Alright, let’s be real—if you’re in the market for magnetic flip top boxes (or you’re just here because you messed up measuring one last time), you know accurate dimensions make or break everything. I’ve been selling these bad boys for 7 years now, and let me tell you: half the headaches my customers complain about? They’re not from a bad product—they’re from bad measurements. Like, last quarter a small Etsy seller ordered boxes for their candle jars and got ones ¼ inch too narrow because they measured the outside of the lid instead of the inside of the base. Oops. So today, I’m walking you through exactly how to measure a magnetic flip top box like a pro—no fancy lab tools required, just stuff you probably already have lying around. Magnetic Flip Top Box
First, let’s get one tiny thing straight: magnetic flip top boxes have two main parts, right? The base (that’s the bottom part that holds your stuff) and the lid (the top part that flips over and sticks to the base with those little magnets). You can’t just measure the whole thing like a shoebox—you need to measure each part separately, because that’s what determines if it’ll actually close, fit your product, and look good. I see so many people skip this step and end up with boxes that either won’t snap shut or have a gap big enough to fit a credit card. Not cool.
Let’s start with the tools, because you don’t need anything fancy here. A basic 12-inch/30cm ruler works for most standard sizes, but if you’re dealing with really small boxes (like for jewelry or lip balm), a digital caliper is way better—you can grab one for $10 on Amazon, no big deal. A piece of paper and a pen (or your phone notes) to write down numbers, because you’ll need three measurements for each part, and mixing them up is the worst. Oh, and if you don’t have a ruler, a standard credit card is ~3.37 inches long, so that’s a quick backup for small spots.
First up: the base. This is the most important part because it’s where your product goes, right? If the base is too small, your stuff won’t fit. If it’s too big, the product will rattle around. So for the base, we need three measurements: length, width, and depth (or height—same thing, whatever you call it). Wait, hold on—when measuring length and width, you have to measure the inside of the base, not the outside. Because the walls of the base have thickness, duh. If you measure the outside, you’ll get a number that’s bigger than the actual space inside, which is what matters. How to do that? Set the base on a flat table, open the top so you can see the empty cavity. Line up the 0 mark of your ruler with the left inner wall, then measure to the right inner wall. Write that down as inner length. Do the same for width: front inner wall to back inner wall. Easy. Now the depth: stick the ruler straight down into the base, from the top inner edge of the base wall to the bottom of the base. Make sure you’re not just measuring the total height of the base—you want how deep the inside is, because if your product is taller than that, it’ll stick out of the base, and the lid won’t close. Wait, quick side note: if you’re dealing with a base that has a flap or a little notch for the lid to sit on, make sure the depth measurement goes all the way to the bottom of that notch, not the flat bottom of the base. That’s another mistake people make.
Now the lid. The lid is trickier because it has to fit snugly over the base, not just be bigger or smaller. If the lid’s inner length is too big, it’ll slide off. If it’s too small, it won’t go on at all. But wait—magnetic flip top lids have two sides too: the outer part (the part you see when the box is closed) and the inner rim (the part that sits over the base). So here’s what you need to measure for the lid: first, if you want the finished size of the box (like how big it looks from the outside when closed), measure the outer length and outer width of the lid. That’s just the left outer edge of the lid to the right outer edge, front to back. But the actual critical measurement is the inner rim of the lid—because that’s what goes over the base. So for the inner rim, measure the space inside the part that hangs over the base. That number should be almost exactly the same as the outer length and width of the base, right? Wait, almost—usually, we leave a tiny 1/32 inch gap so the lid can open and close easily without sticking. But don’t go too big, or the gap will be visible. Also, measure the height of the lid: that’s how tall the lid is from the top of the outer lid to the bottom of the inner rim. Important if you’re putting a label on top of the lid—you need to know how much space you have.
Wait, hold on—what if you’re measuring a box that’s already assembled? A lot of my customers come to me with a box they bought somewhere else that doesn’t fit their product, so they need a replacement. If it’s already put together, don’t just measure the whole closed box. Take it apart first—gently, because the magnets are strong and you don’t want to crack the lid or base. Once it’s apart, follow the same steps: measure base inner length/width/depth, lid inner rim length/width, and lid outer length/width if you need the finished size. I once had a customer who tried to measure the closed box’s length and width, and it was off by ¼ inch because the lid overlaps the base. That’s exactly why taking it apart is key—even if it seems like a hassle, it saves you from ordering the wrong thing.
Another thing to watch out for: magnetic flip top boxes usually come with different corner styles—right angle (sharp corners) or rounded corners. If you’re measuring rounded corners, don’t measure across the curve! For example, if a base has a 2-inch rounded corner, the actual inner length is still from the flat left inner wall to the flat right inner wall, not across the rounded corner. I saw a guy last month measure a rounded base from tip to tip of the curve and order a box that was ½ inch too small. He was mad at me at first until I explained what he did—then he ordered the right size and left a 5-star review, so that’s a win.
What about custom sizes? A lot of my customers want boxes for unique stuff—like custom jewelry sets, small skincare samples, or even mini gadgets. If you need a custom magnetic flip top box, you have to give me exact measurements, and I always ask for the product dimensions first. Wait, no—don’t just give me your product’s length/width/height. Adjust for the box. For example, if you have a candle that’s 2 inches wide, the base inner width should be 2 inches, right? But wait, if the candle has a lid that sticks up, make sure the base depth is at least a little taller than the candle’s height so it doesn’t tip over. And when the lid is on, you need the total height of the closed box to be something that works for your packaging—like if you’re putting them in a shipping box, you need to factor that in too.
