Oven temperatures

Our guide to converting °C and °F, what to do with a fan oven, and the mystery of ‘gas marks’.

Just about every food website in the world, along with the majority of recipe or culinary training books have an oven temperature conversion table.

Well, here is another one. Not just because I so love typing out tables of data, but also because this site contains a number of recipes and it seems only right to provide all of the info that you need to cook them in the same place.

I’ve added a separate column for fan assisted ovens in °C, the general rule is that you subtract 20°C (about 36°F) when using a fan oven.

°C °F
Water freezes 0 32
Water boils 100 212

Oven Temperatures

°C °C (fan) °F Gas Mark
Very cool 110 90 225 ¼
130 110 250 ½
Cool 140 120 275 1
150 130 300 2
Moderate 170 150 325 3
180 160 350 4
Moderately hot 190 170 375 5
200 180 400 6
Hot 220 200 425 7
230 210 450 8
Very hot 240 220 475 9

If you want to convert between any temps that aren’t listed here, don’t forget that you can always use Google for just about type of conversion, simply by typing the amount you want to convert and the from and to units into the search bar.

This article was moved from the authors former website, which is why some comments may predate the publication date.

  • Barry Williamson

    Thank you! I wondered why everything was overcooked or burned in my new fan oven even though I followed the recipes.

  • http://johnonfood.com John

    Glad it helped!

    Every fan oven is slightly different, so you will need to experiment slightly, but the rule above is pretty reliable.

  • amme

    this is so helpful thank you so much

  • judith

    At last! I now have a proper conversion of gas regulos for my fan oven. I’ve been struggling for so long to get the correct temperature for my food. Many thanks judith

    • http://johnonfood.com John

      Glad that it helped Judith – It seems that the majority of temp conversion charts don’t bother to mention the fact that fan ovens need to be much lower than conventional ovens.

  • cer1970

    Thank you so much, No more burnt offerings!

  • barbara

    hi john
    Thankyou so very much, brilliant. No more guessing cooking with a fan oven, (need it perfect for simnel cake! )recipe book about 50 yrs old so no such thing as fan ovens!! love the tip for calculating quickly as well – subtract 20 for fan oven. no more shakey baking. thanks again. Barbara

  • Pat Amos

    Thank you so much John. Now I should know there is no mopre guessing that I have it correct.

    Regards Pat

  • Paula

    Thanks for the temeratures. I have just purchased a new fan assisted/’normal’ oven. Do I also have to adjust the cooking time please, or do I just follow the instuctions, but knock the temperature down?

  • http://johnonfood.com John

    Hi Paula,

    The easiest thing is just to leave the cooking time as it in the recipe, and adjust the temperature downwards.

  • Shirley

    Thank you so much for sharing this information with us. I had been used to a simple gas oven, then moved into a house with a fan-forced electric oven. There was no instruction manual available to teach me the intricacies of this, though! After several burnt offerings, I decided to search the web and was very grateful to come across this site. Shirley

  • sheila

    Hi! thanks for the NEW chart, i had an OLD chart from a circafan oven from 17YRS ago and wondered why nothing cooked correctly! the oven was a fan but its chart is completely different in conversion to yours i would say it was out about 20percent, my fan chart said gas 5 was 150c yours says 170c, i wondered why everything took longer in my new one. thanks again sheila

  • Sophie-Ann

    Thank you so very much. I looked into every cook book I have and found nothing. You have answered my father’s dream of my baking lots of cakes for him so he thanks you too! xxx

  • irene

    thank you mum found it difficult converting tempratures,as an avid baker this information is invaluable as she couldnt get any information in all her cookery books so big thank you to your sight.xxx

  • http://johnonfood.com John

    I am glad that you are all finding the chart useful.

    It is such a simple thing, but if you don’t have the information it makes baking or roasting anything a complete guessing game.

    If you are converting recipes from different countries, here is another chart that you might also find useful: http://johnonfood.com/ingredients/egg-sizes/

  • Rose

    Hi I have always cooked by gas but moved to a new apartment and it has fan assisted electric. I would like to know how i can convert temperatures from gas to electric Thank You

  • http://johnonfood.com John

    Hi Rose,

    Just use the table above, the last column is the gas mark that you would normally use.

    Find the gas mark and then just follow the row across and set your electric oven to that temperature.

  • sarah

    I’ve just got a fan assisted oven and cooked a brisket of be with vegetables. Unfortunatley the veg didn’t cook through can you explain why this has happened?

  • dennis

    atlast i might be abale to get some thing to eat,, thankyou dennis

  • Patricia

    I’ve just moved and there is a fan oven in the house. It’s Hygena turbo Model AHY3220.
    I don’t understand the temp markings. They go up in 10s…starting at 0 and up tp 50.
    Can you give me some help please?
    Thanks in anticipation.

