you who is positioned to be wrong, which in a levered market is often the better question.
The numbers worth memorizing
Desk shorthand, for when there is no time to look things up: NG = 10,000 MMBtu, a penny is $100; MNG = 1,000 MMBtu, a penny is $10; QG ticks in half-cents worth $12.50; expiration falls three business days before the delivery month begins; options die the day before the future. Margins float — assume $4,000-and-rising per NG in any volatile stretch. And the fundamental calendar never moves: storage data every Thursday at 10:30 a.m. ET from the EIA storage dashboard, weather model runs morning and evening, bidweek at month-end. Everything else in gas trading changes; these are the constants the rest is built on.
Tick Math and Worked P&L Examples
Run the numbers before the market runs them for you.
Example 1 — full contract, modest move. Buy one NG at $3.500, sell at $3.560. That is 60 ticks × $10 = +$600, against roughly $4,000 margin, in a move the market makes most weeks. Reverse it and the same routine wiggle costs $600 — the leverage is symmetric even when confidence is not.
Example 2 — micro, storage-report scalp. Short two MNG at $3.420 into a post-report bounce, cover at $3.380. Four cents × $10 per cent per contract × 2 = +$80. Small money, identical lesson — which is the point while learning.
Example 3 — the winter tail. Long one NG through a January forecast flip that gaps gas from $4.20 to $4.95 over three sessions: +75 cents = +$7,500 on ~$4,000 margin. Now invert it, because the market can: the same gap against a short is a -$7,500 move that blows through the margin and leaves the account owing. Futures losses are not capped at your deposit. That single fact should size every winter position you ever take.
Reading a Natural Gas Quote
A quote board shows, for something like NGF27 (F = January, 2027 — gas uses the standard futures month codes): bid, ask, last, change versus the prior settlement, session high/low, volume, and open interest. Details that earn their keep:
- Change is measured from settlement, the exchange-calculated closing price from the prior afternoon window — not from the last overnight trade. Marks, margins, and ETF NAVs all key off settlement.
- The bid-ask spread is your entry toll. One tick ($10) in liquid NG months; frequently several ticks in QG and back months. Crossing a 3-tick spread on entry and exit is $60 of guaranteed slippage per round turn — budget it.
- Volume vs. open interest: volume is contracts traded today; open interest is positions outstanding. Front-month NG carries the bulk of both, and when open interest starts migrating to the next month, the roll is underway and so should yours be.
Price Limits and Circuit Breakers
CME applies dynamic price fluctuation limits to natural gas rather than the old fixed daily limits. When the front months move roughly 10% from the reference price, trading pauses briefly and limits expand in steps — the design goal is to slow panics, not cap them, and on the wildest days gas has moved 20%+ through successive expansions. The practical takeaways: a halt is not a ceiling, gaps through pause levels happen at the reopen, and resting stop orders provide no protection against opening gaps. Check the current limit mechanics on CME’s rulebook page rather than memorizing numbers; the exchange tunes them periodically.
Choosing Your Contract: An Honest Decision Tree
- Account under $10,000: Micros only. One MNG per $2,000–$3,000 of account is already assertive in winter. Anyone who tells you to trade full NG on a $5,000 account is selling something.
- Account $10,000–$50,000: Micros for positioning, possibly QG for quarter-size swing trades. Full NG only for brief, defined-risk trades — and only after a profitable season in Micros.
- Account $50,000+: NG becomes reasonable, sized so that a 30-cent adverse move (a bad-but-normal winter day, $3,000 per contract) costs no more than 1–2% of the account.
- Hedging physical exposure: match volumes — one NG per 10,000 MMBtu of monthly exposure — and use the physical-delivery contract if delivery optionality has value to you.
If you are still deciding whether futures are the right vehicle at all — versus options, ETFs, or energy equities — our comparison in how to start trading oil walks the same instrument choices for crude, and the logic maps one-to-one.
Putting the Specs to Work
Contract specifications sound like trivia until you watch them decide outcomes: the trader who didn’t know QG ticks in half-cents and wondered where his orders went; the position carried into settlement week that cost three ticks of spread to exit; the winter short whose loss didn’t stop at the account balance. Master the mechanics in this order — tick math, margin behavior, expiration calendar, roll execution — and only then graduate to strategy. When you are ready for that step, the pillar natural gas trading guide covers storage cycles, weather models, and seasonal strategy, and the hands-on futures walkthrough turns it into an executable process. The market rewards preparation unevenly, but it punishes ignorance of the mechanics with perfect consistency.
