OmniCalcsFree Online Calculators for Finance, Health, Math, Conversions & More
OmniCalcs brings every calculator you need into one fast, modern hub — clear results, real formulas, and zero guesswork. 100% free, no sign-up, ever.
Calculator Categories
Pick a category to see every tool inside it.
Financial Calculators
Mortgages, loans, investing, retirement and more.
Health Calculators
BMI, calories, pregnancy tracking and fitness tools.
Math Calculators
Percentages, fractions, statistics and everyday math.
Conversion Calculators
Length, weight, temperature and unit conversions.
Date & Time Calculators
Age, countdowns, work hours, time zones and more.
Text Tools
Word counts, case conversion, diff checking and more.
Developer Tools
JSON, passwords, colors, hashes and networking tools.
Extra Tools
Budget planner, image resizer, typing test and more.
Image Tools
Convert, crop, encode, merge and transform images — no uploads.
Cooking Tools
Scale recipes, convert oven temperatures and cooking units.
Featured Calculators
The tools our visitors reach for most.
Mortgage Calculator
Estimate your monthly home payment.
BMI Calculator
Check your body mass index instantly.
Percentage Calculator
Find percentages in seconds.
Length Converter
Convert between 12 units of length.
Age Calculator
Your exact age in years, months, days.
Word & Character Counter
Count words, characters and lines live.
JSON Formatter & Validator
Pretty-print and validate JSON.
Password Generator
Create strong random passwords.
From the OmniCalcs Blog
Guides that explain the formulas behind the numbers.
Common Questions
Are all calculators on OmniCalcs free?
Yes — every calculator on OmniCalcs is 100% free with no sign-up required, and it always will be.
How accurate are the results?
Each calculator uses standard, published formulas (shown on every calculator page) so you can verify the math yourself.
Can I use OmniCalcs on my phone?
Yes. Every page is built mobile-first and works smoothly on phones, tablets, and desktops.
Will more calculators be added?
New calculators are added regularly. Check the "Recently Added" section on the homepage or subscribe via the blog.