512Hz.net Audiogram Calculator - Complete Feature List
What This Tool Does
This is a free, professional audiogram calculator that allows healthcare professionals to create, edit, and export clinical-grade audiometry charts directly in their web browser. No installation, registration, or payment required.
Key Capabilities
- Interactive Plotting: Click anywhere on the audiogram chart to add hearing threshold points. Automatic snapping to standard frequencies (125, 250, 500, 1000, 2000, 4000, 6000, 8000 Hz) and 5 dB increments.
- Three Measurement Types: Air Conduction (AC), Bone Conduction (BC), and Masked Bone Conduction (mBC) all supported with standard symbols (O/X, </>, [/]).
- Automatic PTA Calculation: Pure Tone Average calculated in real-time using 500, 1000, 2000, and 4000 Hz thresholds for both ears.
- Visual Hearing Loss Zones: Toggle overlay showing Normal (0-15 dB), Slight (16-25 dB), Mild (26-40 dB), Moderate (41-55 dB), Moderately Severe (56-70 dB), Severe (71-90 dB), and Profound (91+ dB) classifications.
- Export Options: Download high-resolution PNG in A4 format with patient information, or print directly from browser.
- Keyboard Shortcuts: Ctrl+Z/Y for undo/redo, R/L to switch ears, A/B/M for AC/BC/mBC, Ctrl+G for zones, Ctrl+E to export.
- Dark/Light Themes: Toggle between professional dark theme and clean light theme with persistent preference.
- Privacy & Security: 100% client-side processing. No data transmitted to servers. Patient information never leaves the device.
- Mobile Responsive: Works on desktop, tablet, and mobile devices with touch-optimized interface.
How to Use (Step by Step)
- Enter Patient Information (Optional): Click "Show Patient Details" to add name, age, date, and diagnosis.
- Select Measurement Type: Choose Air Conduction (AC), Bone Conduction (BC), or Masked BC (mBC) from the tabs.
- Select Ear: Use the dropdown to choose Right or Left ear.
- Plot Thresholds:
- Method 1: Click directly on the chart at the desired frequency and threshold level.
- Method 2: Type values manually in the input table below the chart.
- Adjust Points: Drag existing points to new positions or right-click to delete.
- Review PTA: Pure Tone Average displays automatically on the right side.
- Export: Click "Export PNG" to download or "Print" to print directly.
Common Questions and Answers
What is an audiogram?
An audiogram is a graph that shows a person's hearing ability across different sound frequencies. The horizontal axis represents frequency (pitch) from 125 Hz to 8000 Hz, and the vertical axis represents hearing level in decibels (dB HL) from -10 to 120 dB.
What is Pure Tone Average (PTA)?
PTA is calculated by averaging hearing thresholds at four speech frequencies: 500 Hz, 1000 Hz, 2000 Hz, and 4000 Hz. Formula: PTA = (500 + 1000 + 2000 + 4000) ÷ 4. This number represents overall hearing sensitivity and is used for disability ratings and hearing aid candidacy.
What is the air-bone gap?
The air-bone gap is the difference between air conduction (AC) and bone conduction (BC) thresholds at the same frequency. A gap of 10 dB or more indicates conductive hearing loss. No gap suggests sensorineural hearing loss. Both elevated with a gap indicates mixed hearing loss.
When should I use masking?
Masking prevents cross-hearing when testing bone conduction or when there's a significant difference between ears. Always mask the non-test ear for bone conduction tests. Mask for air conduction when the difference between ears exceeds 40 dB (interaural attenuation).
What do the symbols mean?
- O (red circle) = Right ear air conduction, unmasked
- X (blue X) = Left ear air conduction, unmasked
- < (red arrow) = Right ear bone conduction, unmasked
- > (blue arrow) = Left ear bone conduction, unmasked
- [ (red bracket) = Right ear bone conduction, masked
- ] (blue bracket) = Left ear bone conduction, masked
Technical Specifications
- Frequency Range: 125 Hz to 8000 Hz (125, 250, 500, 1000, 2000, 4000, 6000, 8000 Hz)
- Threshold Range: 5 dB HL to 100 dB HL
- Step Size: 5 dB increments (automatic snapping)
- Export Format: PNG (300 DPI equivalent, A4 size)
- Browser Requirements: Modern browser with JavaScript enabled (Chrome, Firefox, Safari, Edge)
- Data Storage: Optional localStorage for auto-save (local only, never transmitted)
Privacy and Security
This calculator prioritizes privacy because all processing happens entirely in the browser using client-side JavaScript. No patient data is ever transmitted to external servers. Patient information stays 100% private on the user's device. We cannot access, store, or view any of your data.
Who Uses This Tool
- Clinical Audiologists: Quick reference audiograms, patient education materials, documentation for care teams
- Audiology Students: Practice interpretation, homework assignments, exam preparation
- ENT Physicians: Review pre-operative audiograms, track surgical outcomes, patient consultations
- Occupational Health: Hearing conservation programs, OSHA compliance, noise-induced threshold shift monitoring
- Hearing Aid Specialists: Baseline documentation, demonstrate hearing loss, support fitting decisions
- Researchers: Create example audiograms for publications, teaching materials, case studies
Comparison with Alternatives
| Feature | 512Hz.net | Manual Plotting | Desktop Software |
|---|---|---|---|
| Cost | Free | $0 | $500-2000 |
| Speed | 2 minutes | 5-10 minutes | 2-3 minutes |
| Installation | None | None | Required |
| Cloud Access | Yes | No | Some |
| Export | PNG, Print | Scan/Photo | PDF, EMR |