Pre-roll cone sizes are written as two numbers: overall length in millimetres, then filter tip length in millimetres. An 84/26 cone is 84mm long with a 26mm tip. That second number matters more than most buyers expect, because the tip occupies space flower cannot, and because your filling machine's plate is bored for one specific tip diameter.
I've watched more small production runs stall on a cone-to-machine mismatch than on anything else, and it is always the same shape of mistake: cones ordered in bulk before anyone confirmed which plate the machine actually shipped with. This guide covers what each size holds, what the paired numbers mean, and how to choose a size you can still fill six months from now.
Pre-Roll Cone Size Chart
Capacity figures below are the practical fill, not the theoretical maximum. A cone packed until it will not draw is not a sellable unit, so the working number is always slightly under what the geometry allows.
Reading the Two Numbers
The first number is the full cone length before filling. The second is the filter tip, sometimes called the crutch. A 109/21 and a 109/26 are the same overall length, but the 26mm tip leaves 5mm less room for flower, so the 109/21 packs slightly heavier at the same density.
Tip length also changes how the unit smokes. A longer tip keeps the burning coal further from the lips and stays cooler through the last third of the joint, which is the part smokers complain about most. A shorter tip gives you more flower in the same footprint, which is why the 109/21 became the default one-gram cone across most of the market.
Neither is better in the abstract. They are not interchangeable on a filling machine, though, because the plate is bored for a specific tip diameter. A mismatched tip either jams during loading or sits loose enough to spill flower into the tray, and both failures cost you the cone and the material in it.
Matching Cone Size to Your Filling Machine
This is where first production runs go wrong. Cone filling machines are cut for one size at a time. The tray, the plate and the loading bay are all dimensioned around a specific cone length and tip diameter. Buying several thousand cones before confirming which plate you own is the most common and most expensive mistake in small-scale pre-roll production, and it is entirely avoidable.
Before ordering in volume, confirm three things: the plate size your machine shipped with, whether the manufacturer sells additional plates or cartridges for other sizes, and whether those parts are currently available. Machines across the cone filling machines range differ sharply here. Some are single-size by design and cannot be converted at all. Others accept a cartridge or adapter set that moves the same base unit between 84mm and 109mm in a few minutes.
If you expect to run more than one SKU, choose the machine around that requirement first and the cones second. In practice, converting a single-size machine after the fact is not possible, and the workaround people reach for, hand-filling the second size, undoes the throughput gain that justified buying a machine in the first place.
Paper Choice Within a Size
Once size is settled, paper is the next variable, and it is largely independent of capacity. The same 84/26 dimension is available in refined white, unrefined brown and organic hemp. Refined white burns most evenly and is the safest choice for consistency across a long production run. Unrefined brown is the common premium-shelf look and carries a slightly slower burn. Organic hemp appeals to a specific buyer and tends to run a touch faster.
Paper weight matters more as cones get longer. A 140mm cone in very thin paper is fragile during machine filling, and breakage during production is a real line-item cost at volume, not a rounding error. If you are running party or Fatboy sizes, weight the paper choice toward durability rather than appearance. You can compare the full range of pre-rolled cones by size and paper type to see what each brand offers in a given dimension.
Grind Consistency Changes Effective Capacity
The gram figures in the chart assume a proper grind at roughly 1 to 2mm. Grind finer and the same cone holds more weight but draws poorly, which produces complaints rather than repeat orders. Grind coarser and the cone reaches its physical limit before it reaches target weight, and the burn goes uneven and channels down one side.
This surprises people moving from hand-filling to machine production: your effective cone capacity is set by your grinder as much as by the cone. If fill weights drift across a run, I'd look at the grinder you chose and the grinder itself and the sifting stage before questioning the cone specification, because the cone dimension is fixed and the grind is not.
