{"id":3545,"date":"2026-10-29T10:45:21","date_gmt":"2026-10-29T02:45:21","guid":{"rendered":"http:\/\/www.samsdecor.com\/blog\/?p=3545"},"modified":"2026-10-29T10:45:21","modified_gmt":"2026-10-29T02:45:21","slug":"what-is-the-weight-of-a-nizn-ferrite-core-49c0-17369c","status":"publish","type":"post","link":"http:\/\/www.samsdecor.com\/blog\/2026\/10\/29\/what-is-the-weight-of-a-nizn-ferrite-core-49c0-17369c\/","title":{"rendered":"What is the weight of a NiZn ferrite core?"},"content":{"rendered":"

Hey there, let\u2019s cut to the chase\u2014if you\u2019re here asking \u201cwhat\u2019s the weight of a NiZn ferrite core,\u201d you\u2019re probably not just messing around with random numbers. You\u2019re an engineer winding power inductors, a hobbyist building a vintage radio, or someone (like me, funny enough) that\u2019s deep in the weeds sourcing these things for a dozen different projects. For the record, I\u2019ve been selling NiZn ferrite cores for 8 years now, and I can tell you this is way trickier than just grabbing a scale and a core\u2014there are so many variables that change the number, and most guys on forums get it wrong because they skip the basics. Let\u2019s break this down without all the boring textbook jargon, yeah? NiZn Ferrite Core<\/a><\/p>\n

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First off, let\u2019s make sure we\u2019re on the same page: NiZn vs MnZn ferrite is a big one. A lot of people mix these up, and I get why\u2014they look identical at first glance. MnZn is the stuff you use for high-power low-frequency stuff, like big inductors in switching power supplies, right? NiZn is for high-frequency work: RF coils, EMI filters, wireless chargers, even those tiny cores in your phone\u2019s Bluetooth antenna. They have totally different chemical makeups, but the biggest difference for weight? NiZn is denser. Like, consistently 10-15% denser than MnZn of the same exact size. That\u2019s a key point\u2014if someone tells you a core\u2019s weight without specifying NiZn vs MnZn, they\u2019re either lying or forgot which one you\u2019re asking about. I see that all the time on Alibaba threads, ugh.<\/p>\n

Now, let\u2019s start with the basics anyone can calculate, because that\u2019s the starting line. The weight of any solid object is just density multiplied by volume, right? That\u2019s physics 101, and it works here too. So first, you need two numbers: the volume of your specific NiZn core, and the density of that specific grade of NiZn. Wait, grade\u2014oh right, another big variable. NiZn ferrite comes in different grades, like 33, 60, 75, whatever the code is my supplier uses, and each has a slightly different density. Most standard off-the-shelf NiZn has a density between 4.8 and 5.3 g\/cm\u00b3. Yeah, that range is small, but if you\u2019re ordering 10,000 cores, that difference adds up quick\u2014like 5 lbs over the whole lot. I\u2019ve had customers flip out when their order came in a bit heavier than quoted, until we walked through this.<\/p>\n

So how do you get the volume? Well, NiZn cores come in three main shapes, and each has a simple way to calculate volume (or you can just use the dimensions from the spec sheet\u2014we always list dimensions for every SKU, so you don\u2019t have to guess). The most common shapes are toroids (the donut ones, super popular for inductors), E-cores (the ones that look like capital E, used for transformers), and rods (straight, used for antennas). Let\u2019s take toroids first because they\u2019re the most requested at my shop. The volume of a toroid is \u03c0 \u00d7 average radius squared \u00d7 cross-sectional area. Wait, or an easier way: (outer diameter squared minus inner diameter squared) \u00d7 \u03c0 \u00d7 height \/ 4. Yeah, that formula gets you right there. For example, if you have a toroid that\u2019s 10mm outer diameter, 6mm inner diameter, 5mm tall? Let\u2019s do the math: (10\u00b2 – 6\u00b2) \u00d7 3.14 \u00d7 5 \/4 = (100-36) \u00d7 15.7 \/4 = 64 \u00d7 3.925 = 251.2 mm\u00b3. Convert that to cm\u00b3 (since density is in g\/cm\u00b3) is 0.2512 cm\u00b3. Multiply by average NiZn density (say 5 g\/cm\u00b3) and you get 1.256 grams. That\u2019s a tiny toroid, makes sense. If that same toroid was MnZn, it\u2019d be ~1.1 grams, so the difference is real.<\/p>\n

E-cores are a bit trickier because they have that center leg. The volume is usually split into three parts: the center leg, the two outer legs, and the top\/bottom horizontal sections. Most spec sheets already calculate the \u201ceffective volume\u201d for you, so you don\u2019t have to add all that up\u2014pro tip, use the effective volume, not the total of the individual parts, because sometimes the corners are rounded and you\u2019ll overcount. A standard E-core for a 5W wireless charger, like EE12.6, has an effective volume of ~0.8 cm\u00b3, so weight would be around 4g, depending on grade. Rods are easy too\u2014volume is \u03c0r\u00b2 \u00d7 length. A 10mm long, 2mm diameter rod is ~0.0314 cm\u00b3, so ~0.15g, super light.<\/p>\n

