USLE Soil Loss Calculator

USLE Soil Loss Formula

Worked Example

R = 800, K = 0.03, LS = 1.2, C = 0.3 and P = 0.5:

1. A = R K LS C P = 800 × 0.03 × 1.2 × 0.3 × 0.5 = 4.32 t/(ha·yr)

Soil loss as depth (at 1.5 t/m³): 0.288 mm/yr · Compared with tolerable loss: within the usual tolerance of about 11 t/(ha·yr)

GATE tip

Units must be consistent: R in MJ·mm/(ha·h·yr) with K in t·ha·h/(ha·MJ·mm) gives A in t/(ha·yr).

More Soil and Water Conservation Engineering Calculators

• SCS Curve Number Calculator

  Q = (P − Ia)² / (P − Ia + S)

  S = 25,400/CN − 254 mm; Ia = λS (λ = 0.2)

  Example: 100 mm of rain on a catchment with CN = 75: Direct runoff Q = 41.1371 mm.

  Open the scs curve number calculator →

• Infiltration Calculator

  f = fc + (f₀ − fc) e^(−kt)

  F = fc t + (f₀ − fc)(1 − e^(−kt))/k; Kostiakov F = a tᵇ

  Example: Horton with f₀ = 60 mm/h, fc = 10 mm/h and k = 2 per hour after one hour: Cumulative infiltration F = 31.6166 mm.

  Open the infiltration calculator →

Frequently asked questions

Sources

• The International System of Units (SI), 9th edition (SI Brochure), Bureau International des Poids et Mesures .

Last reviewed: 2026-10-15. Factors are stored exactly and computed with 50-digit decimal arithmetic. See how we verify conversion factors.