Tools

Calculate transfer times, storage, display dimensions and device estimates with clear units and assumptions.

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Download Time Calculator

Estimate a file's download duration from its size and transfer speed. Match the displayed units, then compare the theoretical result with a rate you expect to sustain.

Upload Time Calculator

Estimate the transfer time for a video, backup or shared file. Use the upload rate rather than the download rate, and enter the total size of the data that must leave your device.

Mbps to MB/s Converter

Convert megabits per second to megabytes per second, or reverse the calculation. Use the result to compare an internet rate with a file-transfer rate without mixing bits and bytes.

Drive Capacity Calculator and Storage Converter

Compare the GB or TB on a drive's packaging with its binary equivalent. Add your own reserved-space allowance. The result keeps the unit conversion separate from space allocated for other uses.

Storage Space Calculator

Plan collection storage from the file count and your sampled average size. Add spare capacity for growth or uncertainty. The result separates the collection from the extra allowance.

USB Transfer Time Calculator

Estimate a USB copy from its total size and sustained rate. Known port and drive limits help compare bottlenecks. Connector shape alone does not establish the connection's data rate.

Data Usage Calculator

Estimate data transferred during repeated sessions from an average bitrate and duration. Read the total in GB and GiB, then compare it with an optional data allowance.

Streaming Bitrate Calculator

Add the video and audio bitrates of one outgoing live stream, then apply an optional planning margin. The result is an upload-capacity estimate, not an automatic quality recommendation.

Video Call Bandwidth Calculator

Estimate the combined upload and download capacity for simultaneous calls sharing one connection. Enter the rate for each local endpoint and keep the two directions separate.

HDMI / DisplayPort Bandwidth Calculator

Calculate the active-video data rate from resolution, refresh rate and bits per pixel. Compare it with a useful payload budget you supply. This is a planning calculation, not a compatibility certificate.

PPI Calculator

Calculate a screen's pixels per inch from its native pixel dimensions and active diagonal. The result also shows the rectangular screen's estimated width, height and reduced aspect ratio.

Megapixel Calculator

Convert image pixel dimensions to megapixels, or estimate dimensions from a target megapixel count and aspect ratio. This counts pixels; it does not assess camera or image quality.

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.

Modem Rent or Buy Calculator

Compare equipment rental charges with a one-time purchase and setup cost over your chosen number of months. Enter your own prices; the calculation does not select a modem or recommend a purchase.

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.

SD Card Speed Class Checker

Read the minimum sequential write rating behind an SD or microSD speed-class symbol. Select the mark printed on the card, then compare the class family with the requirement in the device manual.

Windows Update Space Checker

Compare free space on the Windows system drive with the free-space target stated for a particular update. Enter figures from Windows or the relevant installation instructions; this page does not scan the drive.

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.

Input Lag Checker

Work through a guided check for delayed mouse or controller response. Your observations help separate input, game rendering and display checks; this page does not measure physical input latency.

Game Lag Checker

Separate network lag, low frame rate, uneven frame delivery and delayed input using the symptoms you observe in a game. The result suggests the next checks rather than diagnosing your PC or connection.

Gamepad Tester

Inspect the controller states exposed by this browser: connected devices, button values, axis positions and mapping. The test shows reported input without certifying the controller's hardware.

Microphone Test

Check that the selected microphone delivers a changing audio signal to this browser. Start the test, grant microphone access and watch the relative level while speaking. A moving meter is evidence of incoming audio, not a complete hardware assessment.

Webcam Test

Open a live preview from an available camera and check the stream settings reported by the browser. The preview uses the actual permitted camera stream. Start and Stop controls keep the capture session explicit.

Left and Right Speaker Test

Play a generated tone through the browser’s current audio output. Compare Left, Right and Both to check what is audible from the selected system output. This is a listening check; the page cannot hear the speakers.

Screen Colour Temperature Guide

Review screen white-point settings with a static white and gray reference. The page helps organize a comparison of display presets and software filters; it cannot measure the panel's temperature in kelvin.

Dead Pixel Test

Display solid colors to inspect your screen for persistent dark, bright or colored points. Choose each field manually and record what you see; the page does not detect or diagnose pixels automatically.

Monitor Ghosting Test

Observe moving edges for trails or halos with a browser-generated pattern. Start the animation deliberately and compare supported display settings under the same conditions. This is a visual check, not a response-time rating.

Blurry Text Checker

Compare where text looks blurred and collect the relevant display settings. Choose the operating system and the affected scope: one application, one display or everything. The guide suggests checks from your observations; it does not inspect the screen.

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.

Wi-Fi Free-Space Path Loss Calculator

Calculate the reference loss between two antennas from frequency and distance. This free-space model helps compare ideal radio paths. It does not scan Wi-Fi, measure signal power, map a room or predict indoor coverage.

Bluetooth Range and Dropout Checker

Work through a repeatable placement check for a connected Bluetooth accessory. Use distance, obstacles and observed behaviour to choose the next comparison. The page does not scan devices or calculate a maximum range.

