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Linear Actuator Calculator Suite — Free Engineering Tools for Force, Stroke & Motion Design
Sizing an actuator correctly is one of the most common engineering challenges in linear motion design. Whether you are working with electric, hydraulic, or pneumatic actuators, the underlying physics is the same — force, torque, geometry, and friction all interact to determine what actuator your application actually requires.
Most engineers and designers discover that the force rating printed on an actuator datasheet rarely tells the full story. A 100 lb-rated actuator cannot necessarily lift a 100 lb hatch, because the mounting angle, bracket geometry, and lever arm all multiply the required force. A scissor lift amplifies force through its pantograph linkage, while a panel mounted on a wall bracket creates torque demands that depend entirely on the bracket length and attachment angle. These are not intuitive calculations, and getting them wrong means an undersized actuator that stalls or an oversized one that wastes budget and space.
FIRGELLI's calculator suite solves this by giving you interactive physics simulators for every common actuator application. Each calculator uses real engineering equations — not simplified lookup tables — and provides real-time visual feedback so you can see exactly how changing a dimension, angle, or load affects the force your actuator must deliver. Every calculator also includes a built-in actuator selector that matches your calculated requirements against our full product catalog, scoring each actuator on force capacity and stroke fit so you can move from calculation to purchase in a single workflow.
These tools are used daily by mechanical engineers, industrial designers, automation integrators, robotics teams, and DIY builders working across industries including marine, automotive, agricultural, medical, furniture, home automation, solar tracking, and stage equipment. The calculators apply equally to electric linear actuators, hydraulic cylinders, pneumatic rams, and any other device that produces linear force — the physics does not change with the actuation method.
- Lid & Hatch Calculator — Calculates actuator force for hinged lids, trap doors, tonneau covers, cellar hatches, and marine hatches using torque equilibrium around the hinge point
- Panel Flip Calculator — Solves the linkage bracket problem for wall-mounted panels, drop-down TV lifts, solar trackers, and fold-out ramps where a short bracket arm creates force multiplication
- Scissor Lift Calculator — Models multi-stage pantograph mechanisms for lift tables, vehicle platforms, stage risers, and adjustable workstations with 1–10 scissor stages
- Linear Motion Calculator — Computes push/pull force on flat or inclined surfaces including friction, gravity components, and spring return loads for sliding doors, drawers, conveyors, and gate openers
- Simple Lever Calculators — First, second, and third class lever tools for quick moment-balance calculations on basic pivot mechanisms
- Built-in Actuator Matching — Every advanced calculator scores and ranks actuators from our catalog by force capacity and stroke length, eliminating manual cross-referencing
How the Calculators Work — Engineering Principles Behind Every Tool
Every calculator in this suite is built on classical mechanics — the same equations taught in university engineering courses and used in professional mechanical design. The lid and hatch calculator applies moment equilibrium around the hinge axis, resolving the actuator force vector into its perpendicular component and accounting for how that component changes continuously as the lid sweeps through its opening arc. This is why the required actuator force is always higher than the static weight of the lid, and why it varies with opening angle.
The panel flip calculator extends this analysis to bracket-mounted linkages, where the actuator connects to a short lever arm rather than directly to the moving panel. The mechanical disadvantage created by a short bracket means the actuator must produce significantly more force than a simple weight calculation would suggest. The calculator solves for the exact force at every angle using the bracket length, panel center of gravity, and the changing sine of the actuator-to-bracket angle.
The scissor lift calculator uses the geometric relationship between the horizontal actuator force and the vertical lift force in a pantograph mechanism. As the scissor angle decreases toward horizontal, the mechanical advantage drops and the required actuator force increases toward infinity — which is why scissor lifts require careful geometry planning. The calculator handles multiple stages and shows you exactly where your design sits on the force curve.
The linear motion calculator resolves forces along and perpendicular to the direction of travel, incorporating both the gravitational component on inclined surfaces and kinetic friction forces based on real material coefficients. It handles flat, inclined, and vertical orientations and optionally includes spring return forces.
All calculators display results through animated diagrams and a force gauge that updates in real time as you adjust parameters, giving you immediate visual confirmation that your design is within safe operating limits. A built-in safety factor slider lets you add engineering margin from 1.0x to 3.0x, following standard practice for actuator sizing where manufacturers recommend never running actuators continuously at more than 80% of their rated force.
