Hunting Arrow Trajectory Calculator: Rise, Drop, and Best Zero

Enter your arrow speed, choose the zero you actually use, set the vertical window you personally accept, and see your modeled rise, drop, and ranging margin before you set pins or build a sight tape.

In the Everyday Arrow System, this is Step 3: confirm that the arrow you built actually works for your hunting distances. Steps 1 and 2 help you choose a target arrow weight and see the speed, kinetic energy, and momentum it produces. This calculator takes the next step: it shows whether that real setup fits your sight plan and the way you hunt.

Most hunters know their arrow speed. Fewer know what that speed means once the arrow is in the air.

This Hunting Arrow Trajectory Calculator helps you see the part that matters: your arrow’s rise, drop, usable zero window, and the cost of a ranging mistake at the distances you care about. Start with a chronograph speed or estimate speed from your bow, then choose the zero and vertical window that fit your hunting style. The optional Advanced Arrow Profile refines the downrange estimate for the actual arrow you shoot.

What This Calculator Is—and What It Is Not

This is a planning tool. It gives you a useful model of your arrow’s path based on the numbers you enter. It is not a replacement for a chronograph, a properly tuned bow, broadhead practice, or verified sight marks.

Use it to narrow down a plan. Then shoot that plan. Paper tune, broadhead tune, confirm your zero, and verify your tape or pins at real distances before the season.

Why the Calculator Says “Mike’s Starting Point”

My normal close-range whitetail setup starts with a 20- to 25-yard zero and about ±4 inches of vertical room. Together, those settings are Mike’s Starting Point. I am looking for a setup where the arrow stays roughly four inches high or low of my line of sight for a useful stretch of close hunting distance.

It works well for the way I often hunt: deliberate shots from a treestand or saddle, usually at close range, where a simple hold can be valuable. The calculator labels that approach “Mike’s 20–25 yd / ±4 in starting point” because it is my field preset—not because it is the only good setup.

Start With Your Arrow Speed

Option 1: I have a chronograph speed

This is the best route when the arrow is already built. Enter the average from at least three shots with the finished hunting arrow—the shaft, insert, point or broadhead, nock, vanes, wrap, and every other part. Do not substitute an advertised IBO speed for a real chronograph number.

Option 2: Estimate speed from my bow

Use this when you are planning a new build or do not yet have a chronograph reading. The calculator uses the bow and finished-arrow details it asks for to create a working launch-speed estimate. That makes it useful for comparing possible arrow weights and seeing how a proposed build may behave before you finish it.

An estimated speed is a planning number, not a final sight-tape number. Once the arrow is built, chronograph it, update the calculator, and then verify your real pins or tape.

Use the Advanced Arrow Profile for a Better Downrange Estimate

The Advanced Arrow Profile is separate from how you enter speed. It is recommended because it adds the details that influence aerodynamic drag: shaft outside diameter, vane configuration, and point or broadhead profile. It uses those details to make the downrange-speed estimate better match the arrow you are actually shooting.

Arrow labels such as .166 and .204 usually describe inside diameter. Drag is affected by outside diameter, which can change by shaft model and spine. Choose a diameter class for a starting point, then enter the manufacturer’s exact outside diameter when you have it.

Without the Advanced Arrow Profile, the calculator uses one general hunting-arrow retention setting. With it, the path is still an estimate, but it is a better-matched estimate. Use the optional comparison speed to see how a second launch speed would change trajectory while keeping the same arrow, profile, sight height, and selected zero.

How to Use the Calculator

1. Choose your speed path. Enter a chronograph speed when you have one, or estimate speed from your bow when you are planning a build.
2. Use real input whenever you have it. A chronographed finished-arrow speed is better than advertised IBO speed or an estimate.
3. Add the Advanced Arrow Profile when you can. Enter the shaft outside diameter, vane setup, and point or broadhead profile for a better downrange estimate. Add a comparison speed if you want to see a second speed against the same setup.
4. Enter your finished arrow weight and sight height. Small details matter when you are mapping a path.
5. Choose your planning approach and real zero. Start with Mike’s 20–25 yard / ±4-inch plan if it fits your close-range hunting. Then select the 20- or 25-yard zero you actually use. If your system is built around 40 yards, use 40.
6. Choose your own vertical window. Mike’s ±4-inch window is part of my starting point for close hunting. You can select a larger window or enter a custom one.
7. Set the distance you want to study. For close hunting, 30 or 40 yards may be enough. For a TAC or 3D course, extend the view to 100 yards.
8. Read the result, then verify it. Use the chart and table to plan your sight. Confirm it by shooting real arrows at real distances.

How to Read Your Results

Your zero window

Your zero window is the distance span where the arrow stays inside the vertical limit you selected while you hold the same aiming reference. If the tool shows 5 to 29.9 yards, it means the modeled arrow stays inside your chosen window from 5 yards through 29.9 yards.

