A hedgehog is about 9.84 in (25 cm) long, while a porcupine is about 27.6 in (70 cm) long.

What is the height difference?

The hedgehog stands 5.91 in (15 cm) tall, whereas the porcupine is 11.8 in (30 cm) tall.

How much do they weigh?

A hedgehog weighs 1.76 lb (800 g) and a porcupine weighs 19.8 lb (9 kg).

A hedgehog is significantly smaller than a porcupine. You can visualize the difference by comparing a small pet to a medium-sized dog.

Biggest vs smallest

2.8× the size

porcupine vs hedgehog

hedgehog: about 9.84 in (25 cm) long and 5.91 in (15 cm) tall · 1.76 lb (800 g)
porcupine: about 27.6 in (70 cm) long and 11.8 in (30 cm) tall · 19.8 lb (9 kg)

Typical adult or standard sizes; real ones vary.

How long are they?: A hedgehog is about 9.84 in (25 cm) long, while a porcupine is about 27.6 in (70 cm) long.
What is the height difference?: The hedgehog stands 5.91 in (15 cm) tall, whereas the porcupine is 11.8 in (30 cm) tall.
How much do they weigh?: A hedgehog weighs 1.76 lb (800 g) and a porcupine weighs 19.8 lb (9 kg).