Free roast beef cooking time calculator and timer. Enter weight (kg/lb), doneness and oven types for exact cooking times, safe temperatures & alerts.
Roast Beef Timer
Oven times, target temperatures and a live cooking timer for any beef joint, anywhere.
Based on professional roasting ratios, checked against a meat thermometer — accurate for any joint, oven, or unit.
- Oven in
- Turn down
- Take out
- Carve
Table of Contents
What a roast beef cooking time calculator doesHow to use this roast beef timerHow the cooking time is calculatedHow long to cook roast beef: times by weightRoast beef internal temperature chartOven temperatures: electric, fan and gasResting roast beefA sample roast beef timelineBone-in, boneless and prime ribTips for better roast beefWhy your roast can cook faster or slowerStoring and reheating leftoversFrequently asked questionsAdd this tool to your websiteA Sunday roast has a habit of going wrong in the last hour. The beef is ready at 12:40, the potatoes need another twenty minutes and nobody has started the gravy. Most of that stress comes from not knowing, right at the start, when the joint actually has to go in. This roast beef cooking time calculator takes that guesswork away. Tell it the weight of your joint, how you like it cooked and what kind of oven you have, and it gives you the oven time, the temperature to take the meat out at and a clock time for every stage, carving included.
It works in kilograms or pounds, in Celsius or Fahrenheit, and it handles electric, fan and gas ovens, so it is just as useful in a kitchen in Manchester as it is in one in Melbourne, Toronto or Mumbai. Below the tool you will find a step-by-step guide to every button, the formula behind the numbers, ready-made tables for common weights, an internal temperature chart and straight answers to the questions people ask most about roasting beef.
What a roast beef cooking time calculator does
A roast beef calculator turns four details into a schedule: the weight of the joint, whether it is boneless or on the bone, the type of oven and how well done you want it. Recipes usually give a single figure, something like “roast for 1 hour 30 minutes”, and leave you to work out the rest. That breaks down quickly. A 1 kg joint and a 3 kg joint do not cook in a proportional way, and a rare roast needs far less time than a well done one. The calculator does that arithmetic in a split second, and it never forgets the resting time, which is the step most people leave out when they plan a meal.
This roast beef timer goes a little further than a plain calculator. It can work backwards from the time you want to eat, it draws a timeline of the whole cook, and it can run as a live countdown with an alert at each stage, so you can get on with everything else in the kitchen instead of watching the clock.
How to use this roast beef timer
The calculator sits at the top of this page and every control is explained here, in the order you will use them.
Enter the weight of your joint
Weigh the beef before it goes in the oven, or use the weight on the butcher’s label. Type it into the weight box or use the minus and plus buttons; hold a button down and the number changes quickly. The tool accepts joints from 0.5 kg to 10 kg (1 lb to 22 lb). The kg/lb switch converts your number for you, and a small line above the box shows the other unit, so 1.5 kg appears as roughly 3 lb 5 oz. If you type something outside the range, the box turns red and tells you the limits.
Choose boneless or on the bone
Rolled and boneless joints take longer per 450 g than joints cooked on the bone, so the calculator uses a different rate for each. Pick “Boneless” for a rolled sirloin, topside or silverside, and “On bone” for a standing rib roast or a joint with the bone left in. A small bone appears on the beef picture when you choose the bone-in option.
Select your oven type
Electric (conventional), Fan and Gas change the temperatures you are shown, not the cooking time. Electric uses 220°C for the first stage and 180°C afterwards, fan ovens drop both by 20°C to 200°C and 160°C, and gas shows mark 7 followed by mark 4. Every temperature appears in both Celsius and Fahrenheit, so the numbers make sense wherever you live.
Set the doneness
Drag the slider, or tap a label, to move between rare, medium-rare, medium, medium-well and well done. The picture of the beef changes colour as you move and the cooking time, take-out temperature and resting temperature all update at once. If you choose rare or medium-rare, a short note under the slider reminds you that those finishes sit below the USDA safe minimum of 63°C (145°F), so you can make an informed choice.
