Crab Cook Time Calculator
Exact cooking times for crab only — blue crab, Dungeness, snow crab, king crab and stone crab claws — by type, method (steam, boil, bake, grill) and form (whole vs clusters and legs). Includes a full time chart, worked examples, a 145°F doneness checker and a food-safety section. This tool covers crab only — for other proteins see our lobster cook time calculator and shrimp cook time calculator.
Weight in pounds. Steam time is driven by the individual crab's weight, not the total weight in the pot.
Steam keeps the sweetest flavor; boil is fastest for crowds; bake and grill suit legs and claws.
Legs and clusters cook about 25% faster than whole crab because the shell is thinner and heat reaches the meat directly. Snow and king crab are sold as legs only, so this comparison applies to Dungeness.
Insert an instant-read thermometer into the thickest part of the body or leg meat. Crab is done at 145°F (63°C) — the FDA-recommended temperature for seafood.
How the times are calculated
Crab cooking time is driven by heat penetration into the thickest meat — the body of a whole crab or the fattest leg segment — so time grows with the individual piece size, not with how many crabs are in the pot. Two 2-lb Dungeness crabs steam in the same 20 minutes as one; a crowded pot only costs you 1–2 extra minutes because the pot takes longer to recover to full steam.
This calculator models each crab type and method with its own linear curve, rounded to whole minutes (fractions of 0.5 round up). Two worked checks on the model:
- Dungeness, steam, 2 lb: 16 + 2 × 2 = 20 minutes.
- Blue crab, steam, a dozen (12 crabs): 22 + 0.25 × 12 = 25 minutes.
Snow crab clusters and king crab legs are almost always sold precooked and frozen — cooking them means reheating, which is why their times are shorter. Stone crab claws are also sold precooked and are traditionally served chilled with mustard sauce; heating is optional and brief.
Crab cook time chart
Reference times for common batches. The calculator above gives exact times for your weight or count.
| Crab type (standard batch) | Steam | Boil | Bake | Grill (total, per side) |
|---|---|---|---|---|
| Blue crab, whole — per dozen | 25 min | 16 min | 17 min @ 425°F | 12 min (6/side) |
| Dungeness, whole — 2 lb | 20 min | 18 min | 18 min @ 425°F | 14 min (7/side) |
| Snow crab clusters, raw — 2 lb | 10 min | 7 min | 10 min @ 400°F | 8 min (4/side) |
| King crab legs, precooked — 2 lb | 7 min | 5 min | 12 min @ 350°F | 10 min (5/side) |
| Stone crab claws, precooked — 2 lb | 8 min | 6 min (hot-water dip) | — | — |
How much crab to buy
| Crab type | Buy per person | Approximate cooked-meat yield |
|---|---|---|
| Blue crab (whole) | 1 dozen medium | ≈ 14% of whole weight — roughly 6–8 oz picked meat per dozen medium |
| Dungeness (whole) | 1–1.5 lb | ≈ 25% of whole weight — a 2 lb crab gives about ½ lb meat |
| Snow crab (clusters/legs) | ¾–1 lb | ≈ 50–60% of leg weight |
| King crab (legs) | ¾–1 lb | ≈ 50–60% of leg weight |
| Stone crab (claws) | ¾ lb | Sold precooked by the pound; 2–3 large claws per person as an appetizer |
Worked examples
Example 1 — Steam a 2 lb Dungeness crab (20 minutes)
- Select: type = Dungeness crab, method = Steam, weight = 2 lb.
- Model: steam time = 16 + 2 × weight = 16 + 2 × 2 = 20 minutes.
- Cook: bring 2 inches of salted water to a hard boil in a tall covered pot, lower in the crab belly-down, cover and start timing when the pot returns to a full head of steam.
- Check: shell turns bright orange-red; thickest body meat is opaque white and reads 145°F (63°C) on an instant-read thermometer.
- Rest: 5 minutes before cracking — the meat firms up and finishes evenly.
Example 2 — Steam a dozen blue crabs (25 minutes)
- Select: type = Blue crab, method = Steam, amount = 12 crabs (1 dozen).
- Model: steam time = 22 + 0.25 × crabs = 22 + 0.25 × 12 = 25 minutes.
- Cook: layer the crabs in a steamer over boiling salted water, dusting each layer with seasoning (Maryland-style). Cover and do not lift the lid.
- Check: shells turn bright red-orange edge to edge; body meat is opaque white and reads 145°F (63°C).
- Rest: 5 minutes, then serve with drawn butter or vinegar.
Example 3 — Reheat 2 lb of frozen king crab legs (7 minutes)
- Select: type = King crab (precooked), method = Steam, weight = 2 lb.
- Model: steam reheat time = 5 + 0.75 × weight = 5 + 0.75 × 2 = 6.5 → 7 minutes.
- Cook: thaw legs overnight in the refrigerator if time allows; steam over 2 inches of boiling water, covered, for 7 minutes.
- Check: meat is steaming hot throughout and reads 145°F (63°C). Do not re-boil hard — precooked legs toughen fast past this point.
- Serve: immediately with clarified butter and lemon.
