Hong Life CalculatorsAll tech & IT tools
Networking
- IPv4 Subnet Calculator (CIDR, mask, hosts, range)
- CIDR ⇄ Subnet Mask ⇄ Host Count Converter
- VLSM Subnet Planner
- IP Address ⇄ Integer ⇄ Hex ⇄ Binary Converter
- IPv6 Address Expander & Compressor
- Bandwidth-Delay Product & TCP Window Calculator
- Download / Transfer Time Calculator
- Data Rate Converter (bps, Mbps, MB/s, Gbps)
- MTU, MSS & Tunnel Overhead Calculator
- Network Latency Calculator (propagation, transmission)
- M/M/1 Queue Calculator (utilisation, wait time)
- TCP Throughput with Packet Loss (Mathis) Calculator
- VoIP Bandwidth per Call Calculator
- Wi-Fi Signal (dBm) & SNR Quality Calculator
- Fresnel Zone & Line-of-Sight Calculator
- Fibre Optic Link Loss Budget Calculator
- RAID Capacity & Fault Tolerance Calculator
- RAID Rebuild Time Estimator
- Backup Window & Bandwidth Calculator
- CDN Cache Hit Ratio & Origin Offload Calculator
- Uptime / SLA Downtime Calculator (nines)
- Little’s Law & Throughput Calculator (TPS, concurrency)
- Server Capacity Planning Calculator
- DHCP Lease Timers (T1/T2) Calculator
- Ethernet Throughput & Frame Rate Calculator
- NAT Port Capacity Calculator
- Website Bandwidth Calculator (monthly data transfer & Mbps from page views)
- Mobile Data Usage Calculator (GB per month for video, music, calls & web)
- Baud Rate Calculator (bit rate, UART characters per second & transfer time)
Encoding & bits
- Base64 Encoder & Decoder (UTF-8)
- URL Encoder & Decoder (percent-encoding)
- Text ⇄ Binary ⇄ Hex ⇄ Decimal Bytes (UTF-8)
- Unicode Code Point & UTF-8/UTF-16 Inspector
- String Length & Byte Size Calculator
- ASCII Code Lookup
- Bitwise Calculator (AND, OR, XOR, NOT, shifts)
- Bit Count (popcount), Leading & Trailing Zeros
- Gray Code ⇄ Binary Converter
- BCD (Binary-Coded Decimal) Converter
- Checksum Calculator (CRC-32, Adler-32, byte sum)
- Luhn Check Digit Calculator (validation)
- ISBN-10 / ISBN-13 Check Digit & Converter
- FP16 / bfloat16 / FP32 Precision Converter
- Integer Type Range Calculator (int8 … int64)
- Unix Timestamp Converter (and Year 2038)
- Byte Unit Converter (KB vs KiB, MB vs MiB)
- Uncompressed Image & Video Size Calculator
- Video File Size from Bitrate Calculator
- Shannon Entropy Calculator (text)
- Huffman Code Generator
- Run-Length Encoding (RLE) Tool
- Struct Alignment & Padding Calculator (C)
- Virtual Address → Page Number & Offset Calculator
- Letters to Numbers Converter (A=1, B=2 … Z=26 cipher)
- Numbers to Letters Converter (1=A, 2=B … 26=Z decoder)
- Morse Code Translator (text to Morse and Morse to text, ITU)
- Chmod Calculator (Unix file permissions: octal ⇄ rwx)
- Binary Addition Calculator (with carries and overflow check)
- Binary Calculator (add, subtract, multiply, divide, AND, OR, XOR)
- LFSR Calculator (linear-feedback shift register sequence & period)
- Hamming Code Calculator (encode data bits, find & correct a 1-bit error)
- Parity Bit Calculator (even & odd parity, add or check)
Security & crypto
- SHA-256 Hash Generator (text)
- HMAC-SHA256 Generator
- Password Strength & Entropy Calculator
- Diceware Passphrase Entropy Calculator
- Random Password Generator (crypto-secure)
- Hash Collision Probability Calculator (birthday bound)
- Password Hash Cost Calculator (bcrypt, PBKDF2)
- Caesar & ROT13 Cipher Tool
- Vigenère Cipher Tool
- RSA Key Math Calculator (educational, small primes)
- Diffie-Hellman Key Exchange Calculator (educational)
- JWT Decoder (header & payload, no verification)
- TOTP Time Step & Window Calculator
- CVSS v3.1 Base Score Calculator
- Risk: SLE & Annual Loss Expectancy Calculator
- RPO / RTO & Backup Frequency Checker
- Proof-of-Work Difficulty & Expected Time Calculator
- Ethereum Gas Fee Calculator (EIP-1559)
- Merkle Tree Size & Proof Length Calculator
- Secret Sharing Threshold Planner (Shamir k-of-n)
- Detection Alerts: Precision, Recall & Base-Rate Calculator
- Certificate Expiry & Renewal Date Calculator
Algorithms & performance
- Big-O Growth Calculator (operations for n)
- Master Theorem Solver (T(n) = aT(n/b) + f(n))
- Binary Search & Comparison Count Calculator
- Hash Table Load Factor & Probe Calculator
- Bloom Filter Size & False Positive Calculator
- HyperLogLog Error & Memory Calculator
- Tree Height Calculator (BST, AVL, red-black, B-tree)
- Binary Heap Index Calculator
- Graph Memory Calculator (adjacency matrix vs list)
- Graph Algorithm Running Time Estimator
- Levenshtein Edit Distance Calculator
- Longest Common Subsequence Calculator
- 0/1 Knapsack Solver
- Tower of Hanoi Moves Calculator
- Core Web Vitals Score Checker (LCP, INP, CLS)
