Pounds per Acre to Tonnes per Hectare (lb/acre to t/ha)

Formula

t/ha = lb/acre × 0.001120851156194

or t/ha = lb/acre ÷ 892.1791216197

Derivation from SI units:

• 1 lb/acre = 0.45359237 kg ÷ 0.40468564224 ha ≈ 1.12085 kg/ha.
• 1 t/ha = 1000 kg/ha.
• 1 lb/acre = 1.120851156194 kg/ha ÷ 1000 kg/ha per t/ha = 0.001120851156194 t/ha

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

Worked examples

1. A reading of 40 lb/acre converts to 0.04483404625 t/ha.
   40 lb/acre × 0.001120851156 = 0.04483404625 t/ha
2. A value of 150 lb/acre is 0.1681276734 t/ha.
   150 lb/acre × 0.001120851156 = 0.1681276734 t/ha

Where it's used

Pounds per Acre are used for US fertiliser and seeding rates, while tonnes per hectare appear in crop yield (FAO, global statistics). 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.