What This Calculator Does
A deadzone is a chosen region of a controller stick's reported movement that software treats as zero. This calculator shows how two-dimensional X/Y input changes under three example deadzone models: scaled radial, scaled axial, and radial cutoff without rescaling. It also illustrates optional outer saturation, where full output is reached before the stick reports its maximum magnitude. The calculated response is not a measurement of any game's exact implementation.
Manual values work without a controller. If supported, the optional Gamepad API reader can populate raw X/Y values from a connected controller; it does not write anything back to the device.
How to Use This Calculator
- Choose Scaled radial for a circular magnitude-based model, Scaled axial to process each axis independently, or Radial cutoff for a simple zero-or-raw model.
- Enter raw X and Y stick readings from −1 to +1. You can use the sliders or copy sample values from the Analog Stick Deadzone Test.
- Set an inner deadzone (0–0.95). For scaled modes, optionally set an outer deadzone (0–0.50). The two must total less than 1. Outer deadzone has no effect in cutoff-only mode.
- Read Output X/Y, output magnitude and the stick status, then inspect the graph and comparison table. The cyan point is raw input; the green point is calculated output.
- Optionally connect a controller and interact with it, select its visible device and stick axes, then click Start Live Readings. Use Stop Live to restore your previous manual values. Axis mapping is not universal.
- Use Copy Summary or Download JSON to save the local calculation, or Reset to restore the example. The export never includes the controller ID.
How the Calculation Works
For a 2D stick, let r = √(X² + Y²), inner threshold d, and outer threshold o. In the scaled radial model, the new magnitude is zero when r ≤ d; otherwise it is clamp((min(r,1) − d) / (1 − d − o), 0, 1). That magnitude is multiplied by the original unit direction vector (X/r, Y/r). Direction is therefore preserved for a nonzero input.
In the scaled axial model, the same inner/outer rescaling is applied separately to the signed X and Y components. This can change diagonal direction and produce a final vector magnitude greater than 1, even though each component remains between −1 and 1.
In the radial cutoff model, both components are zero at or below the radial inner threshold. Outside it, the raw vector is returned without rescaling, with its magnitude capped at 1 to fit the circular model. The outer threshold is ignored. Real games may use additional anti-deadzone, sensitivity curves, axial clamps, smoothing or differently ordered transformations.
Understanding Your Result
| Result | What it means |
|---|---|
| Within deadzone | Selected model outputs zero for this sample; it does not prove the physical stick is stationary. |
| Active | At least one adjusted output component is nonzero and has not reached the selected scaled maximum. |
| Saturated | A scaled output component or radial magnitude has reached 1 due to the inner/outer thresholds. |
| Inner deadzone | The chosen zero-input threshold as a fraction of the relevant stick axis or radial magnitude. |
| Output magnitude | √(adjusted X² + adjusted Y²); independent axial outputs can exceed 1 on diagonals. |
For example, raw X = 0.35, raw Y = 0, inner threshold = 0.15 and outer threshold = 0 produce an output X of approximately 0.235 in scaled radial mode. Raw X = 0.60, raw Y = 0.80 has radial magnitude 1, even though neither axis reaches 1.
Benefits and Practical Uses
- See how a larger inner threshold reduces low-level stick motion in a chosen example model.
- Compare radial and per-axis calculations on a diagonal input, where they differ most.
- Check the theoretical effect of outer saturation, which can reach maximum output earlier.
- Inspect browser-reported X/Y readings from a compatible, user-connected gamepad without uploading controller identity.
- Save manual example settings for discussion or compare results from the separate live Gamepad Tester.
Common Mistakes to Avoid
- Assuming all games use scaled radial deadzones: implementations and ordering differ. This tool offers example formulas rather than reverse-engineering a game's setting.
- Using only a single idle sample to choose a threshold: stick drift and electrical noise fluctuate. Observe the largest repeated resting magnitude over time, then allow a reasonable margin; no universal value is guaranteed.
- Confusing axial and radial thresholds: X and Y may be below a per-axis threshold while the combined radial magnitude exceeds it.
- Expecting browser axis mappings to be universal: the typical left/right axis pairs are 0/1 and 2/3, but your controller may expose different ordering or no values at all.
- Treating a calculated output as measured physical performance: this page cannot determine potentiometer health, hardware calibration, aim-assist behavior or a game's applied deadzone.
Frequently Asked Questions
How do I find my controller's raw drift value?
Use the Analog Stick Deadzone Test or this page's optional live gamepad reader. Let the stick rest and observe the range of values over time. For a radial model, examine the maximum repeated √(X² + Y²), not just one axis or a single sample. Gamepad access and axis mapping vary by browser and controller.
Why does my output show 0 even though I entered a nonzero raw value?
The selected model treats a small raw input as inside its deadzone. Scaled radial and cutoff modes compare the combined X/Y magnitude with the inner threshold; scaled axial mode checks each component individually. The zero result is a calculation, not proof that the stick hardware stopped moving.
Should I set the same deadzone on both sticks?
Not necessarily. Left and right sticks can have different idle noise and drift. Test each stick independently, consider your game's own deadzone model and choose the smallest stable setting that suits your usage. This calculator cannot change the actual game's settings.
Why Deadzones Exist and How They Affect Precision
Analog sticks may show small nonzero readings at rest because of mechanical wear, sensor noise, imperfect centering or software calibration. A deadzone can suppress those readings, but an excessive threshold also suppresses intentional fine movement. A scaled deadzone reallocates the remaining travel to reach the maximum output; cutoff-only logic simply ignores a central region and leaves the outer readings unaltered. Those approaches feel different, especially near the edge of the threshold and while aiming diagonally.
Gamepad readings are generally normalized to roughly −1 through +1 per axis. Depending on browser privacy restrictions, permissions policy, controller mapping and which document has focus, live gamepad input may not be visible. On some browsers you must press a controller button or move a stick before the device appears. Multi-Controller Tester can help compare available devices.
Conclusion
Use the model comparison to understand how input magnitude, inner deadzone and outer saturation interact. A small stable threshold may improve fine control, but the ideal setting depends on the actual controller and game. For a practical starting point, measure resting stick noise with the Analog Stick Deadzone Test, then use this calculator to explore the possible output of your desired deadzone model.