Acre to Hectare Converter

Step-by-Step Guide

1. 1Enter your acre value: Type any number of acres into the input field. Decimals are fully supported — 0.25, 1.5, or 640 all work. The hectare result appears instantly as you type.
2. 2Read the hectare result: The hectare equivalent displays immediately. For 1 acre, the result is 0.404686 hectares. For 10 acres, it is 4.04686 hectares. The result updates with every keystroke.
3. 3Adjust decimal precision: Use the precision selector to choose 2, 4, 6, or 8 decimal places. Four decimal places covers most agricultural and real estate needs; six or more for legal or scientific precision.
4. 4Use presets for common values: Click any preset button — 0.25, 0.5, 1, 5, 10, or 100 acres — to instantly load standard values. Presets cover the most common residential lot and farm field sizes.
5. 5Swap to hectares-to-acres: Click the swap button to reverse the conversion direction. Enter hectares and receive acres — the same tool covers both directions without navigating to a different page.
6. 6Copy or export your result: Click copy to send the result to clipboard, or download a text report of your conversion history for documentation, client handoff, or property records.

What This Tool Provides

• ✓Instant acres to hectares conversion
• ✓Reverse conversion: hectares to acres
• ✓2, 4, 6, and 8 decimal precision
• ✓Presets: 0.25, 0.5, 1, 5, 10, 100 acres
• ✓Full reference table (common values both directions)
• ✓Land size context descriptions
• ✓Conversion history (last 10 entries)
• ✓Copy result to clipboard
• ✓Export conversion report
• ✓100% browser-based — no data sent to server
• ✓No registration required

Pro Tips

• 💡Use ÷2.5 as a mental shortcut for rough estimates — divide acres by 2.5 for an approximate hectare count. It is 1.2% low (underestimates by about 1 hectare per 83 acres), which is acceptable for casual sizing but not for legal or financial documents.
• 💡For international grant applications and research submissions, hectares are almost always the required unit. Convert any acre-based data to hectares before submitting to FAO, EU, or UN agencies.
• 💡Cross-check large conversions: 640 acres should give approximately 259 hectares (the exact value is 258.999). If your answer is far from 259, check whether you multiplied instead of divided.
• 💡When buying overseas land measured in acres, always verify whether the listing uses US or UK acres — they are the same unit (both 4,046.86 m²), but some historical UK documents used a surveying acre that is slightly different. Modern deeds use the standard international acre.
• 💡For carbon credit and environmental project registration, use 6 decimal places — small area differences compound over multi-year contracts. The difference between 0.4047 and 0.404686 per acre is negligible on small areas but meaningful on thousands of acres over decades.

Common Mistakes to Avoid

• ✕Don't divide by 2.5 for official documents. The correct factor is 0.404686 — using ÷2.5 (= × 0.4) introduces a 1.2% error. On 1,000 acres: the shortcut gives 400 ha; the correct answer is 404.69 ha — a difference of 4.69 hectares.
• ✕Don't confuse acres with square footage in the formula. Acres and square feet are both imperial area units but are not interchangeable. 1 acre = 43,560 sq ft. Converting sq ft to hectares requires a different factor: 1 sq ft = 0.0000929 ha.
• ✕Don't invert the formula. Acres to hectares: multiply by 0.404686. Hectares to acres: multiply by 2.47105. Multiplying acres by 2.47105 gives a result 6× too large — a common error when the user forgets which direction they are converting.
• ✕Don't assume 'land area' in a document is always in gross area. Usable farmland or net developable area can differ significantly from the gross parcel area stated in the deed, especially for parcels with water bodies, easements, or steep terrain. Convert what the document states, then clarify with the landowner what is usable.
• ✕Don't use the same conversion for roods, perches, or other historical land units. Older British land records may use acres, roods, and perches (ARP notation). A rood is ¼ acre and a perch is 1/160 acre. Convert each unit separately before applying the acre-to-hectare factor.

Acres → Hectares

Hectares → Acres