All Tools
Every calculator and converter Numerila offers: 100 tools across 10 categories, grouped below by category. See the About page for what Numerila is.
Maths
- Basic CalculatorAdd, subtract, multiply and divide with a keypad, for quick everyday sums.
- Scientific CalculatorWork out expressions with brackets, powers, roots, logarithms and trigonometry, in degrees or radians.
- Percentage CalculatorWork out a percentage of a number, what percentage one number is of another, or the original number. Fill in any two values.
- Percentage Change CalculatorFind the percentage increase or decrease between two values, or the new or original value from a percentage change.
- Percentage Difference CalculatorCompare two values symmetrically as a percentage of their average, with no baseline value.
- Average CalculatorFind the average (mean) of a list of numbers, with the total and the count shown so you can check it.
- Ratio CalculatorSimplify ratios, solve proportions and scale ratios.
- Fraction CalculatorAdd, subtract, multiply and divide fractions, with the answer simplified and also shown as a decimal.
- Rounding CalculatorRound numbers to a chosen number of decimal places or significant figures, or to the nearest ten, hundred or thousand.
- Square Root CalculatorFind the square root of a number, shown as exact when it is a perfect square.
- Exponent CalculatorRaise a number to a power, including negative and fractional exponents, with exact results marked as exact.
- Logarithm CalculatorCalculate a logarithm to base 10, base e, base 2 or any base you choose, with exact results marked as exact.
- Quadratic Formula CalculatorSolve ax² + bx + c = 0 with the quadratic formula, showing the discriminant and the real roots.
- Roman Numeral ConverterConvert a whole number to a Roman numeral, or a Roman numeral to a number, from 1 to 3,999.
- Combination CalculatorCount the ways to choose r items from n when order does not matter, as an exact whole number.
- Permutation CalculatorCount the ways to arrange r items chosen from n when order matters, as an exact whole number.
Statistics
- Mean, Median, Mode & RangeFind the mean, median, mode and range of a list of numbers in one step.
- Standard Deviation CalculatorFind the standard deviation of a data set, for a whole population or for a sample.
- Variance CalculatorFind the variance of a data set, for a population or a sample.
- Quartiles & IQR CalculatorFind Q1, the median, Q3 and the interquartile range (IQR) of a data set.
- Weighted Average CalculatorCalculate a weighted average from values and their weights. Weights do not need to total 100.
- Z Score CalculatorFind how many standard deviations a score is from the mean, from the mean and standard deviation you enter.
- Percentile CalculatorFind the value at a chosen percentile of a data set, using inclusive linear interpolation.
- Probability CalculatorFind the probability of an event from favourable and total outcomes, as a fraction, decimal and percentage.
Converters
- Unit ConverterConvert between units in any of 14 categories, from length and mass to energy, pressure and fuel economy.
- Length & Distance ConverterConvert between metric and imperial units of length and distance, such as kilometres, miles, feet and inches.
- Mass & Weight ConverterConvert between metric and imperial units of mass and weight, such as kilograms, pounds and ounces.
- Temperature ConverterConvert between Celsius, Fahrenheit and Kelvin, or read an oven setting as a gas mark and a temperature.
- Area ConverterConvert between metric and imperial units of area, such as square metres, acres and square feet.
- Volume ConverterConvert between metric and imperial units of volume, such as litres, millilitres and gallons.
- Speed ConverterConvert between common speed units such as mph, km/h and m/s.
- Data Storage ConverterConvert between bits, bytes, kilobytes, megabytes and related units.
- Energy ConverterConvert between joules, calories, kilowatt hours, BTU and other energy units.
- Power ConverterConvert between watts, kilowatts, horsepower and BTU per hour.
- Pressure ConverterConvert between pascals, bar, atmospheres, psi, torr and mmHg.
- Angle ConverterConvert between degrees, radians, gradians, turns, arcminutes and arcseconds.
- Fuel Economy ConverterConvert between mpg (US and Imperial), litres per 100 km and kilometres per litre.
- Density ConverterConvert a density between kg/m³, g/cm³, g/mL, kg/L, lb/ft³ and similar units.
- Frequency ConverterConvert between hertz, kilohertz, megahertz, gigahertz, terahertz and rpm.
- Currency ConverterConvert between world currencies using dated reference exchange rates.
Time & Date
- Age CalculatorCalculate exact age in years, months and days from a date of birth.
- Date Difference CalculatorCalculate the difference between two dates in years, months and days.
- Days Between DatesCount the number of days between two dates.
- Add or Subtract DateAdd or subtract days, weeks, months or years from a date.
- Time Duration CalculatorFind the time between two dates and times, with an optional break.
- Hours CalculatorAdd up a list of hours and minutes to find the total time.
