Free Online Calculators
2,781 free calculators, converters, generators, and validators for finance, math, health, development, and everyday tasks.
Converters
Instant unit and format converters.
- Angle Converter
- Area Converter
- Celsius to Fahrenheit Converter
- Currency Converter
- Decimal to Hexadecimal
- Energy Converter
- Fahrenheit to Celsius
- Feet to Meters
Generators
Random and content generators.
- Acronym Generator
- Coin Flip (Heads or Tails)
- Color Generator (Random Palette)
- Dice Roller (D6, D20…)
- Haiku Generator
- Hashtag Generator
- List Randomizer / Shuffle
- Nickname Generator
Validators
Things to check and verify.
- Aadhaar Number Validator
- Credit Card Number Validator
- Date Validator
- Email Validator
- GSTIN Validator
- Hex Color Validator
- HTML Tag Validator
- IBAN Validator
Text Tools
Format, transform and analyze text.
- Character Counter
- Extract Email Addresses
- Extract URLs from Text
- Line Diff Compare
- Line Numberer
- List to Comma Separator
- Lorem Ipsum Generator
- Palindrome Checker
Business Tools
Handy business and finance tools.
- Break-Even Calculator
- Compound Interest Calculator
- Discount Calculator
- Gross Profit Margin Calculator
- Loan Payment Calculator
- Markup Calculator
- Net Profit Margin Calculator
- Profit Margin Calculator
Date & Time Tools
Date and time helpers.
- Age Calculator
- Age Difference Calculator
- Business Days Calculator
- Business Hours Calculator
- Date Difference Calculator
- Date to Timestamp
- Day of Year Calculator
- Days Until Calculator
Developer Tools
Coding utilities for developers.
- ASCII / Unicode Character Lookup
- Base64 Decoder
- Base64 Encoder
- Binary to Text Converter
- Caesar Cipher Encoder/Decoder
- Camel Case Converter
- Chmod Calculator
- CRC32 Checksum Generator
SEO Tools
Meta tags, keywords, and SERP tools.
- FAQ Schema Generator (JSON-LD)
- Heading Structure Analyzer
- Keyword Density Checker
- Meta Description Length Checker
- Meta Tag Analyzer
- Readability Checker
- Schema Markup Generator (JSON-LD)
- SERP Preview Simulator (Title & Meta)
Image Tools
Image processing tools.
- Aspect Ratio Calculator
- Color Contrast / WCAG Checker
- DPI / PPI Calculator
- Image Resize Calculator
- Megapixel Calculator
- Print Size Calculator
- Resolution to Aspect Ratio Calculator
Financial Calculators
Loans, mortgages, investments, taxes, and more.
- 1031 Exchange Calculator
- 401(k) Contribution Limits
- 401(k) Match Calculator
- 401k Calculator
- 50/30/20 Budget Calculator
- 529 College Savings Calculator
- ABC Costing Calculator
- Absorption Costing Calculator
Math Calculators
Algebra, geometry, statistics, and advanced math.
- 3D Prism Volume
- Absolute Value Calculator
- Abundant Number Checker
- Adjacency Matrix Calculator
- Advanced Permutation Calculator
- Alternating Series Test
- Angle Between Vectors
- Angle Between Vectors
Fitness & Health Calculators
BMI, calories, body fat, pregnancy, and wellness.
- 10K Pace Calculator
- 1RM Barbell Row Female
- 1RM Barbell Row Male
- 1RM Bench Press Female
- 1RM Bench Press Male
- 1RM Bicep Curl Female
- 1RM Bicep Curl Male
- 1RM Deadlift Female
Other Calculators
Construction, cooking, automotive, and misc tools.
- 12-Ratio Valuation
- 401k Calculator v2
- 401k Match Calculator
- 529 Plan Calculator
- A/B Test Significance
- Absenteeism Cost Calculator
- Accounts Payable Days
- Accounts Receivable Days
About TheMachoBird
TheMachoBird's sole focus is to provide fast, comprehensive, convenient, free online calculators in a plethora of areas. Currently, we have around 2,781 calculators and tools to help you “do the math” quickly in areas such as finance, fitness, health, math, and everyday tasks — and we are still developing more. Our goal is to become the one-stop, go-to site for people who need to make quick calculations.
Every calculator runs entirely in your browser: no signup, no tracking of your inputs, instant results. If you notice even the slightest error, please let us know — your input is extremely valuable to us.