Quick calculations for everyday life.
Solve everyday calculations quickly. CalcBox is a free collection of handy calculator tools.
Recently Used Tools
BMI Calculator & Ideal Weight
Calculate BMI from height and weight, check obesity level and ideal weight.
Date Calculator (Days Between)
Calculate the number of days between two dates. Useful for planning periods.
Age Calculator (From DOB)
Calculate current age from date of birth. Also check age at a specific date.
Calorie Burn Calculator
Calculate calories burned by exercise and daily activities. Useful for dieting.
Split Bill Calculator
Easily split the bill for dining out. Handles rounding automatically.
Sales Tax Calculator
Instantly convert between tax-inclusive and tax-exclusive prices.
Loan Calculator
Simulate monthly payments and total costs for mortgages and auto loans.
Electricity Cost Calculator
Calculate monthly/yearly electricity costs from appliance wattage.
Unit Converter
Easily convert units for length, weight, temperature, and area.
Time Calculator
Add/subtract time, convert minutes, and calculate hourly wages.
Pet Age Calculator
Convert dog/cat age to human years. Supports size-based conversion.
Discount Calculator
Calculate discounted prices from percentage or amount. Supports double discounts.
Password Generator
Generate secure passwords with one click. Includes strength meter.
Character Counter
Count characters, lines, and bytes in real-time.
Compound Interest Calculator
Simulate asset growth with compound interest. Supports recurring deposits.
Body Fat Calculator
Estimate body fat percentage from height, weight, age, and gender.
Base Converter
Convert between binary, octal, decimal, and hexadecimal in real-time.
Salary Calculator (Japan)
Estimate take-home pay from gross salary. Shows insurance and tax breakdown.
Area Calculator
Calculate areas of various shapes. Supports unit conversion.
Color Converter
Convert between HEX, RGB, and HSL. With color picker and preview.
Speed/Distance/Time Calculator
Calculate speed, distance, and time relationships. Marathon pace calculator included.
Japanese Era Converter
Convert between Japanese eras (Reiwa, Heisei, Showa, etc.) and Western years.
Random Number Generator
Generate random numbers in a specified range. Great for lotteries and draws.
Statistics Calculator
Calculate mean, median, standard deviation, and variance at once.
JSON Formatter
Format, minify, and validate JSON. Essential developer tool.
QR Code Generator
Instantly generate QR codes from text or URLs. PNG download supported.
Timezone Converter
Display current time in major cities worldwide. Convenient for time difference calculations.
Countdown Timer
Real-time countdown to your target date and time.
Stopwatch
Precise stopwatch with lap time recording feature.
Hash Generator (SHA-256)
Generate SHA-1/SHA-256/SHA-512 hashes from text.
Age Lookup Table (2026)
Year, Japanese era, age, and zodiac lookup table with search filter.
Furusato Tax Calculator (Japan)
Simulate the maximum deduction for Japan's Furusato tax donation program.
Housing Loan Deduction (Japan)
Simulate annual and total housing loan tax deductions. See tax savings at a glance.
Pregnancy Week Calculator
Calculate pregnancy weeks and due date from last menstrual period. Shows pregnancy milestones.
Sleep Calculator
Calculate optimal bedtime/wake time based on 90-minute sleep cycles.
BMR Calculator
Calculate basal metabolic rate and daily calorie expenditure from age, height, weight, and gender.
Part-time Pay Calculator
Estimate daily/monthly/yearly pay from hourly wage and work hours.
Point Reward Calculator
Calculate earned points and effective discount from reward rates. Compare cards easily.
Pension Simulator (Japan)
Estimate future pension benefits from income and enrollment period. Compare early/delayed options.
Alcohol Metabolism Calculator
Calculate alcohol metabolism time and estimated sober time from drinks and body weight.
Ideal Weight Calculator
Calculate ideal weight from height and suggest calorie restriction for your goal.
Currency Converter
Convert between 10 major currencies: JPY, USD, EUR, GBP, and more.
Encoder/Decoder
Base64, URL, and HTML encode/decode with one click.
Regex Tester
Test regex patterns in real-time. Highlights matching text.
IP Address Calculator
Calculate network address, broadcast, and host range from CIDR notation.
Probability Calculator
Calculate permutations (nPr), combinations (nCr), and factorials. Coin/dice presets included.
CSS Gradient Generator
Visually create linear/radial gradients. Copy CSS code instantly.
Markdown Preview
Preview markdown in real-time. Copy HTML output supported.
Text Diff Checker
Display differences between two texts with color highlighting. Line-by-line comparison.
Loan Comparison
Compare up to 3 loan conditions side by side. Find the best plan at a glance.
Nutrition Calculator
Calculate nutrients and calories from foods. Built-in database of 38 food items.
UUID Generator
Generate v4 UUIDs with one click. Bulk generation and validation included.
Unix Timestamp Converter
Convert between Unix timestamps and dates bidirectionally. Shows current timestamp in real-time.
JWT Decoder
Parse JWT token headers and payloads. Includes expiration check.
Cron Expression Parser
Explain cron expressions in human-readable form. Shows next execution times with presets.
chmod Permission Calculator
Set file permissions intuitively with checkboxes. Supports octal and symbolic notation.
CSV / JSON Converter
Bidirectional CSV and JSON conversion. Delimiter selection and preview table included.
SQL Formatter
Format SQL statements for readability. Keyword highlighting and minification included.
Byte Converter
Convert B/KB/MB/GB/TB/PB. Toggle between binary (1024) and decimal (1000).
HTTP Status Codes
Searchable and filterable HTTP status code reference.
Lorem Ipsum Generator
Generate dummy text by paragraphs, sentences, or word count. Great for web design.