Five-second answer

Claim we investigated

Your iPhone has more computing power than the computer that took Apollo 11 to the Moon.

True. Apollo 11's computer had a 1 MHz clock and 4 KB of working memory; iPhones exceed both thousands of times. NASA's own history of the Apollo Guidance Computer, a University of Nottingham computer scientist's comparison, and records of the Saturn V rocket's computer all put a modern phone far ahead.

Quote or cite this fact-check

FactHub rates the claim “Your iPhone has more computing power than the computer that took Apollo 11 to the Moon” True (high confidence): Apollo 11's computer had a 1 MHz clock and 4 KB of working memory; iPhones exceed both thousands of times. Reviewed October 25, 2026. https://facthub.org/n/article/iphone-vs-apollo-11-computer/1

One-minute summary

What the evidence establishes

  • Established. Apollo 11's guidance computer had a one-megahertz clock, 2K words (about 4 KB) of erasable memory and 36K words of fixed memory.
  • Established. A 2019 iPhone had more than a million times the Apollo computer's working memory.
  • Established. By one computer scientist's estimate, a 2019 iPhone had over 100,000 times the Apollo computer's processing power; even clock speeds alone differ by thousands of times.
  • Established. The Saturn V rocket's own computer was slower still, at about 12,000 instructions a second.
  • Not shown. The comparison does not show that a phone could survive or fly a Moon mission; Apollo hardware was built and tested for spaceflight stresses.
Important context: The claim compares raw computing capacity only: it says nothing against the Apollo engineers, whose computers were built and tested to survive spaceflight in a way a consumer phone is not, and it covers both the spacecraft's guidance computer and the rocket's own computer.

The evidence

The conclusion rests on the combined record. Expand each item to see its role and limitations.

Independence note: This check uses 4 methods across 4 institutions and 2 countries or international groupings.
Evidence map
Method Institution / country Year(s) What it shows Key limitation Primary links
Review of NASA's official history of spaceflight computers, which draws on MIT and contractor design records. NASA History Office United States 1988 NASA's history of the Apollo Guidance Computer states that its clock ran at one megahertz and that its memory ended at 36K words of fixed (read-only) memory and 2K words of erasable memory. A single adder circuit did all of its arithmetic. At 16 bits a word, 2K words of erasable memory is 32,768 bits, or about 4 kilobytes. This is NASA's own published history of a NASA program, so it is not independent of the agency; its figures trace back to MIT Instrumentation Laboratory design documents rather than new measurements. NASA History Office
Expert comparison of published specifications by a professor of computer science. University of Nottingham United Kingdom 2019 Graham Kendall, a computer science professor at the University of Nottingham, calculated in 2019 that the Apollo computer had 32,768 bits of working memory, while phones of the time typically had 4 GB, more than a million times as much. Using estimated speeds, he put the iPhone at over 100,000 times the Apollo computer's processing power, and found even a TI-84 school calculator almost 350 times faster. The processing multiplier uses secondhand speed estimates: Apple does not publish clock speeds, and the 0.043 MHz Apollo figure is an effective instruction rate rather than the computer's one-megahertz clock. The memory comparison rests on firmer published figures. Graham Kendall, University of Nottingham (via World Economic Forum)
Review of the manufacturer's product announcement and an independent hardware researcher's note on iPhone chip complexity. Apple, Independent researcher (Ken Shirriff) United States 2020, 2025 Apple's 2025 announcement of the iPhone 17 Pro describes a six-core CPU it calls the fastest in any smartphone, with Neural Accelerators built into each GPU core. An independent hardware researcher noted in 2020 that an iPhone processor already had over 8 billion transistors. Both point to a gap wider than Kendall's 2019 figures. Apple's press release is marketing material from the company that sells the phone and gives no clock speeds or operation counts; it shows the direction of change, not a precise multiplier. Apple Ken Shirriff
Independent reverse-engineering of Saturn V guidance hardware, read alongside IBM and NASA documentation. Independent researcher (Ken Shirriff) United States 2020 Many people mean the rocket when they say 'Apollo 11'. The Saturn V was steered from liftoff into Earth orbit and toward the Moon by IBM's Launch Vehicle Digital Computer, which performed about 12,000 instructions a second, slower than the spacecraft's own guidance computer. So whichever Apollo 11 computer the claim means, a phone is far ahead. This is one independent researcher's published analysis; its speed figure comes from the historical documentation rather than from running the hardware. Ken Shirriff
1. NASA's history records the Apollo computer's tiny clock and memory Review of NASA's official history of spaceflight computers, which draws on MIT and contractor design records.