Read your results
The large figure is the time the joint spends in the oven. Underneath, “Take out at” is the centre temperature at which you should remove the beef, “After resting” is the temperature it should reach while it rests, and “Oven” shows the two oven settings. The coloured bar splits the cook into searing, roasting and resting, and four clock times show when to put the joint in, turn the oven down, take it out and carve. The line under the large figure adds the resting period, so you can see how long it is from oven to table.
Plan backwards with “Serving at”
If you know when you want to eat, enter that time. The calculator counts backwards and tells you when to take the joint out of the fridge (about an hour before it goes in) and when to switch the oven on (twenty minutes before the joint goes in). If there is not enough time, it says so and shows the earliest moment you could carve. Press “Start now instead” to clear the time and plan from the current moment.
Start the cooking timer
Press “Start cooking timer” when the joint goes into the oven. The settings lock and a live countdown moves through three stages: searing, roasting and resting. Each time a stage ends you get an on-screen alert with a chime, and a short vibration on phones that support it: turn the oven down, take the joint out, then carve. Use Pause and Resume if you are interrupted. Stop asks you to tap twice, so a stray touch cannot cancel your roast. If you close the page or refresh it, the timer picks up where it was when you come back on the same device and browser. Keep the page open for the sounds to play, because many phones silence web pages in the background.
Turn the sound on or off
The speaker button at the top right of the tool mutes the chimes and button beeps, and remembers your choice next time. Muting does not hide the alerts: the message box and the vibration still appear, so you will not miss a stage. The tool also remembers your last weight, doneness, joint type and oven choice on your device, so a repeat roast takes a few seconds to set up.
How the cooking time is calculated
The method is the classic one found in traditional roasting charts: a set number of minutes for every 450 g (1 lb) of beef, plus one extra portion of that same time. The extra portion allows for the time heat needs to travel to the middle of the joint, which is why a small joint does not simply scale down in proportion. It is also why a roast beef cooking time calculator built on a flat “minutes per kilo” figure tends to be a little off at both ends of the weight range.
The minutes per 450 g depend on doneness and on whether the joint has a bone:
| Doneness | Boneless | On the bone |
|---|---|---|
| Rare | 20 min | 15 min |
| Medium-rare | 22.5 min | 17.5 min |
| Medium | 25 min | 20 min |
| Medium-well | 27.5 min | 22.5 min |
| Well done | 30 min | 25 min |
Minutes per 450 g, plus one extra portion. The rare, medium and well done values match published oven-maker charts; medium-rare and medium-well sit halfway between their neighbours.
A worked example
Take a 1.5 kg boneless joint cooked medium-rare. First convert the weight into portions of 450 g: 1,500 ÷ 450 = 3.33. Add the extra portion to get 4.33, then multiply by 22.5 minutes: 4.33 × 22.5 = 97.5, which the calculator rounds to 98 minutes, or 1 hour 38 minutes. The first 20 minutes are spent at the high searing temperature and the remaining 78 minutes at the lower roasting temperature. A joint of that size then rests for 25 minutes, so the beef is ready to carve 2 hours and 3 minutes after it goes into the oven.
If you work in pounds, the sum is the same with pounds in place of grams: minutes per lb × (weight in lb + 1). The calculator converts exactly rather than rounding 450 g to a pound, so a figure you work out by hand may differ by a minute or two.
How long to cook roast beef: times by weight
If you just want a quick answer to “how long to cook roast beef per kg” or per pound, these tables use the same formula as the calculator. They show oven time only, so add the resting time from the table further down. For a 1 kg boneless joint the answer runs from 1h 04m to 1h 37m depending on doneness, and the time per kilo falls as the joint gets bigger because the extra portion is spread over more meat.
