Measurement
21 toolsInternational Shipping Time Estimator
Estimate cross-border shipping times across express, air, sea, rail and line shipping on major routes between 8 origin and 12 destination countries, with peak-season delays and latest arrival dates by business day.
Online Stopwatch
An online stopwatch accurate to the millisecond, with start, pause and resume, lap recording and reset. Each lap shows both the elapsed total and the gap since the previous lap.
Product Carbon Footprint Calculator
Enter product type, material, packaging, manufacturing energy use and transport mode to quickly estimate a per-unit carbon footprint using a simplified EEIO plus material-factor model — not a formal LCA report.
JavaScript Benchmark Builder
Compare the performance of two JavaScript snippets online. Paste code A and code B, run each of them repeatedly for a chosen duration, and see the operations per second (ops/s) plus which version is faster and by how much.
Device and Browser Information Viewer
See detailed information about your current device and browser online. The page detects your browser and operating system and shows screen resolution, color depth, device pixel ratio, viewport size, touch points, CPU core count and more.
Webcam Video Recorder
Record video from your webcam directly in the browser. The tool captures camera and microphone with a live preview, records with one click and lets you download the finished video file, with all processing done locally.
Keyboard Key Code Finder
Find the JavaScript key codes of any keyboard key online. Click the capture area and press a key to instantly see its key value, code value, numeric keyCode and the state of the Ctrl, Shift, Alt and Meta modifiers.
Angle Unit Converter
Convert between angle units online. Enter a value in degrees, radians, gradians, arcminutes, arcseconds, quadrants or compass points and the tool instantly lists the equivalent value in every other unit.
Area Unit Converter
Convert between 13 area units online, from square millimeters up to square kilometers, including ares, hectares, acres and the Chinese mu. Enter one value and every other unit is calculated in real time.
Conference Call Time Converter
Pick a base city and meeting time, instantly see local times across 23 major cities such as Beijing, New York, London and Tokyo, and find common working hours.
Desk Ergonomics Calculator
Enter your height and working posture to get ergonomic recommendations for seat, desk, monitor and armrest positions, with healthy office tips.
Multi-Timezone Office Status Board
See local time and work status for offices across China, Japan, the US, UK and more at a glance. Working, almost-off, off-work, weekend and late-night states are detected automatically with countdowns and overlapping online offices, plus custom-time lookup.
Typing Speed Calculator
Measure your typing speed online: paste finished text with a known duration, or run a real timed test against built-in reference passages. Get WPM and CPM with a skill level rating, plus typical WPM ranges by profession.
Screen Recording File Size Estimator
Estimate screen recording file size before you record: choose resolution, frame rate, duration, content type and codec to see compressed size, raw size, a codec comparison (H.264/H.265/AV1) and storage advice.
Online Countdown Timer
A simple countdown timer with hour, minute and second inputs, start, pause and reset controls, quick presets and an alarm when time is up.
Server Rack Unit (U) Calculator
Add devices with name, U height, quantity, and power draw to automatically calculate the number of racks needed, the multi-rack allocation plan, total power draw, and estimated heat output — supports 42U/45U/47U/48U rack sizes.
Temperature Converter
Convert between Celsius, Fahrenheit, and Kelvin in real time. Type in any one field and the other two update instantly, with the conversion formulas shown.
Length Converter
Convert between metric, imperial, and nautical length units in real time. Enter a value in any field and every other unit updates at once, with precision chosen to suit the magnitude.
Mass Converter
Convert between metric and imperial mass units in real time, from kilograms, grams, and milligrams to pounds, ounces, metric tons, and short tons. All units update at once.
Speed Converter
Convert between km/h, mph, m/s, knots, and Mach in real time. Enter a value in any field and every other unit updates instantly.
Volume Converter
Convert between metric and US customary volume units in real time, from liters, milliliters, and cubic meters to gallons, fluid ounces, pints, and quarts.