Convert Square Feet to Hectares - Area Converter
This converter converts area values from square feet (ft²) to hectares (ha) and vice versa using internationally accepted unit definitions. It is intended for quick conversions, planning, GIS checks, and preparing data for land records.
The hectare (ha) is a metric unit equal to 10,000 square metres and is accepted for use with the International System of Units (SI). The square foot is derived from the international foot (1 ft = 0.3048 m) and therefore can be expressed exactly in square metres, enabling an exact conversion between ft² and ha.
Use this tool for calculations and estimating area. For legally binding land measurements, cadastral surveys, or contractual tolerances, consult a licensed surveyor or the relevant local land registry.
Governance
Record d50629fbfc6d • Reviewed by Fidamen Standards Committee
Interactive Converter
Convert between square foot and hectare with precision rounding.
Quick reference table
| Square Foot | Hectare |
|---|---|
| 1 ft² | 0 ha |
| 5 ft² | 0 ha |
| 10 ft² | 0.0001 ha |
| 25 ft² | 0.0002 ha |
| 50 ft² | 0.0005 ha |
| 100 ft² | 0.0009 ha |
Methodology
We convert through the SI base unit (square metre). The international foot is defined exactly as 0.3048 metres, so 1 ft² = (0.3048 m)² = 0.09290304 m². One hectare is exactly 10,000 m².
From those definitions you get an exact conversion factor between square feet and hectares. This approach follows measurement standards from national metrology institutes and the SI Bureau.
Recommendations and practical notes reference authoritative sources for unit definitions, surveying practices, and GIS precision to help you apply conversions correctly in technical or legal contexts.
Key takeaways
Multiply square feet by 0.000009290304 to obtain hectares. The conversion is exact when using the internationally defined foot and the hectare definition through square metres.
For survey, GIS, and legal use, combine this conversion with proper measurement practice, coordinate reference systems, and jurisdictional rules.
Worked examples
Example 1: Convert 10,000 ft² to hectares → 10,000 × 0.000009290304 = 0.09290304 ha.
Example 2: Convert 2.5 ha to square feet → 2.5 ÷ 0.000009290304 ≈ 268,819.555 ft² (round per required precision).
F.A.Q.
What is the exact conversion factor from square feet to hectares?
Using exact definitions, 1 square foot = 0.09290304 m² and 1 hectare = 10,000 m², so 1 ft² = 0.000009290304 ha. Multiply square feet by 0.000009290304 to get hectares.
Is the hectare an SI unit?
The hectare is not a base SI unit but it is accepted for use with the International System of Units (SI). The SI brochure and national metrology institutes document this acceptance.
How many decimal places should I use for land transactions or planning?
Decimal precision depends on purpose and jurisdiction. For large-area planning two to four decimal places in hectares is common; cadastral or engineering surveys often require centimeter-level precision and will report more digits. Always follow local registry or survey standards.
Can I use this conversion for cadastral parcels, property deeds, or permitting?
This tool provides accurate mathematical conversions, but legal or certified measurements require licensed surveyors, certified instruments, and adherence to local cadastral rules. Consult the local land registry or a licensed surveyor for legally binding figures.
How does measurement instrument accuracy affect converted results?
Instrument accuracy (e.g., consumer GPS, survey-grade GNSS, total station) determines the meaningful precision of any area measurement. Converting a value does not improve measurement error; report converted results with precision commensurate to the original measurement's uncertainty.
Why convert via square metres instead of using a single direct multiplier?
Converting via square metres uses SI-consistent exact definitions (1 ft = 0.3048 m, 1 ha = 10,000 m²). That route ensures traceability to international standards and avoids ambiguity in unit definitions.
Does geodetic projection or map scale affect area conversions?
Yes. Flat-area conversions (ft² ↔ ha) assume the numeric area is already in consistent planar units. For geospatial work, ensure areas are computed in an appropriate projected coordinate system for the region to avoid distortion; then convert the numeric area between units.
How can I check large-batch conversions for consistency?
Use this exact conversion factor in automated processes and validate with spot checks. For critical datasets, perform independent checks using GIS software or reference calculators, and maintain provenance for input units and coordinate reference systems.
Sources & citations
- BIPM — The International System of Units (SI) brochure — https://www.bipm.org/en/publications/si-brochure
- NIST — Metric, SI, and measurement units information — https://www.nist.gov/pml/weights-and-measures/metric-si
- NOAA/National Geodetic Survey — Geodesy and measurement accuracy resources — https://geodesy.noaa.gov/faq.shtml
- FAO — Agricultural statistics and area reporting (FAOSTAT) — https://www.fao.org/faostat/en/#home
- ISO 80000-3:2019 — Space and time — https://www.iso.org/standard/64974.html
- NIST SP 811 — Guide for the Use of the International System of Units — https://www.nist.gov/pml/special-publication-811
Further resources
Related tools
Versioning & Change Control
Audit record (versions, QA runs, reviewer sign-off, and evidence).
Record ID: d50629fbfc6dWhat changed (latest)
v1.0.0 • 2025-11-23 • MINOR
Initial publication and governance baseline.
Why: Published with reviewed formulas, unit definitions, and UX controls.
Public QA status
PASS — golden 25 + edge 120
Last run: 2026-01-23 • Run: golden-edge-2026-01-23
Versioning & Change Control
Audit record (versions, QA runs, reviewer sign-off, and evidence).
What changed (latest)
v1.0.0 • 2025-11-23 • MINOR
Initial publication and governance baseline.
Why: Published with reviewed formulas, unit definitions, and UX controls.
Public QA status
PASS — golden 25 + edge 120
Last run: 2026-01-23 • Run: golden-edge-2026-01-23
Engine
v1.0.0
Data
Baseline (no external datasets)
Content
v1.0.0
UI
v1.0.0
Governance
Last updated: Nov 23, 2025
Reviewed by: Fidamen Standards Committee (Review board)
Credentials: Internal QA
Risk level: low
Reviewer profile (entity)
Fidamen Standards Committee
Review board
Internal QA
Entity ID: https://fidamen.com/reviewers/fidamen-standards-committee#person
Semantic versioning
- MAJOR: Calculation outputs can change for the same inputs (formula, rounding policy, assumptions).
- MINOR: New features or fields that do not change existing outputs for the same inputs.
- PATCH: Bug fixes, copy edits, or accessibility changes that do not change intended outputs except for previously incorrect cases.
Review protocol
- Verify formulas and unit definitions against primary standards or datasets.
- Run golden-case regression suite and edge-case suite.
- Record reviewer sign-off with credentials and scope.
- Document assumptions, limitations, and jurisdiction applicability.
Assumptions & limitations
- Uses exact unit definitions from the Fidamen conversion library.
- Internal calculations use double precision; display rounding follows the unit's configured decimal places.
- Not a substitute for calibrated instruments in regulated contexts.
- Jurisdiction-specific rules may require official guidance.
Change log
v1.0.0 • 2025-11-23 • MINOR
Initial publication and governance baseline.
Why: Published with reviewed formulas, unit definitions, and UX controls.
Areas: engine, content, ui • Reviewer: Fidamen Standards Committee • Entry ID: 8492e7012c7a