Tech & Digital Calculators Comparison
All 72 Tech & Digital calculators in one comparison table, with the formula and a worked example for each.
What you can work out with these calculators
Tech and digital calculators deal with computing numbers that are easy to get wrong: download and transfer time, data usage, storage units, password strength and hosting economics. They are explicit about the unit conventions involved, because base-2 versus base-10 and bits versus bytes cause most of the confusion.
- Estimate how long a download or transfer will take at a stated connection speed.
- Convert between storage units and see the difference between decimal and binary prefixes.
- Project data usage across a month from per-day activity.
- Check whether hosting or infrastructure costs are covered by expected traffic and revenue.
Compare calculators by what you enter
All 72 calculators here, one row each: what each tool works out and the fields it asks for before it does. Open any row to use the calculator itself.
| Calculator | What it works out | What you enter |
|---|---|---|
| Internet Download Time | Calculate file download time | File Size (GB) · Speed (Mbps) |
| Bandwidth Calculator | Calculate bandwidth needed for activities | Devices · Activity |
| Data Usage Calculator | Calculate monthly data usage | Streaming (hrs/day) · Browsing (hrs/day) · Gaming (hrs/day) |
| Video File Size | Calculate video file sizes | Duration (min) · Bitrate (Mbps) · Resolution |
| Monitor Viewing Distance | Find ideal screen distance | Screen Size (in) · Resolution |
| WiFi Channel Finder | Find best WiFi channel | Band · Nearby Networks |
| Cloud Storage Cost | Compare cloud storage plans | Storage Needed (GB) |
| Website Dev Cost | Estimate website development cost | Project Type |
| SSD vs HDD Speed | Compare SSD vs HDD speeds | File Size (GB) |
| Battery Life Estimator | Estimate device battery life | Battery (mAh) · Usage (watts) · Battery Voltage (V) |
| Screen Resolution Guide | Find ideal resolution for screen size | Screen Size (in) · Viewing Distance (ft) |
| Cable Length Calculator | Calculate optimal cable length | Distance (m) · Cable Type |
| PPI (Pixels Per Inch) | Calculate screen pixel density | Width (pixels) · Height (pixels) · Diagonal (in) |
| Power Supply Calculator | Calculate PSU wattage needed | CPU TDP (watts) · GPU TDP (watts) · RAM Sticks · Drives |
| Print Resolution Guide | Calculate optimal print resolution | Width (pixels) · Height (pixels) · DPI |
| Password Crack Time | Estimate how long it takes to brute-force a password | Password Length · Character Set · Guesses per Second (M) |
| Image File Size Estimator | Estimate image file size from dimensions | Width (px) · Height (px) · Format |
| Hosting Cost per Year | Compare hosting plans over a year | Monthly Price ($) · Setup Fee ($) · Renewal Rate ($/mo) · Years |
| Refresh Rate vs FPS | Find max FPS your monitor can show | Monitor Refresh (Hz) · Game FPS |
| Streaming Bitrate Guide | Find ideal streaming bitrate for your setup | Resolution · Frame Rate |
| RAID Capacity Calculator | Calculate usable storage for RAID levels | Drive Count · Drive Size (TB) · RAID Level |
| Uptime / Downtime Calculator | Convert uptime % to downtime per year | Uptime (%) |
| Device Charging Time | Estimate how long your device takes to charge | Battery (mAh) · Charger Output (A) · Efficiency (%) |
| Cloud Data Transfer Cost | Estimate cloud egress bandwidth cost | Data Transferred (GB/mo) · Provider |
| AI Token Cost Estimator | Estimate LLM API costs for your usage | Input Tokens (K/mo) · Output Tokens (K/mo) · Model |
| Base64 Encoder | Encode text to Base64 instantly | Text to Encode |
| Base64 Decoder | Decode Base64 back to readable text | Base64 Text |
| URL Encoder / Decoder | Encode or decode URL parameters safely | Text · Mode |
| JSON Formatter | Pretty-print, minify and validate JSON | JSON · Indent |
| Word & Character Counter | Count words, characters, sentences and reading time | Text |
| Text Case Converter | Convert text between uppercase, lowercase, title and sentence case | Text · Convert To |
| Hash Generator (MD5/SHA) | Generate MD5, SHA-1, SHA-256 and SHA-512 hashes | Text · Algorithm |
| RGB ↔ Hex Converter | Convert between RGB and HEX color codes | Convert · Red (0-255) · Green (0-255) · Blue (0-255) · HEX (#RRGGBB) |
| UUID v4 Generator | Generate one or many random UUID v4 identifiers | How Many |
| Strong Password Generator | Generate secure random passwords with adjustable length and character sets | Length · A-Z · a-z · 0-9 · !@# |
| IP Subnet Calculator | Calculate network address, broadcast, range and usable hosts for IPv4 CIDR | IP Address · Prefix Length (/24) |
