ECG Digital Caliper
Runs locally No data stored on server Free Not medically validated
For research / educational use only. Always confirm findings with calibrated clinical equipment.
Drag & Drop ECG Scan
or click to browse (JPG, PNG, PDF)
Adjust ECG paper corners
Drag the four pins to the actual paper corners. Then press Apply.
1. Calibration
2. Measurement Mode
Measure net QRS deflections on Lead I and Lead aVF to compute the Frontal QRS Axis.
1. Select Lead I or Lead aVF tool.
2. Drag vertically on the canvas starting at the baseline.
3. Drag UP for positive deflection, DOWN for negative.
4. Or type values manually.
Measure 5-10 consecutive R-R intervals with the caliper to analyze R-R variation and short-term HRV.
1. Set horizontal calibration in Step 1.
2. Click the Measure R-R Interval button below.
3. Measure 5-10 consecutive R-R intervals sequentially on the rhythm strip.
4. Review metrics in real-time.
Measure 5-10 consecutive P-P intervals with the caliper to analyze P-P coupling variation and sinus/atrial rate variability.
1. Set horizontal calibration in Step 1.
2. Click the Measure P-P Interval button below.
3. Measure consecutive P-P intervals sequentially on the rhythm strip.
4. Review metrics in real-time.
Measurement Results
Dr Yusuf Hoşoğlu · 2026
About · v0.6.0