Do you have three nail files in your makeup bag and use whichever one you happen to grab? It might be time to stop. The designations 80, 100, 150, 180, or 240 are not random manufacturer numbers – they tell you how strongly the file will act on the nail. And the difference is really big: the one you can easily use to shape gel might be far too aggressive for a natural nail plate.
If you do your own manicure or pedicure at home, knowing one simple rule will help you file your nails faster, more precisely, and above all, safer.
Table of Contents ▾
- What does nail file grit mean?
- Nail file grits 80, 100, 150, 180, and 240 (Table)
- Types of nail files: from 80 to 240
- How to properly file natural nails?
- Be careful not to over-file
- Filing nails before a hybrid manicure
- Which nail file for a pedicure?
- Paper file, glass file, or buffer block?
- Nail file or nail drill – what do you really need?
- Which nail file grit will be best for beginners?
What does nail file grit mean?
The number placed on the file indicates the number of abrasive grains per specific surface area. In practice, the most important is a simple rule:
- low grit = coarser grain and stronger abrasion,
- high grit = finer grain and gentler filing.
An 80 grit file will therefore be very strong, while a 240 is much subtler. And what does the 100/180 designation mean? The file simply has two sides with different grits. One is stronger, the other gentler, so you can perform different stages of work with a single tool.
Nail file grits 80, 100, 150, 180, and 240
The easiest way? Look at the table.
| Grit | How strong is the file? | What is it for? | Natural nail plate? |
|---|---|---|---|
| 80 | very sharp | shortening and shaping hard material, e.g., gel or acrylic | no |
| 100 | strong | shortening and shaping gel or acrylic stylings | no |
| 150 | medium strong | shaping and smoothing gel mass, shape correction | probably not |
| 180 | medium/gentle | shaping, developing stylings; when used properly, also for the natural nail plate | yes, carefully |
| 240 | gentle | shortening and shaping natural nails, working with a thin and delicate nail plate | yes |
One rule is particularly important: we do not use 80 and 100 grit files to file the natural nail plate. These are tools designed primarily for working with hard material.
Types of nail files: from 80 to 240
80 grit file – the heavyweight contender
The 80 grit is one of the strongest abrasives found in nail styling files. It is not a file we use to gently correct the shape of natural nails before painting them with polish.
It works best when working with hard materials – e.g., when shortening and initially shaping gel or acrylic mass.
If you are doing a manicure on a natural nail plate, leave the 80 grit file in the drawer. Better yet, don't even open that drawer.
100 grit file – for developing stylings
The 100 grit file is still a strong tool. It is useful for shaping extended nails and developing gel or acrylic mass.
Popular 100/180 files are exactly why they are so versatile in a stylist's work. The 100 side allows you to work the material more strongly, while the 180 side allows for a more precise finish.
However, this does not mean that you should use the 100 side to "incidentally" shorten a natural nail. Too aggressive an abrasive can cause micro-damage and promote the splitting of the nail plate.
150 grit file – the golden mean for gel styling
The 150 grit is located between the strong 100 file and the much gentler 180. It is useful when shaping gel mass, correcting the shape, and smoothing the surface of the styling.
It gives you more control than a very strong abrasive, but still allows you to remove material relatively quickly. It's a good choice for nail styling, but it's not our first choice for simply shortening the natural nail plate.
180 grit file – the most versatile?
If there was to be only one file in your cosmetic bag, it would probably most often be the 180. It can be used to develop stylings, correct the shape, and, with the right technique, also to shape healthy natural nails. In professional manicures, this is one of the most common grits.
For very thin, brittle, and splitting nails, however, it is better to reach for a gentler 240 grit.
240 grit file – the best for a delicate natural nail plate
If your goal is primarily hand care and natural nails, it is worth making friends with a 240 grit file.
A fine abrasive allows you to gently shorten nails, smooth the free edge, and shape it without aggressive filing. This is a particularly good choice for thin, soft plates or those prone to splitting.
Of course, the work will be slower than with a 100 grit file. In this case, it is an advantage, not a disadvantage.
How to properly file natural nails?
