Earth Pressure Calculator

Calculate active, passive, and at-rest earth pressures using Rankine and Coulomb theories — free retaining wall design tool

RankineCoulomb

Ka = tan²(45° - φ/2)

Kp = tan²(45° + φ/2)

K0 = 1 - sinφ

Pa = 0.5·Ka·γ·H² + Ka·q·H - 2c√Ka·H

Input Parameters

Unit Weight γ (kN/m³)

Friction Angle φ (°)

Cohesion c (kN/m²)

Wall Height H (m)

Surcharge q (kN/m²)

Water Table (m)

Earth Pressure Coefficients

Ka (Active)

0.3333

K0 (At Rest)

0.5000

Kp (Passive)

3.0000

Active Pressure Distribution

0.0m

3.3 kPa

0.3m

4.8 kPa

0.5m

6.3 kPa

0.8m

7.8 kPa

1.0m

9.3 kPa

1.3m

10.8 kPa

1.5m

12.3 kPa

1.8m

13.8 kPa

2.0m

15.3 kPa

2.3m

16.8 kPa

2.5m

18.3 kPa

2.8m

19.8 kPa

3.0m

21.3 kPa

3.3m

22.8 kPa

3.5m

24.3 kPa

3.8m

25.8 kPa

4.0m

27.3 kPa

4.3m

28.8 kPa

4.5m

30.3 kPa

4.8m

31.8 kPa

5.0m

33.3 kPa

Earth Pressure

Water Pressure

Resultant Forces

Active Force Pa

91.67 kN/m

Passive Force Pp

825.00 kN/m

Point of Application (from base)

3.18 m