Left Ventricular Mass Calculator
Enter end-diastolic echocardiographic dimensions to estimate left ventricular mass (LVM) using the Devereux corrected cube formula.
Formula used: LVM (g) = 0.8 × {1.04 × [(IVSd + LVIDd + PWTd)3 − (LVIDd)3]} + 0.6, with dimensions in cm.
What this left ventricular mass calculator does
This tool estimates the left ventricular mass (LVM) from standard echocardiography dimensions. LVM is an important structural marker in cardiology because increased LV mass can indicate left ventricular hypertrophy (LVH), which is associated with higher cardiovascular risk in many populations.
For better clinical interpretation, LVM is often indexed to body size as LVMI (g/m²) using body surface area (BSA). If you enter height and weight, the calculator will estimate BSA (Du Bois formula) and report LVMI automatically.
Measurements required
- IVSd: interventricular septal thickness in diastole
- LVIDd: LV internal diameter at end-diastole
- PWTd: posterior wall thickness in diastole
These values should come from technically adequate echocardiographic images and be measured using a consistent method in line with your lab protocol.
Reference interpretation (LVMI)
| Category | Male (g/m²) | Female (g/m²) |
|---|---|---|
| Normal | ≤ 115 | ≤ 95 |
| Mildly increased | 116–131 | 96–108 |
| Moderately increased | 132–148 | 109–121 |
| Severely increased | ≥ 149 | ≥ 122 |
Why relative wall thickness is included
The calculator also reports relative wall thickness (RWT):
RWT = 2 × PWTd / LVIDd
RWT helps describe LV geometry:
- Normal mass + normal RWT: normal geometry
- Normal mass + increased RWT (> 0.42): concentric remodeling
- Increased mass + increased RWT: concentric hypertrophy
- Increased mass + normal RWT: eccentric hypertrophy
How to use this calculator correctly
1) Confirm units
Select mm or cm before entering dimensions. The formula internally uses centimeters, and conversion is handled automatically.
2) Enter complete dimensions
All three echo dimensions are required. Missing or non-positive values will trigger an error.
3) Add body size if you need LVMI
Height and weight are optional, but both must be entered together if you want indexed mass.
4) Interpret in clinical context
Calculated values should be interpreted with symptoms, blood pressure status, valve disease, athletic conditioning, and imaging quality in mind.
Common pitfalls
- Mixing mm and cm without conversion
- Using poor-quality or off-axis echocardiographic views
- Comparing values across different measurement techniques without caution
- Treating one number as a diagnosis rather than part of a full assessment