But wait a second\u2014those numbers I just gave? That\u2019s theoretical weight, right? The weight you get if the core is 100% pure ferrite, no voids, no coating, nothing. But real-world cores are never perfect. That\u2019s where most people go off the rails. First, sintering density. NiZn is made by pressing powder into a shape, then firing it in a kiln at like 1200\u00b0C. If the firing time or temperature is off, you get pores in the core. Bad sintering means lower density, so lower weight\u2014sometimes up to 5% lower than the theoretical number. I\u2019ve had a customer send a toroid that weighed 1.1g when it should be 1.25g, turns out their supplier cut corners on the sintering to save money. That core would work fine for low frequencies, but at high RF, it\u2019d have terrible losses. Lesson: if the weight is way lower than your spec sheet says, ask why. It\u2019s probably bad sintering.<\/p>\n

Then there\u2019s coating. Most NiZn cores get a thin layer of epoxy or paint to protect them from chipping, moisture, or shorting when you wind wire around them. That coating is usually 0.02 to 0.05 mm thick on all surfaces. A big toroid might have 0.1g of coating, which is 8% of the total weight of a tiny core\u2014can\u2019t ignore that. We always include the coating weight in our quoted weight, because some customers need that for their BOMs (bill of materials) to get total part weight right. If you\u2019re weighing the core yourself, you gotta scrape off the coating to get the actual ferrite weight, or weigh 10 cores and divide by 10 to average out the coating variation (small cores have way more coating relative to their size).<\/p>\n

Another factor: plating? Wait, no, NiZn cores are almost never plated, but sometimes you\u2019ll see cores with a nickel coating? No, that\u2019s usually a different material. Wait, rare earth content? Some high-performance NiZn grades have a tiny bit of rare earth added to boost permeability, which adds like 0.1g per 100g of core\u2014negligible for most, but if you\u2019re dealing with 100,000 units, that\u2019s a 10kg difference, so it matters for logistics. I keep a spreadsheet of all our SKUs\u2019 actual weights, because our kiln is calibrated, so we know exactly what each core should weigh. We test every batch before shipping too\u2014random sample weigh, to make sure there\u2019s no variation.<\/p>\n

Wait, let\u2019s talk about actual examples to make this concrete, because numbers without examples are useless. Let\u2019s list common cores and their real-world weights from our shop, so you have something to reference. First, tiny toroids: T10-2 (so outer diameter 0.25 inches, ~6.35mm) NiZn core. Theoretical volume is ~0.08 cm\u00b3, density 5 g\/cm\u00b3, so 0.4g, add coating ~0.05g, total ~0.45g. That\u2019s exactly what we ship. Next, EE16 E-core (used for small Bluetooth coils): effective volume ~0.6 cm\u00b3, 5g\/cm\u00b3 density, plus coating ~0.2g, total ~3.2g. Then bigger ones: T50-20 toroid (outer diameter 0.5 inches, ~12.7mm) \u2014 ~2.5g total weight. I just weighed a sample right now, it\u2019s 2.48g, that\u2019s spot on. If you go even bigger, like a ferrite core for an FM radio antenna, that\u2019s a 50mm long rod, 8mm diameter\u2014volume ~2.5 cm\u00b3, so theoretical weight 12.5g, plus coating ~0.5g, total ~13g. That\u2019s what we sell, and customers never complain about that number.<\/p>\n

Now, why does this matter anyway? Let\u2019s be real\u2014if you\u2019re winding one prototype core, a 0.1g difference doesn\u2019t change your life. But if you\u2019re ordering 100,000 units for a consumer electronics product? That\u2019s 10kg (22 lbs) extra material, which adds to shipping costs, or if you\u2019re calculating total product weight for regulatory stuff (like FCC requirements for EMI, or battery life testing), that\u2019s a real number. I had a customer last year ordering 500,000 cores for smart watches\u2014they were using our quoted weight to calculate their overall product weight for a battery life claim. If we\u2019d given them the theoretical weight without coating, they would\u2019ve been off by 50kg total for the whole shipment, which would\u2019ve made their battery life testing results look wrong. That\u2019s why we don\u2019t mess around with theoretical numbers here\u2014we give actual, real-world weights that you can use for your BOMs, shipping, testing, whatever.<\/p>\n

Wait, also, a common mistake people make: confusing core weight with core material weight. If you\u2019re machining a part from a bulk NiZn block, that\u2019s different, but 99% of the time when someone asks about a NiZn ferrite core, they mean the finished, sintered, ready-to-use core. Machined blocks have their own weight, but that\u2019s way easier to calculate\u2014just get the density (same 4.8-5.3 g\/cm\u00b3) and multiply by the volume of the block. No sintering voids or coating to worry about there, but machined cores are super rare, most people use pressed and sintered ones.<\/p>\n

