Grams per Hectare to Pounds per Acre (g/ha to lb/acre)

Formula

lb/acre = g/ha × 0.0008921791216197

or lb/acre = g/ha ÷ 1120.851156194

Derivation from SI units:

• 1 g/ha = 10⁻³ kg/ha.
• 1 lb/acre = 0.45359237 kg ÷ 0.40468564224 ha ≈ 1.12085 kg/ha.
• 1 g/ha = 0.001 kg/ha ÷ 1.120851156194 kg/ha per lb/acre = 0.0008921791216197 lb/acre

Both units are defined exactly, so the factor is exact. Gram per Hectare definition: gram per hectare; Pound per Acre definition: pound per acre.

Worked examples

1. A reading of 25 g/ha converts to 0.02230447804 lb/acre.
   25 g/ha × 0.0008921791216 = 0.02230447804 lb/acre
2. A value of 200 g/ha is 0.1784358243 lb/acre.
   200 g/ha × 0.0008921791216 = 0.1784358243 lb/acre

Where it's used

Grams per Hectare are used for pesticide label rates (g a.i./ha), while pounds per acre appear in US fertiliser and seeding rates. Both measure mass applied or harvested per unit land area, so the conversion is a fixed factor.

Gram per Hectare to other application rate units

Frequently asked questions

Sources

• The International System of Units (SI), 9th edition (SI Brochure), Bureau International des Poids et Mesures , Table 4 (derived units) and Table 8 (non-SI units accepted for use with the SI).
• Guide for the Use of the International System of Units (SI), NIST Special Publication 811, 2008 Edition, National Institute of Standards and Technology , Appendix B.8, "pound (avoirdupois)".

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