Food safety for crab
- Live crabs must be alive when they go into the pot — discard any that are dead before cooking.
- Shell turning red is a helpful cue but not proof — only a thermometer confirms doneness.
- Reheated leftovers should steam back to 145°F and be eaten within 3–4 days.
Frequently asked questions
How long do you steam blue crabs?
Steam blue crabs for about 25 minutes per dozen: this calculator uses 22 + 0.25 × the number of crabs, so a dozen (12) takes 25 minutes. Layer them in a steamer over boiling salted water with seasoning between layers (Maryland-style), cover, and don't lift the lid. Start timing once the pot returns to a full head of steam.
How long does a 2 lb Dungeness crab take to steam?
About 20 minutes: this calculator uses 16 + 2 × weight in pounds, so a 2 lb Dungeness steams for 20 minutes. Put it belly-down in a tall pot over 2 inches of boiling salted water, cover, and time from when full steam returns. The shell should be bright orange-red and the thickest body meat 145°F (63°C) when done.
Is snow crab already cooked when you buy it?
Usually yes. Snow crab clusters are almost always cooked aboard the fishing vessel, then frozen — so "cooking" them at home is really reheating. Steam raw clusters for about 8 + 1 × pounds (a 2 lb bag takes 10 minutes); if yours are the standard precooked frozen clusters, steam just until heated through, about 5 + 0.75 × pounds (around 7 minutes for 2 lb).
How long do you cook king crab legs?
King crab legs are sold precooked and frozen, so cook them gently to reheat: steam 2 lb for about 7 minutes (model: 5 + 0.75 × pounds), boil briefly for 5 minutes, or bake at 350°F for about 12 minutes. The goal is steaming-hot meat at 145°F (63°C) — a hard boil will make precooked legs rubbery.
Do whole crabs take longer than legs or clusters?
Yes — legs and clusters cook about 25% faster than a whole crab of the same species because the shell is thinner and heat reaches the meat directly. For example, a 2 lb Dungeness crab takes 20 minutes whole but only about 15 minutes as legs and clusters. This tool's Whole vs legs tab shows both times side by side.
How do you know when crab is done?
The most reliable test is a thermometer: the thickest body or leg meat should read 145°F (63°C), the FDA-recommended temperature for seafood. Visual cues help too — the shell turns bright red-orange and the meat is opaque white and flaky, never translucent. Use this tool's Doneness check tab to interpret any reading.
How long do you boil crab?
Boil times by type: blue crab about 16 minutes per dozen (15 + 0.1 × crabs), Dungeness about 18 minutes for 2 lb (14 + 2 × pounds), raw snow crab clusters about 7 minutes for 2 lb, and precooked king crab legs just 5 minutes for 2 lb as a gentle reheat. Start timing when the water returns to a full rolling boil.
Can you bake or grill crab?
Yes. Bake split blue crab or whole Dungeness at 425°F (about 17–18 minutes for a standard batch) or legs and claws at 400–350°F. Grill halved whole crabs flesh-side down: about 6 minutes per side for blue crab and 7 minutes per side for a 2 lb Dungeness. Bake king crab legs at 350°F for about 12 minutes per 2 lb. Legs do especially well on the grill wrapped in foil with butter.
Can you cook frozen crab legs?
Yes — king and snow crab legs can go into the pot from frozen; the times in this calculator assume thawed legs, so add roughly 50% more time (a 2 lb bag of king legs steams about 10–11 minutes from frozen instead of 7). For the best texture, thaw overnight in the refrigerator: about 8–10 hours per 1–2 lb. Never thaw at room temperature.
How much crab do I need per person?
Plan on 1 dozen medium blue crabs per person (they're mostly picking work), 1–1.5 lb of whole Dungeness, ¾–1 lb of snow or king crab legs, or ¾ lb of stone crab claws. Cooked-meat yield is roughly 14% for blue crab, 25% for Dungeness, and 50–60% for snow and king crab legs.
How much salt goes in crab boil water?
Use about ½ cup of non-iodized (kosher or sea) salt per gallon of water — less salty than seawater but enough to season the meat. Allow roughly 3 quarts of water per dozen blue crabs or per 2 lb of Dungeness so the pot isn't crowded. For steaming, use 2 inches of water in the pot with a couple of tablespoons of salt.
What's the difference between Maryland-style steaming and a Louisiana boil?
It's about how seasoning reaches the crab. Maryland-style steams blue crabs over water, dusting each layer with dry seasoning, which keeps the meat sweet and the seasoning on the shell you pick through. A Louisiana boil submerges everything — crab, corn, potatoes, sausage — in heavily seasoned water, so the flavor penetrates the meat itself. Both cook in similar times; choose by flavor preference, not speed.
Is this calculator only for crab?
Yes — this tool is for crab only: blue crab, Dungeness, snow crab, king crab and stone crab claws. Each protein has its own time curves, so crab times don't transfer to lobster or shrimp. For other proteins use our lobster cook time calculator, shrimp cook time calculator, salmon cook time calculator, chicken cook time calculator, pork cook time calculator, lamb cook time calculator, crawfish boil calculator, or steak cook time calculator.
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