Area Unit Converter

Instant mutual conversion between m², hectares, and acres

The Area Unit Converter is a free online tool that allows you to instantly convert between major area units such as square meters (m²), hectares (ha), acres (ac), and square feet (ft²). Useful for comparing property sizes, calculating agricultural land areas, converting units in architectural plans, and understanding international land information - from everyday use to professional applications. All calculations are performed in your browser and no data is stored. We provide high-precision conversions based on accurate conversion formulas.

How to Use - Easy Conversion in 3 Steps

Using the Area Unit Converter is very simple:

Step 1: Select area and source unit
Enter the area value you want to convert and select the source unit (square meters, hectares, acres, square feet) from the dropdown menu.
Step 2: Select target unit
Select the target unit (square meters, hectares, acres, square feet) from the dropdown menu.
Step 3: View the result
The conversion result appears instantly as you type. You can also use the swap button to reverse the source and target units.

Input data is not stored on the server. All calculations are performed in your browser and your privacy is completely protected.

Enter area to convert

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Practical Examples of Area Unit Converter

Area unit conversion is used in a wide range of scenarios, from everyday life to specialized fields:

Understanding Property Sizes

In real estate, different units are used depending on the country. In the United States, square feet (sqft) and acres are common. 'A 1,500 sqft apartment' is approximately 139 square meters. In Japan, 'tsubo' and 'square meters' are used, where 1 tsubo ≈ 3.3 m². When comparing international properties, accurate unit conversion is essential to understand the actual size.

Calculating Agricultural Land Areas

In agriculture, 'hectare (ha)' is commonly used. 1 hectare = 10,000 square meters (100m × 100m). 'A 5-hectare farm' equals 50,000 square meters. In the United States, 'acre' is used, where 1 acre ≈ 4,047 square meters. 'A 100-acre farm' is approximately 40 hectares. Accurate conversion is necessary for land sales, agricultural land conversion, and crop calculations.

Unit Conversion in Architectural Plans

In the construction industry, square meters are used locally, while international plans use square feet (ft²) or square meters. 'A 2,000 square foot house' is approximately 186 square meters. 1 square foot ≈ 0.0929 square meters. Accurate conversion is important for building code calculations, floor area ratios, and material quantity calculations.

Understanding International Land Information

When considering purchasing real estate or investments abroad, different area units are used in each country. The United States and Canada use square feet (sqft) and acres, while Australia uses square meters and hectares, and China uses 'square meters'. 'A 5,000 sqft mansion' is approximately 465 square meters. Unit conversion is necessary to understand international properties in familiar measurements.

Land Surveying and Cadastral Surveys

In land surveying conducted by surveyors, square meters are the legal standard unit, but other units may be used for client communication. 'This land is registered at 250.50 square meters' is a typical statement. Accurate area is necessary for boundary determination, land subdivision/consolidation, and property valuation for inheritance.

Learning Area Units in Education

In elementary and secondary schools, students learn area units such as square centimeters (cm²), square meters (m²), square kilometers (km²), ares (a), and hectares (ha). Understanding relationships like '1 hectare = 10,000 square meters = 100 ares' and '1 square kilometer = 100 hectares = 1,000,000 square meters' can be enhanced using this tool as an educational aid.

Planning Garden and Horticulture Areas

When planning a home garden or horticulture, understanding the land area is important. 'A garden of 20 square meters' is sufficient for a home garden. Planting distances, required soil amounts, and fertilizer quantities are calculated based on area. When purchasing grass seeds or artificial turf, accurate area is required. 'A lawn of 50 square meters' needs approximately 5 kg of grass seeds.

What are Area Units? Main Units and Conversion Methods

Area is a physical quantity that expresses the size of the extent of plane figures or curved surfaces in numbers. It is used to measure the size of land, floor areas in buildings, and room sizes. Different area units are used depending on country, region, and purpose, and accurate conversion is necessary.

Metric Area Units

In the metric system based on the International System of Units (SI), area units are defined based on the length unit - the meter.

Square meter (m² / square meter)

The area of a square with sides of 1 meter. The world standard area unit, also used as the legal standard unit in most countries. Square meters are used in official documents such as real estate registration and building permits. '1m² = 1m × 1m'. A typical 6-tatami room (Japanese) is approximately 10m², a tennis court is approximately 260m².

Hectare (ha / hectare)

The area of a square with sides of 100 meters. 1 hectare = 10,000 square meters. Used mainly for agricultural land, forests, and large plots of land. 'One Tokyo Dome' is approximately 4.7 hectares, 'a 1-hectare rice field' means 100m × 100m. One hundredth of a hectare is 'are (a)', where 1a = 100m².

Square kilometer (km² / square kilometer)

The area of a square with sides of 1 kilometer (1,000 meters). 1km² = 1,000,000m² = 100 hectares. Used to express areas of cities and countries. 'The area of Tokyo's 23 wards is approximately 627km²' and 'Japan's area is approximately 377,975km²' are typical expressions.

Traditional Japanese Area Units

Tsubo (つぼ / tsubo)

Traditional Japanese area unit, 1 tsubo ≈ 3.30579 square meters. Equivalent to the area of two tatami mats (1 tsubo ≈ 2 tatami). Originally defined as the area of a square of 1 ken (approximately 1.818m) × 1 ken. Still widely used in the Japanese real estate industry, expressions like '30-tsubo plot' and '100-tsubo house' are common. Although square meters are the legal measurement, tsubo remains widely accepted.