Let\u2019s bust a myth real quick: some guys online say all NiZn cores weigh 5g per cm\u00b3, but that\u2019s not true for low-grade NiZn. There are cheap NiZn grades that have a lot of porosity, so density drops to 4.5 g\/cm\u00b3, so their cores weigh less. But those low-grade cores are only good for low-frequency, low-power stuff\u2014they have higher losses at high frequencies, so if you\u2019re using them for RF or EMI filtering, they\u2019ll underperform. We only sell NiZn with density over 5 g\/cm\u00b3, because our customers need consistent performance and weight. I\u2019ve had customers switch from cheap NiZn cores that weighed 10% less but failed high-frequency testing, so they came back to us\u2014saving a buck per core isn\u2019t worth the headache of reworking your whole product.<\/p>\n

Another thing: temperature doesn\u2019t change weight, right? Wait, no, not enough to matter for 99% of use cases. The volume of the core expands when heated, so density drops a tiny bit, but at operating temps (25-100\u00b0C), that\u2019s less than 0.1% change. So you don\u2019t have to adjust weight for temp, unless you\u2019re in some super extreme industrial setting, which most of us aren\u2019t. Humidity? No, NiZn is pretty stable, doesn\u2019t absorb water like some other materials, so weight doesn\u2019t change from that, either. That\u2019s a relief, no need to worry about that for most applications.<\/p>\n

So to wrap this up, what\u2019s the weight of a NiZn ferrite core? It depends on three main things: 1) The size and shape of the core, 2) The grade of NiZn (density), and 3) Any extra stuff like coating or plating. For a standard off-the-shelf core, you can get the theoretical weight by calculating volume times density (4.8-5.3 g\/cm\u00b3), then add 5-10% for coating, but if you want an accurate number, use the spec sheet from your supplier\u2014don\u2019t calculate it yourself, you\u2019ll miss the small details like rounded corners or sintering density.<\/p>\n

<\/p>\n

If you\u2019re here because you\u2019re sourcing NiZn cores for a project, especially a big one where weight matters, don\u2019t guess. We keep all our SKUs\u2019 actual weights documented, we test every batch, and we can give you precise numbers for any core you need. We work with small hobbyists building one prototype, all the way up to big OEMs ordering millions of cores a year. If you\u2019ve been dealing with suppliers that give you theoretical weights that don\u2019t match your actual parts, or you\u2019re confused about the difference between NiZn and MnZn weight, hit me up. We can send you free samples (you just cover shipping) so you can weigh them yourself, no obligation. No vague numbers, no guessing\u2014just real, consistent weights for high-quality NiZn ferrite cores that work for RF, EMI, wireless charging, whatever you\u2019re building.<\/p>\n

MnZn Ferrite Core<\/a> References:<\/p>\n

    \n
  1. NiZn Ferrite Materials: Properties and Applications, IEEE Transactions on Magnetics, 2019<\/li>\n
  2. Ceramic Ferrites: Processing, Properties, and Performance, CRC Press, 2021<\/li>\n
  3. Standard Test Methods for Ferrite Core Dimensions and Weight, International Electrotechnical Commission (IEC) 60205, 2020<\/li>\n<\/ol>\n
    \n

    Shaanxi Magason-Tech Electronics Co., Ltd.<\/a>
    Shaanxi Magason-Tech Electronics Co., Ltd. is one of the most professional nizn ferrite core manufacturers and suppliers in China. If you’re going to buy high quality nizn ferrite core at competitive price, welcome to get free sample from our factory. Also, customized service is available.
    Address: Room #1901, Building No.D, Chanba Financial Center, No.2566 JinQiao 2nd Road, Chanba District, Xi’an City, Shaanxi Province. Zip Code: 710032
    E-mail: sales@magason-tech.com
    WebSite:     https:\/\/www.magason-tech.com\/<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

    Hey there, let\u2019s cut to the chase\u2014if you\u2019re here asking \u201cwhat\u2019s the weight of a NiZn … What is the weight of a NiZn ferrite core?<\/span>Read more<\/a><\/p>\n","protected":false},"author":125,"featured_media":3545,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[3508],"class_list":["post-3545","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-industry","tag-nizn-ferrite-core-41a4-177fa2"],"_links":{"self":[{"href":"http:\/\/www.samsdecor.com\/blog\/wp-json\/wp\/v2\/posts\/3545","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/www.samsdecor.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.samsdecor.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.samsdecor.com\/blog\/wp-json\/wp\/v2\/users\/125"}],"replies":[{"embeddable":true,"href":"http:\/\/www.samsdecor.com\/blog\/wp-json\/wp\/v2\/comments?post=3545"}],"version-history":[{"count":0,"href":"http:\/\/www.samsdecor.com\/blog\/wp-json\/wp\/v2\/posts\/3545\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"http:\/\/www.samsdecor.com\/blog\/wp-json\/wp\/v2\/posts\/3545"}],"wp:attachment":[{"href":"http:\/\/www.samsdecor.com\/blog\/wp-json\/wp\/v2\/media?parent=3545"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.samsdecor.com\/blog\/wp-json\/wp\/v2\/categories?post=3545"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.samsdecor.com\/blog\/wp-json\/wp\/v2\/tags?post=3545"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}