The Best Budget Dive Computers Under $400 (2026)

Under $400 is a genuinely good place to buy a dive computer. You give up color screens, wireless air integration, and smartwatch features -- not safety, nitrox support, or reliability. Every unit here tracks depth, time, ascent rate, and your no-decompression limit, supports at least one nitrox mix, and comes from a brand with a real service and community reputation. This guide ranks the best of the budget field from published specifications and community consensus, uses approximate pricing because street prices move constantly, and flags the one stretch pick worth saving a little longer for. Whatever you buy, a computer tracks limits -- you dive within your training and certification.

What under $400 buys you -- and what it doesn't

At this level you get honest, readable computers with the fundamentals done right: clear displays, nitrox support, and usually a user-replaceable battery you can swap almost anywhere. What you generally do not get is a bright color or AMOLED screen, wireless air integration, or full smartwatch functionality -- those live higher up the ladder. That is a fair trade for most recreational divers, because a simple computer you can read and afford beats a feature-packed one you overpaid for. Prices below are approximate; always check the current number before you buy.

The best budget dive computers

1. Cressi Leonardo 2.0 -- Best budget overall

Often the least expensive computer genuinely worth owning, frequently landing around $200, the Leonardo 2.0 pairs one-button simplicity with a large, clear display and nitrox support. It is the default honest budget pick: nothing flashy, nothing missing for basic recreational diving. Check price on Amazon. Our Cressi Leonardo 2.0 review covers the one-button trade-offs.

2. Suunto Zoop Novo -- Best budget workhorse

Usually around $250 and often the rental-counter standard, the Zoop Novo brings a big backlit display, nitrox support, a user-replaceable battery, and Suunto's conservative RGBM algorithm. It is bulky and cautious, but famously dependable and travel-friendly, and learning on the same unit many shops issue is a bonus. Check price on Amazon.

3. Mares Puck Pro Ultra -- Best simple value

Typically in the same entry band as the Leonardo, the Puck Pro Ultra offers a straightforward interface, a clear display, and nitrox support, with a reputation for just working. If its display reads more clearly to your eye than the alternatives, it is an easy, affordable call. Check price on Amazon.

4. Aqualung i300C -- Best budget nitrox on the wrist

Usually a bit above the one-button units but still comfortably under budget, the i300C adds Bluetooth log download and Aqualung's dual-algorithm choice while staying compact, nitrox-ready, and running a user-replaceable battery. For digital log lovers on a budget, it is the value standout. Check price on Amazon.

5. Oceanic Geo 4.0 -- Top of the budget bracket

The Geo 4.0 sits at the top of this bracket, generally around $400 -- check the current price, since it is the one pick here that can drift over the line. For the money you get a watch-style computer small enough to wear daily, with nitrox support, dual algorithms, and a user-changeable battery. If a low-profile everyday form matters to you, it earns its place at the ceiling of the budget. Check price on Amazon.

The stretch pick just over budget: Shearwater Peregrine

It would be dishonest to leave out the Peregrine just because it usually lands a little over $400. If you can stretch, it brings a large color screen, a rechargeable battery, a simple menu, and a respected adjustable algorithm -- a genuine step up that many divers never need to upgrade from. Treat it as the buy-once option worth saving a few more weeks for, rather than a true budget unit. Check price on Amazon. Our Shearwater Peregrine review makes the case.

Where to save, and where not to

Save on the screen, the air integration, and the smartwatch extras -- a budget computer gives up convenience, not core function. Do not save by buying an off-brand unit with no service network or an unknown algorithm, or by skipping nitrox support you will likely want within a year. And never treat a cheaper computer as a reason to dive harder; the no-decompression limit is a ceiling on any unit, budget or premium. Keep whatever you buy serviced and its battery fresh -- the pre-dive readiness tool tracks both.

How to shop the budget tier

A few habits stretch a dive-computer budget. Watch for last-generation models: when a maker releases a new version, the outgoing one often drops in price while remaining a perfectly good computer. Shops and online listings run seasonal sales, especially in the winter off-season and around major dive shows, so a little patience saves real money. Bundles -- a computer packaged with a first regulator or a mask-and-fin kit -- can lower the effective price if you need the other gear anyway. A lightly used unit from a reputable diver can be a genuine bargain, provided you confirm its battery and service history. What you should not do is chase the absolute cheapest listing from an unknown brand, because a computer with no service network or an unclear algorithm is not a deal at any price.

Dive within your training

A budget computer is not a budget on safety. It shows limits and information; it does not plan or judge for you. Ascend slowly, do your safety stop, stay well under your no-decompression limit, and dive within your training and certification. This is gear research, not dive instruction.

Where to go next

New to computers entirely? Our best beginner dive computer picks frame the same field for first-timers, the full best dive computer hub adds the premium tier, and the buy vs rent gear breakdown covers whether to own at all. See every category on the best-of guides.