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

Formula

g/ha = lb/acre × 1120.851156194

Derivation from SI units:

• 1 lb/acre = 0.45359237 kg ÷ 0.40468564224 ha ≈ 1.12085 kg/ha.
• 1 g/ha = 10⁻³ kg/ha.
• 1 lb/acre = 1.120851156194 kg/ha ÷ 0.001 kg/ha per g/ha = 1120.851156194 g/ha

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

Worked examples

1. A reading of 40 lb/acre converts to 44834.04625 g/ha.
   40 lb/acre × 1120.851156 = 44834.04625 g/ha
2. A value of 150 lb/acre is 168127.6734 g/ha.
   150 lb/acre × 1120.851156 = 168127.6734 g/ha

Where it's used

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

Pound per Acre to other application rate units

Frequently asked questions

Sources

• 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)".
• 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).

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