Running ground flower through a sifter screen before filling removes the stem fragments that puncture cones during packing. That waste exists at every size, and it gets worse as paper gets thinner, which is exactly when it is least visible in your numbers, since a punctured 140mm cone looks like a filling error rather than a material problem.
Cone Count Per Box and What It Costs You
Box counts are not standardised across sizes, and this quietly distorts cost comparisons. An 84mm box commonly holds 900 cones while a 98mm or 109mm box of the same brand holds 800, so a straight box-to-box price comparison overstates how much cheaper the smaller size is. Work in cost per cone, then add the flower cost at your target fill weight, and the picture changes again: an 84/26 unit at 0.6 grams uses roughly half the flower of a 109/21 at 1.1 grams, which usually dwarfs the difference in paper cost.
That is the calculation worth running before you settle on a format. The cone is rarely the expensive part of a pre-roll. Flower is, and cone size is what determines how much of it goes into every unit you sell.
Which Size Should You Run?
If you are launching a single SKU, 84/26 is the safest commercial choice. It is the most widely stocked size across brands, it suits multi-packs at an accessible price point, and nearly every filling machine on the market supports it without an adapter. Starting anywhere else narrows your options on both cones and equipment.
If you want a flagship one-gram unit, 109/21 is the standard, and it is what most buyers picture when they hear king size. If customers report tight draw, moving to 109/26 costs you a small amount of flower per unit and fixes the complaint.
Mini sizes at 78/20 make sense as part of a multi-pack strategy, where the format itself is the product and the low unit price drives trial. Party and Fatboy sizes are occasion products. They will not carry a core line, but they carry margin, and they are the easiest format to differentiate on when the shelf is crowded with king size units that all look alike.
Changing Size Later
Switching cone size after launch is more disruptive than it sounds, and it is worth knowing the cost before you commit. Packaging is sized to the cone, so tubes, tins and boxes all change with it. Compliance labelling carries the unit weight, which means new artwork and often a new approval cycle depending on your jurisdiction. Any remaining cone inventory in the old size becomes dead stock unless you keep the SKU alive alongside the new one.
The equipment side is the part that catches people out. If your machine takes adapter plates, the switch is a parts order and an afternoon. If it does not, you are buying a second machine to run the second size, which is a capital decision rather than an operational one. This is the strongest argument for choosing 84/26 or 109/21 at launch even if a niche size looks appealing: both are supported almost universally, so a later change stays a packaging problem instead of becoming an equipment problem.
Frequently Asked Questions
- What do the numbers in a cone size like 84/26 mean?
- The first number is the total cone length in millimetres and the second is the filter tip length in millimetres. An 84/26 cone is 84mm long with a 26mm tip, leaving 58mm of space for flower.
- How much flower fits in a king size cone?
- A 109mm king size cone holds roughly 1 to 1.15 grams at a proper grind. The 109/21, with its shorter tip, packs marginally heavier than the 109/26 at the same density.
- What is the most common pre-roll cone size?
- 84/26, known as 1 1/4. It is the dispensary default, holds 0.5 to 0.75 grams, and is supported by essentially every filling machine on the market.
- Can one filling machine handle multiple cone sizes?
- Only if the manufacturer sells plates, cartridges or adapter sets for the other sizes. Many machines are single-size by design and cannot be converted afterward, so confirm this before buying either the machine or the cones.
- What is the difference between 109/21 and 109/26?
- Both are 109mm long. The 109/21 has a 21mm tip and holds slightly more flower. The 109/26 has a 26mm tip, draws a little easier and stays cooler toward the end of the smoke.
- Does cone paper type affect capacity?
- Not meaningfully. Paper affects burn rate, appearance and durability during machine filling. Capacity is set by cone dimensions and grind consistency.
- Why are my fill weights inconsistent across a run?
- Usually grind consistency rather than the cones. Material that is too fine packs heavy and draws badly; too coarse and the cone fills before it hits target weight. Sifting between grinding and filling also removes the fragments that cause puncture waste.
