In February 2024, a StorageReview server finished computing pi to 105 trillion digits after 75 days. The very last one is a 6.

In February 2024, StorageReview's server finished calculating pi to 105 trillion digits after a 75-day run, and the very last digit turned out to be a 6.

The number that ends this particular pursuit of pi is a 6. That is the 105-trillionth digit, and reaching it took a purpose-built server 75 days of continuous work — from December 14, 2023, to February 27, 2024 — as documented by the StorageReview Lab Team in their write-up, "105 Trillion Pi Digits: The Journey to a New Pi Calculation Record."

Pi never ends and never repeats, so any "record" is really a record of how far a machine can grind before someone builds a bigger one. StorageReview beat the previous mark of 100 trillion digits, set by Google Cloud in 2022, by five trillion.

How do you compute pi to 105 trillion digits?

You don't add up fractions by hand. Modern records rely on the Chudnovsky algorithm, a rapidly converging series published by brothers David and Gregory Chudnovsky in 1988. Each term of the series pins down roughly 14 additional digits, which makes it the standard workhorse for extreme pi runs.

The math is the easy part. The hard part is bookkeeping. A 105-trillion-digit number does not fit in a computer's memory — not even close. StorageReview's machine held about 1.5 TB of DDR5 DRAM and used roughly 1.36 TiB of it during the run, but the working data ballooned far beyond that. The calculation constantly shuttled enormous intermediate values between memory and disk, which is why storage, not raw compute, is the real bottleneck at this scale.

That is where the hardware becomes the story. The run used a dual-processor AMD EPYC 9754 "Bergamo" server — two 128-core chips for 256 cores total, with simultaneous multithreading switched off to keep the workload predictable. Attached to it were 36 Solidigm D5-P5316 solid-state drives, each holding 30.72 TB, for a combined capacity approaching a full petabyte. Solidigm confirmed the configuration in its own newsroom post, "Another Serving of Pi," noting that its SSDs stored nearly a petabyte of scratch data over the 75-day computation.

Why the storage matters more than the math

Live Science, in its February 2024 report "Pi calculated to 105 trillion digits, smashing world record," put the storage figure plainly: roughly one petabyte — a million gigabytes — spread across those 36 drives. For 75 straight days, the server wrote and reread that data in a nearly continuous churn.

That endurance is the actual engineering feat. Consumer SSDs are not built to be hammered around the clock for months; a single failure or a corrupted sector could invalidate weeks of work. The Solidigm drives were rated for exactly this kind of sustained, write-heavy abuse, which is what let the calculation survive to its final digit.

One detail is worth correcting, because it gets garbled in marketing shorthand. The build is sometimes described as a "dual-processor 128-core" machine. StorageReview's own spec sheet is clearer: two EPYC 9754 processors, 128 cores each, 256 cores in total. The confusion is understandable, but the record log is unambiguous.

The seam

Here is the part still open to argue about: what, exactly, is any of this for? The digits of pi past the first few dozen have no practical use — NASA has said that 15 or so digits are enough to navigate a spacecraft across the solar system with error smaller than an atom. Nobody needs the 105-trillionth digit to build anything.

What these runs actually test is hardware endurance, memory bandwidth, and the reliability of storage under punishing conditions. Pi is the benchmark; the machine is the point. StorageReview is a storage-review company, after all, and calculating trillions of digits is a spectacular stress test dressed up as pure mathematics.

So the record will fall again, as it always has, the moment someone with more drives and more patience wants to prove their gear can outlast the last team's. The 6 at the end is real, verified, and already provisional.