How to Roast Coffee Beans at Home – The Home Coffee Roasting Guide

How to Roast Coffee Beans at Home – The Home Coffee Roasting Guide

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Do you ever marvel how coffee beans get roasted? Would you want to achieve extra satisfaction out of your morning coffee? Learning in regards to the coffee roasting course of will allow you to roast and brew the specified coffee of your alternative. Coffee with the precise diploma of sweetness or bitterness of your alternative. This article on tips on how to roast coffee beans at house is for all coffee drinkers, particularly new coffee connoisseurs that simply joined the membership. But earlier than we dive deeper, let’s first remind ourselves of some staple items about coffee.

Green Coffee Fruit

Coffee is a inexperienced fruit that grows on the Coffea tree. It is cultivated and harvested on a plantation and handed by way of a sequence of processes earlier than it’s packaged and bought out to the general public. These processes embody pulping, fermentation, drying, hulling, grading, and eventually, roasting. These steps are important, however the roasting high quality dramatically impacts the style of the coffee. It has extra to say in regards to the flavour of your brews.

Roast Coffee Beans At Home

And because of this, some devoted coffee drinkers love to purchase processed coffee beans and roast them themselves. There are testimonies of inexperienced persons who tried it with one trial’s intention and now favor to roast their coffee by themselves. So, as you see, coffee roasting isn’t only for the intense coffee connoisseurs, it may be completed by anybody. So for those who’re able to roast some scrumptious coffee, stick round and keep it up with our coffee roasting information. Now, let’s get to it.

What occurs throughout coffee roasting?

Coffee roasting is a course of that takes a couple of minutes, however inside this quick time period, the beans bear a lot of bodily and chemical modifications. The stage at which these modifications are stopped will decide the ensuing taste of the coffee bean. Therefore, it’s crucial that each one coffee roasters, particularly these trying ahead to roasting coffee beans at house, perceive the reactions that happen when coffee beans are uncovered to excessive temperatures.

Industrial Coffee Roaster

The first noticeable transformation is browning, the change within the coffee beans’ color from Green to Brown. This conversion occurs attributable to a course of generally known as the Maillard response. Maillard response happens if you warmth your coffee beans to 150⁰C/302⁰F wherein the beans launch a chemical generally known as melanoidin that’s accountable for the color transformation. In some instances, there could also be a slight yellow color earlier than it lastly crosses to Brown. It’s believed {that a} shorter Maillard response will lead to tasty coffee.

The bean’s look just isn’t the one factor that modifications. Its mass and quantity are additionally affected. Coffee beans at all times expertise a lower in mass every time they’re roasted. According to specialists, about 12-20% of bean weight is misplaced after roasting, the water within the coffee bean is transformed into gasoline growing the bean’s quantity. The quantity increment happens attributable to pressurized gasoline inside its partitions. This huge inside strain additionally forces out the oils from the centre of the cells into the beans’ surfaces.

Roasted Coffee Beans

There are simply as many invisible reactions as there are bodily modifications, and all these transformations work in the direction of bettering the coffee flavour, so long as the coffee isn’t overdone and burnt. The most important chemical response is Cameralization, and it’s the course of that converts natural sugar into caramels, also referred to as sticky brown sugar. Another response known as the Strecker degradation, and it’s in control of the candy aroma of your coffee.

Stages of Coffee Roasting

Stages of coffee bean

The query of “tips on how to roast coffee beans at house” may also require us to look at coffee roasting phases. There are totally different approaches to this facet, however all say the identical factor. In our case, we wish to hold it easy and easy. The following are the 5 phases of Coffee roasting.

Drying (Raw Green Beans)

Raw coffee beans

This stage could be divided into inexperienced, yellow, and steam phases. The purpose being that it’s the stage wherein the coffee experiences color modifications and evaporation. The drying stage is when the coffee beans are uncovered to sizzling temperatures and start the roasting course of. As the beans get hotter, the color modifications from inexperienced to yellow and heads towards the ultimate brown color. Also, the water within the beans is transformed into gases.