Wait, let’s do a quick example to make this concrete. Let’s say you have a set of stud earrings that are 0.5 inches long, 0.5 inches wide, and 0.25 inches tall. What measurements do you need for the box? Base inner length: 0.5 inches, base inner width: 0.5 inches, base depth: at least 0.3 inches (so the earrings don’t stick out). Then the lid’s inner rim needs to be 0.5 inches by 0.5 inches (with 1/32 inch gap total, so 0.503 inches if you want it super precise, but most people just go 0.5 inches and it works). The lid’s outer length/width would be like 0.6 inches, so it has a nice overhang when closed. That’s a perfect little box for studs—no rattling, closes tight, fits exactly.
Mistakes I see EVERY single day: measuring the outside instead of inside, not taking the box apart when it’s assembled, measuring rounded corners across the curve, and forgetting the depth. Let’s talk about that last one a second—depth is so important. If you’re putting something tall inside, like a lipstick tube that’s 3 inches tall, the base depth needs to be at least 3 inches, and wait for it—the lid’s height, when closed, plus the base depth has to be enough that the lipstick doesn’t stick out so far the lid won’t close. Oh right! So if the base is 3 inches deep, the lid’s inner rim height (the part that sits over the base) should be maybe 0.25 inches, so total closed height is 3.25 inches, and the lipstick sticks out 0.1 inches—perfect. If you just measure the base height instead of the inner depth, you’ll order a base that’s only 2.5 inches deep, and the lipstick won’t fit. That’s a classic mistake.
Another pro tip: if you’re measuring for multiple boxes, write down each measurement right after you take it—don’t rely on your memory. I once had a customer who ordered 50 boxes for their small batch soaps, and they mixed up the length and width measurements. They got 50 boxes that were ¼ inch too narrow, and they had to reorder. Total waste of time and money. So grab a piece of tape and label the base side “length” and “width” before you measure, so you don’t mix them up.
What about if you don’t have the actual box yet? Like, you’re designing a product and need to order magnetic flip top boxes to match. Just measure your product: for length, measure the longest part of your product, for width the widest, for height the tallest part. Then when you order, tell the supplier you need base inner length = product length, base inner width = product width, base depth = product height + 0.1 inches (to leave a little room so it fits). For the lid, inner rim length/width = same as base inner (or +1/32 inch for easy opening), lid outer length/width = base outer length + 0.2 inches (so it has a nice overhang, no gap). That’s the formula I use for all my custom orders, and it works 9 times out of 10.
Wait, quick note on magnets: not that you asked, but sometimes people think wrong measurements are the magnets’ fault. No—most magnetic flip top boxes use strong, small neodymium magnets, so if the lid is lined up right (which it will be if you measured correctly), it’ll snap shut and stay closed. The only time you get a gap is if the inner rim of the lid is too big, or the base walls are uneven. So measurement is 100% the key here.
Let’s recap, just to make sure you don’t forget anything: 1. Always separate the base and lid first. 2. Base: measure inner length, inner width, inner depth (not outside!). 3. Lid: measure inner rim length and width (that’s the part that goes over the base) and outer length/width (if you want the finished size). 4. For assembled boxes, take them apart gently—magnets are strong but don’t break them. 5. Rounded corners: measure across the flat sides, not the curve. 6. Write down every number immediately, label them so you don’t mix length and width.
Now, if you’re still confused—don’t sweat it. I’ve been doing this for 7 years, and I get that measuring tiny or tricky boxes can be frustrating. Every day, I have customers send me blurry photos of their box and write “can you tell me what size I need?” and I always tell them to follow these steps, but if they still need help, I’m here to chat. Whether you need a standard box for small products, a custom size for something unique, or just need to double-check your measurements before ordering, I’m happy to walk you through it. No pressure, no weird sales tactics—just real advice from someone who’s sold thousands of these boxes and knows exactly how to get it right.
Before you go, a quick last thing: when you receive your boxes, always double-check the measurements right away. Lay the base on the table, measure the inner length, and compare it to what you ordered. If it’s even 1/16 inch off, let the supplier know—good ones will fix it, no hassle. I always include a free measuring guide with every order too, just to make it easier for my customers.
Wait, that’s it! The whole thing is just about being specific, measuring the right parts, and not rushing. I can’t tell you how many people come to me saying “your boxes are trash” and it turns out they measured the outside of the lid instead of the inside of the base. Don’t be that person. Follow these steps, and you’ll get boxes that fit perfectly, close tight, and make your products look way more professional.
Drawer Box If you’re ready to order magnetic flip top boxes (standard or custom), or you just have a quick question about measurements, hit me up—I’m here to help. No scripts, no hold times, just actual answers. Let’s make sure you get exactly what you need.
References
- Packaging Digest. "How to Measure Rigid Boxes for Custom Orders." 2023.
- The Box Maker’s Association. "Standard Measurement Guidelines for Magnetic Flip Top Packaging." 2022.
- DIY Packaging Blog. "Pro Tips for Measuring Folding Boxes Accurately at Home." 2021.
Humen Hengyue Paper Products Factory
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