3斤是多少g？
3斤 = 1,500g
是1,500g，所以说成1,500g也没问题——四舍五入的误差在0.5%以内。
反过来，3g是多少斤？
3g = 0斤
计算公式: g = 斤 × 500
该数值前后的 斤 → g
1.2 斤600g
1.4 斤700g
1.6 斤800g
1.8 斤900g
2 斤1,000g
2.2 斤1,100g
2.4 斤1,200g
2.6 斤1,300g
2.8 斤1,400g
3 斤1,500g
3.2 斤1,600g
3.4 斤1,700g
3.6 斤1,800g
3.8 斤1,900g
4 斤2,000g
4.2 斤2,100g
4.4 斤2,200g
4.6 斤2,300g
4.8 斤2,400g
5 斤2,500g