Roast on this stage: No roast at this stage. 


As the coffee beans are saved on the fireplace and constantly stirred to stop burning they bear fixed warmth circulation, as they shortly attain the browning stage. Aside from color transformation, that is the stage wherein the coffee’s inside core turns into pressurized by gasoline. The beans begin making a cracking sound as they begin to attain their full capability, signifying the cracking stage.

Roast on this stage: No roast at this stage.

First crack (Light Roast)

light roast

This is the half the place the chemical modifications start to happen. The sugars begin to caramelize because the cracking sound persists. This cracking sound is much like that of popcorn. Some individuals could select to cease roasting at this stage in the event that they love bitter coffee. However, those that don’t will hold roasting to maneuver from the sunshine roast to the medium roast.

Roast on this stage: Light City, Half City, Cinnamon Roast

Roast improvement (Medium Roast)

medium roast

The improvement stage entails the town roast and the town plus roast. In the event stage, the sugar continues to caramelize in order that the coffee reaches the height of its sweetest flavour within the metropolis plus roast. It additionally darkens in color and begins to crack once more on the finish of the event phases.

Roast on this stage: City Roast and City Plus Roast

Second crack (Medium Dark – Dark Roast)

medium dark roast

Coffee beans are stated to have reached the complete metropolis roast the second they provide out the second crack. The second crack serves as a warning to stop your coffee beans from getting burnt. It offers a violent sound for roasters to shortly put out the warmth supply. However, the beans nonetheless keep a scrumptious style on the full metropolis roast phases. The coffee bean will start to acquire oil on its floor throughout this stage.

Roast on this stage: Full City Roast, Full City Plus Roast

Darkening (Dark Roast)

dark roast

After this stage, there’s a darkish roast that results in the burning of the beans. The darker roasts are also referred to as French roasts, they usually mark the interval the place the beans begin to give a pungent odor because of the extreme burning of the sugar, however the style just isn’t but affected. The beans floor begins to shine because it’s oily floor turns into evident. Continuing to roast previous this stage will lead to burnt coffee beans, the aroma and the flavour can be undesirable.

Roast on this stage: French Roast, Espresso Roast, Italian Roast


Roasting the coffee beans doesn’t full the entire course of. You nonetheless have to chill off, degas, and retailer them. Immediately after roasting, the subsequent factor is to switch the roasted coffee beans right into a metallic colander (the plastic ones will soften when making contact with the roast). You can depart the recent coffee beans to chill off for some time, or you’ll be able to quicken the cooling course of by frequently transferring them between two colanders.

The transferring of the coffee beans between two colanders may also assist take away the beans’ husks. After roasting, there can be some messy husks on the beans that have to be eliminated. However, you don’t have to take away all, simply strive your finest to take away as many as doable. The subsequent phases of house coffee roasting are Degassing and Storage.

Roasted coffee

There are over 800 chemical reactions that happen throughout coffee roasting of which carbon dioxide gasoline is among the outcomes, and it’s in control of the crema and refreshing style of the coffee. However, this substance should be obtainable in the best amount; much less of it should stale the coffee and an excessive amount of of it should make your coffee bubble and style bitter. Therefore, there’s a necessity for degassing earlier than storage.

Storage, however, can be completed specifically. The coffee beans should be saved in an air-tight surroundings that’s not uncovered to daylight. This is to maintain sufficient CO2 within the storage container and forestall the oxidation of the beans. Therefore, you could guarantee high quality storage to maintain your beans contemporary for an prolonged interval. Before we transfer on to the degassing and storage a part of this text, let’s check out the assorted methods on tips on how to roast your coffee beans at house.

Getting Started (What that you must think about earlier than roasting)

Now, let’s proceed by trying on the issues that you must think about earlier than roasting your coffee. These are the obligatory stuff that should be in place earlier than you begin roasting your coffee beans at house. They are;

Green Coffee Beans

There isn’t any roasting with out inexperienced coffee beans. So buying a provide of inexperienced coffee beans earlier than is a should earlier than you’ll be able to transfer ahead with your house roasting expertise. The difficult a part of that is that the inexperienced beans usually are not available just like the roasted ones. Most retailers like coping with roasted beans. The best choice is to contemplate making a cope with a wholesaler.

