PC & Devices
Battery Runtime Calculator
Estimate operating time from battery energy in Wh, average device load in W and a chosen usable-capacity percentage. These entered values define a model. The page does not measure the battery or the device's power consumption.
Battery Charging Time Calculator
Model the energy and time between two battery charge levels. Enter capacity in Wh and the effective average power stored in the battery over that interval. The result is a calculation from your assumptions, not a full-charge prediction.
Phone Battery Health Calculator
Compare a reported full-charge capacity with its design capacity using manually entered values. This page cannot scan a phone or read its battery health. The device's official battery information remains the source for the numbers and their meaning.
Warranty Expiry Date Calculator
Add a whole number of calendar months to a start date and compare the resulting anniversary with a chosen date. This provides a calendar reference, not confirmation of warranty coverage.
Printer Cost per Page Calculator
Estimate ink or toner cost per printed page from a replacement cost and matching declared yield. Add paper cost per page to see the consumables total and the cost of 100 pages.
IP Rating Checker
Decode the solid-object and water-protection positions in an IP code such as IP68 or IPX4. The result explains the declared rating’s test category; it does not inspect the device or authorize exposure to water.
Keyboard Tester
See the keyboard events received by this browser. The event log shows the reported key, physical code, location and repeat flag, with separate held and released states.
Mouse Tester
Check the button, movement and wheel events received inside a dedicated test area. The display separates button presses from releases and includes a readable event log.
Mouse Double-Click Tester
Observe the interval between consecutive recorded presses of the same mouse button. Choose your own timing window to highlight pairs, then compare the event log with your intended actions.
PC Upgrade Checker
Identify the evidence needed before choosing a PC upgrade. Select the slow task and describe what happens during it. The result gives a workload-specific observation plan rather than a ranked shopping list or an invented bottleneck percentage.
Keyboard Layout Checker
Compare a key’s printed label with its output in a local text field or the keyboard tester. Select whether it matches, differs or produces nothing, plus the affected applications and operating system. The guide gives input-setting checks; it does not identify a layout family.
Router Status Light Checker
Look up a documented light pattern for Google Nest Wifi Pro or TP-Link Deco X20. Select the exact model before the pattern. This is a curated reference, not a camera scan, hardware test or universal decoder for every router.
Printer Test Page
Prepare a browser-printable sheet with black text, line patterns and a 100 mm reference line. Select color blocks or a grayscale ramp separately. The page helps compare visible output; it does not read printer status, ink levels or individual nozzles.
USB Cable Checker
Check a USB cable problem with documented capabilities and a controlled cable swap. Get the next check for power, data or video.
Docking Station Compatibility Checker
Compare documented host and dock requirements for video and charging. Keep confirmed matches, shortfalls and missing information separate.
Computer Memory Calculator
Build a manual RAM budget from your baseline and concurrent applications, then compare a chosen reserve with installed memory.
Server Power Consumption Calculator
Calculate server wall power, energy use and running cost from measured wall watts or documented DC load and PSU efficiency.
PSU Calculator
Add verified CPU, GPU and other peak watts, then apply an explicit margin to calculate a component-side PSU capacity target.
CPU Wattage Calculator
Calculate DC watts from voltage and current readings at the same CPU power boundary, then estimate energy for a stated duration.
LiPo Charge Rate Calculator
Convert a documented LiPo charge C-rate and capacity into amps, with nominal power and an ideal time reference.
RAM Latency Calculator
Compare two DDR memory specifications using CAS delay in nanoseconds, memory clock and the signed difference.
UPS Runtime Calculator
Estimate backup time from entered battery energy, available capacity, inverter efficiency and connected load in watts.
Guides
Read Battery Energy, Runtime and Charging Estimates
Choose compatible capacity and power inputs, separate three battery questions and keep a clear record of the assumptions behind each estimate.
Compare Printer Costs Using Declared Yield and Actual Use
Build a compatible price-and-yield record, allocate paper by printed sides and separate a reference cost from observed printing and output quality.
Separate Input Delay, Frame Stutter and Network Lag
Trace the observed symptom through input, rendering, display and network stages. Use comparable tests and keep browser observations separate from physical latency measurements.
Choose a Dock and USB-C Cable for Your Laptop and Monitors
Match the screens, charging and peripherals you need to the documented capabilities of your laptop, dock and cables. Keep unknown specifications visible before buying.
GB vs GiB and Mbps vs MB/s: Data Units Explained
A capacity and a transfer speed answer different questions. Read the unit before comparing values: GB describes an amount of data, while Mbps describes how quickly bits can move.