How to read photocopier speed specs without getting fooled by PPM versus IPM
Open a Canon iR-ADV C5760i brochure and the speed line reads 70 ppm color in A4. Open the equivalent Ricoh IM C6010 brochure and the same line reads 60 ipm color in A4. Two different machines. Two different units. Two different numbers that mean almost the same thing on monochrome jobs and very different things on duplex color. Catching the unit difference and adjusting for it changes the comparison between competing quotes by anywhere from 10 to 50 percent.
Two acronyms. PPM and IPM. The arithmetic between them depends on whether the page being measured is single sided or two sided.
What each acronym counts
PPM stands for pages per minute. The classic counting method. A page is a single sheet of paper, regardless of whether one side or both sides have been printed on. A 60 ppm machine outputs 60 sheets per minute on simplex jobs. The same machine on duplex jobs outputs roughly 30 to 35 sheets per minute, since it has to expose, transfer, and fuse two sides on each sheet, with paper inversion and re feeding adding handling time between the two sides.
IPM stands for images per minute. An image is a single side of a sheet, regardless of whether the sheet has one or two sides used. A 60 ipm machine outputs 60 images per minute on simplex, where each sheet equals one image. The same 60 ipm machine on duplex jobs continues to output 60 images per minute, where each sheet now equals two images. The arithmetic of converting between the two units depends on the duplex throughput characteristics. The deeper read on duplex paper handling and what the inverter mechanism inside the chassis does is at A guided tour of every part inside a modern office copier.
Why the units exist as two separate things
PPM was the dominant unit through the 1990s when most office copiers ran simplex jobs and duplex was an optional add on. The number described what the user saw coming out of the machine, sheets per minute. Duplex throughput was reported separately, often as a footnote, and the gap between simplex and duplex on older RADF designs was visibly wide.
IPM emerged in the 2000s as duplex printing became standard and as single pass duplex feeders eliminated the throughput gap. ISO and IEC standardized the metric in 2009 under ISO/IEC 24734, which defined a controlled testing method using a standardized document set. The standardized test gives PPM and IPM numbers that can be compared across brands rather than relying on each manufacturer's internal benchmarks.
Why the standardization mattered. Before ISO 24734, manufacturers tested speeds under conditions that favored their own products. Test pages chosen to be easy to rasterize. Continuous runs without warm up overhead. Memory allocations sized for the job. The headline numbers on brochures often exceeded real world office throughput by 30 to 50 percent. The case for the segment classification system stepping in to provide a more reliable shorthand for buyers, given that even the standardized speed numbers can be gamed at the margin, sits at What the industry copier segments from one through six actually mean for you for the deeper read.
Doing the math between the two units
For pure simplex jobs, PPM and IPM produce the same number on the same machine, because each sheet equals one image. A 60 ppm simplex job is also a 60 ipm simplex job. The two metrics diverge only when duplex enters the picture.
For duplex jobs on a single pass duplex machine, the conversion is simple. IPM equals two times PPM. A 60 ppm duplex rate translates to 120 ipm. Conversely, a machine quoted at 60 ipm in duplex mode runs at 30 ppm if the user is counting sheets through the output tray. The Canon iR-ADV C5760i, rated at 70 ppm color in A4 simplex, runs at 70 ipm color in A4 duplex on its single pass duplex configuration, which translates to 35 sheets per minute.
For duplex jobs on an older RADF style machine, the conversion is messier because the duplex throughput drops faster than half the simplex rate. A 70 ppm machine with RADF often delivers 25 to 30 ppm duplex rather than the 35 ppm a single pass duplex machine would give. Reading the spec sheet's separately listed simplex and duplex rates reveals which feeder design is fitted, and the gap between the two numbers tells you whether the unit uses RADF or single pass. The differences between the two feeder mechanisms are unpacked at Document feeder types from ADF to RADF DADF and SPDF made simple.
The brand convention split
Canon and Konica Minolta typically report PPM in their primary spec lines, sometimes accompanied by IPM as a secondary figure. Ricoh and Sharp often lead with IPM. Xerox uses both, depending on the product line, with VersaLink units leaning toward PPM and AltaLink units toward IPM. HP varies by product family.
Why the convention split matters. Two competing dealers presenting two competing machines may quote one as 60 ppm and the other as 60 ipm. On simplex jobs the comparison is fair. On duplex jobs the IPM machine is twice as fast as the PPM machine. A buyer who treats the two numbers as equivalent without checking units ends up making a comparison that favors whichever brand uses the more generous unit convention.
The simple defense is to ask the dealer for both PPM and IPM on the same machine for both simplex and duplex. The four numbers together describe the throughput envelope completely. Most spec sheets list all four somewhere if you read past the first line. Where this becomes important is in heavy duplex workflows like accounting firms during tax season, legal exhibit printing, or HR departments running employee onboarding packets, since the duplex rate is what determines actual throughput on those jobs.