- Page Weight & Load Time Calculator
- Gzip / Brotli / WebP / AVIF Savings Calculator
- Frame Budget Calculator (60/90/120 fps)
- Latency Percentiles Calculator (p50, p95, p99)
- Amdahl’s & Gustafson’s Law Speedup Calculator
- Cache Average Memory Access Time Calculator
- IOPS ⇄ MB/s Calculator
- HDD Random Access Time & IOPS Calculator
- SSD Endurance (TBW, DWPD) & Lifetime Calculator
- Cloud Storage Cost Calculator
- Database Table Size Estimator
- API Rate Limit & Token Bucket Calculator
- Sprint Velocity & Release Forecast Calculator
- COCOMO Effort Estimator (basic)
- LLM Token & Context Size Estimator
- Cyclomatic Complexity Calculator (McCabe M = E − N + 2P)
Machine learning & data
- Confusion Matrix Metrics Calculator (precision, recall, F1, MCC)
- F-beta Score Calculator
- ROC AUC Calculator (from scores & labels)
- Log Loss (Cross-Entropy) Calculator
- Regression Error Metrics (MAE, RMSE, MAPE, R²)
- KL & Jensen-Shannon Divergence Calculator
- Cosine Similarity & Euclidean Distance Calculator
- Softmax & Sigmoid Calculator
- Neural Network Parameter & Memory Calculator
- LLM Inference Memory Calculator (weights + KV cache)
- Model Training Compute (FLOPs) & Time Estimator
- Learning Rate Schedule Calculator (warmup + cosine)
- Train / Validation / Test Split Calculator
- Variance Inflation Factor (VIF) Calculator
- Durbin-Watson Statistic Calculator
- Autocorrelation (ACF) Calculator
- Exponential Smoothing Forecast (SES & Holt)
- A/B Test Significance & Lift Calculator
- Silhouette Score Calculator (one point)
- AI Water Footprint Calculator (water per chatbot request, order of magnitude)
- Cryptocurrency Footprint Calculator (Bitcoin electricity & CO₂ per transaction, averaged)
Text tools
- Uppercase & Lowercase Converter (lowercase to UPPERCASE and back)
- Capital Case Converter (Capitalize Every Word)
- Sentence Case Converter (capitalize the first word of each sentence)
- Title Case Converter (APA style headline capitalization)
- Bold Text Generator (Unicode bold letters for social media bios & posts)
- Italic Text Generator (Unicode slanted letters to copy and paste)
- Cursive Font Generator (Unicode script letters to copy and paste)
- Upside-Down Text Generator (flip text 180° with Unicode look-alike letters)
- Mirror Text Generator (reverse each line and flip letters left to right)
- Reverse Text Generator (backwards text, word order or each word)
- Underline Text Generator (Unicode underlined letters to copy and paste)
- Strikethrough Text Generator (Unicode crossed-out text to copy and paste)
- Glitch Text Generator (Zalgo text with stacked Unicode marks)
- Gothic Font Generator (Fraktur blackletter Unicode text to copy and paste)
- Small Caps Generator (ꜱᴍᴀʟʟ ᴄᴀᴘɪᴛᴀʟꜱ in Unicode to copy and paste)
- Small Text Generator (tiny Unicode letters: superscript, subscript & small caps)
- Superscript Generator (x², 10⁻³, m³ and tiny raised letters)
- Subscript Generator (H₂O, CO₂, x₁ — Unicode subscript numbers & letters)
- T9 to Text Converter (phone keypad multi-tap ⇄ text, 2 = ABC … 9 = WXYZ)
- Wingdings Translator (keyboard text ⇄ Wingdings symbols as Unicode)
Web & design
- PX to EM Converter (px, em, rem, pt & % for CSS)
- Contrast Ratio Calculator (WCAG 2.2 colour contrast checker, AA & AAA)
- Color Converter (HEX, RGB, HSL, HSV, CMYK & contrast)
- HEX to RGB Converter (and RGB to HEX)
Devices & media
- Audio File Size Calculator (WAV, MP3, AAC: bitrate × length)
- Time-Lapse Calculator (interval, number of photos & clip length)
- 3D Printing Cost Calculator (filament, electricity, wear & failures)
- Drone Flight Time Calculator (hover time from weight, props & battery)
- Battery Charge Time Calculator (phone, power bank & laptop)
- Cell Phone Plan Calculator (compare total cost of two plans with the phone)
- Headphone Power Calculator (mW & volts needed from sensitivity and impedance)
- 3D Render Time Calculator (animation frames, render farm & finish time)
- Blink-Free Group Photo Calculator (how many shots so nobody blinks)
- Frames to Timecode Converter (SMPTE HH:MM:SS:FF, drop-frame 29.97)
- Resolution Scale Calculator (render resolution from scale % or upscaler mode)
- Video Frame Size Calculator (uncompressed MB per frame & data rate)
- Drone Motor Calculator (thrust per motor, power & current from thrust-to-weight)
- GSD Calculator – Ground Sample Distance (cm/pixel for drone mapping)
- RAM Latency Calculator (CAS latency in nanoseconds for DDR4 & DDR5)
FAQ
Is my data sent anywhere?
No. Every tool runs entirely in your browser; nothing you type (including passwords or text to hash) leaves your device.
Checked 8 Nov 2026.