Green Beans to Roast Coffee Beans at Home

Another manner out is to buy your inexperienced beans on-line.  There are inexperienced coffee sellers on the web that can ship them to the doorstep. One of them is Sweet Marias, an organization that offers in uncooked coffee produced in Ethiopia, Kenya, Costa Rica, and so on. They additionally promote in smaller portions and at reasonably priced costs.


Let’s transfer on to the principle tools required for coffee roasting. Getting a house coffee roaster is the only option that can present a stress-free roasting expertise.

Home Roaster to Roast Coffee Beans at Home

However, we will additionally make use of available house tools if we’re on a funds. These options embody the usage of a pan, oven, Popcorn popper, and a stovetop popcorn maker. If you’ve any of those in your kitchen, you might be good to go. Just stick with us as we’ll educate you tips on how to use them within the subsequent part of the article.


Unless you might be roasting small batches for single consumption, you have to to look right into a storage technique that can hold your coffee beans contemporary and attractive for weeks on finish. So how do you retain your coffee beans tasting contemporary? By maintaining them in an air-tight surroundings that stops the influx of oxygen and permits the venting of CO2. A one-way valve container is ideal, and you may as well buy these coffee vaults, coffee canister, and-tight meals dispensers which are obtainable on Amazon.

Home Roasting Methods

The second you’ve been ready for has lastly come. It’s now time to make use of what you’ve at hand to roast your inexperienced coffee beans. Just make your self snug; this information will offer you all the main points to roast coffee beans at house, together with the required supplies for each technique.

Roast Coffee Beans at Home with a Home Coffee Roaster

Let’s go from the best to the difficult ones. Unlike in historical instances, we now have machines which are constructed explicitly for roasting inexperienced coffee beans at house. They work equally to the popcorn machine, blowing sizzling air over coffee beans at an unimaginable velocity. The house coffee roasters are available numerous sizes and are priced pretty since there are lots of producers. It’s positively an ideal funding for those who’re trying into entering into house coffee roasting as a result of the machines deal with the aggravating elements of the work.

Materials wanted:

  • A house coffee roaster
  • Unroasted coffee beans
  • Two colanders
  • A pair of oven mitts

Roasting course of:

The first step to roasting your beans is to fill your machine with a exact amount of beans. You can get to know the precise measurement by consulting the person handbook.

The subsequent factor is to change on the machine and observe by way of the roasting phases, from gentle roast to medium, and eventually to darkish roast. All of those ought to take a couple of minutes, and it is best to shortly flip it off the second it reaches your required roast color. 

As coffee roasting is worried, the distinction between a great and a awful roast is only a matter of some minutes. Therefore, you should be cautious of the phases to get it proper.

The two colanders are for cooling the roasted coffee and eradicating the husk. Make certain to make use of a pair of oven mitts when dealing with the colanders to stop any probabilities of getting burnt.

Make certain to degas the beans for about 12 hours after the roast.

The Pros and Cons of Roasting Coffee Beans with a Home Coffee Roaster:


  • The most secure approach to roast coffee beans.
  • Easiest coffee roasting technique.
  • Cleanest coffee roasting technique.

  • Expensive.
  • Roaster takes up extra space.

Roast Coffee Beans at Home with a Popcorn Maker

The popcorn popper is one other machine to scale back the heavy lifting work of roasting coffee beans. It’s additionally a greater approach to expertise the coffee roasting phases and observe the bodily reactions. The working precept of the popper is much like that of the roaster, the blowing of fast-moving air over the coffee beans. The solely con of utilizing this technique is that it could cut back the lifespan of the popcorn popper.

