Scope. This page provides a controlled reader-run protocol and does not claim site-run measurements. For cooking, cooling, storage and reheating, follow the current official guidance linked on the page.
Open any cookbook you own and count the temperature instructions. Not the oven settings, the hob ones. You will find gentle heat, medium-low, a bare simmer, barely trembling, until it just coats the back of a spoon, do not let it boil. Six instructions, six adverbs, zero numbers. The writer knew exactly what they meant. The instruction carries almost none of it across to your kitchen.
That gap is the whole reason this site exists. The useful information in cooking is very often the information recipes systematically decline to print: what temperature, how wide the margin is, and the point at which the dish stops being the dish. Before any of that can be published usefully, a reader needs a coarse map. Four bands is that map.
Why every recipe you have read is written in adverbs
There are two honest reasons recipe writers avoid numbers, and one dishonest one.
The first honest reason is that home equipment varies enormously. A recipe developed on a professional gas range behaves differently on a domestic induction hob, which behaves differently again on an electric radiant plate that keeps delivering heat for a minute after you turn it down. A writer who prints a dial setting is printing a number that is true in exactly one kitchen. How to measure it on your own hob is in what medium-low actually measures on your hob, and the spread between appliances is the single strongest argument for adverbs.
The second honest reason is that a lot of cooking genuinely is controlled by watching rather than probing. An experienced cook reads the surface, the drag on the spoon and the smell, and gets there faster than someone waiting for a probe to settle.
The dishonest reason is that measuring is work, and an adverb is free. "Gentle heat" cannot be wrong. It also cannot be checked, cannot be transferred, and cannot teach you anything the next time it fails.
Four bands do not replace the adverbs. They give you somewhere to stand while you learn what the adverbs meant.
The four bands
Cooking temperature is a continuum. We divide it into four working bands because most of the decisions a home cook makes are decisions about which band to be in, and because the interesting failures happen at the boundaries.
| Band | Range | What it is for | What it ruins |
|---|---|---|---|
| 1 | Below 60°C (below 140°F) | Setting slowly, holding, extracting into fat or liquid | Nothing quickly; the risk here is time, not heat |
| 2 | 60–70°C (140–158°F) | Proteins that have a narrow correct state: eggs, fish, tender cuts | Expensive ingredients, within seconds of the top of the band |
| 3 | 70–85°C (158–185°F) | Collagen conversion, starch behaviour, the true working range of a braise | Lean muscle, dairy sauces, anything you wanted to stay tender |
| 4 | 85–100°C (185–212°F) | Agitation, speed, hydration, extraction under pressure of time | Emulsions, clarity, delicate texture, most of what this site covers |
The Fahrenheit figures above are arithmetic conversions of the Celsius boundaries, not separate measurements. Celsius is canonical on this site.
Band 1 — below 60°C (below 140°F): setting, holding, infusing
This is the band most home cooks have never deliberately visited. Changes tend to be gradual rather than dramatic. The exact behaviour depends on the ingredient, so individual articles set out how to measure it rather than this framing page claiming a universal protein threshold.
Its three jobs are setting slowly, holding, and extraction.
Signature dish: a butter emulsion held through a meal. An emulsified butter sauce made ahead and kept warm until it is needed is the clearest demonstration of band 1 as a holding band. The sauce is not cooking. It is being kept in the narrow condition where the fat stays suspended and the sauce stays pourable. Push it up out of the band and the emulsion gives up. Measure and record the holding range and break temperature on your own setup.
The thing band 1 gets wrong is time. Cooking slowly is not the same as cooking safely, and low-temperature work is exactly where the time-and-temperature question stops being a matter of texture. That subject gets its own sourced treatment on the site and no invented figures anywhere.
Band 2 — 60–70°C (140–158°F): where expensive ingredients are won or lost
If you only ever learn one band, learn this one. It is narrow, it is where most proteins arrive at the state you actually wanted, and it is where a fillet that cost as much as the rest of dinner turns from translucent and yielding into opaque and dry with very little warning.
Egg and fish textures change progressively rather than flipping from raw to cooked at one magic number. That is the proposition tested in the same eggs at eight temperatures and the fish ladder; this page does not assign universal molecular set points.
Signature dish: a thick fish fillet, cooked gently and pulled on a number. The whole argument of the site fits in one fillet. There is a target, there is a window either side of it, and there is a temperature above which the texture changes irreversibly. Measure and record all three per species and thickness; this page supplies no universal values.
The reason this band is dangerous is that it is thin and the food is often thin too. A fillet has very little thermal mass, so the centre moves quickly, and it keeps moving after you take it off the heat. That effect is large enough to eat the entire window on its own, which is why it has its own page, carryover cooking.
Band 3 — 70–85°C (158–185°F): collagen, starch, and most braises
Here the logic inverts. In band 2, more heat costs you texture. In band 3, more time buys it back, because the dominant process stops being protein contraction and starts being the conversion of connective tissue into gelatine.
Two clocks run at once. Muscle fibres continue to contract and squeeze out moisture. Collagen continues to break down and turn a tough cut succulent. The art of a braise is winning the second race by more than you lose the first, and the temperature you hold decides the ratio between them. Held too high, the fibres finish long before the collagen does, and eight hours of patience produces meat that is technically tender and eats dry.
