UD5 Toolkit
Rowing Calorie & Split Calculator – Concept2 Pace to Watts
Convert between rowing pace (per 500m), watts, and calories per hour. Plan your erg workouts with precise intensity targets.
Online Stopwatch – Free Lap & Split Timer
Full‑screen precision stopwatch with lap & split recording. Works offline, no ads.
00:00:00.00
Shortcuts: Space Start/Stop · L Lap · S Split · R Reset
| # | Lap Time | Split Time | Total Time |
|---|---|---|---|
| No records yet. Press Lap or Split to start recording. | |||
Frequently Asked Questions
Lap records the time since the previous lap (or start). It is ideal for timing consecutive segments of a race, workout, or repetitive tasks.
Split records the total elapsed time from the start. It is used to mark intermediate times without resetting a new lap. You can use both modes interchangeably.
Split records the total elapsed time from the start. It is used to mark intermediate times without resetting a new lap. You can use both modes interchangeably.
Yes! Press Space to start/stop, L for next lap, S for split time, and R to reset. Shortcuts work even when buttons are focused.
The timer updates every 10 milliseconds (1/100 second) using the browser's high‑resolution time. Minor display latency depends on your device, but timing precision is suitable for sports, cooking, and professional timing.
Absolutely. The tool is fully client‑side JavaScript; no internet connection is required after the page loads. We do not display any ads or tracking scripts – it’s a free, clean tool for everyone.
To maintain logical consistency, you can only add new lap or split marks while the stopwatch is running. You can record at any time during an active timing session, then pause or reset.
Currently you can manually copy the times from the table. We plan to add a CSV export feature soon. In the meantime, simply select and copy the rows you need.
Yogurt Incubation Timer & Culture Scheduler
Set timer for incubation period with temperature guide. Track hours for optimal tanginess. Homemade yogurt.
Speech Timer – Online Practice Presentations with WPM
Paste your speech, set time limit, and practice with a pacing indicator (words per minute). Refine delivery.
Emoji Countdown Timer – Online Animated Pizza/Smiley Alarm
Set a short timer with a themed emoji animation (e.g., pizza cooking). A playful visual countdown.
Reapply Sunscreen Reminder – Online Timer for Outdoor Play
Set interval reminders to reapply sunscreen every 2 hours (or custom) with sound and notification. Protect kids' skin.
Baby Nap Timer – Online Reminder & Soothing Sounds
Set a nap timer with optional gentle white noise or lullabies (Web Audio). Reminder to put baby down. Fully local, no ads.
Swim Pace Calculator - Online 100m / 100yd Time Predictor
Calculate swim pace per 100m or 100yd based on total time and distance. Predict race times. For pool and open water swimmers.
Sunburn Risk Timer - Online UV Index to Safe Exposure
Enter skin type and UV index to estimate time to sunburn. Visual countdown reminder to reapply sunscreen or seek shade. Educational only.
Team Randomizer - Online Split People into Groups Fairly
Enter names and number of teams to generate random balanced groups. Quick way to form teams for games, projects, or icebreakers.
Breathing Exercise Timer - Online Inhale Hold Exhale Visual Guide
Animated circle guides your breathing: breathe in, hold, breathe out. Customizable ratios (e.g., 4-7-8). Soothing colors, optional bell sound. Purely local.
Posture Reminder - Online Sit Straight Alert & Timer
Set recurring audio/visual reminders to check and correct sitting posture. Adjustable interval and notification style. Helps reduce back pain from desk work.
Text to Columns - Online Split by Delimiter
Paste delimited data and split it into columns. Choose custom separator. Shows a preview table. Local.
GIF Frame Extractor - Online Split Animated GIF into PNGs
Upload an animated GIF and download every single frame as a separate PNG image. See frame delays and total count. Entirely local.
Coding Interview Timer - Online LeetCode Practice Clock
Set a 20, 30, or 45‑minute countdown to simulate a technical interview. Hidden/unhidden. Boost your prep.
Digital Hourglass - Online Visual Timer with Sand
An animated hourglass that you can set for any time. Watch the sand flow. Beautiful and calming timer.
Pomodoro Task Planner - Online Work Sessions & To‑Do List
Combine a Pomodoro timer with a built‑in to‑do list. Estimate pomodoros per task, track completed sessions, and see daily progress. All data stored locally.
Random Team Generator - Online Split Names into Groups
Paste a list of names and split them into a specified number of random teams. Perfect for sports and classrooms.
Posture Reminder Timer - Online Sit Up Straight Alert
Set a recurring timer that reminds you to check your posture. Desktop notification with a gentle chime. Stay healthy.
Meditation Bell Timer - Online Interval Singing Bowl
Set a meditation session with singing bowl sounds at start, interval chimes, and end bell. No ads, pure serenity.
Meeting Speaker Timer - Online Countdown Per Agenda Item
Set a list of agenda items with allocated minutes. Advance through speakers and see remaining time visually. Keep meetings on track.
Online Alarm Clock - Set & Wake with Sound
Set an alarm that rings at a specific time even if the tab is in background. Multiple alarm tones. Works offline.
Egg Timer - Online Soft, Medium, Hard Boiled Countdowns
Pick your egg style and get a precise timer with visual progress. Perfect boiled eggs every time. No app needed.
Tea Steeping Timer - Online Perfect Brew Countdown
Choose your tea type and start a precise steeping timer with color‑changing background. Never over‑steep again.
Work Break Reminder - Online Eye‑Care & Stretch Timer
Set a timer that reminds you to take a break, stretch, or follow the 20‑20‑20 rule. Desktop notification supported. Runs offline.
Countdown to Date - Online Custom Event Timer
Create a personal countdown to any future date (birthday, vacation, launch). Shows days, hours, minutes, seconds. Locally stored.
Stopwatch & Countdown Timer - Online Dual Tool
Dual-function tool: a precise stopwatch with laps and a configurable countdown timer with alarm sound. Works offline, perfect for activities.
Tip Pool Calculator - Online Fair Share Splitter for Staff
Fairly distribute pooled tips among staff based on hours worked or points. Customizable percentages. All calculations local and private.
PDF Page Extractor - Online Split & Extract Pages Locally
Extract specific pages or split a PDF document into multiple files. Works entirely in the browser; your documents never leave your computer.
Image Splitter - Online Cut Photo into Grid or Strips
Split an image into equal grid parts or horizontal/vertical strips. Useful for Instagram carousel posts or puzzle creation. Everything runs in your browser.
Pomodoro Timer - Online Focus & Productivity Countdown
Boost your productivity with the Pomodoro technique. Customizable work and break intervals with desktop notifications. Simple, clean, and works offline.