That does not mean you should take every shot in that window. It only tells you how much vertical forgiveness the setup provides. Wind, angle, animal position, brush, shooting form, and your own range limit still matter.

Maximum rise and drop

These tell you the highest point the arrow reaches above your line of sight and the lowest point it reaches below it within the distance you chose to analyze. They help you understand where a close shot might hit high and where a farther shot begins to need a precise pin or tape mark.

First distance outside your window

This is the first point where the arrow moves outside the vertical room you selected. It is an easy way to see when your simple point-blank hold stops being enough and your exact sight mark becomes more important.

Best-zero comparison

The calculator can compare available zeros using your speed, sight height, and vertical window. Think of this as a second opinion, not an order. Your chosen zero remains the plan. The comparison simply shows whether another zero would create a wider or more balanced window for the same inputs.

The Right Vertical Window Depends on How You Hunt

There is no one vertical window that fits every bowhunter. A hunter who wants a tight close-range point-blank setup may like a four-inch window. Another hunter may be comfortable with six, eight, or ten inches. A target archer shooting known distances with a precise tape may care more about exact marks than a point-blank window.

The important thing is to choose the window on purpose. Do not use a number just because it looks good on a screen. Use a number that works with your pin gaps, your broadhead group, the vital area you are protecting, and the distances you are truly willing to shoot.

How This Fits the Everyday Arrow System

Trajectory does not stand alone. It is the Step 3 check that connects the target weight from Step 1 and the performance numbers from Step 2 to your real sight plan. It tells you whether the complete setup is practical before you move on to component choices, FOC, and final dynamic-spine validation.

1. Find your target arrow weight. Start with the Everyday Arrow Weight Formula.
2. Check performance at that weight. Use the Arrow Performance Calculator to see speed, kinetic energy, and momentum together.
3. Confirm the path for your use. Use this calculator to check your selected zero, vertical window, rise, drop, and ranging-error margin.
4. Build the arrow accurately. Select components that hit your target weight, then measure the finished arrow.
5. Check FOC. Fine-tune balance without losing sight of the whole build.
6. Validate dynamic spine. Use the Dynamic Spine Calculator to confirm the finished arrow still matches your bow and point weight.

How to Use This Calculator for TAC Setup

Total Archery Challenge and other distance courses are a good reason to understand your trajectory beyond normal hunting distance. The calculator lets you study your arrow’s path out to 100 yards so you can prepare your sight tape, understand your pin gaps, and see how a small rangefinding mistake grows as targets get farther away.

Start with the zero you actually use

There is not one “TAC zero” that fits every bow or sight. A 40-yard zero can make sense for some fixed-pin and slider setups, but it is not a default recommendation. Start with the zero your sight is built around, then use the calculator to see the rise and drop that follow.

Use it to plan your sight tape and pin gaps

Enter your chronographed speed, finished arrow weight, and sight height. Then study the output at the marks you will use on the course: 20, 30, 40, 50, 60, 80, and 100 yards. This helps you catch a bad assumption before you build a tape or rely on a gap you have not confirmed.

Compare range-error cost before the event

On a long 3D target, being three or five yards wrong matters more than it does at 20 yards. The range-error table makes that tradeoff visible. Use it to decide where you need more careful ranging, where a known gap is acceptable, and where you need to slow down and verify the number.

Then shoot every important mark

The calculator is the planning step. It does not replace shooting your actual arrow through the sight you will carry. Confirm the final tape or pins at real distance, especially at the farther marks where a small speed difference, a loose sight, or an incorrect peep-to-sight measurement can show up.

None of this makes 100 yards a hunting recommendation. A course shot is a planned practice shot at a known target. A live-animal shot adds judgment, movement, angle, wind, and consequences. Keep those decisions separate.

A Quick Example

Say you shoot a 490-grain arrow at 250 fps and use a 25-yard zero. With Mike’s 20–25-yard / ±4-inch starting point, the calculator may show a close-range window that works well for the way I hunt. But a hunter with a 40-yard zero, fixed pins, or a larger acceptable window may get a more useful answer by changing the inputs.

That is the whole point. The tool should show you your plan—not force you into mine.

Bottom Line

A trajectory calculator should make your setup easier to understand, not tell you that one number fits everyone. Start with your actual arrow speed, use the zero you really run, choose the vertical room you are comfortable with, and see what the arrow does at the distances that matter.

Mike’s 20–25-yard / ±4-inch plan is my close-range starting point. Your best setup may be different—and this calculator is designed to show you the difference.

Important Notes

Trajectory results are estimates. Broadhead design, arrow drag, bow tune, air density, sight height, release execution, and rangefinding all affect real impact. Always verify your setup with the arrows and broadheads you will hunt with.

For a deeper look at the weight-and-speed tradeoff, read Heavy or Light Arrows? How to Choose the Right Hunting Arrow Weight and What Is the Best Arrow Speed for Hunting?.