Loud Alarm Clocks That Actually Wake You Up

Disclosure: As an Amazon Associate and eBay Partner Network publisher, we earn from qualifying purchases. This doesn’t affect what we recommend or how we describe it.

How loud is loud enough to wake up someone who’s slept through every phone alarm, clock radio, and gentle chirp known to humankind? That’s the real question for anyone searching for the best loud alarm clocks: you want something that’s not just “louder than average,” but truly impossible to ignore—whether you’re a heavy sleeper, living with ADHD, or simply tired of snoozing through important mornings. This guide cuts straight to the two loudest contenders on the market right now, and helps you choose the one that actually fits your needs (and your budget).

Sharp Big Bang vs. Standard Digital: What Actually Matters for Loudness?

Most alarm clocks claim to be “loud,” but the difference between a standard digital beep and a true sonic blast is night and day. If you’re shopping for the best loud alarm clock, you’re probably not looking for a gentle nudge—you need a clock that can break through deep sleep or a distracted morning brain. Here’s where the two options on the market stand apart:

• The Sharp Big Bang Super Loud Alarm Clock is engineered for maximum volume—it’s positioned as the loudest pick in its class, specifically for people who have tried everything else and still can’t wake up on time.
• The Sharp Digital Alarm Clock is a classic digital unit that focuses on reliable alarm delivery at a much lower price. While not in the “sonic boom” range, it’s still a step up from your average phone or bedside clock, and is the clear budget pick here.

Both have their place: one is the nuclear option for the sleepiest among us, the other is a wallet-friendly solution for anyone who just needs a reliable, simple alarm that’s louder than a phone.

Side-by-Side Comparison: Which Loud Alarm Clock Fits You?

Pictured: Sharp Digital

Product	Condition	Price	Best For	Alarm Loudness	Display Type
Sharp Digital Alarm Clock	New	$	Budget, reliable everyday use	Up to 90 dB	Digital LED
Sharp Big Bang Super Loud Alarm Clock	New	$$$	Loudest wake-up, deep sleepers	113 dB	Analog

Price: $ = budget, $$ = mid-range, $$$ = premium — relative to the options compared above. Live prices and current stock are below.

How these alarm clocks made the shortlist

The focus here was simple: find the loudest alarm clocks available that are practical for everyday use. The main criteria were maximum alarm volume (measured in decibels), reliability of operation, ease of use (no fiddly setup required), and display clarity (digital vs analog). Alarm volume is the single biggest differentiator—most standard bedside alarms top out at 70–80 dB, but both of these options go well beyond that, with the Sharp Big Bang peaking at a whopping 113 dB (that’s louder than a chainsaw or a rock concert, per CDC guidelines on noise levels).

We compared the manufacturer-listed specs and stated features for each clock, prioritizing real-world wake-up power, not just marketing claims. Bundles, off-brand models with no stated loudness, and “novelty” clocks that don’t focus on alarm volume were excluded. If you want a smart alarm, sunrise lamp, or phone app, this isn’t your list—these are for people who need volume above all else. For anyone who needs gentle wake-ups or hates loud noise, skip this category entirely; you’ll be much happier with a vibrating alarm or a light-based solution.

The Sharp Digital: Best for Tight Budgets and Simple Needs

The Sharp Digital Alarm Clock is the clear pick when you just need a basic, louder-than-average alarm clock without bells, whistles, or a premium price tag. Its digital LED display is easy to read at a glance (even without glasses), and the alarm reaches up to 90 decibels—well above most standard clocks, and more than enough for most light to moderate sleepers. There’s no analog hand to fuss with, and setup is straight-forward: plug it in, set the time, set the alarm, done.

This model is ideal for students, kids’ rooms, or anyone who wants a reliable backup to their phone without spending extra. It’s not going to rattle your windows, but it will wake you up for class or work without draining your wallet.

The Sharp Big Bang: For Deep Sleepers and the Truly Hard to Wake

The Sharp Big Bang Super Loud Alarm Clock is in a league of its own for sheer volume. With a maximum alarm sound of 113 dB, it’s designed specifically for the heaviest sleepers, people with hearing loss, or anyone who’s managed to sleep through lesser alarms. To put that in context, 113 dB is louder than a jackhammer at close range, and about as much as you’ll ever want on a bedside table.

Unlike the Sharp Digital, the Big Bang uses an analog face, which some people find easier to check at a glance in the dark (especially if you’re used to traditional clocks). The extra volume comes with a higher price tag, but for those who need the loudest option available, nothing else on the list comes close. If you’ve tried every phone alarm, clock radio, or gentle chime and still wake up late, this is the option engineered for you.

Quick decision tree

• If budget is your top concern: Go with the Sharp Digital for a wallet-friendly, reliable alarm.
• If you routinely sleep through alarms: The Sharp Big Bang is made for you—choose it for maximum loudness.
• If you prefer a digital display: The Sharp Digital is your pick; simple, clear numbers for easy reading.
• If you want an analog face and don’t mind paying more: The Sharp Big Bang fits the bill.
• If you’re buying for a child’s room or dorm: The Sharp Digital is less likely to cause complaints from roommates or neighbors.

Frequently asked questions about loud alarm clocks

Verdict: Which Loud Alarm Clock Should You Actually Buy?

If you’re just looking for a reliable, budget-friendly alarm that’s louder than your phone, the Sharp Digital is your best bet. It’s simple, affordable, and will get the job done for most people. For those who have tried everything else and still can’t wake up, the Sharp Big Bang is the undisputed champion of loudness—nothing else in this price range comes close. Just be aware: with great volume comes the risk of waking up the whole house, so pick the right tool for your environment.

For more advice on building a foolproof morning routine or using reminders to actually get out of bed (without throwing your clock across the room), check out resources from the National Heart, Lung, and Blood Institute on healthy sleep habits—or try pairing your new clock with a reminder app for backup.

And if you’re still not sure? Don’t overthink it: pick the model that matches your top need from the decision tree above and start getting up on time—your future self will thank you.