NASA's history of the Apollo Guidance Computer states that its clock ran at one megahertz and that its memory ended at 36K words of fixed (read-only) memory and 2K words of erasable memory. A single adder circuit did all of its arithmetic. At 16 bits a word, 2K words of erasable memory is 32,768 bits, or about 4 kilobytes.

Limit: This is NASA's own published history of a NASA program, so it is not independent of the agency; its figures trace back to MIT Instrumentation Laboratory design documents rather than new measurements.

Verify: Computers in Spaceflight: The NASA Experience, Chapter 2: The Apollo guidance computer: Hardware

2. A computer scientist's comparison puts a 2019 iPhone over 100,000 times ahead Expert comparison of published specifications by a professor of computer science.

Graham Kendall, a computer science professor at the University of Nottingham, calculated in 2019 that the Apollo computer had 32,768 bits of working memory, while phones of the time typically had 4 GB, more than a million times as much. Using estimated speeds, he put the iPhone at over 100,000 times the Apollo computer's processing power, and found even a TI-84 school calculator almost 350 times faster.

Limit: The processing multiplier uses secondhand speed estimates: Apple does not publish clock speeds, and the 0.043 MHz Apollo figure is an effective instruction rate rather than the computer's one-megahertz clock. The memory comparison rests on firmer published figures.

Verify: Would your mobile phone be powerful enough to get you to the moon?

3. Today's iPhones are faster than the 2019 phone Kendall measured Review of the manufacturer's product announcement and an independent hardware researcher's note on iPhone chip complexity.

Apple's 2025 announcement of the iPhone 17 Pro describes a six-core CPU it calls the fastest in any smartphone, with Neural Accelerators built into each GPU core. An independent hardware researcher noted in 2020 that an iPhone processor already had over 8 billion transistors. Both point to a gap wider than Kendall's 2019 figures.

Limit: Apple's press release is marketing material from the company that sells the phone and gives no clock speeds or operation counts; it shows the direction of change, not a precise multiplier.

Verify: Apple unveils iPhone 17 Pro and iPhone 17 Pro Max, the most powerful and advanced Pro models ever A circuit board from the Saturn V rocket, reverse-engineered and explained

4. The Saturn V rocket's computer was slower still Independent reverse-engineering of Saturn V guidance hardware, read alongside IBM and NASA documentation.

Many people mean the rocket when they say 'Apollo 11'. The Saturn V was steered from liftoff into Earth orbit and toward the Moon by IBM's Launch Vehicle Digital Computer, which performed about 12,000 instructions a second, slower than the spacecraft's own guidance computer. So whichever Apollo 11 computer the claim means, a phone is far ahead.

Limit: This is one independent researcher's published analysis; its speed figure comes from the historical documentation rather than from running the hardware.

Verify: A circuit board from the Saturn V rocket, reverse-engineered and explained

Common questions

“Clock speed isn't computing power, so the comparison is meaningless.”

Short answer: The gap holds anyway

Clock speed alone does understate or overstate real performance. But the Apollo computer's memory was tiny by any measure: about 4 KB of working memory against gigabytes in a phone, a gap of over a million times. A modern phone also has several processor cores where Apollo had a single adder doing all its arithmetic.

“The Apollo computer ran at 1 MHz, not 0.043 MHz, so the 100,000-times figure is wrong.”

Short answer: Both, measured differently

NASA's history gives the clock as one megahertz. The 0.043 MHz figure counts how many instructions the computer actually completed, since each took several clock cycles. Using the clock instead shrinks the processing multiplier from over 100,000 to a few thousand, which still leaves the phone far ahead.

“The claim is about the Apollo 11 rocket, not the spacecraft's computer.”

Short answer: Rocket's was slower

The Saturn V rocket had its own computer, IBM's Launch Vehicle Digital Computer, which steered it from liftoff toward the Moon at about 12,000 instructions a second. That is slower than the spacecraft's guidance computer, so the claim holds for the rocket too.

“Then an iPhone could fly a Moon mission.”

