All Free Online Calculators

24 calculators for dates and time, percentages and pricing, business, savings and loans, study and astrology. Every tool shows its formula, a worked example and step-by-step results.

24 of 24 tools

Dates & Time

Ages, gaps between dates, working days and shift hours.

Age CalculatorExact age on any dateExact age, next birthday, shareable result Business Days CalculatorWorking days between two datesCustom weekends and excluded holidays Date Difference CalculatorDays between two datesYears, months, weeks and days Time Duration CalculatorWork hours with breaksOvernight shifts and unpaid breaks

Percentages & Pricing

Increases, discounts, reverse maths and pack comparisons.

Percentage Change CalculatorPercentage increase or decreaseFormula and step-by-step result Reverse Percentage CalculatorOriginal price before a changeOriginal price before increase or discount Unit Price CalculatorCompare packs of different sizesCompare packs of different sizes Discount CalculatorSale price with stacked discountsStacked percentages plus a coupon, step by step

Business & Freelance

Margins, break-even points and rates that cover your goals.

Profit Margin CalculatorMargin after fees and shippingProduct cost, shipping and selling fees Break-Even CalculatorUnits needed to cover costsUnits needed and visual chart Freelance Rate CalculatorHourly rate for your income goalExpenses, billable hours and income goal Hourly to Salary CalculatorConvert hourly pay to annual salaryConvert both ways with your own hours and weeks Overtime Pay CalculatorTime-and-a-half and double timeRegular, overtime and double-time pay in one total

Savings & Loans

Grow savings, project interest and pay debt off sooner.

Savings Goal CalculatorReach a target with monthly depositsTarget date and progress projection Compound Interest CalculatorGrowth with monthly contributionsYear-by-year balance chart Loan Repayment CalculatorPayoff with extra paymentsCompare interest and payoff dates Mortgage CalculatorMonthly payment, deposit, interestMonthly payment, deposit, total interest, yearly table

Tax & Property

UK take-home pay and VAT worked out with current official rates.

UK Take-Home Pay CalculatorSalary after tax and NI (2026/27)Income tax, NI, student loan and pension options VAT CalculatorAdd or remove UK VATAdd or remove VAT at 20%, 5%, 0% or custom

Everyday & Health

Tips, bill splitting and body mass index in seconds.

Tip and Bill Split CalculatorTip and cost per personTip presets, split by people, round up per person BMI CalculatorBody mass index, metric and imperialMetric or imperial, healthy weight range for your height

Learn & Play

Quick quizzes that test your maths and science.

Math & Science Quiz10-question quiz in 3 levelsEasy, medium, hard and mixed – new questions every round

Study

Know exactly what your next exam needs to deliver.

Weighted Grade CalculatorScore needed on your finalRequired score to reach a target grade

Astrology

Your Big Three from birth date, time and place.

Sun, Moon & Rising CalculatorYour Big Three placementsBirth time/location and Big Three result

On the way

Converters – coming soon

PDF tools, image converters and text utilities are in development.

PDF Tools

Convert, combine and shrink PDFs without installing anything.

PDF to WordSoon
Word to PDFSoon
Merge PDFSoon
Split PDFSoon
Compress PDFSoon

Image Converters

Switch formats and resize images in your browser.

Image to PDFSoon
JPG to PNGSoon
PNG to JPGSoon
Image CompressorSoon
Image ResizerSoon

Text & Data

Small everyday utilities for writers and developers.

Word CounterSoon
Case ConverterSoon
QR Code GeneratorSoon
JSON FormatterSoon