Free Online Tools, 100% Private
35 free everyday tools that run entirely in your browser โ your data never leaves your device. No sign-up, no uploads, no tracking.
๐ฐ Money Calculators
Mortgage Calculator
Monthly payment, total interest & payoff for fixed-rate loans
Mortgage Extra Payment
How much interest a lump-sum prepayment saves โ term vs payment
Retirement Age Calculator
Your Social Security FRA, plus benefit impact of claiming 62โ70
Compound Interest
Grow your savings: principal + monthly contributions over time
Savings Interest Calculator
Lump-sum deposit: ending balance, interest earned and APY
Tip Calculator
Tip amount, total and per-person split in seconds
Sales Tax Calculator
US state tax rates, tax amount and final checkout price
Discount Calculator
Sale price and savings for any % off โ stacked deals too
Car Loan Calculator
Monthly payment, total interest and payoff schedule for auto loans
Fuel Cost Calculator
Road trip gas cost, cost per mile and per-person split
ROI Calculator
Return on investment, annualized ROI and payback period
Salary Calculator
Hourly, weekly, monthly and annual pay โ plus take-home estimate
Debt Payoff Calculator
Compare snowball vs avalanche and see your debt-free date
Overtime Calculator
Time-and-a-half pay, weekly gross and California daily OT
๐งฎ Everyday Calculators
Percentage Calculator
Percent of a number, ratios and percent change
BMI Calculator
Body Mass Index in metric or imperial units, WHO categories
Calorie Calculator
Daily calorie needs (TDEE) and targets for losing or gaining weight
BMR Calculator
Basal metabolic rate from Mifflin-St Jeor & Harris-Benedict, plus TDEE table
Body Fat Calculator
US Navy tape method: body fat %, fat mass and lean mass
Pace Calculator
Running pace, finish time and splits in miles or kilometres
Age Calculator
Exact age in years, months and days โ plus your next birthday
Date Calculator
Days between dates, weekdays and countdowns
Unit Converter
Length, weight and temperature โ metric โ imperial
Random Number
Random integers in any range, with or without duplicates
GPA Calculator
Semester GPA on the 4.0 scale, plus a cumulative projection
Aspect Ratio Calculator
Simplify any ratio and scale to a new size without distortion
Number Base Converter
Binary, octal, decimal, hex or any base 2-36 โ BigInt exact
๐ Text & Security
Word Counter
Words, characters, sentences and reading time as you type
Password Generator
Strong random passwords, generated locally on your device
URL Encoder / Decoder
Percent-encoding both ways, plus a query-string inspector
JSON Formatter
Beautify, minify and validate โ with the exact line and column of any error
Base64 Encoder / Decoder
UTF-8 safe both ways, URL-safe alphabet, file to data URI
Unix Timestamp Converter
Epoch seconds or milliseconds to local time, UTC and ISO 8601
๐งพ Work & Business
๐ Recommended for You
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๐ Knowledge Articles
How Extra Mortgage Payments Compound Into Years of Savings
A worked example showing why paying a little extra on your mortgage each month can cut the loan term by years and save tens of thousands in interest โ with the math behind it.
The Power of Compound Interest: Why Starting Early Beats Saving More
A side-by-side example of two savers where the one who starts earlier โ with less money โ ends up richer, and the simple reason compound growth rewards time more than amount.
BMI Is a Screen, Not a Verdict: 3 Common Misreads
What Body Mass Index actually measures, where it helps, and the three ways people routinely misread it โ with guidance on better signals for your health.
Strong Passwords Explained: Entropy, Length, and Why Reuse Hurts
Why a long random passphrase beats a 'clever' short password, how entropy measures real strength, and the one habit that prevents most breaches.
Percentages Trap Everyone: 3 Calculations That Regularly Go Wrong
The three percentage mistakes even careful people make โ successive discounts, percent change, and back-calculating tax โ with the correct formulas.
What Is a Unix Timestamp and Why Your Apps Rely on It
The simple integer behind nearly every 'time' field in software โ what a Unix timestamp is, the 2038 bug, and how to convert it back to a real date.