Acres.si
The AI guide to land measurement and acreage
Understand how land gets measured, from acres and hectares to historical units like the rood and the hide. Convert, compare, and learn the surveying methods behind every property line.
No card required · $9/mo Plus · $99/mo Premium
What you get
Everything Acres.si gives you
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Instant unit conversions
Acres, hectares, square feet, and square meters, explained with the math.
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Surveying history explained
From metes and bounds to modern GPS surveying.
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Farmland and real estate context
How acreage is used in agriculture and property listings.
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Saved conversation history
Sign in free and keep every conversion and question for later.
Go deeper
Land Measurement Knowledge Base
Core units, systems, and history behind how land gets measured.
Units of Land Area
- Acre — 43,560 square feet; originated as the area a yoke of oxen could plow in a day.
- Hectare — 10,000 square meters, the standard metric unit used across most of the world.
- Rood — A historical English unit equal to a quarter of an acre.
- Hide — An old English unit representing enough land to support one household.
- Section — One square mile, or 640 acres, under the US Public Land Survey System.
Surveying Systems
- Metes and Bounds — A boundary description method using landmarks, distances, and directions.
- Public Land Survey System — The US grid of townships, ranges, and sections used to describe land.
- GPS and GNSS Surveying — Modern satellite-based positioning used for precise boundary mapping.
- Cadastral Survey — Official surveys that establish and record property boundaries and ownership.
Pricing
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Plus
$9/mo
- ✓200 questions per day
- ✓Full saved conversation history
- ✓Custom land-size comparisons
Premium
$99/mo
- ✓Unlimited questions
- ✓Extended deep-dive answers
- ✓Everything in Plus