Please take into accout: When utilizing a popcorn maker to roast coffee, you may be voiding your guarantee. Roasting coffee will take a toll in your machine and should break down your popper after a number of months of utilization. Make certain your popper dispenses warmth all through the chamber and never simply from the underside for this offers you an uneven roast and should trigger a hearth. Never depart the popcorn maker unattended throughout a roast.

Materials want:

  • A popcorn maker machine
  • Unroasted coffee beans
  • Two colanders
  • Heatproof spoon (wood)
  • A cup
  • A pair of oven mitts

Roasting course of:

You start the roasting by first heating this machine for 30 seconds. Make certain you might be utilizing the popper in a well-ventilated space.

After this, put ½ cup of coffee beans into the popper. Make certain that the beans can transfer freely. Use the wood spoon to agitate the beans in order that they will start to maneuver.

Then, you let the heating proceed for 3 minutes and watch the beans transit from one stage to the opposite. Listen and watch fastidiously, for a light-weight roast it is best to hear your “first crack” at about 3 to five minutes. At about 6 to eight minutes it is best to encounter the “second crack” which can be your medium roast. A minute or two after, you may be on the Medium Dark – Dark roast territory.

Be on the alert to show off the machine as quickly because it reaches your required roast. 

The subsequent factor is to switch the roasted beans between the 2 metallic colanders to chill and de husk them concurrently, don’t overlook to putt in your mitts!

Let the roasted coffee beans degas for about 12 hours and retailer them correctly.

Pros and Cons of Roasting Coffee Beans with a Popcorn Machine


  • Easy to make use of.
  • Easy to realize the specified roast.

  • Roasting takes a toll on the machine.
  • May break after a number of roasts.

Roast Coffee Beans at Home with a Stovetop Popcorn Maker

Using a stovetop popcorn technique is among the conventional methods of roasting coffee beans at house. A stovetop popcorn maker is a pot-like machine with a crank within the prime that’s linked to a blade that stirs the corns. The machine is heated by being positioned on a stovetop or into an oven. This technique’s cons are that your beans can simply get burnt, and issues will definitely be smoky. You ought to carry out this technique outdoors your home, within the open-roof for air flow.

Materials wanted:

  • A stovetop popcorn maker- The Whirley is the perfect.
  • Unroasted coffee beans
  • A laser thermometer (non-obligatory)
  • Two metallic colanders
  • A range or sizzling plate.
  • A pair of oven mitts

Roasting course of:

When the desk is ready, and you’ve got organized the best spot outside. The first step is to preheat your stovetop to a temperature studying of 500 levels on the laser thermometer. But if there isn’t any thermometer, simply warmth the popper for five minutes. 

Next, add your coffee beans, ½ cup as typical. Now is the time for cranking, and that is completed to flow into the warmth quicker.

The final roasting step is to observe the transition of phases from the sunshine to darkish roast and cease on the level that offers you your required roast. Also, notice that the process can be carried out indoors, however the room should be extremely ventilated.

Don’t overlook to make use of the 2 colanders and oven mitts to take away the chaffs.

Pros and Cons of Roasting Coffee Beans with a Stovetop Popcorn Maker


  • Easy.
  • Can obtain nice outcomes.

  • Beans can burn simply.
  • It can get actually smoky.

Roast Coffee Beans at Home with an Oven

The oven is one other machine that can be utilized for roasting coffee beans. Be ready to cope with smoke if you’re contemplating this technique. Besides, the recent air blasting ovens usually are not appropriate for this sort of experiment as a result of they are going to drastically improve the temperature of the room and get issues messy. 

Materials wanted:

  • An oven
  • Unroasted coffee beans
  • A laser thermometer (non-obligatory)
  • Perforated baking trays or regular baking trays with a baking sheet
  • Two metallic colanders
  • A pair of oven mitts

Roasting course of:

The very first thing is to warmth the oven to a temperature of 500⁰F, after which place the coffee beans on the tray. You then place the tray on the oven’s center rack part, giving it a constant warmth.

