Acres to Hectares (ac to ha) Converter

Acres to Hectares: What You Need to Know

International agricultural investment requires this conversion at every stage. American farmland investment funds reporting performance to European limited partners must express their portfolio in hectares. A fund holding 50,000 acres of Iowa cropland has 20,234 hectares — directly comparable with European farmland fund portfolios. Per-hectare farmland values in Iowa at around 2,000 dollars per acre are about 4,942 dollars per hectare, comparable with German farmland at 15,000 to 40,000 euros per hectare. Carbon credit markets require hectares for international certification. American reforestation, grassland restoration, and wetland conservation projects that generate carbon credits for international markets must express their project area in hectares for Verra VCS, Gold Standard, and Article 6 Paris Agreement compliance. A 1,000-acre riparian buffer restoration project is 404.7 hectares of carbon sequestration area — the first calculation performed in every American carbon project's international certification process. Wildfire damage reporting in international comparative studies converts American fire season data in acres to hectares. The 2020 US wildfire season burned about 10.1 million acres or 4.09 million hectares — comparable to Portugal's total land area (9.2 million hectares) being half consumed, a comparison that only becomes vivid in hectares for a European audience. UN Food and Agriculture Organization agricultural census data uses hectares; USDA agricultural census data uses acres. Comparing US crop area statistics with FAO world crop data requires this conversion for every single crop and every year. A researcher comparing American and global soybean acreage uses this conversion hundreds of times in a single analysis.

Going the other way? Use our Hectares to Acres converter.

Acres to Hectares FAQ

• How many hectares are in one acre?

  Approximately 0.4047 hectares. One acre is 4,046.86 square meters, and one hectare is 10,000 square meters: 4,046.86 ÷ 10,000 = 0.40469. The shortcut: one acre is about 0.4 hectares.

• How many acres are in one hectare?

  Approximately 2.471 acres. The reciprocal of 0.40469 is 2.4711. The shortcut: one hectare is about 2.5 acres — accurate to within 1.2 percent.

• What is the easiest way to convert?

  Acres to hectares: multiply by 0.4 (exact is 0.4047, so this underestimates by 1.2%). Hectares to acres: multiply by 2.5 (exact is 2.471, so this overestimates by 1.2%). For official or financial calculations, use the exact 0.404686 multiplier. For farm gate conversations, the 0.4 and 2.5 shortcuts are universally accepted.

Non-Frequently Asked Questions About Acres to Hectares

Questions nobody should ask - but someone did.

• How many Eiffel Towers could fit in one acre, base-to-base?

  The Eiffel Tower's base is about 125 × 125 meters = 15,625 square meters. One acre is 4,047 square meters. Not even one Eiffel Tower base fits in one acre — the base is nearly 4 times larger than one acre. You would need 3.86 acres to fit one Eiffel Tower footprint. This should recalibrate any intuition that acres are large.

• Is the 2.5 acres per hectare shortcut good enough for farmers?

  Yes, universally. The exact 2.471 versus the approximate 2.5 creates an error of 1.2 percent — for a 100-hectare farm, the approximation gives 250 acres when the true figure is 247.1 acres. A difference of 2.9 acres on a 247-acre farm is less than 1.2 percent — well within the measurement uncertainty of any field estimate. Farm gate conversations use 2.5 without apology.

• How many football pitches is one hectare?

  A standard FIFA pitch is 68×105 = 7,140 square meters. One hectare is 10,000 square meters. One hectare is 1.4 football pitches — or one football pitch is 0.714 hectares. This means a standard football pitch is about 1.76 acres (0.714 × 2.471). Football pitches are annoyingly non-round in both acres and hectares.