Boneless or rolled joint, by kilograms
| Weight | Rare | Med-rare | Medium | Med-well | Well |
|---|---|---|---|---|---|
| 1 kg | 1h 04m | 1h 13m | 1h 21m | 1h 29m | 1h 37m |
| 1.5 kg | 1h 27m | 1h 38m | 1h 48m | 1h 59m | 2h 10m |
| 2 kg | 1h 49m | 2h 03m | 2h 16m | 2h 30m | 2h 43m |
| 2.5 kg | 2h 11m | 2h 28m | 2h 44m | 3h 00m | 3h 17m |
| 3 kg | 2h 33m | 2h 53m | 3h 12m | 3h 31m | 3h 50m |
| 4 kg | 3h 18m | 3h 43m | 4h 07m | 4h 32m | 4h 57m |
Oven time, hours and minutes. Boneless or rolled joint. Med-rare = medium-rare, Med-well = medium-well, Well = well done.
Joint on the bone, by kilograms
| Weight | Rare | Med-rare | Medium | Med-well | Well |
|---|---|---|---|---|---|
| 1 kg | 48m | 56m | 1h 04m | 1h 13m | 1h 21m |
| 1.5 kg | 1h 05m | 1h 16m | 1h 27m | 1h 38m | 1h 48m |
| 2 kg | 1h 22m | 1h 35m | 1h 49m | 2h 03m | 2h 16m |
| 2.5 kg | 1h 38m | 1h 55m | 2h 11m | 2h 28m | 2h 44m |
| 3 kg | 1h 55m | 2h 14m | 2h 33m | 2h 53m | 3h 12m |
| 4 kg | 2h 28m | 2h 53m | 3h 18m | 3h 43m | 4h 07m |
Oven time, hours and minutes. Joint on the bone, such as a standing rib roast.
How long to cook roast beef per pound
Working in pounds? Here are the most common sizes for a boneless joint, with the kilogram equivalent alongside. If you need to convert a weight that is not in the table, our kg to lbs converter does it instantly, and the ounces to grams converter helps when a butcher quotes a weight in ounces.
| Weight | Rare | Medium | Well |
|---|---|---|---|
| 2 lb · 0.9 kg | 1h 00m | 1h 15m | 1h 30m |
| 3 lb · 1.4 kg | 1h 20m | 1h 41m | 2h 01m |
| 4 lb · 1.8 kg | 1h 41m | 2h 06m | 2h 31m |
| 5 lb · 2.3 kg | 2h 01m | 2h 31m | 3h 01m |
| 6 lb · 2.7 kg | 2h 21m | 2h 56m | 3h 31m |
Oven time for a boneless joint. Add 20 to 30 minutes for resting.
Oven time compared: boneless against on the bone
The chart below shows a 2 kg (4.4 lb) joint at every doneness level. The difference between the two joint types is easy to see: a joint on the bone is ready roughly 27 minutes earlier at the same doneness.
Oven time in minutes for a 2 kg joint. Resting time is not included.
Roast beef internal temperature chart
Time gets you close, but the temperature at the centre of the joint is what tells you when the beef is done. Ovens run hot or cold, and joints differ in shape, so use a probe or instant-read thermometer for the final check. Push it into the thickest part of the meat, away from any bone and clear of the surface fat.
Beef keeps cooking while it rests, because the hot outer layers continue to push heat towards the middle. That is why the chart has two sets of figures: the temperature at which you take the joint out of the oven, and the slightly higher temperature it reaches after resting. In this calculator the rise is about 3 to 4°C (5 to 7°F), which suits an average joint; a very large joint can climb further.
| Doneness | Out °C | Out °F | Rested °C | Rested °F |
|---|---|---|---|---|
| Rare | 50 | 122 | 54 | 129 |
| Medium-rare | 54 | 129 | 57 | 135 |
| Medium | 59 | 138 | 63 | 145 |
| Medium-well | 63 | 145 | 66 | 151 |
| Well done | 68 | 154 | 71 | 160 |
“Out” is the centre temperature when you remove the joint from the oven. “Rested” is the temperature after resting under foil.
