Area Unit Converter

Site plans, equipment footprints and pipe bores are quoted in square metres on one drawing, acres on a parcel record and square feet on an imperial panel, while a hectare means something specific to a process yard. This converter moves exactly between metric and imperial area with no approximation.

Convert area unit units

Value

From

Why area units collide

Metric area is decimal (m², cm², mm², km²) while imperial area stacks square inches, feet, yards and miles on the same non-decimal length bases that already cause conversion errors. The hectare (10 000 m²) and the acre (4046.8564224 m²) are the practical land units in between.

All factors are exact definitions — 1 ft² = 0.09290304 m², 1 acre = 4046.8564224 m², 1 ha = 10 000 m² — so the converter returns exact values, not rounded ones. The only discipline is carrying the unit with the number.

Which unit where

Square metres rule piping, panel and equipment drawings; hectares and acres describe process yards, tank farms and parcels; square feet are the imperial language of structural and HVAC layouts. Convert at the boundary rather than mixing units inside one calculation.

Complete conversion reference

Convert 1 unit to	m²	km²	cm²	mm²	ha	acre	ft²	yd²	mi²	in²
1 m²	1	1e-06	10000	1e+06	0.0001	0.000247105	10.7639	1.19599	3.86102e-07	1550
1 km²	1e+06	1	1e+10	1e+12	100	247.105	1.07639e+07	1.19599e+06	0.386102	1.55e+09
1 cm²	0.0001	1e-10	1	100	1e-08	2.47105e-08	0.00107639	0.000119599	3.86102e-11	0.155
1 mm²	1e-06	1e-12	0.01	1	1e-10	2.47105e-10	1.07639e-05	1.19599e-06	3.86102e-13	0.00155
1 ha	10000	0.01	1e+08	1e+10	1	2.47105	107639	11959.9	0.00386102	1.55e+07
1 acre	4046.86	0.00404686	4.04686e+07	4.04686e+09	0.404686	1	43560	4840	0.0015625	6.27264e+06
1 ft²	0.092903	9.2903e-08	929.03	92903	9.2903e-06	2.29568e-05	1	0.111111	3.58701e-08	144
1 yd²	0.836127	8.36127e-07	8361.27	836127	8.36127e-05	0.000206612	9	1	3.22831e-07	1296
1 mi²	2.58999e+06	2.58999	2.58999e+10	2.58999e+12	258.999	640	2.78784e+07	3.0976e+06	1	4.01449e+09
1 in²	0.00064516	6.4516e-10	6.4516	645.16	6.4516e-08	1.59423e-07	0.00694444	0.000771605	2.49098e-10	1

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Frequently asked

How many square metres in an acre?

Exactly 4046.8564224 m² (1 acre = 43 560 ft², and 1 ft² = 0.09290304 m²). The converter returns the exact value, so you avoid the common decimal slip.

What is a hectare in m²?

One hectare is exactly 10 000 m², or 0.01 km². It is the metric land unit used for process yards and tank farms; do not confuse it with a hectare-sized acre (which would be wrong by fourfold).

Is ft² the same as m²?

No. One square foot is about 0.0929 m², so a 100 ft² footprint is roughly 9.29 m². Always convert rather than reading the number as if the unit were the same.

Why do drawings mix m² and ft²?

Metric structure uses m² while imperial components (panels, HVAC, structural steel) quote ft². Convert at the interface to avoid a silent factor error in a footprint or bore area.

This page performs exact unit arithmetic with no physical assumption beyond the stated reference (for example mH₂O assumes water near 4 °C, and pH follows its logarithmic definition). It is a working aid, not a substitute for the measurement method named in your permit.