Tatami (じょう / jo)

Unit representing the area of one tatami mat. 1 tatami ≈ 1.65 square meters (varies by region). 'A 6-tatami room' is approximately 10 square meters, approximately 3 tsubo. However, tatami size varies by region, with standards like Kyoma, Edoma, and apartment sizes. Designations like '6 tatami' and '8 tatami' are used in real estate floor plans.

Imperial Area Units

Traditional unit system used primarily in the United States and United Kingdom.

Square foot (ft² / square foot)

The area of a square with sides of 1 foot (approximately 30.48 cm). 1 square foot ≈ 0.0929 square meters. In American real estate, expressions like '1,500 sqft apartment' are common, which is approximately 139 square meters. Symbols: 'sq ft', 'sqft', 'ft²'.

Acre (ac / acre)

Unit used primarily to express land area. 1 acre = 4,840 square yards = 43,560 square feet ≈ 4,047 square meters. Used for agricultural land and large plots. 'A 100-acre farm' is approximately 40 hectares.

Square mile (mi² / square mile)

The area of a square with sides of 1 mile (approximately 1.609 km). 1 square mile ≈ 2.59 square kilometers = 259 hectares = 640 acres. Used to express areas of cities and countries. 'New York City's area is approximately 302 square miles' is a typical expression.

Benefits of the Area Unit Converter

Accurate conversion to prevent calculation errors

Area unit conversion uses complex conversion ratios like 1 tsubo = 3.30579m². Manual calculations can lead to errors, which can cause serious problems in real estate transactions and land surveying. This tool uses high-precision conversion formulas and calculates accurately to decimal places, completely eliminating calculation errors.

Instant conversion for increased work efficiency

No need to use a calculator to compute complex conversion ratios. Just enter the area value and select the units, and you'll see the result in real time. When comparing properties or checking information on multiple plots, rapid conversion significantly improves work efficiency.

Supports diverse area units

Supports all major area units used in Japan and abroad, including square meters (m²), tsubo, hectares (ha), acres (ac), and square feet (ft²). Free conversion between traditional units and international standards.

Free and always available anywhere

With an internet connection, accessible from any device - computer, smartphone, or tablet. No app installation or user registration required and completely free. You can convert units instantly anywhere, during property viewings or during field land surveys.

Safe without data storage

All calculations are performed in the browser and input area data or conversion results are not sent or stored on the server. Can be used safely even with confidential information such as corporate land information or personal real estate information.

Frequently Asked Questions (FAQ)

How many square meters are in 1 tsubo?

1 tsubo = exactly 3.30579 square meters. This is based on the area of 1 ken (approximately 1.818m) × 1 ken from the shaku-kan system. As a memory aid, '1 tsubo ≈ 3.3m²' and '1 tsubo ≈ 2 tatami' are useful. Conversely, 1 square meter ≈ 0.3025 tsubo.

How many square meters are in 1 hectare?

1 hectare (ha) = exactly 10,000 square meters (m²). The area of a square with sides of 100 meters, '100m × 100m = 10,000m²'. As a memory aid, '1ha = 10,000m²'. Also, 1 hectare ≈ 3,025 tsubo and = 100 ares (a).

How many square meters are in 1 acre?

1 acre ≈ 4,047 square meters (exactly 4,046.86m²). Also, 1 acre ≈ 1,224 tsubo and ≈ 0.405 hectares. Acres are used to express land area in countries using the imperial system like the United States and United Kingdom.

How many square meters is a 30-tsubo house?

30 tsubo ≈ 99.17 square meters. Calculation: 30 tsubo × 3.30579m²/tsubo = 99.1737m². '30 tsubo' is a standard size for the total floor area of a typical house, sufficient for a 3LDK to 4LDK layout.

How do I convert from square feet to square meters?

1 square foot (sqft) ≈ 0.0929 square meters. Conversion formula: square meters = square feet × 0.0929. For example, 'a 1,000 sqft apartment' ≈ 92.9 square meters. Square feet are common in American real estate, and '1,500-2,000 sqft' is approximately 40-60 tsubo in Japanese measurements.

What is the difference between 'private area 70m²' and 'wall-center area 75m²' in real estate advertisements?

'Private area (interior area)' is the area inside the walls, the actually usable living space. 'Wall-center area' is measured from the centerline of the wall and includes half the wall thickness, so it is larger than the private area. Private area is often used in real estate registration, while wall-center area is used in sales advertisements, leading to a 5-10% difference for the same property. When comparing properties, it's important to check which type of area is being used.

How many hectares is one Tokyo Dome?

Tokyo Dome's building area is approximately 46,755 square meters, or approximately 4.7 hectares. This equals approximately 14,146 tsubo. 'Tokyo Dome ◯' is a common metaphorical expression in Japan for expressing the size of large plots or facilities. 1 hectare is approximately one-fifth the size of Tokyo Dome.

What is the accuracy of this tool's calculations?

This tool uses accurate internationally agreed conversion ratios (1 tsubo = 3.30579m², 1ha = 10,000m², 1 acre = 4,046.86m², etc.) and decimal places are calculated accurately. However, displayed results may be rounded to an appropriate number of digits for easy reading. The tool is accurate enough for real estate transactions, land surveying, and architectural design.