Almost every new user asks this at least once: data packs last until you use them up and never expire, which feels safer; monthly plans cost less per GB and reset every month, which feels cheaper. Which one wins comes down to a single thing — how much data you actually use in a month. Below, three typical usage patterns are converted into concrete numbers, followed by a comparison table.
First, the difference between the two billing models
VPNNK bills along two separate lines with completely different rules — mixing them together will throw off your math.
- Monthly plans: ¥9.9/month for 60GB, ¥18/month for 250GB, ¥28/month for 500GB. Data resets every month on your activation date, and unused data does not roll over; if you upgrade mid-cycle, the price difference is prorated over the remaining days.
- Data packs: ¥158/300GB, ¥358/1000GB, ¥658/3000GB. Use them until they run out, they never expire, and they are not tied to any month.
The key difference is the time dimension: a monthly plan is one payment per month, while a data pack is one payment per block of data. If your usage suddenly doubles in a given month, a monthly plan means either upgrading a tier or waiting for the reset; a data pack simply draws from the pool, and when you use it has no effect on its validity.
Monthly data estimates for three typical usage patterns
The three sets of figures below are converted from common bitrates and usage frequencies. The goal is to give you an order of magnitude, not an exact bill. Match your own habits to the nearest tier.
Light browsing: 8–20GB per month
Typical scenarios are looking things up, sending and receiving email, scrolling social media, and the occasional short video. Web pages and text-heavy content use very little data — usually under 200MB an hour; short videos run 0.7–1.5GB per hour. At about an hour a day, you land in the 8–20GB range over a month.
Long-term streaming: 90–260GB per month
This is the heaviest data scenario. 1080p streaming runs about 1.5–3GB per hour, and 4K about 7GB per hour. Two hours of 1080p a day works out to roughly 90–180GB a month; switch to 4K at three hours a day and you pass 250GB with room to spare. For the same show, the gap between resolutions is bigger than the gap between platforms.
Remote work: 30–70GB per month
Video meetings are the biggest data consumer in a work scenario. An hour of 720p conferencing runs about 0.5–1GB, and 1080p about 1.2–1.8GB. Two hours of meetings a day plus document and code syncing for the rest of the time comes to roughly 30–70GB a month. File transfers and cloud drive syncing add more, depending on file size.
Putting your usage against both price tables
Compare the ranges above against monthly plans and data packs, and the conclusions fall into clear layers.
| Usage | Monthly data | Best-fit monthly plan | Equivalent data pack duration |
|---|---|---|---|
| Light browsing | 8~20GB | ¥9.9 / 60GB (plenty of headroom) | 300GB lasts about 15–37 months |
| Remote work | 30~70GB | ¥18 / 250GB (plenty of headroom) | 300GB lasts about 4–10 months |
| Long-term streaming | 90~260GB | ¥18 / 250GB or ¥28 / 500GB | 1000GB lasts about 4–11 months |
Light browsing: monthly plan for convenience, data pack for peace of mind
Under 20GB a month, the ¥9.9 60GB monthly plan leaves plenty of headroom, at about ¥119 a year. Buy the ¥158 300GB data pack instead and, at 15GB a month, it lasts about 20 months — roughly ¥8 a month. The unit price is slightly lower with the data pack, but you have to accept the mental accounting of paying once and using it slowly.
Long-term streaming: the monthly plan is almost always the better deal
For a viewer using around 200GB a month, the ¥18 250GB tier covers it exactly, at about ¥216 a year. The same usage on a data pack: the ¥358 1000GB pack lasts about 5 months, so a year needs more than two packs and costs over ¥700. The gap comes from the monthly plan's lower per-GB price, while the data pack folds the convenience of never expiring into its price.
Remote work: it depends on how your usage fluctuates
Work usage is steady and has a ceiling, so the 30–70GB range fits comfortably within the ¥18 250GB tier. If you only need it for business trips or specific months, a data pack is actually the better fit: the ¥158 300GB pack stretches across several quarters, and you don't pay for idle months.
Four edge cases that are easy to miss
- ✅ Usage doubles within a month: after upgrading a monthly plan, the price difference is prorated over the remaining days, and the month's allowance changes with the new tier.
- ✅ Frequent traveller: if you only use it heavily three or four months a year, a data pack wastes nothing on idle months.
- ❌ Saving unused monthly data for the next month: not possible. Data resets every month on your activation date, and the remainder does not roll over.
- ❌ Assuming a data pack expires: it doesn't. Data packs last until you use them up and never expire — which is also why their unit price is higher.
An estimation workflow you can apply yourself
- Look back at your actual habits over the past month: how long you watch video each day, how long you spend in meetings, and whether you download large files.
- Convert by bitrate: 1080p video runs about 1.5–3GB per hour, 4K about 7GB, and 720p meetings about 0.5–1GB per hour.
- Multiply your daily usage by the number of days you use it to get a monthly range, then add 20% headroom on top.
- Steady, continuous monthly usage: pick the closest of the ¥9.9 / ¥18 / ¥28 tiers. Intermittent or very low usage: pick from the three data pack tiers.
Does using multiple devices at once double the data?
No, it doesn't scale with the number of devices. There is no limit on simultaneous connections, but the data pool is shared across the whole account — two devices each streaming two hours of 1080p consumes four hours' worth. Extra devices cost nothing, but usage is counted together.
FAQ
How is the price difference calculated when upgrading mid-cycle?
When you upgrade, the price difference is prorated over the remaining days, and the month's allowance switches to the new tier immediately — no need to wait for the next reset date.
Can a data pack and a monthly plan be active at the same time?
Yes. When your usage exceeds the month's allowance, it draws from the data pack pool, so you don't have to change tiers on the spot.
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