- Unix Timestamp ConverterConvert between Unix timestamps and readable dates and times.
- Time Zone ConverterConvert a date and time from one time zone to another, with clock changes handled explicitly.
- Business Days CalculatorCount the weekdays, Monday to Friday, between two dates. Public holidays are not excluded.
- Countdown CalculatorCount down the days, hours, minutes and seconds to a date and time you choose.
- Military Time ConverterConvert between 12 hour clock times and 24 hour (military) times.
Text
- Word CounterCount words, lines and paragraphs, with a reading time.
- Character CounterCount characters in a block of text, with and without spaces.
- Case ConverterConvert text between uppercase, lowercase, title case and sentence case.
- Whitespace CleanerTidy text by removing repeated spaces, trailing spaces and extra blank lines, with an option for each.
- Duplicate Line RemoverRemove repeated lines from a block of text, keeping the first of each in its original order.
- Text SorterSort the lines of a text from A to Z or Z to A, changing nothing else.
- Slug GeneratorTurn a title or phrase into a lower case, hyphen separated slug for a web address.
- Text Difference CheckerCompare two texts line by line and see which lines were added, removed or left unchanged.
Random & Generators
- Random Number GeneratorGenerate a random whole number between a minimum and a maximum you choose.
- Random List PickerPick one or more random items from a list you paste in, or shuffle the whole list.
- Password GeneratorGenerate a strong random password with configurable rules.
- UUID GeneratorGenerate one or more random version 4 UUIDs (universally unique identifiers) to copy.
- QR Code GeneratorCreate a QR code from text or a web address, and choose its size.
- Random Team GeneratorSplit a list of names into random teams that differ in size by no more than one.
Technology
- Base64 Encoder & DecoderEncode text as Base64, or decode Base64 back to readable text, without leaving your browser.
- Binary / Decimal / Hex ConverterConvert numbers between binary, decimal and hexadecimal.
- JSON FormatterFormat, compact or check JSON, with clear errors that show the line and column.
- URL Encoder & DecoderPercent encode or decode text for use in one part of a web address.
- Hash GeneratorGenerate SHA-256, SHA-384 and SHA-512 hashes of text in your browser.
- Regex TesterTest a JavaScript regular expression against text and see every match and group.
- Colour ConverterConvert colours between HEX, RGB and HSL, with a preview beside the values.
- CSS Unit ConverterConvert between the fixed CSS length units px, in, cm, mm, Q, pt and pc.
- HTML Entity Encoder & DecoderEncode text as HTML entities, or decode entities back to text.
Cooking
Everyday
- Discount CalculatorWork out the final price after a percentage discount, the discount itself, or the original price before it.
- Tip CalculatorWork out the tip and the total for a bill, from the percentage you choose.
- Compound Interest CalculatorCalculate compound interest on a starting amount over a number of years.
- VAT CalculatorAdd VAT to a net amount, remove it from a gross amount, or find the rate, using a rate you enter.
- Simple Interest CalculatorWork out simple interest and the total, or find the principal, rate or time from the other values.
- Margin CalculatorWork out profit margin as a percentage of revenue, or the cost or revenue that gives a margin you want.
- Markup CalculatorWork out markup as a percentage of cost, or the cost or selling price that gives a markup you want.
- Unit Price CalculatorWork out the price per unit from a total and a quantity, or find the total or quantity from the other two.
- Break-even CalculatorFind how many units must be sold for the contribution to cover fixed costs.
- Split Bill CalculatorSplit a bill equally between a number of people to see what each person pays.
- Fuel Cost CalculatorEstimate the fuel used and the cost of a journey from distance, fuel economy and a price you enter.
- Electricity Cost CalculatorEstimate the energy an appliance uses and what it costs, from its power, the time used and your price per kWh.
- Paint CalculatorEstimate how much paint a wall area needs, from the coverage on the tin and the number of coats.
- Flooring CalculatorWork out the flooring area a room needs, with an optional allowance, pack coverage and price of your own.
- Concrete CalculatorFind the volume of concrete for a simple rectangular slab or block, with an optional allowance.
- Square Footage CalculatorFind the area of a rectangle from its length and width, in square feet, square metres and square yards.
- Tile CalculatorWork out how many tiles cover a surface, as an exact count and as whole tiles, with an optional allowance.
- Mulch CalculatorFind the volume of mulch needed to cover an area to a chosen depth.
- Gravel CalculatorFind the volume of gravel needed to cover an area to a chosen depth.
- Fence CalculatorWork out the posts and sections for a straight fence from its length and the spacing between posts.
- Grade CalculatorWork out an overall grade from the points earned and the points possible.
- GPA CalculatorWork out a GPA from the grade points and credits of each course, on your own scale.
- Final Grade CalculatorFind the score needed on a final assessment to reach a target course grade.