Prawn Cooking Time Calculator
Prawns are shellfish, not a fillet of fish, so they cook in minutes rather than the tens of minutes a fillet takes. Choose the size and method for the time and the visual signs that they are done.
The time is per piece. This only affects how you space them out.
Answer
2–3 minutes
The details
How to tell it is done
Raw prawns turn from grey and glassy to pink and completely opaque, and they curl into a loose C shape. A tight curl means they are overdone.
Times are a guide. Thickness, how cold the food was and how full the oven is all change the answer, so check before you serve.
Next step
Worth knowing
- Small or medium: Peeled cold-water prawns.
- Medium-high heat, a little oil, and do not crowd the pan.
- These times are for raw prawns. Prawns sold already cooked and pink only need warming through for a minute or two.
- Prawns are the easiest thing in the kitchen to overcook. Take them off the heat the moment they turn opaque.
Food safety
- Official UK guidance checks fish by sight rather than by a single temperature: the flesh should turn opaque and flake apart easily with a fork. Prawns, scallops, crab and lobster should be firm and opaque, and mussels, clams and oysters should have opened, throw away any that stay shut.
- Cooking times are a guide only. Ovens, joints and starting temperatures vary, so always check the food is cooked before serving rather than relying on the clock.
Source: Food Standards Agency, Cooking your food: cooking fish and seafood (GOV.UK) · Reviewed 2026-09-11 · Guidance version 2.0.0
Source: Food Standards Agency, Cooking your food: cooking fish and seafood (GOV.UK) · Reviewed 2026-09-11 · Guidance version 2.0.0
Reference and detail
Raw versus already cooked
Raw prawns are grey and translucent and need proper cooking. Prawns sold pink are already cooked and only need warming through for a minute or two, adding them too early overcooks them, so stir them in for the last minute of a dish.
Firm and opaque, not flaky
Unlike a fillet of fish, prawns do not flake. They are done when they turn from grey and translucent to pink and completely opaque, feel firm, and curl into a loose C shape. A tight, hard O shape means they have gone too far and will be rubbery.
Defrost properly first
Cook prawns from properly defrosted rather than part-frozen, or the outside will be tough by the time the middle is hot. Defrost them in the fridge, not on the worktop.
Questions and answers
Questions about cooking prawns
How do I know if prawns are raw or already cooked?
Raw prawns are grey or bluish-grey and translucent; cooked prawns are pink or pinkish-orange and opaque. Bags labelled 'cooked' or with pink prawns pictured on the front only need warming through, not cooking from raw.
Does prawn size affect cooking time?
Yes, size grades such as small, king and tiger prawns cook at noticeably different speeds because they differ in thickness, not just length. Choose the size above rather than judging by eye, since a jumbo king prawn needs several times longer than a small one.
Why do my prawns come out rubbery?
Overcooking is almost always the cause. Prawns are ready the moment they turn pink, opaque and curl into a loose C shape; once they tighten into a full O they have gone too far and the texture turns tough within seconds.
Can I add raw prawns straight into a hot sauce or stir-fry?
Yes, but add them near the end of cooking rather than at the start, since they need only a few minutes. If the prawns are frozen, defrost them fully in the fridge first so they cook evenly rather than releasing water into the pan.
Safety guidance reviewed against Food Standards Agency sources on 11 September 2026. How we calculate cooking times and safety guidance.