Short answer: Not as is

Raw power is not the same as fitness for spaceflight. Apollo hardware was screened against vibration, shock, acceleration, temperature, vacuum and other stresses that a consumer phone is not designed or tested for. The claim is about computing capacity, not reliability.

Conclusion

The claim holds by every measure we checked, and by a wide margin. NASA's history records that the Apollo Guidance Computer had a one-megahertz clock, a final memory of 2K words of erasable and 36K words of fixed memory, and a single adder doing all its arithmetic. At 16 bits a word, 2,048 words of erasable memory is 32,768 bits, or 4 kilobytes. A University of Nottingham computer scientist, writing in 2019, put a phone of that year at more than a million times the Apollo computer's working memory and, using an estimated effective speed of 0.043 MHz for Apollo against an estimated 2,490 MHz for the iPhone, at more than 100,000 times its processing power. That speed multiplier is the softest number here: Apple does not publish clock speeds, and the 0.043 MHz figure reflects how many instructions the computer completed, not its one-megahertz clock. But the conclusion does not depend on it. Comparing clocks alone still gives a gap in the thousands, and memory gives a gap in the millions. Newer iPhones widen it further: Apple says the 2025 iPhone 17 Pro's chip has a six-core CPU and Neural Accelerators in every GPU core. The rocket did not change the picture either: the Saturn V's Launch Vehicle Digital Computer, which steered it from liftoff toward the Moon, performed about 12,000 instructions a second. What the claim does not show is that a phone could fly a Moon mission as it is. Apollo hardware was screened for vibration, shock, vacuum and other spaceflight stresses, and its value lay in reliability, not raw speed. We rate the claim True with high confidence because independent sources from different institutions, countries and decades agree on the specifications and the direction of the gap, and no source we found disputes it.

How we checked

  1. Defined the claim as: a modern iPhone has more raw computing capacity (processing speed and memory) than the computer that guided Apollo 11, and checked the Saturn V rocket's computer as well, since the claim is often worded about the rocket.
  2. Prioritized published specifications and evidence from more than one institution: NASA's history, an independent UK computer scientist's comparison, the manufacturer's current product announcement, and an independent hardware researcher's analysis of the Saturn V computer.
  3. Reviewed each source directly and recorded verbatim quotes for every figure used.
  4. Recorded the limits of each line of evidence, including that the 100,000-times processing figure rests on secondhand speed estimates and that Apple's announcement is self-interested marketing.

Editorial note: Scope: this article checks only whether a modern iPhone has more raw computing capacity (processing speed and memory) than the computers aboard Apollo 11. It does not compare reliability, radiation tolerance or suitability for spaceflight. The processing multiplier of over 100,000 comes from one computer scientist's 2019 estimate built on secondhand speed figures; the memory comparison and the clock comparison rest on published specifications. No external specialist review has been recorded.

Expert-review status

No external specialist review has been recorded.

Funding and conflicts

Funding: No external funding for this piece.

Ownership: FactHub is an independent fact-checking site; no outside party owns or directs this article.

Conflicts: None known. Apple's own press release is cited for current iPhone specifications, and its interest is flagged in the source notes.

Sources

Sources are labeled by kind, with what this fact check takes from each, so readers can check the evidence independently.

  1. Government NASA History Office. Computers in Spaceflight: The NASA Experience, Chapter 2: The Apollo guidance computer: Hardware

    NASA's official history of its onboard computers, by historian James E. Tomayko, describing the Apollo Guidance Computer's hardware, memory and testing.

    Reliability: Published by NASA about its own program, drawing on MIT Instrumentation Laboratory and contractor records. It is candid about the computer's limits, including memory shortages, so it has no evident stake in overstating or understating its power.

    • The Apollo Guidance Computer's clock ran at one megahertz.

      What the source says
      the memory, memory electronics, analog alarm devices, and the clock, which had a speed of one megahertz
      The Apollo guidance computer: Hardware, packaging paragraph

    • The computer's final memory was 36K words of fixed memory and 2K words of erasable memory.

      What the source says
      Fixed memory leapt to 24K and then finally to 36K words, and erasable memory had a final configuration of 2K words.
      Memory section

    • To save size and weight, a single adder circuit did all of the computer's arithmetic.

