LVMI Calculator 2.7
Echo measurements + height in meters for 2.7-exponent indexing
LVM and LVMI indexed to height²·⁷ with LVH threshold comparison
Real-time Echocardiographic Geometry Visualizer
How LVMI Calculator 2.7 Works
LVMI Calculator 2.7 works by computing LVM using the Devereux formula, then dividing LVM by height raised to the 2.7 power instead of BSA, producing LVMI in g/m²·⁷.
Clinical Role: Measures the thickness of the muscular wall separating the left and right ventricles at end-diastole.
Normal Range: 6 – 10 mm (Female) | 6 – 10 mm (Male).
Hypertrophy Impact: Values > 11 mm indicate septal thickening, commonly triggered by arterial hypertension or aortic stenosis pressure overload.
The "2.7" refers to an allometric scaling exponent validated by de Simone et al. (1992). Height-based indexing with the 2.7 exponent reduces the masking effect of obesity on LVH detection — obese patients with truly hypertrophied hearts are correctly identified, whereas BSA-indexing may underestimate their LVMI.
LVMI Calculator 2.7 LVH thresholds: ≥ 51 g/m²·⁷ for men, ≥ 47 g/m²·⁷ for women (de Simone et al., 1992; Chirinos et al., 2010).
LVMI Calculator 2.7 Formula
The LVMI Calculator 2.7 formula computes LVM with the Devereux equation, then indexes to height²·⁷.
Derived by Dr. Richard B. Devereux using regression analysis comparing echocardiographic linear measurements against actual post-mortem heart weights.
The 0.8 factor corrects for overestimation inherent in assuming the left ventricle is a perfect prolate ellipsoid shape.
LVM (g) = 0.8 × { 1.04 × [(IVSd + LVIDd + PWd)³ − LVIDd³] } + 0.6 LVMI₂.₇ (g/m²·⁷) = LVM (g) ÷ Height (m)²·⁷ Height must be in meters (m). For 170 cm: 1.70²·⁷ ≈ 3.93 m²·⁷.
LVMI Calculator 2.7 Conversions Chart
The LVMI Calculator 2.7 conversions chart compares LVH thresholds for height²·⁷ and BSA indexing methods.
Healthy heart dimensions with normal mass and balanced wall thickness.
Thickened heart wall relative to cavity size, but total cardiac mass is still normal.
Significantly increased muscle mass with thickened walls; typical of severe hypertension.
Dilated heart chamber with high total muscle mass; typical of volume overload or regurgitation.
| Indexing Method | Unit | Men LVH Cutoff | Women LVH Cutoff |
|---|---|---|---|
| Height²·⁷ (2.7 method) | g/m²·⁷ | ≥ 51 | ≥ 47 |
| BSA (standard) | g/m² | ≥ 116 | ≥ 96 |
Height²·⁷ Reference Values
| Height (cm) | Height (m) | Height²·⁷ (m²·⁷) |
|---|---|---|
| 150 | 1.50 | 3.08 |
| 160 | 1.60 | 3.49 |
| 170 | 1.70 | 3.93 |
| 180 | 1.80 | 4.40 |
| 190 | 1.90 | 4.90 |
9 Sub-Calculator Variants
Specialized calculation variants designed for specific clinical contexts.
MDCalc
Standard MDCalc-style tool with direct BSA entry and full severity classification.
Open Tool →2.7 Exponent
Height²·⁷ indexing method (de Simone) for accurate LVH detection in obese patients.
Open Tool →Canadian Standards
CCS-aligned LVMI calculator with Canadian echo lab normative standards.
Open Tool →Echo Mode
Selectable measurement techniques with guideline-compliant cutoffs.
Open Tool →Parameters Tool
Interactive parameter validation tool with instant clinical status badges.
Open Tool →Pediatric
Child-specific reference ranges and percentiles for ages 1–17 years.
Open Tool →BSA Indexing
Dedicated BSA computation and LV mass indexing calculator.
Open Tool →Omni Calculator
All-in-one comprehensive cardiac mass analysis calculator.
Open Tool →RWT Calculator
Focused tool for wall-to-lumen ratio and concentric remodeling assessment.
Open Tool →Frequently Asked Questions
LVMI is calculated in echocardiography by first measuring three linear dimensions at end-diastole — interventricular septum thickness (IVSd), LV internal diameter (LVIDd), and posterior wall thickness (PWd) — then applying the ASE-recommended Devereux formula to compute LV mass, and finally dividing by Body Surface Area (BSA).
The Devereux formula is: LVM (g) = 0.8 × { 1.04 × [(IVSd + LVIDd + PWd)³ − LVIDd³] } + 0.6. All three measurements are taken in centimeters using M-mode or 2D-guided echocardiography at the level of the mitral valve tips during end-diastole.
Once LV mass is calculated, LVMI is obtained by dividing LVM by BSA: LVMI (g/m²) = LVM ÷ BSA. BSA is either entered directly or calculated from height and weight using the Mosteller formula: BSA = √(Height × Weight / 3600).
This method was validated by Richard B. Devereux against autopsy data and is recommended by the American Society of Echocardiography (ASE) and the European Association of Cardiovascular Imaging (EACVI) in the 2015 chamber quantification guidelines (Lang et al.).
The normal range for Left Ventricular Mass Index (LVMi) is 49–115 g/m² for men and 43–95 g/m² for women, based on ASE/EACVI guidelines (Lang et al., 2015).
Values above these thresholds indicate Left Ventricular Hypertrophy (LVH), classified by severity:
- Mildly Abnormal: 116–131 g/m² (men) / 96–108 g/m² (women)
- Moderately Abnormal: 132–148 g/m² (men) / 109–121 g/m² (women)
- Severely Abnormal: ≥ 149 g/m² (men) / ≥ 122 g/m² (women)
These sex-specific reference ranges account for the fact that the male heart is structurally larger on average. Using separate cutoffs prevents misclassification of normal female hearts as hypertrophied and avoids underdiagnosis in male patients.
Elevated LVMi values are associated with increased cardiovascular risk, including heart failure, stroke, and cardiovascular mortality. LVMi is used alongside Relative Wall Thickness (RWT) to classify cardiac geometry into four patterns: Normal Geometry, Concentric Remodeling, Concentric Hypertrophy, and Eccentric Hypertrophy.