How to Select the Right Arrow Weight for Your Bow

The right arrow weight is the finished weight of the complete arrow, including the shaft, insert, nock, vanes, wrap, and point or broadhead. For most bow setups, the safest starting point is not the fastest arrow. Start with the bow manufacturer’s minimum arrow-weight rule, then choose a finished arrow that matches your draw weight, draw length, arrow spine, point weight, and purpose.

If you only remember one rule, remember this: never shoot an arrow that is too light for your bow. A very light arrow can transfer too much energy back into the bow, which may damage equipment and create a safety risk. When in doubt, use your bow manual, the arrow maker’s selection chart, and a qualified archery shop before buying or cutting arrows.

Quick Answer

To select the right arrow weight for your bow, first find the bow manufacturer’s minimum finished-arrow weight. Then choose an arrow shaft with the correct spine for your draw weight, draw length, arrow length, and point weight. Target shooters often prefer a flatter, lighter setup within safe limits, while bowhunters often choose a heavier arrow for quieter shooting, stability, and better energy transfer.

Arrow weight and arrow spine are connected. A heavy point, longer shaft, or higher draw weight usually requires a stiffer shaft. A short arrow, lighter point, or lower draw weight may need a weaker spine. Use the arrow manufacturer’s chart as the final selection tool because each shaft line is built differently.

What Arrow Weight Means

Arrow weight is measured in grains. One finished arrow is the total of every part: shaft, insert, point or broadhead, nock, fletching, wrap, lighted nock if used, and any collar or outsert. The shaft is often listed in grains per inch, usually written as GPI. That number only tells you the bare shaft weight per inch, not the final arrow weight.

For example, a 29-inch shaft rated at 8.5 GPI weighs 246.5 grains before you add the insert, point, nock, vanes, and other parts. Once everything is installed, that same arrow may finish around 390 to 450 grains depending on the components. That finished number is the one your bow cares about.

Grains Per Pound: The Safety Starting Point

Grains per pound, often shortened to GPP, compares finished arrow weight to bow draw weight. A 350-grain arrow from a 70-pound compound bow equals 5 grains per pound. Many compound bow discussions use 5 GPP as a common minimum safety reference, but your specific bow manual is the rule that matters most.

The reason is simple: the arrow absorbs energy from the bow. If the arrow is too light, more energy stays in the bow system. That can be hard on limbs, cams, strings, cables, and accessories. The compound bow reference overview also explains why arrow stiffness and minimum weight matter with modern compound bows.

Arrow Spine Matters As Much As Weight

Arrow spine is the stiffness of the shaft. It is not the same as arrow weight, but it changes how the arrow behaves when the bow launches it. A shaft that is too weak can flex too much. A shaft that is too stiff can also tune poorly. Either way, groups may open up and broadheads may be harder to control.

The arrow reference page gives a useful overview of shaft parts and spine. In practical terms, your arrow selection should account for draw weight, draw length, arrow length, point weight, and the bow type. For a deeper local guide, see our article on choosing an arrow to match your bow.

Target Arrows vs Hunting Arrows

Target Arrow Weight

Target shooters often care about repeatable groups, forgiving tune, and a trajectory that fits the distance. A lighter safe arrow can be faster and flatter, which may help on known-distance targets. But a target arrow still needs to meet the bow’s minimum weight and match the correct spine. Fast is not useful if the arrow is unsafe or hard to tune.

Hunting Arrow Weight

Bowhunters often choose a moderate to heavier finished arrow because it can be quieter, carry momentum well, and stabilize broadheads better. Heavier does not automatically mean better, though. A hunting arrow still has to fly cleanly from your bow, hit where you aim, and stay within a setup you can practice confidently.

How To Calculate Finished Arrow Weight

Use this basic formula: shaft length multiplied by GPI, plus the weight of every installed component. Count the insert, point, nock, vanes, wrap, collar, outsert, and any lighted nock. Do not guess if safety is involved. Use a grain scale after assembly, because glue, wraps, collars, and manufacturing variation can change the final number.