  • David

    I can’t find a comparison for gas oven settings between natural gas and LPG. Can anyone help please?

  • Joan

    Thankyou this helps alot. I have been used to gas for many years.

  • patricia

    Im using an old Mary Berry book for her traditional christmas recipe. The first two turned out ok with me adjusting the fan oven temp to what I thought, but were a bit dry. I read somewhere that you should reduce the temp by 25% to get the correct temp for a fan oven. However, I wanted to get it absolutely correct and, having found this conversion table, it seems to confirm that the 25% less rule is about right. Thanks for making this easier for me. Many thanks.

  • Lola

    I have recently moved house and don’t know how to convert gas mark to electric – I used to use a gas cooker but in my new house there is an electric one. The table above doesn’t help because the temperature dial goes up in ones, so 1 2 3 4 5 etc… I don’t think it is gas mark. The recipe I am using is for a tart base and I need to convert gas mark 7 to electric. Can anyone help?

  • http://johnonfood.com John

    @ Lola – I have no idea how that works, maybe the best thing would be to use an oven thermometer to work out what the numbers on your dial mean. You can pick them up pretty cheaply from any kitchen shop.

  • Anne Keeling

    Hi I have exactly the same problem as Lola, my electric oven dial is numbered 1 to 10, surely there is a guide for electric ovens that simply states what temperature each number represents WITHOUT giving GAS conversion charts, please help

  • http://johnonfood.com John

    @ Lola and Anne – I wish I could help you, but I have never seen an oven marked like that, I would guess that the numbers are equivalent to gas marks, but if not then I have no idea. Sorry

  • Ann Ogden

    We have recently had a new cooker the fan assisted oven has a rear fan but a top and bottom element I am experimenting at the moment the recommendation is bottom heat with fan for sponge cakes 180c but they burn at the bottom I am on my third cake mix any suggestions I am currently experimenting with each configuration top element Bot element both elements etc help!

    • porkandgin

      You could try wrapping the bottom and sides of the cake tin with a couple of layers of tin foil – shiny side out.
      It will reflect some of the direct heat hitting those surfaces

  • Adrian Oakley

    We have a new electric cooker which has the option of with or without fan. Without fan (conventional) set on, say 180, a portable oven thermometer in the middle of the oven reads 180. If the oven is now set to 160 with fan, (the equivalent) the portable thermometer still reads 180. Why is this?

    • porkandgin

      I’m not sure of the science behind it, but it does prove that the temperature conversion table works perfectly.

  • Lucy Treacy

    I have A Necht Electric Convection Oven and I have lost the instruction book can you please advise where I could get one or download one? Thanks


  • Eileen

    Dear John, I have a fan assisted gas oven, if my recipe says cook on gas mark 5, do I need to reduce the temperature to gas mark 4 or 3.

    Thanks Eileen

    • porkandgin

      Gas mark 3

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    I am bookmarking this asap! Thank you very much 😉

  • Neil

    Just found this great site and was about to ask exactly the same as Eileen; if recipe says Gas Mk8 I reckon between 6 and 7 to allow for the fan?

    • porkandgin

      Yes, 6 and a half would be perfect.

  • Joy

    This site is fantastic! After a few disasters, last being apple crumble exploding all over the oven, I decided to check temps for fan ovens. I have never cooked with a fan oven before and this info is invaluable. Thank you very much John. Joy

  • Billy

    I have found this information very helpful but still can’t for the life of me understand why supermarkets don’t just print the extra temperatures for fan assisted ovens on the cooking instructions. Surely this would be easier as most ovens (intergral or freestanding) nowadays come fan assisted. The oven I have recently bought has a double oven with the lower being fan assisted and the smaller upper one being conventional type.

  • Mary

    Hi John , I would like to ask you if I did understand well what your saying. When the recipe calls for 180c/160c fan/gas 4, it means that I have to put my fan assisted oven on 160c., and 160c means gas 3. Thanks for your help very appreciated.

  • lynda

    thanks John, now hopefully I can cook without burning everything. It has taken me a long time to figure out

  • George

    Very good article, thank you John. I am interested to know what is a good temperature for slow cooking for long periods in a fan assisted oven. Lots of articles for slow cookers and likewise recipe books, but nothing for ovens.

  • Harry

    What is the difference between a fan assisted oven and a fan oven? And are the temperatures/timings different?

    • porkandgin

      They are the same thing.

  • http://johnonfood.com John

    @ Harry – They are two terms for the same thing.

  • http://www.bakedwithkindness.com/ Ryan Carr

    Great tip, I was always told to reduce temp by 20%, but that was usually around 20°C anyway haha

    Thanks for sharing :O)

  • Brenda

    Is it correct that oven temps. in a fan oven are the same over the whole oven?>

  • Brenda

    Is it correct that oven temps. in a fan oven are the same over the whole oven?>

    • Sharon

      yes – that is the theory. However if the fan oven is old it can vary slightly between the middle and the edges.

