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Reel Gear Ratio Calculator

By ·How these numbers are built·Last reviewed:

Work out how much line one turn of the handle actually retrieves, and whether that speed suits the technique you are fishing. Ratio alone does not answer this — spool diameter matters just as much.

How fast this reel actually retrieves
Per turn of handle
—
inches
Metric
—
cm
Turns for 100 ft
—
handle turns
At half spool
—
inches

What this means for your fishing

    Retrieve speed by reel size

    ReelRatioSpool (mm)In / turnCm / turn

    Gear ratio is only half the answer

    The gear ratio tells you how many times the spool turns per turn of the handle. What you actually care about is how much line that pulls in, and that depends on the second half of the equation: the circumference of the spool.

    Line retrieved per turn = gear ratio × spool circumference. Nothing else. This is why a 7.1:1 baitcaster can be slower than a 6.2:1 spinning reel — the baitcaster's spool is much smaller, so each rotation pulls in far less line.

    Rule of thumb: a full spool retrieves about 25% more line per turn than a half-empty one. The same reel, the same gear ratio, a different lure speed — simply because you cast further.

    What retrieve speed suits which technique

    These are the ranges experienced anglers converge on. They are not rules in a book — they are what makes each bait work.

    TechniqueTypical retrieveWhy
    Finesse
    drop shot, Ned rig
    18–24 in / turnYou want the bait to work without cranking at a crawl. A low ratio or small spool slows you down naturally.
    Crankbaits26–30 in / turnA moderate retrieve keeps the bait in its depth band and keeps it wobbling.
    Spinnerbaits28–34 in / turnThe blades do the work. Too slow and they stall.
    Jigs and plastics28–38 in / turnSpeed to cover water, plus enough torque to work the bait over structure.
    Topwater and buzzbaits38–48 in / turnFast. You want to move line quickly to trigger a reaction and keep a buzzbait on the surface.
    Inshore saltwater36–44 in / turnSpeed and torque to turn a running fish and to work against current.

    The two other numbers people confuse with ratio

    SpecWhat it meansWhat it does not tell you
    Gear ratio
    6.2:1
    Spool rotations per handle turnLine retrieved — a 4.0:1 on a big spool can beat a 7.1:1 on a small one
    Max drag
    15 lb
    Pulling force the drag can apply before it locksHow smoothly it releases — smoothness matters more than the headline figure
    IPT
    32 in/turn
    Inches of line retrieved per handle turnAnything about torque or cranking effort

    A reel's line capacity depends on spool geometry too — the Reel Line Capacity Calculator works that out, and the reel size chart shows how the common sizes differ.

    Reels at three retrieve speeds

    Pick the speed for the technique, then check that the max drag supports your line class.

    Spinning reel, 2500 size, mid ratio

    Around 5.3:1 on a 43 mm spool — roughly 28 inches per turn. The all-round freshwater speed.

    Check current price on Amazon →

    Baitcasting reel, 7.1:1

    About 31 inches per turn on a 35 mm spool. Fast enough for jigs and plastics, and the standard bass workhorse.

    Check current price on Amazon →

    Baitcasting reel, 5.4:1

    About 24 inches per turn. Deliberately slow, which is exactly what a deep crankbait wants.

    Check current price on Amazon →

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    Sources

    Full detail for every calculator is on the methodology page.

    Ratio is only half the story

    Two reels with the same gear ratio retrieve different amounts of line. The reel size chart explains what the size numbers mean, the line capacity calculator shows what fits the spool, and the best spinning reels under 100 guide puts it into buying terms.

    Common questions

    Is a higher gear ratio always faster?

    No, and this is the most common mistake in reel shopping. Retrieve speed depends on the ratio multiplied by the spool circumference. A 7.1:1 baitcaster on a 35 mm spool moves about 31 inches per turn; a 6.2:1 spinning reel on a 50 mm spool moves about 38 inches. The spinning reel is faster despite the lower ratio.

    What gear ratio do I want for bass fishing?

    For most freshwater work, a retrieve of roughly 28 to 34 inches per turn covers jigs, plastics, spinnerbaits and moderate crankbaits. That is a 6.2:1 to 7.1:1 baitcaster or a 5.2:1 to 6.2:1 spinning reel in the 2500 to 3000 size range.

    How many inches per turn should a crankbait reel retrieve?

    Around 26 to 30 inches. Faster than that and the bait climbs out of its depth band; slower and it stops wobbling. This is why crankbait anglers deliberately fish lower-ratio reels than their jig reels.

    Does line on the spool change the retrieve speed?

    Yes, by about 25% from full to half spool. A full spool has a larger effective diameter, so each turn retrieves more line. As you cast and the spool empties, the same reel gets slower — which is why a bait behaves differently at the end of a long cast than at the start.

    What is inches per turn (IPT)?

    Inches per turn is the industry term for how much line one full rotation of the handle retrieves. It is the number that matters for lure speed, and it is calculated from gear ratio and spool diameter together — never from the ratio alone.

    Related tools and guides

    Reel Line Capacity Calculator · Fishing reel size chart · Lure Weight Calculator · Crankbait diving depth chart · Best spinning reel under $100

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    Reference charts: Fishing Reel Size Chart

    Also worth reading: Baitcaster line capacity

    Please note: every figure on this page is an estimate, not a measured result. Tolerances between brands, wear on your gear and your own setup all change the outcome. TackleCalc has no connection to any brand mentioned here, and this content is for reference only.