Free motocross jump calculator

Stop guessing.
Build it right.

Real physics, real construction specs. Know exactly where you'll land — and how hard — before a single shovel hits the dirt.

Open the calculator ↓ How it works
4
Jump types
4
Stakes placed
$0
Always free
Support this tool
⚡
Live trajectory
The arc updates instantly as you move any slider — and the landing point is calculated against the actual sloped landing surface, not a flat line.
📐
Stake placement
Four numbered stakes drawn right on the diagram with exact ground distances from the jump toe — ready to mark on site with a tape measure.
💥
Impact rating
Every setup shows its equivalent flat drop — how hard the landing actually hits. A well-matched downslope can turn a 9 ft drop into a 2 ft one.
🚚
Dirt volume
Cubic yards and truck-load estimates for your exact dimensions, so you order the right amount of dirt before you start moving it.
Jump calculator

Design your jump

Adjust the sliders — the profile, trajectory, and every spec update instantly. Hit Test ride to watch the jump at your speed.

Profile view · live trajectory
—
Takeoff
3 ft
Beginner 1–3 ft · Intermediate 3–6 ft · Advanced 6–10 ft
18° — 3.1:1
Beginner 10–16° · Intermediate 16–22° · Advanced 22–30°
Gap & landing
20 ft
Beginner 5–20 ft · Intermediate 20–40 ft · Pro 40–70 ft
0 ft
Negative = lower landing · positive = higher landing
18° — 3.1:1
Match or run slightly shallower than takeoff for soft landings
Rider & build width
25 mph
Backyard 10–35 mph · Track 35–55 mph
20 ft
Used for the dirt volume estimate only
Peak height
—
ft above lip
Distance flown
—
ft from lip
Air time
—
seconds
Landing impact
—
equivalent flat drop
Speed safety window
Takeoff
—
yd³
Landing
—
yd³
Total dirt
—
yd³
Saved jumps
How it works

From slider to shovel

1
Set your jump shape
Choose double, tabletop, step-up, or step-down. Dial in lip height, takeoff slope, gap distance, and landing slope. The profile redraws in real time, drawn to true scale.
2
Verify the trajectory
The orange arc shows exactly where a rider travels at your speed, and the crosshair marks the true impact point on the landing surface. Hit Test ride to watch it happen.
3
Check speed and impact
The gauge shows the speed window where the rider clears the knuckle but stays on the downslope. The impact rating tells you how hard the landing hits — like dropping flat from that many feet.
4
Print and build
Print the spec sheet — a full construction document with the profile diagram, stake placements, slopes, dirt volumes, and the safe speed range. Take it to the site.
Safety

Built-in safety checks

Every output is designed to help you make better decisions before any dirt moves.

📏
No kickers
The calculator enforces a straight, consistent slope from toe to lip. An abrupt angle change at the top — a kicker — is one of the leading causes of crashes on poorly built jumps.
💥
Impact rating
Landing on a matched downslope absorbs most of the fall. The equivalent-flat-drop number shows how hard each landing really is, so you can shape the landing before anyone tests it.
⚡
Safe speed window
Every jump shape has a speed range — enough to clear the knuckle, not so much that you overshoot the toe. The gauge shows exactly what this jump was designed for.
⚠️
Always verify on site
This tool assumes flat ground and clean projectile physics — no wind, no drag, no suspension. Real terrain, soil, and technique all matter. Verify on site and always roll it slow first.

Ready to build your jump?

Free, no account needed, works in any browser or on your phone.

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