Choosing the right grit is only half the battle. The second is technique. Natural nails are best filed dry, using a gentle file, e.g., 180 or 240 grit. Start from the sides and gradually give the free edge your chosen shape. Do not press the file harder just because you want to finish faster – a properly chosen abrasive should do the work for you.
It is also worth controlling the movements of the file. Instead of aggressively "sawing like a violin during a concert finale," work calmly and precisely. For thin and splitting nails, guiding the file in one direction is a particularly good solution.
When finished, check the free edge of the nail. It should be smooth, without unevenness and snags.
Be careful not to over-file
In the case of a natural nail plate, the "harder means better" rule definitely does not apply. Too aggressive a file, excessive pressure, or repeatedly working the same spot can lead to thinning and weakening of the nail. If the plate has become exceptionally thin, red, sensitive, or reacts with discomfort to touch and temperature, it is worth checking if it has not been over-filed. You can find more characteristic symptoms and tips in our guide "Excessive filing - how to recognize an over-filed nail plate?".
Do not choose a grit based on the rule "a stronger file will do it faster". We choose the file primarily for the material we are working with. Hard gel needs a different grit than a natural, thin plate. With natural nails, gentler work gives more control and reduces the risk of damage.
Filing nails before a hybrid manicure – what to choose?
Before applying a hybrid manicure, first give your natural nails the right length and shape. You can use a 180 or 240 grit for the free edge, depending on the condition and thickness of the plate.
However, remember an important difference: filing the free edge and matting the surface of the plate are not the same thing. The surface of a natural nail should not be aggressively abraded with a file. To gently prepare the plate, a properly selected buffer/polishing block is used according to the procedure of the styling performed.
Filing the natural nail too hard will not increase the durability of the manicure. Instead, it can make the plate thin and hypersensitive.
A file is just the beginning of nail plate preparation
A beautiful hybrid manicure starts long before applying the first layer of color. What matters is giving the right shape, preparing the cuticles, gently preparing the nail surface, and thoroughly cleansing the plate. Mistakes at this stage can later mean air pockets, chipping, or a shorter durability of the styling. If you are doing hybrids yourself, also check out the guide "How to properly prepare nails for a hybrid?", in which we discuss the entire process step by step.
Which nail file for a pedicure?
During a pedicure, exactly the same rule applies: we choose the tool for the surface we are working on, and not for how quickly we want to finish the treatment.
For shortening and shaping natural toenails, it is worth choosing gentler grits. Particular attention should be paid to the method of shaping - toenails should not be excessively rounded on the sides, as this may promote ingrowing problems.
Also, a strong nail file should not be treated as a tool for abrading calloused skin on the heels. Foot skin care and nail plate preparation require different products and tools.
Paper file, glass file, or buffer block?
Grit is not the only thing worth paying attention to.
- Paper files are most often used during gel and hybrid styling. They come in many grits, making it easy to match them to a specific stage of work.
- A glass file is a great solution for home care of natural nails. It is delicate and allows you to precisely smooth the free edge.
- A buffer or polishing block, on the other hand, is used to gently prepare and smooth the surface. It does not replace a classic file when shortening a long nail.
Nail file or nail drill – what do you really need?
For a basic home manicure, a good file can be completely sufficient for shaping and preparing stylings. A nail drill, however, allows you to significantly speed up some stages of work, especially when removing mass or performing a more advanced manicure. However, it is not a device that must be used at all costs - it requires appropriate technique, correct drill bits, and pressure control. Wondering if you really need one? Read "A nail drill for hybrid manicures - is it necessary?".
Which nail file grit will be best for beginners?
A good file really makes a difference. The grit 80, 100, 150, 180, or 240 is not a random number printed on the file. It determines its abrasiveness, and thus, what stage of a manicure or pedicure it will be suitable for. The most important rule? Choose the tool for the material and condition of the nail, not the other way around. A delicate natural nail plate does not need aggressive filing, and a thick layer of gel does not require tedious work with the gentlest file.
In hand and nail care, precision wins over strength. A good file, the right grit, and proper technique allow you to achieve more than the most energetic filing - and your nails will definitely thank you for it.
