プログラミングと技術の計算機
基数変換、ビット演算、ハッシュ、エンコード、色、コントラスト、サブネット、CIDR、UUID、RAID、cron、JSONのツールです。
計算機 17 個 · 検証済みの例 125 件
数とビット
- Binary, hex and decimal converter
Convert numbers between binary, decimal, hex, octal and any base 2–36, including fractions, repeating digits and two's-complement bits for negatives.
- Bitwise calculator (AND, OR, XOR, NOT and shifts)
Bitwise AND, OR, XOR, NOT, NAND, NOR, shifts and rotates on 8- to 64-bit integers, shown in decimal, hex and binary with a bit-by-bit grid.
- Big-O time complexity calculator
Operation counts and running times for O(1), O(log n), O(n), O(n log n), O(n²), O(n³), O(2ⁿ) and O(n!) at your input size, on a log-scale chart.
テキストとデータ
- JSON formatter and validator
Format (pretty-print) or minify JSON and validate it against RFC 8259, with the line and column of any syntax error explained in plain words.
- Base64, URL and HTML encoder and decoder
Encode or decode Base64, URL-safe Base64, URL percent-encoding, HTML entities, hex bytes and Unicode code points, with UTF-8 and UTF-16 byte counts.
- Hash generator and checksum calculator (MD5, SHA-256)
Generate MD5, SHA-1, SHA-256, SHA-512 and CRC-32 hashes of any text, check them against a published checksum, and see the avalanche effect.
- UUID generator and decoder (v4, v7)
Generate reproducible UUID v4 and v7 values from a seed, or validate any UUID or GUID and decode its version, variant and embedded timestamp.
色
- Color code converter (HEX, RGB, HSL, CMYK, OKLCH)
Convert a color from HEX to RGB, HSL, HSV, CMYK, CIE Lab and OKLCH or back, and find its nearest CSS named color and relative luminance.
- Color contrast checker (WCAG 2.2)
Check the WCAG 2.2 contrast ratio between a text color and its background, with AA and AAA pass or fail for normal text, large text and UI parts.
- Color blindness simulator
How a color looks with protanopia, deuteranopia or tritanopia (red, green or blue color blindness), using the Machado et al. (2009) model.
- Color palette generator (complementary, triadic, analogous)
Generate complementary, analogous, triadic, split-complementary, tetradic or monochromatic color palettes from one base color, with HEX codes.
表示とメディア
ネットワークとストレージ
- Subnet calculator (IPv4 and IPv6 CIDR)
Find the network address, broadcast, usable host range and host count of any IPv4 or IPv6 CIDR block, with netmask, wildcard and equal subnets.
- Bandwidth and download time calculator
Download or upload time for a file at a given speed, the data a link moves in a set time, and a website's monthly bandwidth from page views.
- RAID calculator (RAID 0, 1, 5, 6 and 10)
Calculate usable RAID capacity, parity or mirror overhead and how many drive failures RAID 0, 1, 5, 6 and 10 survive, in TB and the TiB Windows shows.
セキュリティ
スケジュール
計算機の選び方：プログラミング
Select the representation, not just the number
A binary or hexadecimal string needs a base, and bitwise operations also need a width and signedness. A subnet calculation depends on the prefix length, not just an address. Color values use different coordinate systems, so identify whether the input is HEX, RGB or another format. JSON formatting can improve readability without changing the underlying data. Use a small known example before processing a long value to confirm the chosen mode.
Validate in the intended environment
An encoding is not encryption, and a hash is not a way to recover the original input. Avoid entering secrets into shared URLs or public reports. Contrast calculations evaluate the selected colors; real interfaces also depend on text size, transparency, focus states and background context. Network and storage estimates rely on their stated conventions. Check results against the protocol or application that will consume them, including its permitted ranges and formatting rules.