Example: a 28.5-inch shaft at 9.0 GPI weighs 256.5 grains. Add a 50-grain insert, 100-grain point, 12-grain nock, 21 grains of vanes, and a 7-grain wrap, and the finished arrow is about 446.5 grains. If that arrow is shot from a 60-pound bow, it is about 7.4 GPP.

Draw Weight, Draw Length, And Arrow Length

Draw weight is one of the biggest factors in arrow selection. Higher draw weight generally needs a stiffer arrow. Draw length matters because it affects how much energy the bow stores and often affects the arrow length you can safely shoot. Longer arrows act weaker than shorter arrows of the same spine, so cutting an arrow shorter usually makes it behave stiffer.

Do not cut arrows only to chase speed or a lighter finished weight. The arrow must be long enough for your setup, rest position, broadhead clearance, and safe shooting form. If you are still dialing in draw weight, read our guide on how to choose compound bow draw weight before finalizing arrows.

Point Weight And Broadhead Changes

Changing point weight changes both finished weight and dynamic spine. A heavier point makes the arrow heavier and can make the shaft act weaker during the shot. A lighter point does the opposite. This is why switching from a 100-grain field point to a heavier broadhead should not be treated as a small detail.

If you hunt, tune with the actual broadhead weight you plan to use. Your broadheads, field points, and arrows should match in weight closely enough that practice results transfer to the hunting setup. Never assume a broadhead will hit with field points until you test it safely on a suitable target.

Testing And Tuning Your Setup

Paper Tuning

Paper tuning can show whether the arrow is leaving the bow cleanly. A poor tear can come from spine mismatch, rest position, nock height, grip torque, cam timing, or form. Use paper tuning as a clue, not as the only decision.

Group Testing

Once the setup is safe, shoot groups at realistic distances. Compare consistency, noise, sight marks, and broadhead control. The best arrow is the one that is safe, repeatable, and suited to your purpose, not just the one with the fastest speed number.

Common Arrow Weight Mistakes

Going Too Light

This is the biggest safety problem. A lightweight arrow may look attractive because it is fast, but it can be hard on the bow if it falls below the manufacturer’s minimum. Always check finished weight, not just shaft weight.

Ignoring Spine

Two arrows can finish at similar weights but behave differently because their spine, length, and point weight differ. Weight alone does not prove the arrow matches your bow.

Copying Someone Else’s Setup

A friend’s arrow may be perfect for their draw length, draw weight, rest, point weight, and purpose. That does not make it right for your bow. Use their setup as a conversation starter, not a shopping list.

Not Weighing The Finished Arrow

Online specs are helpful, but a grain scale gives the final truth. Weigh at least a few finished arrows from the dozen and keep the set consistent. Big differences inside one set can show up downrange.

Arrow Weight Checklist

• Confirm your bow’s draw weight and draw length.
• Find the manufacturer’s minimum finished-arrow weight.
• Choose a shaft spine from the arrow maker’s chart.
• Include point or broadhead weight in the calculation.
• Weigh the finished arrow on a grain scale.
• Check safe arrow length and broadhead clearance.
• Tune the bow and test groups before hunting or competition.

FAQ

What is the best arrow weight for a compound bow?

There is no single best number. The right finished arrow weight depends on your bow’s minimum requirement, draw weight, draw length, arrow spine, point weight, and whether you are shooting targets or hunting.

Are heavier arrows more accurate?

Not automatically. Heavier arrows can be quieter and more stable in some setups, but accuracy comes from a safe spine match, clean tune, consistent form, and a repeatable arrow build.

Is GPI the same as finished arrow weight?

No. GPI is shaft weight per inch. Finished arrow weight includes the shaft plus insert, point, nock, vanes, wrap, collars, and any other installed components.

Can I change broadhead weight without changing arrows?

Sometimes, but you must retune and verify. A heavier broadhead changes finished weight and dynamic spine, and it can change point of impact.

Final Takeaway

Choose arrow weight by safety first, then tune and purpose. Start with your bow’s minimum finished-arrow weight, pick a shaft spine that matches your setup, calculate every component, and confirm the final arrow on a grain scale. A good arrow is not just fast or heavy; it is safe, correctly spined, consistent, and proven on your own bow.