Utility toolkit
Utility calculators for solve the everyday math.
Free everyday calculators for percentages, geometry, and general math — fast answers without the complexity.
Popular utility calculators
- Random Number GeneratorGenerate random numbers in any range, with no-repeat and sort optionsEveryday math
- Word CounterCount words, characters, sentences, and paragraphs with reading timeText & generators
- kg to lbs ConverterConvert kilograms to pounds and back — 1 kg = 2.20462 lbsUnit conversions
- cm to Inches ConverterConvert centimeters to inches and back — 1 cm = 0.3937 inUnit conversions
55 calculators
Everyday math
6- Percentage CalculatorCalculate percentages, percentage change, and percentage increases or decreases
- Fraction CalculatorAdd, subtract, multiply, and divide fractions with automatic simplification
- Average CalculatorMean, median, mode, range, and sum from any list of numbers
- Ratio CalculatorSimplify ratios, solve proportions, and scale mixtures
- Scientific CalculatorFull-featured scientific calculator with trig, log, and advanced functions
- Random Number GeneratorGenerate random numbers in any range, with no-repeat and sort options
Algebra & numbers
9- Quadratic Equation SolverSolve ax²+bx+c=0 — roots, discriminant, and vertex
- Slope CalculatorSlope, line equation, distance, and midpoint from two points
- Exponent CalculatorRaise any base to any power, including negative and fractional
- Logarithm Calculatorlog base b, natural log (ln), log₁₀, and log₂
- Square Root CalculatorSquare root, cube root, or nth root with simplified radical
- LCM & GCD CalculatorLeast common multiple and greatest common divisor (GCF/HCF)
- Prime Factorization CalculatorPrime factors, primality check, and all divisors of a number
- Scientific Notation ConverterConvert numbers to scientific, E, and engineering notation
- Roman Numeral ConverterConvert numbers to Roman numerals and back, from 1 to 3,999
Geometry
5- Area CalculatorCalculate the area of square, rectangle, circle, triangle, and more with unit conversion
- Perimeter CalculatorPerimeter of a rectangle, square, triangle, or circle circumference
- Volume CalculatorCalculate volume of cubes, cylinders, spheres, cones, and more
- Circle CalculatorCalculate radius, diameter, area, and circumference from any known value
- Triangle CalculatorSolve any triangle using SSS, SAS, or AAS with angles and area
Statistics & probability
3Dates & time
6- Age CalculatorExact age in years, months, and days — with totals and birthday countdown
- Date CalculatorDays between dates (with business days) or add days to any date
- Days Until CalculatorCount down the days, weeks, and months from today to any date
- Time CalculatorAdd, subtract, and compare time durations and find time differences
- Time Zone ConverterConvert time between world zones with automatic daylight saving
- Military Time ConverterConvert between 12-hour and 24-hour (military) time
Unit conversions
18- Unit ConverterConvert length, weight, temperature, volume, area, speed, and time units
- kg to lbs ConverterConvert kilograms to pounds and back — 1 kg = 2.20462 lbs
- Stone to Pounds ConverterConvert stone to pounds and back — 1 stone = 14 lbs
- Pounds to Ounces ConverterConvert pounds to ounces and back — 1 lb = 16 oz
- Grams to Ounces ConverterConvert grams to ounces and back — 1 oz = 28.3495 g
- cm to Inches ConverterConvert centimeters to inches and back — 1 cm = 0.3937 in
- cm to Feet ConverterConvert centimeters to feet and back — ideal for height
- Inches to Feet ConverterConvert inches to feet and back — 12 in = 1 ft
- Meters to Feet ConverterConvert meters to feet and back — 1 m = 3.28084 ft
- km to Miles ConverterConvert kilometers to miles and back — 1 km = 0.621371 miles
- mph to km/h ConverterConvert miles per hour to km/h and back — 1 mph = 1.60934 km/h
- Speed CalculatorSolve for speed, distance, or time using Distance = Speed × Time
- Celsius to Fahrenheit ConverterConvert °C to °F and back — °F = °C × 9/5 + 32
- ml to oz ConverterConvert milliliters to US fluid ounces and back — 1 fl oz = 29.5735 ml
- Cups to mL ConverterConvert US cups to milliliters and back — 1 cup = 236.588 ml
- Liters to Gallons ConverterConvert liters to US gallons and back — 1 gal = 3.78541 L
- Square Feet to Square Meters ConverterConvert sq ft to sq m and back — 1 sq ft = 0.0929 sq m
- Acres to Square Feet ConverterConvert acres to square feet and back — 1 acre = 43,560 sq ft
School & study
4- GPA CalculatorCalculate weighted GPA on the 4.0 scale with letter grades and credit hours
- Grade CalculatorWeighted course grade and the score you need on the final
- Test Score CalculatorPercentage, letter grade, and how many you can miss for a target
- Study Time CalculatorHow many hours a day to study before an exam, and if it's realistic
Text & generators
4- Word CounterCount words, characters, sentences, and paragraphs with reading time
- Character CounterCount characters with and without spaces, plus platform limits
- Reading Time CalculatorConvert a word count into reading or speaking time at any pace
- Password GeneratorCreate strong random passwords in your browser with a strength meter
Utility calculator FAQ
- What can I calculate in the utility category?
- Everyday math and conversions: percentages, fractions, averages, statistics, geometry, age and date differences, GPA and grades, unit conversions, scientific math, plus text tools like the word counter, character counter, and password generator.
- How accurate are the unit conversions?
- Conversions use the standard international definitions — for example 1 inch is exactly 2.54 cm and 1 pound is about 0.4536 kg — and are accurate to well beyond everyday precision. Results are rounded only for display.
- Is text I paste into the word or character counter stored?
- No. Text tools and the password generator run entirely in your browser. What you type or generate is never sent to our servers.