The tray is to be given a shake often to get all of the coffee beans evenly heated. This ought to go on for about 5 minutes until the primary crack is heard, a minute later and the second crack will observe.

Keep an eye fixed on the tray and pull it out if you attain your required roast color. The cooling and chaffering course of stays the identical.

Pros and Cons of Roasting Coffee Beans with an Oven


  • Can be completed with minimal tools.
  • No want for added purchases.

  • Slow roasting technique.
  • Hard to realize correct outcomes.
  • Can get very smoky.

Roast Coffee Beans at Home with a Pan

Almost each home has a free pan mendacity round, and subsequently, this technique is frequent amongst house coffee roasters. However, it’s probably the most tough to make use of as a result of it’s extraordinarily simple for the coffee beans to get overcooked and smoky.

Strictly keep away from utilizing pans which are coated or have a non-stick floor, for this can negatively impression the flavour of your coffee roast.

Material wanted:

  • A thick pan
  • A range or a conveyable sizzling plate
  • A laser thermometer (non-obligatory)
  • Two metallic colander
  • A stick or wood spatula
  • A pair of oven mitts

Roasting course of:

If you’ve a conveyable sizzling plate and have the choice of roasting in your yard then we extremely suggest it. If not, you’ll be able to nonetheless do it indoors offered that there’s air flow within the room.

Begin the method by preheating the pan to a temperature of 450⁰F; the thermometer can be useful right here. Then, place the coffee beans onto the pan.

The quantity of the beans will rely on the floor space and depth of the pan. Just be sure that warmth can simply flow into all through the beans, and you may stir the beans nicely.

The subsequent step is to maintain agitating the beans with the spatula in order that they roast evenly. In 4-5 minutes, the beans will give the primary crack and attain the darkish roast a minute after.

So hear fastidiously and hold an in depth eye on them. Once you reached your required roast, cool them off with the 2 metallic colanders. Make certain you might be carrying your oven mitts.

Pros and Cons of Roasting Coffee Beans with a Pan


  • Fast.
  • No want for added tools.

  • Can burn your coffee beans simply.
  • It can get very smoky.

How to Avoid Common Home Roasting Errors

The following are the standard house roasting errors and tips on how to keep away from them.

Inconsistent temperature

The inconsistent temperature will lead to a mix of burnt and unroasted coffee beans. It would assist for those who used a range or a roasting technique that you would be able to simply set the temperature. The temperature for roasting coffee beans needs to be round 350⁰F and 450⁰F.

Roasting too many beans without delay

Roasting too many beans in a batch could be likened to biting greater than the mouth can chew. Only roast a amount that can enable the circulation of sizzling air within the roasting tools, be it oven, pan, or popcorn popper. There should be area between the beans.

Not focusing

When you might be within the process, be able to observe from step to step to the top. You should control the transition of your coffee beans from stage to stage so they don’t get burnt. You needs to be targeted and time aware after the primary crack as a result of a minute delay may end up in ruined beans


Degassing is the method of decreasing the quantity of CO2 current within the beans after roasting. You degas your beans by leaving them in an open area for 12 hours. After this period, you retailer them in an air-tight container. Don’t brew the coffee beans till after 24-48 hours of roasting.

Degas Roasted Coffee Beans at Home

To study extra in regards to the degassing course of, be sure you try our Degassing Roasted Coffee Beans Guide

It’s essential that after correctly degassing your beans for 12 hours, that you just retailer them correctly. Using an hermetic container is vital, particularly one with a one-way valve. This will enable for the CO2 to slowly escape and forestall the beans from oxidation. Beans which are saved needs to be used inside 7 days. After per week, the beans will start to stale as oxidations will set in.


Practice makes perfection, says the English proverb. You won’t ever get it proper till you give it a strive. Moreover, the journey of a thousand steps begins with one step. And at all times bear in mind to document the satisfaction obtained from every roast. It’s solely by way of this will you uncover and keep on with the process and cooking situation that tastes nicely with you. So I hope you’ve loved our information on How to Roast Coffee Beans at Home and Good luck to you!



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