Broadhead Weight Calculator

Example recommendation

Let's find the right broadhead for a typical elk hunter:

Since you practice with 125 grain field points, hunt with 125 grain broadheads. For elk, consider upgrading to 150 grains for better penetration - but practice with 150 grain field points first.

Understanding broadhead weight

Why broadhead weight matters

Broadhead weight affects three critical factors:

• Total arrow weight: Directly adds to total arrow weight, affecting kinetic energy and momentum
• FOC (Front of Center): Heavy broadheads improve arrow balance and penetration
• Arrow tuning: Must match practice field point weight for arrows to fly the same

The golden rule: Practice with the same weight field points you'll hunt with. If your arrows are tuned perfectly with 125 grain field points, they'll fly perfectly with 125 grain broadheads. Switch to 150 grain broadheads without practicing, and your arrows may fly differently - potentially causing misses or wounded game.

Standard broadhead weights

Broadheads are manufactured in standardized weights:

• 100 grains: Most common, especially for compound bows. Standard for deer hunting.
• 125 grains: Popular for larger deer and elk. Good balance of weight and speed.
• 150 grains: Heavy broadheads for elk, moose, bear. Maximizes penetration.
• 175-200 grains: Very heavy, used for dangerous game and extreme penetration setups.

Less common weights (75, 85, 145 grains) exist but limit your broadhead selection. Stick to standard weights (100, 125, 150) for best availability and selection.

Fixed-blade vs. mechanical weight

Both fixed-blade and mechanical broadheads come in the same weight ranges (100-150 grains typically). Weight doesn't determine which type you should use:

• Fixed-blade: More reliable, better penetration, works at any speed. Requires perfect tuning.
• Mechanical: Larger cutting diameter, easier to tune, less wind-planing. Needs more speed (280+ FPS).

Choose broadhead type based on your bow setup and preferences, not weight. Both types perform well in 100-150 grain ranges.

Broadhead weight recommendations by game

Whitetail and mule deer

For deer, 100-125 grain broadheads are standard. Both weights work excellently with proper shot placement. Choose based on what field point weight you currently practice with.

Elk and large game

Elk require heavy broadheads for deep penetration through thick hide, muscle, and bone. Most experienced elk hunters use 125-150 grain broadheads. Very heavy setups (150-200 grains) are popular for close-range, high-angle shots where maximum penetration is critical.

Brown bear, moose, and dangerous game

For the largest and toughest North American game, use 150-200+ grain broadheads. These animals require maximum penetration. Many guides require clients to use minimum 150 grain broadheads combined with total arrow weights of 600-750+ grains.

Single-bevel, cut-on-contact fixed-blade broadheads in 150-200 grain weights are the gold standard for dangerous game. Mechanical broadheads are not recommended - fixed-blade reliability is essential.

Matching field points to broadheads

Why exact weight matching matters

Your arrows are tuned based on total weight, balance point, and aerodynamics. When you practice with field points, your arrows learn to fly perfectly from YOUR bow with YOUR form. Switch to broadheads of different weight, and:

• Arrow spine effectively changes (heavier = stiffer needed)
• FOC shifts, changing arrow flight characteristics
• Arrow speed changes slightly, affecting trajectory
• Impact point shifts (often 2-6 inches at 40 yards)

The solution: Practice with field points matching your hunting broadhead weight. Your arrows will impact the same spot in practice and hunting. Zero surprises when it matters most.

The tuning process

1. Choose broadhead weight based on target game (100-125 for deer, 125-150 for elk)
2. Buy matching field points in the same weight
3. Tune your bow using these field points until arrows fly perfectly
4. Verify broadhead flight by shooting a few broadhead-tipped arrows at close range (10-15 yards)
5. Practice primarily with field points (they're cheaper), shooting broadheads occasionally to verify

What if I want to increase broadhead weight?

If you currently practice with 100 grain field points but want to hunt elk with 150 grain broadheads:

1. Buy 150 grain practice field points
2. Shoot them to verify arrow flight (may need stiffer spine)
3. Adjust bow sight for new impact point
4. Practice extensively with 150 grain field points
5. Only after achieving consistent accuracy, buy 150 grain broadheads

Never just screw on heavier broadheads without practicing with matching field points first. This is a recipe for wounded animals and lost game.

🛒 Shop matching field points and broadheads in the same weights on Amazon.

Broadhead weight, FOC, and penetration

How broadhead weight affects FOC

Broadhead weight directly impacts your arrow's FOC (Front of Center balance). Heavier broadheads shift the balance point forward:

• +25 grains (100 to 125): Increases FOC by approximately 1-2%
• +50 grains (100 to 150): Increases FOC by approximately 2-3%
• +100 grains (100 to 200): Increases FOC by approximately 4-5%

Higher FOC improves penetration because the arrow is more nose-heavy, driving the broadhead deeper through tissue and bone. For hunting, aim for 10-15% FOC for deer, or 15-20% FOC for elk and larger game. Use our FOC calculator to check your setup.

The penetration equation

Penetration depends on three factors working together:

• Kinetic energy (ft-lbs): Total energy available - use our kinetic energy calculator
• Momentum (slug-ft/s): Ability to maintain forward motion - use our penetration calculator
• FOC percentage: Arrow balance that keeps driving forward - use our FOC calculator

Heavier broadheads improve all three metrics. They add total arrow weight (increasing kinetic energy and momentum) and shift weight forward (increasing FOC). This is why experienced elk hunters prefer 125-150 grain broadheads over 100 grain options.

Diminishing returns

While heavier is generally better for penetration, there are trade-offs:

• Speed loss: Each 25 grains added reduces arrow speed by ~5-8 FPS
• Trajectory: Heavier arrows drop faster at distance
• Wind drift: Actually improves with heavier arrows due to higher momentum

For most hunters, 125 grain broadheads hit the sweet spot. They're heavy enough for excellent penetration but not so heavy that trajectory becomes problematic at typical hunting distances (20-50 yards).