What the USDA says about safe temperatures
The USDA Food Safety and Inspection Service recommends cooking whole cuts of beef, including roasts, to a minimum internal temperature of 145°F (63°C), followed by a rest of at least three minutes. Ground beef, which includes burgers and meatloaf, is held to a higher 160°F (71°C). In the chart above, medium and everything beyond it meets the 63°C figure after resting. Rare and medium-rare finish below it. Plenty of people choose to eat roast beef that way, and that is a personal decision, but if you are cooking for someone pregnant, elderly, very young or with a weakened immune system, aim for at least 63°C (145°F).
What each level looks like
Oven temperatures: electric, fan and gas
Roast beef is cooked in two stages. The joint goes into a fully preheated oven at a high temperature for the first 20 minutes, which browns the outside and builds flavour, then the heat is turned down so the inside cooks gently and evenly. The calculator follows that pattern for every oven type.
| Oven type | First 20 minutes | Then |
|---|---|---|
| Electric | 220°C / 428°F | 180°C / 356°F |
| Fan | 200°C / 392°F | 160°C / 320°F |
| Gas | Mark 7 (220°C) | Mark 4 (180°C) |
Fan ovens circulate hot air and cook more intensely, so they are set about 20°C lower than a conventional oven.
Always preheat properly. The cooking time starts when the joint goes into an oven that has already reached temperature, and most ovens need 15 to 20 minutes to get there. A roast also uses a lot of energy over two hours or more, so if you are curious what that session costs on your tariff, try our electricity cost calculator.
Resting roast beef
Resting is not optional. While the beef sits, the juices that were pushed towards the centre spread back through the meat, and the temperature settles. Carve straight away and a surprising amount of liquid ends up on the board instead of in the slices. The USDA’s food safety minimum is only three minutes, but for flavour and texture a roast needs far longer. This calculator scales the rest with the size of the joint:
| Joint weight | Rest |
|---|---|
| Under 1.5 kg (3.3 lb) | 20 minutes |
| 1.5 kg to under 3 kg | 25 minutes |
| 3 kg (6.6 lb) and over | 30 minutes |
Rest the joint on a warm plate or board, loosely covered with foil.
Cover the beef loosely, not tightly. A snug wrap traps steam and softens the crust you worked to build. If the potatoes and vegetables are the bottleneck, the rest is the perfect window to use the oven at a higher temperature.
A sample roast beef timeline
Here is how the numbers play out for a 2 kg boneless joint, cooked medium and served at 1:00 pm. The calculator’s “Serving at” feature produces this schedule automatically.
| Step | Time |
|---|---|
| Take the joint out of the fridge | 9:19 am |
| Switch the oven on (220°C / 428°F) | 9:59 am |
| Joint into the oven | 10:19 am |
| Turn down to 180°C / 356°F | 10:39 am |
| Take out at 59°C / 138°F | 12:35 pm |
| Carve and serve | 1:00 pm |
2 kg boneless joint, medium, electric oven. Oven time 2 h 16 m, rest 25 min.
The three stages of the 2 kg example, drawn to scale.
Notice how much of the afternoon the beef takes up compared with the time you actually spend working. Most of it is waiting, which is a good moment to prepare everything else. If gammon or ham is also on the table, as it often is at Christmas or Easter, our gammon cooking calculator will help you time that joint around the beef.
Bone-in, boneless and prime rib
The calculator is designed for roasting joints: cuts that are tender enough to cook quickly in a hot oven and be sliced.
Prime rib and the American method
Many American recipes roast beef at a steady 325°F (163°C) with no hot start. US government roasting charts suggest roughly 23 to 25 minutes per pound for a bone-in rib roast cooked that way. The two-stage method used here is usually a little quicker, so for a 5 lb prime rib set to medium-rare the calculator gives about 1 hour 46 minutes, a bit under the steady-heat figure. Choose the method you prefer, but whichever you use, finish by checking the centre temperature rather than the clock.
