Grams per Square Meter to Pounds per Acre (g/m2 to lb/acre)

Formula

lb/acre = g/m² × 8.921791216197

Derivation from SI units:

• 1 g/m² = 10 kg/ha.
• 1 lb/acre = 0.45359237 kg ÷ 0.40468564224 ha ≈ 1.12085 kg/ha.
• 1 g/m² = 10 kg/ha ÷ 1.120851156194 kg/ha per lb/acre = 8.921791216197 lb/acre

Both units are defined exactly, so the factor is exact. Gram per Square Meter definition: gram per square meter; Pound per Acre definition: pound per acre.

Worked examples

1. A reading of 10 g/m² converts to 89.21791216 lb/acre.
   10 g/m² × 8.921791216 = 89.21791216 lb/acre
2. A value of 25 g/m² is 223.0447804 lb/acre.
   25 g/m² × 8.921791216 = 223.0447804 lb/acre

Where it's used

Grams per Square Meter are used for garden and lawn fertiliser, 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 Square Meter 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.