4G and 5G Signal Reading Checker

Understand a signal value copied from your phone or modem’s own status display. Select 4G LTE or a 5G SS metric, then enter the reading manually. The browser cannot read the cellular radio or verify the source.

VPN Speed Loss and Gain Calculator

Compare two entered speed readings, one without the VPN and one with it. See the signed change, relative change and retained percentage. This page performs arithmetic; it does not run a speed test or contact the VPN.

CGNAT and Double NAT Address Checker

Compare a router’s WAN IPv4 with a public IPv4 reading from the same connection. Address ranges and a mismatch provide clues about upstream translation. They do not confirm CGNAT, count NAT layers or test open ports.

2.4 GHz Wi-Fi Channel Overlap Checker

Compare the nominal frequency spans of two manually entered 2.4 GHz channels. The result shows centre spacing and span overlap. It does not scan nearby networks, measure interference or recommend the best channel.

Internet Speed Test

Run a short download and upload test between this browser and Savvy Toolkit’s server. Start controls the test; opening the page does not begin transfers. Results describe this route and endpoint, rather than the maximum speed of an internet plan.

HTTP Latency and Jitter Test

Measure repeated HTTP round-trip times between this browser and Savvy Toolkit’s server. See mean and median response times and the mean absolute change between adjacent readings. This page uses HTTP requests, rather than ICMP ping or one-way packet timing.

VPN Connection Troubleshooter

Choose the VPN symptom observed on the device and review the next checks. This guide organises manual observations; it cannot inspect the VPN app, read a profile, test an account or scan the network. Passwords, recovery codes and configuration secrets are not needed.

CarPlay Connection Troubleshooter

Choose the connection method and the requirements already checked for this iPhone and vehicle. The guide gives manual next steps for CarPlay. It does not connect to the car, inspect the cable or confirm compatibility from a model database.

Screen Mirroring Compatibility Checker

Select the source platform, the receiver’s protocol and the symptom observed. The guide distinguishes AirPlay, Miracast and Google Cast before suggesting checks. It cannot discover displays, read device capabilities or certify a phone and TV combination.

Phone Sound Checker

Choose the phone platform, affected sound, observed output and Focus or Do Not Disturb state. The guide separates incoming-call ringing, Clock alarms and media before suggesting manual settings checks. It cannot read a silent switch, volume, audio route or alarm configuration.

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.

iPhone Message Colours Explained

Check the meaning of an observed message color and service label in Apple’s Messages app. Select outgoing blue, outgoing green, incoming gray or unknown, then the visible label and symptom. No conversation text, contact details or screenshots are needed.

App Outage Checker

Request an official status summary for GitHub, Discord or Zoom, then compare it with observations from the affected connection. The provider feed reports service status; it does not test the app, account, device or network path that failed for you.

Website Indexability Checker

Inspect public technical signals that can affect crawling and indexing. Enter one public page URL and start the check. The result reports the fetched response, not the page’s actual position in Google or Bing’s index.

IPv4 Subnet Calculator

Calculate an IPv4 block from an address and CIDR prefix. Read the subnet mask, boundary addresses and conventional host positions without scanning a network. The results describe address arithmetic, not devices currently connected or addresses available for allocation.

DNS Lookup

Query Google Public DNS for one public domain name and record type. Choose A, AAAA, CNAME, MX, NS, TXT or SOA, then start the lookup. Read the resolver response with its source and query time; this is not a worldwide propagation check.

Email Attachment Size and Base64 Calculator

Estimate attachment bytes after Base64 encoding and compare a modeled message with a known size limit. Enter file sizes or select local files for their size metadata. File contents are not read or uploaded, and no email is sent.

RAID Capacity Calculator

Calculate nominal capacity for RAID 0, 1, 5, 6 or 10 from the drive sizes entered. The model gives every member the smallest drive’s capacity. It separates unused size mismatch from capacity allocated to mirrors or parity; it does not inspect an array.

EXIF and Photo Metadata Viewer

Read selected embedded metadata from a local JPEG or TIFF file up to 20 MiB. The file is parsed in this browser without uploading it. Camera details and dates may be absent; GPS coordinates stay hidden until explicitly enabled and the file is read again.

QR Code Scanner

Read a QR code from a local image or a camera preview. Decoding runs in the browser without uploading images or frames. The result appears as plain text; links are never opened automatically.

Video File Size Calculator

Estimate video storage from average video bitrate, audio bitrate and duration. Add a separate percentage allowance and compare decimal MB/GB with binary MiB/GiB. The calculator uses entered values; it does not inspect, compress or upload a video.

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.

Microphone Gain Calculator

Calculate an ideal gain change from an existing digital sample-peak reading and a chosen target, both in dBFS. See the amplitude multiplier and target margin below full scale. Enter readings manually; this calculator does not access the microphone or adjust a device.