Tips for better roast beef
Why your roast can cook faster or slower
No calculator can see inside your oven. If the result differs from the estimate, one of these is usually the cause:
That is the reason this page keeps repeating the same advice: use the time as your plan and the thermometer as your proof.
Storing and reheating leftovers
Cold roast beef is one of the best things about cooking a big joint, as long as it is handled safely. The USDA advises refrigerating leftovers within two hours of cooking, wrapping them airtight or storing them in shallow containers so they cool quickly, and eating them within three to four days. Frozen, they keep for about three to four months. When you reheat them, bring the beef to 165°F (74°C) in the centre as measured with a food thermometer.
Frequently asked questions
How long does it take to cook roast beef per kg?
It depends on doneness and on whether the joint has a bone. For a 1 kg boneless joint the oven time runs from 1h 04m for rare to 1h 37m for well done, with medium at 1h 21m. Larger joints take less time per kilo because the extra portion in the formula is spread across more meat. The tables above list every common weight.
How long does it take to cook roast beef per pound?
As a rule of thumb, allow 15 to 30 minutes per pound depending on doneness and bone, plus one extra pound’s worth of time. A 4 lb boneless joint takes about 1h 41m for rare, 2h 06m for medium and 2h 31m for well done. The pound table above has more sizes.
What temperature should roast beef be for medium-rare?
Take it out of the oven at 54°C (129°F). After resting it should reach about 57°C (135°F), which gives a warm red-pink centre. That is below the USDA minimum of 63°C (145°F) for whole cuts of beef, so choose it knowingly, and avoid it if you are cooking for someone in a higher-risk group.
What internal temperature is roast beef done?
That depends on how you like it. Rare is about 54°C (129°F) after resting, medium-rare 57°C (135°F), medium 63°C (145°F), medium-well 66°C (151°F) and well done 71°C (160°F). The USDA minimum for roasts is 63°C (145°F) with at least a three-minute rest.
How long should roast beef rest?
Rest it for 20 minutes if the joint is under 1.5 kg, 25 minutes for 1.5 to 3 kg and 30 minutes for anything larger. Keep it loosely covered with foil on a warm plate. The calculator adds this time to the schedule so it is not forgotten.
Should I cover roast beef with foil while it cooks?
No, cook it uncovered so the outside browns and forms a crust. If the top is darkening too quickly towards the end, a loose piece of foil will slow it down. Save the foil for the resting period.
Does this work for prime rib or a standing rib roast?
Yes. Select “On bone” and enter the weight including the bones. Expect a time slightly shorter than recipes that roast at a steady 325°F, and use a thermometer to confirm the centre temperature.
What should I use for a fan oven?
Choose “Fan” in the calculator. It shows 200°C for the first 20 minutes and 160°C afterwards, which is the 20°C reduction usually recommended for fan ovens. The cooking time itself stays the same.
Is it safe to eat rare roast beef?
The USDA recommends a minimum of 63°C (145°F) for whole cuts of beef, so rare and medium-rare are below that guideline. Many people still choose them for roasts, and that is a personal decision. If you are pregnant, elderly, cooking for young children or have a weakened immune system, cook to at least 63°C (145°F).
Can I use the calculator for a frozen joint?
No. The times assume a fully thawed joint that has come straight from the fridge or stood out for about an hour. Thaw frozen beef completely in the fridge first, which usually takes a day or more for a large joint.
Does the timer keep running if I close the page?
Yes. The timer saves its progress in your browser, so when you reopen the page on the same device and browser it carries on from the right point. Alert sounds only play while the page is open, so keep it open and the screen awake if you want to hear them.
Is the roast beef calculator free?
Yes, it is completely free to use. There is nothing to download or sign up for, and it works on phones, tablets and computers.
Add this tool to your website
Run a food blog, a family cooking site or a butcher’s page? You can show this roast beef timer on your own website. Copy the iframe code below and paste it into the HTML of any page or post where you want the tool to appear.
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