Horizontal Scan Rate Calculator
Calculate critical display parameters for CRT monitors and other raster-based display systems
Display Resolution
Refresh Rate
Timing Parameters
Scan Rate Results
Enter your display parameters to calculate bandwidth requirements.
Detailed Timing Analysis
Your detailed timing analysis will appear here.
📊 Common Display Standards
| Standard | Resolution | Refresh Rate | Horizontal Scan Rate | Pixel Clock |
|---|---|---|---|---|
| VGA | 640×480 | 60Hz | 31.5 kHz | 25.175 MHz |
| SVGA | 800×600 | 60Hz | 37.9 kHz | 40 MHz |
| XGA | 1024×768 | 60Hz | 48.4 kHz | 65 MHz |
| 720p | 1280×720 | 60Hz | 45 kHz | 74.25 MHz |
| 1080p | 1920×1080 | 60Hz | 67.5 kHz | 148.5 MHz |
| 1440p | 2560×1440 | 60Hz | 88.8 kHz | 241.5 MHz |
| 4K UHD | 3840×2160 | 60Hz | 135 kHz | 594 MHz |
Note: These values represent standard timings and may vary slightly between implementations.
⚙️ Technical Considerations
CRT Limitations
Most consumer CRTs max out around 96kHz horizontal scan rate. Professional monitors may reach 130kHz.
Timing Precision
Accurate blanking intervals are critical for proper display synchronization and image stability.
Bandwidth Requirements
Higher resolutions and refresh rates require more video bandwidth and faster RAMDACs.
Cable Considerations
High scan rates may require high-quality cables to maintain signal integrity.
Interlaced vs Progressive
Interlaced video (like 480i) halves the vertical scan rate while maintaining the same line count.
Power Consumption
Higher horizontal scan rates increase power consumption in CRT displays.
Note: This calculator provides theoretical values based on standard video timing formulas. Actual display performance may vary based on specific hardware implementations and signal processing.