Lobster Cook Time Calculator
Exact cooking times for lobster only — whole live lobsters and lobster tails, by weight, for boiling, steaming, grilling, and broiling. Includes a doneness checker, thawing guide, and a full time chart. This tool covers lobster only — for other proteins see our salmon cook time calculator.
Timing starts when the water returns to a full rolling boil after you add the lobster. Use the lobster's individual weight, not the total weight of all lobsters in the pot.
Steam over 2 inches of boiling salted water in a covered pot. Do not lift the lid — every peek lets the steam out and adds minutes.
Lobster is done when the thickest meat reaches 140°F (60°C) — pull it at 140°F and rest 3–5 minutes; residual heat carries it to ~145°F (63°C). Also check the visual cues: bright red shell, meat opaque white (not translucent).
How the cooking-time model works
This calculator is built from published lobster-cooking time tables (seafood processors and culinary sources) reduced to simple rules:
- Boil: 7.5 minutes per pound up to 2 lb (1 lb → 8 min, 1.5 lb → 12 min, 2 lb → 15 min), then +10 minutes per extra pound above 2 lb (2.5 lb → 20 min, 3 lb → 25 min). This matches the standard boil charts: 8 / 9–10 / 11–12 / 12–13 / 15 / 20 / 25 minutes.
- Steam: 10 minutes per pound, rounded up (1.5 lb → 15 min, 2 lb → 20 min). Published steam charts run 10 / 12 / 14 / 16 / 18 / 22 / 25–30 minutes — the 10-min/lb rule sits in the middle of that range.
- Grill/broil tails: about 1–2 minutes per ounce (we use 1.25), split across both sides. Bake tails at 425°F: about 1.5 minutes per ounce. Both target a 140°F pull temperature.
Always round cooking time up to the whole minute — lobster meat is lean and a minute short of fully opaque is worse than a minute of rest.
Lobster cooking time chart
| Lobster weight | Boil | Steam |
|---|---|---|
| 1 lb | 8 min | 10 min |
| 1¼ lb | 10 min | 13 min |
| 1½ lb | 12 min | 15 min |
| 1¾ lb | 14 min | 18 min |
| 2 lb | 15 min | 20 min |
| 2½ lb | 20 min | 25 min |
| 3 lb | 25 min | 30 min |
| Tail weight | Grill / broil (total) | Grill / broil (per side) | Bake 425°F (total) |
|---|---|---|---|
| 4 oz | 5 min | ≈2.5 min | 6 min |
| 6 oz | 8 min | 4 min | 9 min |
| 8 oz | 10 min | 5 min | 12 min |
| 10 oz | 13 min | ≈6.5 min | 15 min |
| 12 oz | 15 min | ≈7.5 min | 18 min |
Thawing guide
- Fridge (best): 24 hours per pound of lobster. A 1.5 lb lobster needs about 36 hours in the refrigerator.
- Cold water (faster): sealed in a plastic bag, submerged in cold water, changing the water every 30 minutes — roughly 30 minutes per pound.
- Never thaw at room temperature, and never boil or steam a whole lobster from frozen — the outside overcooks long before the center is done. Tails can go straight onto a hot grill from frozen only in a pinch, adding ~50% more time.
Worked example: boiling a 1.5 lb lobster, step by step
- Water: allow about 3 quarts of water per 1½–2 lb of lobster. For one 1.5 lb lobster, fill a stockpot with roughly 3 quarts (12 cups) of water.
- Salt: salt like the sea — about ¼ cup (4 tablespoons) of sea salt per gallon of water. For 3 quarts that's 3 tablespoons.
- Boil first: bring to a full rolling boil. Timing starts only after the water returns to a boil once the lobster goes in — the cold lobster drops the water temperature.
- Time: 1.5 lb × 7.5 min/lb = 11.25 minutes → round up to 12 minutes. Plunge the lobster in headfirst, head down, claws banded on.
