FigureKind — Free Online Calculators and Tools

Popular calculators and tools

A good place to start — the pages people use most.

Basic Calculator

Add, subtract, multiply and divide with brackets, percentages and full keyboard support.

Percentage Calculator

Find P% of a number, what percent one number is of another, or the total from a percentage.

Age Calculator

Calculate exact age in years, months and days, total days lived and the next birthday.

Days Between Dates

Count the days between two dates, optionally including the end date, with weekdays and weekends.

Length Converter

Convert between millimeters, centimeters, meters, kilometers, inches, feet, yards and miles.

GPA Calculator

Calculate a credit-weighted GPA with an editable grading scale and optional cumulative GPA.

Compound Interest Calculator

Project savings growth with compounding, regular contributions and a year-by-year breakdown.

Loan Payment Calculator

Estimate loan repayments, total interest and an amortization schedule for any payment frequency.

BMI Calculator

Calculate adult body mass index in metric or imperial units with WHO reference categories.

Scientific Calculator

Trigonometry, logarithms, powers, roots, factorials and constants in degrees or radians.

Time Zone Converter

Convert a date and time between any two time zones, with daylight saving time handled.

Mortgage Calculator

Estimate your monthly mortgage payment including tax, insurance, HOA fees and PMI.

Calculators

Maths, dates, money, health and more — each one shows how the answer is worked out.

All calculators

Everyday Maths

9 calculators

Arithmetic, percentages, discounts, averages, ratios and fractions for homework, shopping and work.

Numbers, Algebra and Statistics

15 calculators

Scientific calculations, equations, statistics, prime factors, number bases, rounding and random numbers.

Date and Time

7 calculators

Exact ages, the gap between two dates, adding days, time zones and durations — with leap years handled correctly.

Unit Conversions

11 calculators

Convert length, weight, temperature, volume, area, speed, pressure, energy and data storage, and estimate fuel costs.

Education

4 calculators

Work out exam percentages, letter grades, GPA, final exam targets and weighted averages using your own grading rules.

Finance and Shopping

17 calculators

Mortgages, loans, interest, savings, inflation, salary, margins and tax — estimates that show the formula behind them.

Health and Fitness

12 calculators

BMI, body fat, calorie and macro needs, heart-rate zones, running pace and pregnancy due dates.

Geometry

3 calculators

Area, perimeter, volume and surface area of common shapes, and the Pythagorean theorem.

Online tools

PDF, image, colour, text and developer tools. Your files and text never leave your device.

All tools

Text Tools

11 tools

Count words, change case, clean up, sort, de-duplicate and compare text — all in your browser.

Developer Tools

36 tools

Format JSON, XML, SQL and CSS, convert CSV and YAML, encode Base64 and URLs, generate hashes and HMACs, decode JWTs, explain cron schedules and more.

Generators

6 tools

Secure passwords, QR codes, barcodes and fair random picks — generated on your device.

Image Tools

21 tools

Resize, compress, convert, crop and watermark images — one at a time or in bulk — pick colours, make favicons and remove hidden metadata, without uploading your photos.

Color Tools

6 tools

Convert colour codes, check WCAG contrast, and generate palettes, gradients, tints and shades for design and code.

PDF Tools

15 tools

Merge, split, rotate, compress, number and watermark PDFs, and convert between PDFs and images — in your browser, without uploading your documents.

Business and Productivity

5 tools

Create invoices, email signatures and contact QR codes, and stay focused with timers — all in your browser.

How it works

No accounts, no downloads, no waiting.

Find a tool

Search above or pick a category. Every calculator and tool has its own page.

Enter your values

The result appears right next to your inputs and updates as you type. Nothing you enter is sent to our server.

Understand the answer

Each page explains the formula or method, gives an example and lists its limitations.

Common questions

Short answers about how this site works.

Are these calculators and tools free?

Yes. Everything is free to use without registration. The site may show clearly labelled advertising to cover running costs.

Do you store the numbers, text or files I enter?

No. Calculations and file processing run in your web browser; what you enter is not sent to or stored on our server. See the privacy policy for details.

How accurate are the results?

Formulas are checked against known reference values with automated tests. Results depend on the values you enter and on each page’s stated assumptions, so treat financial and health figures as estimates.

Can I suggest a tool or report a problem?

Please do — see the contact page. Reports that include the inputs you used help us fix issues quickly.

Every calculator and tool, A–Z All 178 pages, grouped by category.

Fast, accurate calculators and online tools