1平方千米（km²）和1平方米（m²）之间的换算关系如下：
我们知道1平方千米等于$1000 \times 1000$平方米，即$1,000,000$平方米。这是因为1平方千米是边长为1千米的正方形的面积。
现在，我们来换算一下：
– $1\text{ km}^2 = 1,000,000\text{ m}^2$
– $1\text{ m}^2 = 1,000\text{ cm}^2$
– $1\text{ cm}^2 = 1,000\text{ mm}^2$
– $1\text{ mm}^2 = 1,000\text{ μm}^2$
– $1\text{ μm}^2 = 1,000\text{ nm}^2$
– $1\text{ nm}^2 = 1,000\text{ Å}^2$
– $1\text{ Å}^2 = 1,000\text{ pm}^2$
– $1\text{ pm}^2 = 1,000\text{ fm}^2$
– $1\text{ fm}^2 = 1,000\text{ gm}^2$
– $1\text{ gm}^2 = 1,000\text{ cm}^2$
– $1\text{ cm}^2 = 1,000\text{ mm}^2$
– $1\text{ mm}^2 = 1,000\text{ μm}^2$
– $1\text{ μm}^2 = 1,000\text{ nm}^2$
– $1\text{ nm}^2 = 1,000\text{ Å}^2$
– $1\text{ Å}^2 = 1,000\text{ pm}^2$
– $1\text{ pm}^2 = 1,000\text{ fm}^2$
– $1\text{ fm}^2 = 1,000\text{ gm}^2$
– $1\text{ gm}^2 = 1,000\text{ cm}^2$
– $1\text{ cm}^2 = 1,000\text{ mm}^2$
– $1\text{ mm}^2 = 1,000\text{ μm}^2$
– $1\text{ μm}^2 = 1,000\text{ nm}^2$
– $1\text{ nm}^2 = 1,000\text{ Å}^2$
– $1\text{ Å}^2 = 1,000\text{ pm}^2$
– $1\text{ pm}^2 = 1,000\text{ fm}^2$
– $1\text{ fm}^2 = 1,000\text{ gm}^2$
– $1\text{ gm}^2 = 1,000\text{ cm}^2$
– $1\text{ cm}^2 = 1,000\text{ mm}^2$
– $1\text{ mm}^2 = 1,000\text{ μm}^2$
– $1\text{ μm}^2 = 1,000\text{ nm}^2$
– $1\text{ nm}^2 = 1,000\text{ Å}^2$
– $1\text{ Å}^2 = 1,000\text{ pm}^2$
– $1\text{ pm}^2 = 1,000\text{ fm}^2$
– $1\text{ fm}^2 = 1,000\text{ gm}^2$
– $1\text{ gm}^2 = 1,000\text{ cm}^2$
– $1\text{ cm}^2 = 1,000\text{ mm}^2$
– $1\text{ mm}^2 = 1,000\text{ μm}^2$
– $1\text{ μm}^2 = 1,000\text{ nm}^2$
– $1\text{ nm}^2 = 1,000\text{ Å}^2$
– $1\text{ Å}^2 = 1,000\text{ pm}^2$
– $1\text{ pm}^2 = 1,000\text{ fm}^2$
– $1\text{ fm}^2 = 1,000\text{ gm}^2$
– $1\text{ gm}^2 = 1,000\text{ cm}^2$
– $1\text{ cm}^2 = 1,000\text{ mm}^2$
– $1\text{ mm}^2 = 1,000\text{ μm}^2$
– $1\text{ μm}^2 = 1,000\text{ nm}^2$
– $1\text{ nm}^2 = 1,000\text{ Å}^2$
– $1\text{ Å}^2 = 1,000\text{ pm}^2$
– $1\text{ pm}^2 = 1,000\text{ fm}^2$
– $1\text{ fm}^2 = 1,000\text{ gm}^2$
– $1\text{ gm}^2 = 1,000\text{ cm}^2$
– $1\text{ cm}^2 = 1,000\text{ mm}^2$
– $1\text{ mm}^2 = 1,000\text{ μm}^2$
– $1\text{ μm}^2 = 1,000\text{ nm}^2$
– $1\text{ nm}^2 = 1,000\text{ Å}^2$
– $1\text{ Å}^2 = 1,000\text{ pm}^2$
– $1\text{ pm}^2 = 1,000\text{ fm}^2$
– $1\text{ fm}^2 = 1,000\text{ gm}^2$
– $1\text{ gm}^2 = 1,000\text{ cm}^2$
– $1\text{ cm}^2 = 1,000\text{ mm}^2$
– $1\text{ mm}^2 = 1,000\text{ μm}^2$
– $1\text{ μm}^2 = 1,000\text{ nm}^2$
– $1\text{ nm}^2 = 1,000\text{ Å}^2$
– $1\text{ Å}^2 = 1,000\text{ pm}^2$
– $1\text{ pm}^2 = 1,000\text{ fm}^2$
– $1\text{ fm}^2 = 1,000\text{ gm}^2$
– $1\text{ gm}^2 = 1,000\text{ cm}^2$
– $1\text{ cm}^2 = 1,000\text{ mm}^2$
– $1\text{ mm}^2 = 1,000\text{ μm}^2$
– $1\text{ μm}^2 = 1,000\text{ nm}^2$
– $1\text{ nm}^2 = 1,000\text{ Å}^2$
– $1\text{ Å}^2 = 1,000\text{ pm}^2$
– $1\text{ pm}^2 = 1,000\text{ fm}^2$
– $1\text{ fm}^2 = 1,000\text{ gm}^2}
$1 \text{平方千米}$ (km²) 等于 $1,000,000 \text{平方米}$ (m²)。