Thickeners are not interchangeable at the same quantity and heat. Thickeners compared treats those differences as recipe-level measurements rather than universal activation numbers.
Signature dish: beef shin, braised. Cheap cut, long clock, enormous transformation, and a result that is entirely decided by a liquid temperature almost nobody measures. Most home braises labelled "gentle" are running well above this band, because the oven setting that produces a visible simmer under a lid is higher than the setting that produces the right one. Record the liquid temperature at each oven setting you test.
Band 4 — 85–100°C (185–212°F): what a boil is genuinely for
At the top of the scale, temperature stops being the main variable and agitation takes over. The gap in degrees between a bare simmer and a rolling boil is small. The mechanical difference between them is not small at all: one is still water with occasional bubbles, the other is a machine for physically knocking food apart and driving fat into liquid.
That is a problem for almost everything this site covers, and it is exactly right for a short list of jobs: cooking pasta, blanching vegetables where speed preserves colour, reducing a liquid where you want water gone quickly, and getting a large volume up to temperature. We separate the four distinct damages in why a rolling boil causes four separate problems, along with the honest list of what it does better than anything else.
Signature dish: green vegetables blanched hard and fast. A genuine band 4 job. Volume of water, recovery temperature after the vegetables go in, and total time are what decide the result, and none of them are usually stated in a recipe.
The upper bound of this band is not fixed across kitchens. USDA FSIS explains that water boils at lower temperatures as elevation rises, which is why the boiling-point calibration check uses an altitude-appropriate reference rather than one assumed number.
The boundaries are a working simplification
Every band edge above is a convenience. Nothing in food changes state at exactly 60°C or exactly 85°C because the number is round. Proteins denature across ranges, those ranges overlap, and they shift with pH, salt concentration, fat content and how long the food has been held.
So take the bands as a place to start a sentence, never as a citation. When you need the actual figure for an actual ingredient, take it from a measurement with a log or from a named, dated source; how to read the Temperature Ladder explains how each is labelled, measured or cited. The bands are the map. The figures are the survey.
Where credible sources disagree about a set point, we publish the disagreement with both citations rather than picking the number we prefer. There is more of that in food science than the confident tone of most cooking writing would suggest.
Why we publish a failure temperature
Most cooking references stop at a target. A target on its own is close to useless, because it tells you where to aim without telling you how badly you can miss.
A Heat Spec on this site asks for three numbers instead of one:
- The target — where the dish is at its best.
- The doneness window — the range either side of the target where the result is still good, expressed in degrees.
- The failure temperature — the point at which the dish stops working and cannot be recovered.
The third is the one that changes how you cook. A window that is generous means you can stop watching and go and do something else. A window that is tight means you stand there with a probe. Knowing which situation you are in before you start is worth more than knowing the target, and it is the number that nobody publishes.
How to find these bands on your own equipment
You do not need to buy anything to locate the four bands in your own kitchen, beyond a probe thermometer you trust. If you own one already, check it first, because an instrument you have never verified turns every number you take into a guess. That takes two checks and about five minutes.
Then run this, once:
- Put a modest depth of water in the pan you actually use most, and bring it to a full rolling boil. Look at it properly. That is the top of band 4.
- Turn the heat down in small steps, waiting several minutes at each one for the pan to settle, and probe the water each time. Note the dial position where the surface stops breaking and only occasionally releases a bubble. That is the bottom of band 4, and it is much lower on the dial than most people expect.
- Keep stepping down. Note the dial position where the probe sits in the middle of band 3, and again in band 2. On many hobs one of these positions falls between two dial detents, which is itself a useful thing to discover.
- Write the dial positions on a card and stick it where you cook.
Two things usually surprise people. The first is how low the setting for a bare simmer is. The second is that on some hobs, particularly induction at its lowest settings, the number will not hold still, because the appliance cycles full power on and off rather than delivering steady low power. That behaviour is real and measurable, and the hob comparison covers it.
In Plain English
The four bands are a rough map of cooking temperature, split at the points where the chemistry changes what your effort buys you.
- Below 60°C (140°F) is for holding things steady and pulling flavour out slowly. Nothing much happens fast.
- 60–70°C (140–158°F) is where eggs, fish and tender cuts arrive at the state you wanted, and where an expensive ingredient is ruined in seconds.
- 70–85°C (158–185°F) is where tough cuts become tender and thickeners do their work. Time helps here. Extra heat does not.
- 85–100°C (185–212°F) is for pasta, blanching and reduction, and it is destructive to nearly everything else because of the agitation rather than the temperature.
This helps you if you can already cook but cannot predict your own results. The moment to use it is before you start, when you decide which band the dish belongs in and therefore whether you are going to stand over it with a probe or leave it alone for four hours. What to do next is the exercise above: find the four bands on your own hob and write the dial positions down. Everything else on this site becomes usable once you have.
The bands themselves are deliberately coarse. They exist so that the precise figures have somewhere to live.
Where to go from here
Start with the free fridge-door temperature card. It is a single page, it lives on the front of the fridge, and it carries the bands, the signature jobs of each and the space to write in your own hob's dial positions. It is ungated and always will be. How to read the Temperature Ladder explains how any precise figure on this site must be labelled.
If you would rather browse than print, everything in this section covers hobs, holding, carryover and the rest of the heat fundamentals in order.