      What the source says
      To further reduce size and weight, the Apollo computer was designed with a single adder circuit
      The Apollo guidance computer: Hardware, before the Memory section

    • Qualifies: Apollo computers were tested against spaceflight stresses such as vibration, shock, vacuum and temperature, which raw computing power does not address.

      What the source says
      Post-production hardware tests included vibration, shock, acceleration, temperature, vacuum, humidity, salt fog, and electronic noise.
      Production Problems and Testing
  2. Academic Graham Kendall, University of Nottingham (via World Economic Forum). Would your mobile phone be powerful enough to get you to the moon?

    A 2019 essay by Graham Kendall, professor of computer science at the University of Nottingham, first published in The Conversation and republished by the World Economic Forum, comparing the Apollo computer with phones and calculators.

    Reliability: Written by a computer science professor with no stake in Apple or NASA. His memory figures follow NASA's history, but his speed figures (0.043 MHz for Apollo, about 2,490 MHz for the iPhone) are secondhand estimates he attributes to other websites.

    • The Apollo computer's working memory was 32,768 bits.

      What the source says
      This means that the Apollo computer had 32,768 bits of RAM memory.
      Paragraph on the Apollo Guidance Computer's memory

    • Phones of 2019 typically had 4 GB of working memory, more than a million times the Apollo computer's.

      What the source says
      the latest phones typically have 4GB of RAM. That is 34,359,738,368 bits. This is more than one million (1,048,576 to be exact) times more memory than the Apollo computer had in RAM.
      Phone memory and processing

    • Using estimated speeds, a 2019 iPhone had over 100,000 times the Apollo computer's processing power.

      What the source says
      This means that the iPhone in your pocket has over 100,000 times the processing power of the computer that landed man on the moon 50 years ago.
      Phone memory and processing

    • Qualifies: The iPhone speed figure is an outside estimate, because Apple does not publish clock speeds.

      What the source says
      Apple do not advertise the processing speed, but others have calculated it.
      Phone memory and processing

    • Even school calculators from 1998 and 2004 ran faster than the Apollo computer.

      What the source says
      With regard to processing speed, the TI-73 was 140 times faster than the Apollo computer and the TI-84 was almost 350 times faster.
      What about a calculator?
  3. Industry Apple. Apple unveils iPhone 17 Pro and iPhone 17 Pro Max, the most powerful and advanced Pro models ever

    Apple's September 9, 2025 press release announcing the iPhone 17 Pro and its A19 Pro chip.

    Reliability: Has a stake in this finding. Apple's own marketing for a product it sells, so it benefits from describing the chip as powerful. It gives no clock speeds or operation counts, and is used here only to show that current iPhones exceed the 2019 model compared above.

    • Apple describes the 2025 iPhone 17 Pro's chip as having a six-core CPU and Neural Accelerators built into each GPU core.

      What the source says
      The 6-core CPU is the fastest CPU in any smartphone, and the 6-core GPU architecture includes Neural Accelerators built into each GPU core, a larger cache, and more memory than A18 Pro.
      A19 Pro: The Most Powerful and Efficient iPhone Chip Ever
  4. Other Ken Shirriff. A circuit board from the Saturn V rocket, reverse-engineered and explained

    A 2020 analysis by computer historian Ken Shirriff of a circuit board from the Saturn V's guidance system, describing the rocket's Launch Vehicle Digital Computer and citing IBM and NASA manuals.

    Reliability: Independent researcher who restores and reverse-engineers vintage computers, including an Apollo Guidance Computer; not affiliated with NASA, IBM or Apple. The post links the IBM and NASA manuals it relies on.

    • The Saturn V rocket was steered by its own computer, the Launch Vehicle Digital Computer, from liftoff toward the Moon.

      What the source says
      The Saturn V was guided and controlled by the Launch Vehicle Digital Computer (below), from liftoff into Earth orbit, and then on a trajectory towards the Moon
      The Launch Vehicle Digital Computer (LVDC) and Launch Vehicle Data Adapter (LVDA)

    • The rocket's computer performed about 12,000 instructions a second.

      What the source says
      The downside was that it was very slow, performing 12,000 instructions a second.
      The Launch Vehicle Digital Computer (LVDC) and Launch Vehicle Data Adapter (LVDA)

    • By 2020 an iPhone processor already had over 8 billion transistors.

      What the source says
      Now, an iPhone processor has over 8 billion transistors.
      Conclusion

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