Gas Strut Force Calculator
Calculate the exact lifting force (Newtons) and estimate the stroke length needed for your hatches, lids, tailgates, and boxes. Ensure safe and smooth operation every time.
Hatch & Lid Dimensions
Enter the physical properties of your lid and strut mounting points
The total mass of the panel, lid, or hatch you are lifting.
Measured from the hinge pivot point to the opposite edge.
Where the bottom of the gas strut attaches to the lid (measured from the hinge).
The angle between the gas strut and the lid when the lid is fully closed (typically 10°–20°).
Your Gas Strut Requirements
Force rating, estimated length, and setup details
Enter your hatch dimensions and mounting details above, then click Calculate Required Force to find the perfect gas strut.
Common Gas Strut Force Ratings
Not sure if your calculated force matches standard off-the-shelf struts? Use this guide to see typical applications for various Newton (N) ratings.
| Force Rating | Approx. Push Force | Typical Applications |
|---|---|---|
| 050N – 100N | 5kg – 10kg | Light toy boxes, small cabinet doors, lightweight RV compartments |
| 150N – 250N | 15kg – 25kg | Car boots (trunks), boat hatches, standard bed storage lifts |
| 300N – 400N | 30kg – 40kg | Heavy truck hoods, large fiberglass RV compartments, heavy toolboxes |
| 500N – 600N | 50kg – 60kg | Industrial machinery covers, heavy steel access panels, large tailgates |
| 800N+ | 80kg+ | Heavy industrial applications, agricultural equipment, security hatches |
Gas Strut FAQ
Everything you need to know about sizing, installing, and understanding gas springs for your DIY or automotive projects.
Gas strut force is calculated using the torque equation. The force required (in Newtons) depends on the weight of the lid, the distance from the hinge to the center of gravity, the distance from the hinge to the strut mount, the number of struts used, and the angle of the strut relative to the lid when closed. A 10% safety margin is typically added to ensure smooth operation.
Newtons (N) are the metric unit of force. 10 Newtons is roughly equivalent to 1 kilogram of push force. For example, a 500N gas strut can push with a force of approximately 50kg. This rating indicates how much lifting power the strut provides.
For narrow or lightweight lids (under 60cm wide), a single centrally mounted strut is usually sufficient. For wider, heavier, or asymmetrical hatches (like car boots, RV compartments, or large toy boxes), two struts are recommended to provide balanced lifting force and prevent the lid from twisting or binding on the hinges.
It is not recommended to significantly exceed the calculated force. If the struts are too strong, the lid will be difficult to close manually and may slam shut violently, posing a safety hazard or damaging the hinges. It is best to stay within 10-20% of the calculated requirement.
To measure for a replacement, you need two key dimensions: the ‘Extended Length’ (measured from the center of one mounting ball socket to the center of the other when fully stretched) and the ‘Stroke Length’ (the length of the exposed shiny inner shaft). You should also check the force rating printed on the old strut’s body (e.g., 0450N).