- Check: shell bright red, antennae pull out easily, thickest tail meat opaque white. If in doubt, check 140°F with an instant-read thermometer.
- Rest: 5 minutes on a rack or tray before cracking — the meat firms up and finishes cooking gently.
Do the same math for any weight: boil minutes = ceil(weight × 7.5) up to 2 lb; above 2 lb add 10 minutes per extra pound (a 2.5 lb lobster boils 20 minutes).
Food safety disclaimer
Frequently asked questions
How long do you boil lobster per pound?
Boil lobster for about 7–8 minutes per pound up to 2 lb: 1 lb → 8 minutes, 1.5 lb → 12 minutes, 2 lb → 15 minutes. Above 2 lb, add 10 minutes per extra pound (2.5 lb → 20 min, 3 lb → 25 min). Timing starts when the water returns to a full rolling boil after the lobster goes in.
How long do you steam lobster per pound?
Steam lobster for about 10 minutes per pound, rounded up: a 1 lb lobster takes 10 minutes, 1.5 lb takes 15 minutes, and 2 lb takes 20 minutes. Steam over 2 inches of boiling salted water in a covered pot, and don't lift the lid — every peek adds minutes.
How long do you grill a lobster tail per ounce?
Grill or broil lobster tails for about 1–2 minutes per ounce of total tail weight (this tool uses 1.25 min/oz), split across both sides. A 6 oz tail grills about 8 minutes total — roughly 4 minutes per side. Bake tails at 425°F for about 1.5 minutes per ounce.
What internal temperature is lobster done at?
Lobster is done when the thickest part of the meat reaches 140°F (60°C). Pull it at 140°F and rest 3–5 minutes — residual heat carries it to about 145°F (63°C), the FDA-recommended temperature for seafood. Visual cues: bright red shell and opaque white (not translucent) meat.
How do you know when a whole boiled lobster is done?
Three signs: the shell turns bright red, the meat in the thickest part of the tail is opaque white (not translucent), and the antennae or small legs pull out easily. The most reliable test is a thermometer: 140°F in the thickest meat, then rest to ~145°F.
Is it better to boil or steam lobster?
Boiling is faster (7.5 min/lb vs 10 min/lb for steaming). Steaming keeps the meat slightly more tender and flavorful because less salt and flavor compounds leach into the water. For the purest lobster sweetness, steam; for the fastest dinner, boil.
How long does it take to thaw a frozen lobster?
Thaw in the refrigerator for 24 hours per pound — a 1.5 lb lobster needs about 36 hours. For a faster thaw, seal it in a plastic bag and submerge in cold water, changing the water every 30 minutes (about 30 minutes per pound). Never thaw at room temperature.
Can you cook a lobster from frozen?
Do not boil or steam a whole lobster from frozen — the outside overcooks before the center is done. Thaw first (fridge 24 h/lb). Lobster tails are the exception: in a pinch, tails can go straight onto a hot grill from frozen, adding about 50% more cooking time.
Why is my lobster rubbery?
Rubbery lobster is almost always overcooked. Lobster meat is very lean and toughens fast past 145°F internal temperature. The other common cause is cooking a lobster that wasn't fully thawed — the outside overcooks while the inside finishes. Use a thermometer and pull at 140°F.
How long should lobster rest after cooking?
Rest a whole cooked lobster for 5 minutes before cracking — the meat firms up and finishes cooking gently from residual heat. Lobster tails need 3–5 minutes of rest after grilling or baking before serving.
How much salt do you put in lobster boil water?
Salt the water like the sea: about ¼ cup (4 tablespoons) of sea salt per gallon of water. Allow about 3 quarts of water per 1½–2 lb of lobster so the pot isn't crowded.
Is this calculator for other seafood too?
No — this tool is for lobster only. Lobster has its own weight-to-time curves that don't transfer to other proteins. For salmon, use our salmon cook time calculator.
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