Preflop RFI Ranges: The First-In Opening Guide

RFI stands for Raise First In — the range of hands you open-raise when the action folds to you and nobody has entered the pot. It’s the most frequently used range in all of poker, because “everyone folds to me” is the most common preflop situation you’ll face. This guide gives you position-by-position RFI ranges and explains the logic that widens them as you move toward the button.

What RFI actually means

The acronym decodes cleanly:

• Raise — when you enter, you enter with a raise, not a limp. Open-limping is a strategic mistake in almost every modern setup.
• First In — no one before you has put money in voluntarily. The blinds are posted, but they’re forced, so the pot is still “unopened.”

So an RFI range is your open-raising range from a given seat in an unopened pot. It’s identical to what many charts call an “opening range” — RFI is just the more precise term. For the broader treatment, see preflop opening ranges.

Why RFI is the range that matters most

Every hand where the action folds to you, you make an RFI decision. That’s a huge share of your total preflop choices. Nail your RFI ranges and you’ve fixed the biggest, most repeated decision in your game before more complex spots ever come up.

Get RFI wrong — open too wide from early seats, too tight from late ones — and the error compounds thousands of times, bleeding chips in a way no single flashy play can fix.

RFI ranges by position (6-max, 100bb)

Here’s a solid 6-max baseline. Percentages are the share of the 169 starting-hand types you open:

Position	RFI %	Range shape
Under the gun (UTG)	~15%	2-2+, A-J suited+, A-Q offsuit+, K-Q suited, suited broadways
Lojack / middle	~18%	Adds A-10s, K-J suited, Q-J suited, more suited connectors
Cutoff	~26%	Adds most suited aces, K-10s, small pairs, 8-7s down to 5-4s
Button	~45%	Any pair, most suited hands, many offsuit broadways and aces
Small blind	~40%	Wide but 3-bet-heavy; only the big blind acts behind

The through-line: the later you sit, the wider you open. Under the gun has five players behind who could hold a monster, so you stay tight. The button has only the two blinds behind, so it opens nearly half its hands.

The logic behind widening ranges

Two forces pull RFI ranges wider as you approach the button:

• Fewer players behind. Each seat closer to the button means fewer opponents who can wake up with a strong hand and 3-bet or call you. Less risk of running into a big hand lets you open lighter.
• Position on future streets. From late position you’ll usually act last postflop, which is a huge edge. Hands that would be marginal out of position become profitable opens when you’ll have position after the flop.

Together these mean the button can profitably open hands like K7s or T8o that would be clear folds under the gun.

Combo math inside an RFI range

Understanding why a range is “15 percent” helps you build it from memory. The 169 starting-hand types break into 1,326 total combinations:

• 13 pocket pairs, 6 combos each = 78 combos.
• 78 suited hands, 4 combos each = 312 combos.
• 78 offsuit hands, 12 combos each = 936 combos.

A 15 percent UTG range is about 200 combos. Because offsuit hands carry 12 combos apiece, cutting offsuit junk trims the range fast, while adding a suited hand (only 4 combos) barely widens it. That’s why tight ranges lean suited: suited hands give you playability at a low combinatorial cost.

RFI vs facing action

RFI has one strict condition: the pot must be unopened. Two situations end it:

• Someone limps. You’re no longer first in. Now you raise to isolate the limper with a tighter, more value-heavy range — see isolating limpers.
• Someone raises. Now you’re facing an open, and your decision is 3-bet, call, or fold — a different set of ranges entirely.

Confusing these is a classic error. An RFI chart tells you nothing about how to react to a raise; it only covers the “folded to me” case.

A worked RFI decision

You’re in the cutoff with A♠ 9♠, and the action folds to you. Two players remain behind: the button and the small blind (plus the big blind).

• A-9 suited sits comfortably inside a ~26 percent cutoff range. It’s a suited ace with flush and straight potential.
• Raise to about 2.5bb. You’re first in, in late position, with a hand that plays well and has fold equity against the blinds.

Now slide that same A♠ 9♠ to under the gun. In a ~15 percent range it’s a fold — five players act behind you, and a suited but weak ace like this doesn’t clear the bar that early. Same two cards, different seat, opposite decision. That’s an RFI chart doing its job.

Common RFI mistakes

• Open-limping. If a hand is worth playing, raise it; if it isn’t, fold. Limping first in surrenders initiative.
• One range for all seats. Position is the master dial — early tight, late wide.
• Ignoring stack depth. These ranges assume 100bb. Short-stacked, you tighten and shift toward raise-or-fold.
• Applying RFI when facing a limp or raise. RFI is for unopened pots only.

Wrapping up

RFI — Raise First In — is your open-raising range in an unopened pot, and it’s the highest-frequency decision in poker. Keep early positions tight and late positions wide, lean on suited hands to stretch tight ranges cheaply, and remember RFI ends the instant someone acts in front of you. Build it out with poker ranges by position and the positions hub, then tie it into the full preflop strategy framework.