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See how your savings grow with compound interest and regular contributions.

Estimate your monthly mortgage payment and total interest over the loan term.

Calculate the monthly payment, total interest, and total cost of any fixed-rate loan.

グループの共同支出を分担し、最小の送金で誰が誰にいくら払うかを算出します。

チップを計算し、人数で割り勘します。

割引後の価格と節約額を計算します。消費税の追加も可能。

Calculate total return and annualized return (CAGR) between a starting and ending value.

Find a percentage of a number and the percentage change between two values.

1 から 3999 まで、数字とローマ数字を相互に変換します。

Convert between metric and imperial length units.

Convert between kilograms, pounds, ounces, grams and more.

Convert between Celsius, Fahrenheit and Kelvin.

Convert between bytes, KB, MB, GB, TB and binary units.

Convert between liters, milliliters, gallons, cups and more.

Convert between km/h, mph, m/s, knots and more.

Convert between square meters, acres, hectares and more.

Beautify, minify, and validate JSON with clear error messages.

Encode text to Base64 or decode Base64 back to text, with URL-safe support.

任意のベースカラーから濃淡と配色ハーモニーを生成します。

Generate strong, random passwords with configurable length and character sets.

HEX・RGB・HSL の色をライブプレビュー付きで変換します。

2 色を任意の比率で混ぜ、融合色とグラデーションを表示します。

Decode and inspect the header and payload of a JSON Web Token.

任意の色に最も近い名前付き色とすべてのコードを判定します。

Percent-encode text for safe use in URLs, or decode encoded URLs back to text.

Compute SHA-1, SHA-256, SHA-384, and SHA-512 hashes of any text.

Generate cryptographically random version-4 UUIDs in bulk.

Count words, characters, sentences, lines, and estimated reading time.

段落・文・単語数を指定してダミーテキストを生成します。

Convert text between UPPER, lower, Title, Sentence, camelCase, snake_case and kebab-case.

Turn any title into a clean, URL-safe slug.

Calculate exact age in years, months, and days from a date of birth.

Find the number of days, working days, and the y/m/d span between two dates.

Convert Unix timestamps to human-readable UTC dates and see the current epoch time.

Convert between currencies using live exchange rates, with a manual fallback.

身長と体重から BMI（体格指数）を計算します。メートル法・ヤードポンド法に対応。