1. Pick a target
Choose 30 seconds, 1, 2, or 5 minutes — or free hold. Beginners: 20–30 seconds with perfect form beats a long, sagging plank.
Free online tool
Online plank timer.
Pick a target, tap start, and hold your plank. The timer tracks your hold time and your best of the session — right in the browser, no app needed. When you're ready for auto-progressing plans, streak calendars, and leaderboards, Plank King continues the habit on iPhone.
How to use it
How to use the plank timer.
Three steps, no setup. Works on phone, tablet, and desktop.
2. Start, then get into position
Tap Start, set your forearms down, and form a straight line from head to heels. Glance at the screen to check the bar.
3. Hold until the bar fills
The display turns green when you reach your target. Pause to log the hold, or keep going and set a session best.
Reference
The numbers behind the tool.
Formulas, reference tables, and practical guidance you can come back to.
Perfect plank form: a quick checklist
A plank only counts if the position is right, so run through this checklist at the start of every hold instead of rushing toward longer times: forearms flat on the floor, elbows directly under your shoulders; legs extended, weight on your toes; one straight line from the back of your head to your heels. If a point is out of reach today, shorten the hold rather than compromise the position.
Squeeze your glutes and brace your abs as if expecting a light punch — that tension is what protects your lower back. Keep your neck neutral, gaze on the floor just ahead of your fists, and breathe steadily; if you cannot breathe normally, the hold is long enough for today. End the set the moment your form breaks: ten seconds with a straight body trains your core more than a sagging minute.
Typical plank times by level
How long should a plank last? These ranges reflect what coaches commonly see in healthy adults, and they apply to the standard forearm plank. Treat them as reference points, not a pass-or-fail test — your own trend over several weeks matters more than any single number. Variations like the side plank typically run shorter, so don't compare them directly.
Whatever your level, add only 5–10 seconds per week. Slow progression keeps the load on your core instead of shifting it to your lower back.
| Level | Single hold | Weekly goal |
|---|---|---|
| Beginner | 20–30 s | 3–5 sets, 2–3 days |
| Intermediate | 45–90 s | 3–4 sets, 3–4 days |
| Advanced | 2–5 min | 2–3 sets, 2–3 days |
Common mistakes and how to fix them
Sagging hips: the most common fault, usually a sign the hold has run too long — shorten the set, squeeze your glutes, and imagine pulling your elbows toward your toes. Piked hips: the opposite cheat, which unloads the abs — lower your hips until shoulders, hips, and ankles line up, checking in a mirror or with your phone camera.
Holding your breath: it raises blood pressure and shortens every hold, so count your breaths aloud to keep air moving. Looking up: craning your neck breaks the straight line — keep your gaze on the floor. When in doubt, drop to your knees: a knee plank with clean alignment beats a full plank with bad form.
FAQ
Frequently asked questions.
Quick answers about this tool and how to train with it.
How long should I hold a plank?
20–30 seconds with strict form is a solid start for beginners. Build toward 60 seconds, then 2 minutes. Quality matters more than duration — a straight body for 30 seconds works your core harder than a sagging 2-minute hold.
Is this plank timer free?
Yes — completely free, no signup, no install. It runs in your browser on any device.
Can I do a 30-day plank challenge with this?
You can time every session here, but the browser won't remember your history. For a 30-day challenge you'll want streak tracking and auto-progressing targets — that's what the Plank King app does, with a calendar view and Game Center leaderboards.
What's the proper plank form?
Forearms on the floor, elbows under shoulders, body in a straight line from head to heels. Squeeze your glutes, brace your abs, and don't let your hips sag or pike. Breathe normally — don't hold your breath.
Keep going
Related tools & further reading.
More free tools that pair well with this one, plus guides and articles to go deeper.
For site owners
Embed this tool on your website.
One copy-paste gives your readers the full interactive widget — free.
<iframe src="https://www.bigbeefit.com/embed/plank-timer" width="100%" height="560"
style="border:0;border-radius:12px" title="Free Online Plank Timer – 30s to 5 Minute Targets"
loading="lazy"></iframe>
<p>Free <a href="https://www.bigbeefit.com/tools/plank-timer">Free Online Plank Timer – 30s to 5 Minute Targets</a> by BigBeeFit</p>Free for any website — blogs, gyms, coaching sites. Please keep the attribution link so your readers can find the full tool.
Want plans, streaks, and leaderboards?
Plank King saves every hold, raises your target automatically, and ranks you on Game Center — free on the App Store.