Technology Calculators
Estimate file-transfer time, bandwidth, data use and digital dimensions while keeping units, protocol overhead and real-world performance visible.
Network speeds are commonly advertised in bits per second while file sizes use bytes. Convert units consistently and allow for congestion, Wi-Fi conditions, protocol overhead and provider performance before treating a theoretical transfer time as a promise.
How to use these calculators well
- Distinguish bits from bytes and decimal units from binary units.
- Allow for protocol overhead, congestion and real device or Wi-Fi limits.
- Treat advertised maximum speeds as inputs, not guaranteed sustained performance.
Download Time Calculator
Work out how long a file will take to download at a given internet speed, in hours, minutes and seconds.
Open calculatorUpload Time Calculator
Calculate how long it takes to upload a file or backup given its size and your upload speed in Mbps or MB/s.
Open calculatorBandwidth Calculator
Estimate the total network bandwidth needed for a number of simultaneous users or devices on a connection.
Open calculatorInternet Data Usage Calculator
Estimate your monthly internet data usage from daily activities like streaming, video calls and browsing.
Open calculatorBackup Storage Growth Calculator
Calculate net monthly backup storage growth and linear free-capacity runway from comparable snapshots in decimal GB.
Open calculatorBackup Time Calculator
Estimate how long a backup of a given data size will take over a network, USB or cloud connection.
Open calculatorBattery Runtime Calculator
Estimate how long a battery will last from its capacity in mAh or Wh and the device's average power draw.
Open calculatorBinary, Decimal and Hex Converter
Convert a whole number between decimal, binary, hexadecimal and octal formats, useful for programming and networking tasks.
Open calculatorCloud Storage Headroom Calculator
Compare recorded cloud storage use with allocated capacity, showing utilisation and signed free storage in decimal GB.
Open calculatorComputer Electricity Cost Calculator
Estimate the running electricity cost of a computer, console or other device from its wattage, hours used and your tariff.
Open calculatorDevice Storage Headroom Calculator
Compare recorded device storage use with usable capacity, showing utilisation and signed free space in decimal GB.
Open calculatorImage Aspect Ratio Calculator
Work out a proportional height or width for an image, or simplify its aspect ratio, from two known dimensions.
Open calculatorIP Address Range Calculator
Calculate the first, last and total number of IPv4 addresses covered by a given network address and prefix length.
Open calculatorPassword Entropy Calculator
Estimate a password's strength in bits of entropy from its length and the character set used, plus a rough crack-time indicator.
Open calculatorPhoto Library Storage Calculator
Estimate photo-library storage in decimal GB from photo count and a measured average image file size in MB.
Open calculatorRAID Storage Capacity Calculator
Estimate usable storage capacity and redundancy for common RAID levels (0, 1, 5, 6, 10) from disk size and count.
Open calculatorScreen Pixels Per Inch (PPI) Calculator
Calculate a screen's pixel density (PPI) from its resolution and diagonal size in inches.
Open calculatorScreen Resolution Megapixel Calculator
Calculate the total megapixel count and aspect ratio of a screen resolution such as 1920x1080 or 3840x2160.
Open calculatorSLA Downtime Credit Calculator
Estimate the allowed downtime and potential service credit under a provider's SLA, given the uptime target and outage duration.
Open calculatorSubnet Calculator
Work out the network address, broadcast address, subnet mask and usable host range for an IPv4 address and prefix length.
Open calculatorUnix Timestamp Converter
Convert between a Unix timestamp (seconds since 1 January 1970) and a human-readable date and time in AEST/AEDT or UTC.
Open calculatorVideo Bitrate Calculator
Calculate the recommended video bitrate to hit a target file size, or the resulting size from a chosen bitrate.
Open calculatorVideo File Size Calculator
Estimate the file size of a video from its bitrate and duration, useful for storage and upload planning.
Open calculatorWebsite Page-Weight Budget Calculator
Compare measured website page weight with a team budget, showing utilisation and signed megabyte headroom.
Open calculatorWebsite Uptime Calculator
Convert a website or service's uptime percentage into the equivalent downtime in minutes per day, month and year.
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