Earth Resistance Calculator

Accurate earth resistance calculations for grounding systems

Earth Resistance Calculator

Compliant with IEEE 80 Standards

Electrode Type:

Soil Resistivity (ρ) in Ω·m:

Plate Area (A) in m²:

Rod Length (L) in m:

Rod Diameter (d) in m:

Strip Length (L) in m:

Strip Width (w) in m:

Strip Thickness (t) in m:

Results:

Earth Resistance (R): 0.00 Ω

Electrode Type: -

Soil Condition: -

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How to Use the Calculator

Plate Earth Electrode

Select "Plate Earth Electrode"
Enter soil resistivity in Ω·m
Input plate area in m²
Click calculate for resistance

Earth Rod Electrode

Select "Earth Rod Electrode"
Enter soil resistivity in Ω·m
Input rod length in meters
Enter rod diameter in meters

Earth Strip Electrode

Select "Earth Strip Electrode"
Enter soil resistivity in Ω·m
Input strip length, width, and thickness
All dimensions in meters

Earth Resistance Fundamentals

Plate Electrodes

Plate electrodes provide:

Large contact area with soil
Low resistance for high current applications
Suitable for substations and large installations

Rod Electrodes

Easy installation and maintenance
Suitable for residential and commercial use
Can be driven deep into soil

Strip Electrodes

Horizontal installation in trenches
Good for rocky or hard soil conditions
Provides distributed grounding

Key Factors:

Soil resistivity varies with moisture, temperature, and composition

Lower resistance provides better safety and equipment protection

Multiple electrodes can be connected in parallel to reduce total resistance

Calculation Formulas

Plate Earth Electrode:
R = ρ / (2 × √(πA))

Earth Rod Electrode:
R = ρ / (2πL) × (ln(8L/d - 1))

Earth Strip Electrode:
R = (ρ / (2 × π × L)) × ln(2 × L² / (w × t))

Example Calculation

Earth Rod Electrode:

Soil Resistivity: 100 Ω·m

Rod Length: 3m

Rod Diameter: 0.016m

R = 100 / (2π × 3) × (ln(8 × 3 / 0.016 - 1))

R = 100 / 18.85 × (ln(1499))

R = 5.31 × 7.31 = 38.8 Ω

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