Free Online Calculators
And Web Tools

Scientific Calculator

Type a whole expression with trig, logs, powers, roots and factorials, in degrees, radians or gradians, and see how the order of operations reads it.

Percentage

Seven percentage questions, from percent of a number to reverse percentages and percentage points, each with the working shown line by line.

BMI Calculator

Work out a body mass index in metric or imperial and see where it sits across the whole category band, on either threshold scale.

Mortgage Calculator

The full PITI payment split into its five parts, with the month PMI stops.

Compound Interest

One sum, one rate, and the period by period table that shows interest earning interest.

GPA Calculator

Term and cumulative GPA from credits and letter grades, weighted or unweighted, with the GPA a target needs.

Fraction Calculator

Fraction arithmetic with every step shown, answered in lowest terms, as a mixed number and as a decimal.

Average

Mean of any list, with weighted, geometric, harmonic and trimmed means side by side.

Grade

Course grade from weighted categories or points, with letter, weight covered and the final exam score you need.

Binary Converter

One value in, every base 2 reading out: unsigned, signed, grouped and as text.

Hex Converter

Hex to decimal, binary, octal, text and colour in one go, exact at any length.

MM to Inches

Millimetres to inches with the fraction error stated in mm.

CM to Inches

Centimeters to inches at the precision you choose.

Tip Calculator

Works out the tip on the subtotal or the total with tax, splits the bill so every share adds back to the cent, and shows the real tip when each person rounds up.

Slope

Slope from two points as rise over run, angle, percent grade and line equation.

Volume Calculator

Ten solids, in cubic units and in capacity, with US and Imperial gallons kept apart.

Cylinder Volume

Cylinder capacity in litres and gallons, with hollow, pipe and part filled tank modes.

Cone Volume

V = ⅓πr²h with slant height, surface area, part fill and capacity.

Proportion Calculator

Solve A/B = C/D or A × B = C × D for any missing term, with every line of working.

Random Numbers

Unbiased random numbers in any range, whole or decimal, with or without repeats, plus lottery lines and their odds.

Age Calculator

Exact age in years, months and days on any as of date, with weeks, days, hours, next birthday and weekday born.

Loan Calculator

Builds the full amortisation schedule for any loan, payment by payment, with total interest, payoff date and the APR your fees create.

Statistics

Median, mode, spread, quartiles, outliers, skewness and z scores for any data set.

Pregnancy Calculator

Due date, gestational age and sixteen dated pregnancy milestones from four dating methods.

Investment

Project a lump sum plus regular contributions, in dollars and in today's money.

Car Payment Calculator

Turn a sticker price into a real monthly payment, with the trade-in, the payoff you still owe, sales tax and dealer fees all counted.

Concrete Calculator

Six concrete jobs, answered in cubic yards, cubic metres and five bag sizes with waste already added.

Dice Roller

Roll d4 to d100 in dice notation and see the exact odds of every total.

Area Calculator

Fourteen flat shapes, with the perimeter and the land units beside every answer.

Calorie Calculator

Find maintenance calories on the equation of your choice, then see the deficit and surplus targets drawn to the same scale.

Pythagorean Theorem

Solve a right triangle from any two sides, or test three sides for a right angle.

Ratio Calculator

Simplifies ratios of two to eight parts, shares an amount so the shares add back exactly, scales a mix from one known part, and shows every part as a fraction and a percent of the whole.

Distance

Distance between two points on a plane, in space, or across the Earth.

Ovulation

Your fertile window and ovulation estimate, counted back from the next period.

401(k) Calculator

Project a 401(k) to retirement and see the balance split into your money, the employer match and investment growth.

Rent vs Buy

The break even year, and the two cost piles behind it.

Frustum Calculator

Volume, slant height, surface area and capacity of a truncated cone from two widths and a height.

Online Notepad

Distraction-free notes with autosave and word count.

RGB Color Codes

Pick colors and get RGB, HEX and HSL codes instantly.

ASCII Table

Searchable ASCII reference with dec, hex and binary.

HTML Editor

Write HTML with a live preview that updates as you type.

CSS Beautifier

Format messy CSS with clean indentation instantly.

CSS Minifier

Compress CSS to shrink file size for faster pages.

JS Minifier

Minify JavaScript safely (ASI-safe), right in your browser.

JS Beautifier

Format minified JavaScript into clean, readable code.

Word to HTML

Paste Word text and get clean HTML, or convert back.

Word to PDF

Turn .docx files into selectable-text PDFs in seconds.

PDF to Word

Turn PDFs into editable Word files without uploading them.

Ping Test

Check any site's latency, jitter and packet loss live.