What the speed numbers do not tell you
Speed specifications, whether PPM or IPM, describe sustained throughput on continuous runs. They do not describe what happens at the start of a job. First page out time, the FPOT spec, is a separate number that captures how long the machine takes from receiving a print job to producing the first sheet. FPOT runs between 4 and 10 seconds on most office MFPs and is dominated by fuser warm up and rasterization time rather than by the engine's continuous speed.
For an office that runs many small jobs of 1 to 5 pages, FPOT matters more than PPM or IPM. A 60 ppm machine with 9 second FPOT spends 9 seconds on overhead and 1 second on output for a 1 page job. A 35 ppm machine with 4 second FPOT spends 4 seconds on overhead and 1.7 seconds on output, finishing the same job 4 seconds earlier despite being slower on continuous runs. Reading FPOT alongside PPM and IPM tells you whether the machine is built for short bursts or for long runs.
The mistake that comes from reading speed specs in isolation. An office with mostly short bursts buying the highest PPM machine on the floor ends up with a chassis that takes longer per job than a smaller machine would have, despite the bigger spec number. The rule is to match the speed metric to the job profile rather than to maximize the headline figure. Where this connects to the larger conversation about sizing equipment to actual workload, the deeper read is at How to tell whether you need an office class copier or a production class one.
Real model comparisons
Take three machines often quoted in the same Spanish SMB segment. Canon iR-ADV C3826i. Ricoh IM C3010. Xerox AltaLink C8035. The brochures advertise 38 ppm color, 30 ipm color, and 35 ppm color respectively. Naively the Canon looks fastest. Pulling the duplex numbers reveals more.
The Canon C3826i runs 38 ppm color simplex and 30 ipm color duplex, which translates to 15 sheets per minute on duplex. The Ricoh IM C3010 runs 30 ipm color simplex and 30 ipm color duplex, both translating to 30 ipm and to 15 sheets per minute on duplex. The Xerox AltaLink C8035 runs 35 ppm simplex and 35 ipm duplex, translating to 17.5 sheets per minute on duplex.
On simplex Canon wins by speed. On duplex Xerox wins. Ricoh ranks third on both. The three machines compete in the same segment and at similar prices, but the speed picture varies depending on the workload mix. A buyer running mostly simplex picks Canon. A buyer running mostly duplex picks Xerox. A buyer with mixed workloads picks based on other factors. The deeper read on which segment band these three machines occupy and how that determines monthly volume capacity is at What the industry copier segments from one through six actually mean for you.
Coverage and other speed test conditions
ISO 24734 specifies test conditions including page coverage at 5 percent for monochrome and a defined color test pattern for color. Real office documents tend to land between 4 and 8 percent coverage, so the rated speeds approximate real conditions for typical text documents. Heavy graphics jobs, dense color photos, or pages with full bleed backgrounds run slower than the rated speed because the controller takes longer to rasterize and the engine takes longer to deposit toner.
For an office that prints mostly text, the rated speed is reasonably accurate. For an office that prints marketing collateral, photo heavy reports, or design proofs, real throughput often runs 20 to 40 percent below the rated speed. Asking the dealer for representative throughput on the office's actual document mix sometimes produces useful information, although most dealers do not have data at that resolution and will quote the standard ISO numbers.
Toner consumption also varies with the same coverage factor. A 5 percent coverage page consumes less toner than a 12 percent coverage page. Service contracts assume the standard ISO coverage as a baseline, with overage rates kicking in if average coverage runs significantly higher than the assumed level. Where this connects to the cost per page calculation that ultimately matters more than speed on most office decisions, the read is at The difference between duty cycle and recommended monthly volume and why it matters.
How to compare two quotes correctly
Pull both PPM and IPM numbers for both simplex and duplex on each candidate machine. Most spec sheets list all four somewhere. If the dealer cannot provide all four, the spec sheet from the manufacturer website lists them.
Match the speed metric to the job profile. If the office runs mostly simplex single page documents, prioritize FPOT and PPM simplex. If the office runs mostly duplex multipage documents, prioritize PPM duplex and IPM duplex. If the workload mixes both, look at the average of the two figures weighted by the actual job profile.
Validate the rated speed by asking for a demonstration on representative documents. Most dealers will run a demo on a sample of the office's actual print output if asked, and the demo throughput is more reliable than the brochure number. Demonstrations also reveal whether the machine handles the office's specific paper stock, finishing requirements, and color reproduction needs, none of which show up clearly on speed specs alone. The everyday distinction between a printer and an MFP, and how the speed conversation differs between the two categories, is at How a photocopier differs from a printer an MFP and a copier in everyday office life.
PPM counts sheets. IPM counts sides. The two metrics agree on simplex and diverge on duplex. Reading both numbers, paying attention to the units, and matching them to the actual job profile reveals more about real throughput than reading the headline figure alone. The brand convention split between PPM and IPM exists, the conversion math is simple, and dealing with it correctly avoids the common pitfall of comparing two machines using two different yardsticks.