Private by default
Your inputs stay in your browser whenever a tool can work locally.
Fast · Free · Private
Everyday problems, solved simply.
Reliable calculators and converters that give you clear answers in seconds. No account, no clutter, no data sent away.
0
no registration required
100%
browser-based calculations
6
supported languages
Popular right now
Start with a useful answer.
Thirty-six useful tools are available for this language, including private browser utilities.
Percentage Calculator
Find a percentage, compare values, or calculate an increase or decrease.
Calculate →Age Calculator
Calculate exact age in years, months and days, total time lived and the next birthday.
Calculate →Discount Calculator
Calculate a sale price, savings amount, or reverse the discount to find the original price.
Calculate →Length Converter
Convert millimeters, centimeters, meters, kilometers, inches, feet, yards and miles.
Calculate →Weight Converter
Convert milligrams, grams, kilograms, tonnes, ounces, pounds and stone.
Calculate →Temperature Converter
Convert Celsius, Fahrenheit and Kelvin with absolute-zero validation.
Calculate →Date Calculator
Find the duration between two dates or add and subtract whole days from a date.
Calculate →Average Calculator
Calculate the mean, sum, count, minimum and maximum of a list of numbers.
Calculate →Ratio Calculator
Simplify a ratio or solve a proportion in the form A : B = C : X.
Calculate →Tip Calculator
Calculate tip, total bill and the amount each person pays when splitting a check.
Calculate →Area Converter
Convert square metric and imperial units, hectares and acres.
Calculate →Volume Converter
Convert milliliters, liters, cubic meters and clearly labeled US customary units.
Calculate →Speed Converter
Convert meters per second, kilometers per hour, miles per hour, knots and feet per second.
Calculate →Data Storage Converter
Convert bits, bytes, decimal KB–TB and binary KiB–TiB units.
Calculate →Compound Interest Calculator
Project investment growth with recurring contributions and flexible compounding.
Calculate →Loan Calculator
Estimate fixed monthly loan payments, total repayment and total interest.
Calculate →Savings Calculator
Project savings growth from an initial balance, monthly deposits and annual return.
Calculate →BMI Calculator
Calculate adult body mass index using metric or US customary measurements.
Calculate →Fraction Calculator
Add, subtract, multiply or divide two fractions and simplify the result.
Calculate →Scientific Calculator
Evaluate powers, roots, logarithms, percentages and trigonometric expressions safely.
Calculate →Mortgage Calculator
Estimate monthly mortgage payments including principal, interest, property tax, insurance and fees.
Calculate →Calorie Calculator
Estimate adult resting energy and daily maintenance calories from body size and activity.
Calculate →Time Duration Calculator
Calculate hours and minutes between two clock times, including overnight periods.
Calculate →Fuel Cost Calculator
Estimate trip fuel, total cost and cost per kilometer using regional efficiency units.
Calculate →GPA Calculator
Calculate a credit-weighted US-style GPA on a 4.0 scale.
Calculate →Word & Character Counter
Count words, characters, sentences and paragraphs, with reading and speaking time.
Open tool →Password Generator
Create strong random passwords locally with adjustable length and character sets.
Open tool →QR Code Generator
Turn a URL, text or contact detail into a downloadable QR code.
Open tool →Image Compressor
Compress JPG, PNG and WebP images locally without uploading the file.
Open tool →Image Resizer & Cropper
Resize or center-crop an image to exact pixel dimensions in your browser.
Open tool →Time Zone Converter
Convert a date and time between major world time zones with daylight-saving rules.
Open tool →Online Timer & Stopwatch
Use a countdown timer or stopwatch that keeps running in the current browser tab.
Open tool →Random Toolkit
Generate random numbers, pick names, shuffle lists and split teams securely.
Open tool →Pregnancy Due Date Calculator
Estimate a due date from the first day of the last menstrual period and usual cycle length.
Calculate →Ovulation & Fertile Window Calculator
Estimate ovulation, the fertile window and the next period from a regular cycle.
Calculate →Body Fat Percentage Calculator
Estimate body fat percentage from height and circumference measurements using the U.S. Navy method.
Calculate →Macro Calculator
Convert a daily calorie target and macro percentages into grams of protein, carbohydrate and fat.
Calculate →Water Intake Calculator
Plan an approximate daily fluid range from body weight and exercise time.
Calculate →Running Pace Calculator
Calculate pace per kilometer and mile plus average speed from distance and time.
Calculate →Sleep Time Calculator
Plan possible bedtimes or wake-up times using adjustable sleep-cycle assumptions.
Calculate →BAC Estimator
Estimate blood alcohol concentration from body weight, drinks and elapsed time—with a strict driving warning.
Calculate →Credit Card Payoff Calculator
Estimate payoff time and total interest from a card balance, APR and fixed monthly payment.
Calculate →Debt Payoff Calculator
Compare debt snowball and highest-interest-first repayment using up to three debts.
Calculate →Retirement Calculator
Project retirement savings from a current balance, monthly contributions and an assumed return.
Calculate →FIRE Calculator
Estimate a financial-independence target and the time needed to reach it.
Calculate →ROI Calculator
Calculate total and annualized return from investment value, income, fees and time.
Calculate →Dividend Calculator
Estimate annual and monthly dividend income, yield and share count.
Calculate →Inflation Calculator
Compare future equivalent cost and purchasing power using an assumed inflation rate.
Calculate →Emergency Fund Calculator
Set an emergency savings target from essential monthly expenses and desired coverage.
Calculate →Net Worth Calculator
Add assets and liabilities to calculate a simple personal net worth snapshot.
Calculate →50/30/20 Budget Calculator
Split monthly income into needs, wants and saving or debt payoff with adjustable percentages.
Calculate →U.S. Overtime Pay Calculator
Estimate federal FLSA weekly overtime pay for a covered, nonexempt hourly employee.
Calculate →Exchange Rate Calculator
Use the latest reference rate or compare year-end rates from the last five years.
Open tool →Take-home Pay Estimator
Estimate annual and monthly net pay with adjustable payroll deductions.
Open tool →Income Tax Calculator
Compare national income-tax estimates across 2022–2026.
Open tool →Browse by purpose
Find the right tool faster.
Choose a category to narrow the available tools.
55 tools shown.
Why Easynivo
Useful without the usual friction.
Clear, not clever
We show the answer, the formula and an example in plain language.
Made for every screen
Fast, touch-friendly tools designed mobile-first and accessible by keyboard.