| Cron Expression Validator | Validate and explain cron schedule expressions | Cron Expression · Detail |
| Resistor Color Code Calculator | Decode 4-band resistor colors to ohms and tolerance instantly | 1st Band · 2nd Band · Multiplier · Tolerance |
| ASCII Table Reference | Look up ASCII character codes (0-127) — decimal, hex, binary | Character · Show Range |
| Wire Gauge (AWG) Reference | Look up AWG wire diameter, area and ampacity (RapidTables-style reference) | AWG Size |
| Aspect Ratio Calculator | Find dimensions for an aspect ratio | Ratio Width (e.g. 16) · Ratio Height (e.g. 9) · Known Width (px) |
| Color Contrast Checker | WCAG contrast ratio between two colors | Foreground (hex) · Background (hex) |
| Reading Time (Web) | Reading time for a webpage or article | Word Count · Words per Minute |
| PX to REM/EM Converter | Convert px to rem and em | Pixels (px) · Root Font Size (px) |
| Storage Needs Calculator | Storage space for your files | Photos (millions) · Video Hours (1080p) · Documents (GB) · Music Hours |
| Latency-Bandwidth Calculator | Transfer time from bandwidth and latency | File Size (MB) · Bandwidth (Mbps) · RTT Latency (ms) |
| Download Time Calculator | Time to download a file | File Size · Size Unit · Download Speed (Mbps) |
| Audio File Size Calculator | File size of an audio recording | Duration (min) · Bitrate (kbps) |
| Backup Size Calculator | Backup storage over retention | Full Backup (GB) · Daily Change (GB) · Retention (days) |
| TV Screen Size Calculator | Recommended TV size by distance | Viewing Distance (ft) · Resolution |
| Streaming Data Calculator | Data used by streaming quality | Hours per Day · Quality · Days per Month |
| Code Line Estimator | Lines of code for a project | Features/Screens · Complexity · Developers · Working Days Available |
| dBm ↔ Watts Converter | Convert between dBm and watts for RF power | Convert · Value |
| API Cost Calculator | Monthly API usage cost estimate | Requests per Month · Price per 1000 Requests ($) · Compute Hours per Month · Compute Rate ($/hr) |
| Keyword Density Calculator | How often a keyword appears in your text | Text · Keyword |
| Readability Score Calculator | Flesch Reading Ease and grade level | Total Words · Total Sentences · Total Syllables |
| Typing Speed Calculator | Gross and net WPM from characters and errors | Characters Typed · Minutes · Errors |
| Ad Revenue Calculator | CPM/CPC ad earnings estimate | Monthly Impressions · CPM ($ per 1000) · Click-Through Rate (%) · CPC ($ per click) |
| Click-Through Rate Calculator | CTR from clicks and impressions | Clicks · Impressions |
| Subnet Calculator (CIDR) | Network, broadcast, mask and host count from CIDR | IPv4 Address · Prefix (/bits) |
| Video File Size Calculator | Storage needed from bitrate and duration | Video Bitrate (Mbps) · Duration (minutes) · Audio Bitrate (kbps) |
| CIDR to Subnet Calculator | Mask, host count, and broadcast details for a CIDR block | CIDR Prefix (0-32) · Network Octet Check (e.g. 10.0.1.x -> enter 1) |
| GPU Value Comparison | Frames per second per dollar and per watt | Benchmark FPS · Card Price ($) · Board Power (W) |
| Data Center PUE Calculator | Power usage effectiveness from facility and IT load | Total Facility Power (kW) · IT Equipment Power (kW) |
| Screen PPI Calculator | Pixels per inch from resolution and diagonal | Width (px) · Height (px) · Diagonal (inches) |
| Mining Yield Calculator | Expected coin yield from network share of hashrate | Your Hashrate (TH/s) · Network Hashrate (EH/s) · Block Reward (coins) · Coin Price ($) |
| RAID Usable Capacity Calculator | Usable and fault-tolerant capacity for common RAID levels | Number of Disks · Disk Size (TB) · RAID level (0, 1, 5, 6, 10) |
| Container Density Calculator | How many containers fit given RAM and CPU budgets | Host RAM (GB) · Host vCPUs · RAM per Container (GB) · vCPU per Container · Reserve for OS (%) |
| Load Test VU Calculator | Virtual users needed to hit a target request rate | Target Requests/sec · Avg Response Time (s) · Think Time (s) |
| Wi-Fi Real Throughput Calculator | Expected usable throughput from link speed and efficiency | Link Speed (Mb/s) · Efficiency Factor (0–1) |
| Data Usage Estimator | Monthly mobile data from daily streaming hours | Streaming Hours per Day · Data per Hour (GB) · Days per Month |
| Uncompressed Image Size Calculator | Raw bitmap size from pixel dimensions and channels | Width (px) · Height (px) · Bytes per Pixel (3 = RGB 8-bit) |
Prefer the annotated list? Browse the full list with one line on what each calculator does.
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