  • suzi

    When only one temp is given for electric oven is it for fan assisted or conventional?

    • Sharon

      it is for conventional – if the temp is for fan assistance it always states that.

  • Powelly

    and how about halagon ovens? When cooking food do we take the “fan” assisted temperature. I was told to reduce temp by about 20oC but then I not sure if that is -20oc from the conventional oven temp or the fan assisted temp??

    Any advice greatly appreciated. As yet I dont see any temps on packaging for halogen ovens.

    • porkandgin

      As a rough guide you should reduce the cooking temperature down by about 10% from the normal oven temperature.
      You will need to shorten the cooking time as well, you should probably start checking things after about 3/4 of the listed time is up.

    • porkandgin

      As a rough guide, for halogen ovens, you should reduce the cooking temperature down by about 10% from the normal oven temperature.
      You will need to shorten the cooking time as well, you should probably start checking things after about 3/4 of the listed time is up.

  • Sue

    Many thanks for fan conversion. At last no more burnt offerings when we go and stay in our holiday cottage.

  • poppy

    thank you so much nice and straight forward just deducted 20 degrees or else bara brith would of burnt.

    • porkandgin

      Ooh, bara brith! Wouldn’t care to share your recipe with us all would you Poppy?

  • Jan

    Thank you for this information, was always guessing on what temp to reduce too with fan assist oven. Very helpful

  • i hate mondays

    my electric oven doesnt show a brand or model and the oven temp. and has the numbers 1-5, do you think i should follow the gas mark conversion?

  • Tel

    What’s the time difference between fan and standard oven in cooking time for a Christmas cake

    • porkandgin

      The easiest thing is to reduce the temperature by 20 degrees and leave the cooking time the same.

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  • rackroo

    I have a an option of normal oven and fan. I have an oven thermometor inside the oven and it reads exactaly what the dial suggests example. dials says 200 degrees so does the the inside thermometer. When using the fan oven and set the dial to 180 the inside temp says 210. does this mean if something on the packing says cook in fan at 180 and mine is typically 30 degrees hotter inside as the inside oven thermometor suggests should i set the dial to 150 to get the desired temperature the packaging suggests? I

    • porkandgin

      That is really quite odd.

      The temperature inside the fan oven should be the same as the temperature on the dial .

      The reason that things cook faster at a lower heat in a fan oven is not that it is actually hotter in there, just that the heat is more evenly distributed, and due to the effect of convection currents.

      We really aren’t sure, but are going to do some tests with a thermometer in a fan oven or two and see what results we come up with!

  • Marlene Deans

    hi ! ..when i bake cakes my sponges are too brown or black at the back.. and crunchie on top ! it says 180f for 20 -25min any advice ??

    • porkandgin

      Cover the top with foil, and rotate them 180 degrees halfway through the cooking time.

  • Bernard

    Thanks John, I’ve printed off the table

  • aina

    Hii…I have a gas oven which shows just 10 to 50 on a knob…I really don’t know what is that .timer or temperature. ..accept this there is no number on any of knob…please guide …

  • zoebanks

    Packaged food does not state halogen oven times so could you please let me know the difference between an oven, a fan assisted oven and a halogen oven.

    • https://porkandgin.com/ porkandgin

      Very good question Zoe, and prompted by it, we are just putting together an article with a table and some tips for cooking with halogen.

      In the meantime a good starting rule for adapting recipes or packaged food instructions is to reduce the cooking time by 20% and the heat by 30%.

  • http://www.poptasticdave.co.uk/ Poptasticdave

    Really useful article – thank you. I have just bought a fanned GAS oven – not by choice really but because of the very limited choice of cookers that will fit the 55cm wide space I have for it. Question: the ‘regulo’ is marked in Centigrade rather than Gas Marks (which will confuse me for years to come), but should I treat the oven as if it was an ELECTRIC fan oven (i.e. deduct 20 degrees from the values stated in recipes) or do I go for the Centigrade conversion of the Gas Marks or do I need to do something completely different?! The cooker instructions do not say anything about this, only that fanned ovens do not have heat zones. It’s not yet installed, so I have no experiences at all yet to go on.
    Be really grateful for any advice or thoughts about this.

    • Cherie

      I have exactly the same question, I might even have bought the same oven!
      So, how do you count gas fan ovens on the temperature table?

      • https://porkandgin.com/ porkandgin

        See the reply above :-)

    • https://porkandgin.com/ porkandgin

      Hi Dave

      You should treat it exactly like an electric fan oven. Forget that it is gas and just follow the timings and temperatures for fan ovens.