iMac (24-inch, M1, 2021)
Quick look
Each figure is from the source marked1 unless it carries its own number.
Specifications
Body
- Dimensions
- 461 x 547 x 147 mm
- Weight
- 4.46 kg
- Colours
- Blue, Green, Pink, Silver5
- Ports
- Two Thunderbolt / USB 4 ports, 3.5mm headphone jack
- Thunderbolt ports
- 2
- Thunderbolt version
- Thunderbolt 3
- USB-A ports
- No USB-A ports.6
- HDMI
- No HDMI port.7
- SD card slot
- No SD card slot.7
- Headphone jack
- Yes
- Keyboard
- Magic Keyboard
- Touch ID
- No Touch ID.6
Display
- Display size
- 24 in
- Resolution
- 4480 x 2520
- Pixel density
- 218 ppi
- Display type
- 4.5K Retina display
- Brightness
- 500 nits
- Wide colour (P3)
- Yes
- Nano-texture option
- No nano-texture display option.7
Chip and memory
- Chip
- Apple M1 chip
- Apple silicon
- Yes
- CPU cores
- 8
- Performance cores
- 4
- Efficiency cores
- 4
- GPU cores
- 7
- Neural Engine cores
- 16
- Chip options
- M1 with 8-core CPU and 7-core GPU or 8-core GPU
- Memory (base)
- 8GB
- Memory (maximum)
- 16GB
- Memory options
- 8GB or 16GB
- Memory upgradeable by user
- No, as Apple documents8
- Storage (base)
- 256GB
- Storage (maximum)
- 2TB
- Storage options
- 256GB, 512GB, 1TB or 2TB
Battery and power
- Included power adapter
- 143 W
Connectivity
- Wi-Fi
- 802.11ax Wi-Fi 6
- Bluetooth
- 5.0
- Ethernet
- Gigabit Ethernet configurable9
- External displays (base)
- 1
Camera and audio
- Camera
- 1080p FaceTime HD camera
- Speakers
- High-fidelity six-speaker system with force-cancelling woofers
- Microphones
- Studio-quality three-mic array with high signal-to-noise ratio and directional beamforming
Platform
An iMac has no battery, so battery rows do not apply.
What it actually costs
- Used, Grade A
- £625–£65014cheapest of 4 CeX listings · out of stock online and in store when read · repriced 30 October 2026 · since 1 Nov 2026 · earlier: £650 from 28 Sep 2026
- Used, Grade B
- £500–£57515cheapest of 4 CeX listings · repriced 30 October 2026 · since 1 Nov 2026 · earlier: £525–£575 from 2 Oct 2026
- Used, Grade C
- £450–£47516cheapest of 4 CeX listings · out of stock online and in store when read · repriced 30 October 2026 · since 1 Nov 2026 · earlier: £475 from 28 Sep 2026
- Trade in yours, Grade A
- £275 cash / £393 voucher1443% more as store credit
Read 3 November 2026. CeX is one UK retailer; its used and trade-in figures are shown at its condition grades for the base configuration: M1 with 8-core CPU and 7-core GPU, 8GB memory, 256GB storage. “Since” is the first day MacIQ read that figure; “earlier” figures were each read from the date shown. We hold no stock and take no commission.
Apple UK price, as listed
Apple’s UK store page for the base configuration (Apple M1 chip, 8-core CPU, 7-core GPU, 8GB memory, 256GB storage), as the Internet Archive saved it. Each row runs from the first to the last Internet Archive capture MacIQ read at that price; the price may have held before and after. A price changed some time between the last capture read at one price and the first read at the next, so no day is given. Read 18 October 2026.
Software support
- When does the iMac (24-inch, M1, 2021) stop getting updates?
- Should I upgrade my iMac (24-inch, M1, 2021)?
- Which Macs run macOS 27?
- Which Macs run macOS Tahoe 26?
- Which Macs run macOS Sequoia?
- Which Macs run macOS Sonoma?
- Which Macs run macOS Ventura?
- Which Macs run macOS Monterey?
- Which Macs run macOS Big Sur?
- How many external displays does each Mac support?
- Can I upgrade the memory or storage in my Mac?
- Ports, displays and chargers for every Mac
Comparisons
Against its own line
Against the rest of the range
- iMac (24-inch, M1, 2021) vs Mac Studio (M1 Max, 2022)
- iMac (24-inch, M1, 2021) vs MacBook Pro (14-inch, M1 Pro, 2021)
- iMac (24-inch, M1, 2021) vs MacBook Pro (16-inch, M1 Pro, 2021)
- iMac (24-inch, M1, 2021) vs Mac mini (M1, 2020)
- iMac (24-inch, M1, 2021) vs MacBook Air (M1, 2020)
- iMac (24-inch, M1, 2021) vs MacBook Pro (13-inch, M1, 2020)
- iMac (24-inch, M1, 2021) vs iMac (Retina 5K, 27-inch, 2020)
- iMac (24-inch, M1, 2021) vs MacBook Pro (13-inch, 2020, Two Thunderbolt 3 ports)
Sources
Apple Support (UK) — iMac (24-inch, M1, 2021) - Technical Specifications ·
↩- ↩
- ↩
Security updates: no end date published.
↩Apple Support (UK) — Identify your iMac model ·
↩No USB-A ports. No Touch ID.
↩No HDMI port. No SD card slot. No nano-texture display option.
↩Apple Support (UK) — Install memory in an iMac ·
↩Apple Support (UK) — iMac (24-inch, M1, 2021) - Technical Specifications ·
↩Apple Support (UK) — macOS 27 Golden Gate is compatible with these computers ·
↩Apple Support (UK) — Identify your iMac model ·
↩Apple Support (UK) — Identify your iMac model ·
↩Geekbench Browser (Primate Labs) ·
↩- ↩
- ↩
- ↩
Apple Store (UK), as saved by the Internet Archive — Buy iMac - Apple (UK), captured 1 May 2021 ·
↩Apple Store (UK), as saved by the Internet Archive — Buy iMac - Apple (UK), captured 8 Jan 2023 ·
↩Apple Store (UK), as saved by the Internet Archive — Buy iMac - Apple (UK), captured 25 Jan 2023 ·
↩Apple Store (UK), as saved by the Internet Archive — Buy iMac - Apple (UK), captured 1 Oct 2023 ·
↩Feature and security updates: end dates not published by Apple.
↩Apple’s macOS 27 Golden Gate compatibility list names this Mac. endoflife.date says Apple usually provides security updates for the latest three macOS releases, but that this isn’t consistently applied; Apple publishes no end date.
↩
Not published by Apple
iMac (24-inch, M1, 2021). Apple doesn’t publish for this Mac: refresh rate, memory bandwidth, storage upgradeable by user, media engine, maximum continuous power, the macOS it shipped with. Geekbench 7 Metal: the Mac chart row for this Mac does not state its GPU core count, so no Metal score is shown (chart read 10 Oct 2026). Pages checked: Apple Support (UK) — iMac (24-inch, M1, 2021) - Technical Specifications; Apple Support (UK) — Identify your iMac model; Apple Newsroom (UK) — iMac features all-new design in vibrant colours, M1 chip, and 4.5K Retina display, read 9 Oct 2026.