Online Converters
Free online converters for units, dates, colors, time zones and contrast. Instant, on this device, nothing to install.
Find a converter by what you have
- Length, weight, temperature, volume: Unit Converter
- Cups, tablespoons, millilitres: Cooking Converter
- Lakh and crore to millions: Lakh / Crore Converter
- Bytes, KB, MB, GB: File Size Converter
- Time in other cities: Time Zone Converter
- Hours and minutes: Hours Calculator
- Days between two dates: Date Difference
- HEX, RGB and HSL colors: Color Converter
- Binary, decimal, hex, octal: Binary Converter
- Characters to ASCII codes: ASCII Converter
- JPG, PNG and WebP images: Image Converter
- UPPER, lower and Title case: Case Converter
Document Translator
Word, Excel, PowerPoint, HTML, JSON, subtitles. Layout stays. In this tab.
Unit Converter
Length, weight, temperature, volume.
Age Calculator
Exact age in years, months and days.
Time Zone Converter
Same instant in several cities.
Color Converter
HEX, RGB and HSL. Live preview.
Date Difference
Days, months and years between two dates.
Days Until
How many days until a date: or since.
Working Days Calculator
Weekdays between two dates. Weekends skipped.
Hours Calculator
Time between two clocks, added hours, or hours in days.
Add Days
Add or subtract days from a date.
Cooking Converter
Cups, tablespoons, teaspoons and millilitres.
Lakh / Crore Converter
Indian numbering to millions, and back.
File Size Converter
Bytes, KB, MB, GB. SI or 1024.
Sleep Calculator
Bedtimes and wake times in 90-minute cycles.
Due Date Calculator
EDD from last period. Naegeleβs rule.
Ovulation Calculator
Fertile window from last period. Estimate.
Pace Calculator
Pace, time, or distance from what you know.
Water Intake Calculator
Daily water from body weight. A rule of thumb.
Ideal Weight Calculator
Devine formula from height. Estimate only.
Body Fat Calculator
US Navy method. Estimate only.
Heart Rate Zones
Training zones from age. 220 minus age.
One-Rep Max
Epley estimate from weight and reps.
Contrast Checker
WCAG contrast ratio between two colors.
Complementary Color
Opposite hue on the color wheel. Copy HEX.
Number to Words
Spell out a number in English. Copy and go.
Roman Numerals
Arabic to Roman and back. I to MMMCMXCIX.
Aspect Ratio Calculator
Find height, width, or the ratio.
Week Number
ISO week and day of year from a date.
Leap Year Checker
Gregorian leap year? Yes or no.
Fraction Calculator
Add, subtract, multiply or divide two fractions.
Area Calculator
Rectangle, circle or triangle. Any unit.
Volume Calculator
Cube, sphere or cylinder. Any unit.
Mean Median Mode
Average, median and mode from a list.
Standard Deviation
Sample or population Ο from a list.
Download Time Calculator
How long a file takes at a given speed.
Morse Code
Text to Morse and back. Copy and go.
NATO Phonetic Alphabet
Spell words as Alpha, Bravo, Charlie.
GCD and LCM
Greatest common divisor and least common multiple.
Quadratic Equation Solver
Real roots of axΒ² + bx + c = 0.
Permutation Combination
nPr and nCr from n and r.
Pythagorean Theorem
Find a, b, or c on a right triangle.
Scientific Notation
Number β a Γ 10βΏ. Copy and go.
FAQ
Are these converters free?
Yes. Every converter is free, with no account and no limit on how often you use it.
Is anything I enter sent to a server?
No. Conversions run in this browser tab. The Image Converter also works on the file inside this tab, so your picture is not uploaded.
How exact are the unit conversions?
They use the exact international definitions, such as 1 inch = 2.54 cm and 1 pound = 0.45359237 kg. Results show up to eight decimal places.
Do I need to install anything?
No. Every converter is a page that works in the browser on your phone or computer.