Free
VAT calculator
Add or remove VAT and see the net, tax and gross amounts instantly.
Complete tool library
Find the right tool and finish the job.
Search 109 free calculators, converters, writing helpers and browser utilities. Every tool has a dedicated page, worked example and clear limitations.
109working tools, with more being added thoughtfully.
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109 useful tools.
Guests can run 3 public tools per rolling 24 hours. A verified free account receives 10; Premium removes the limit.
Free
Percentage calculator
Find what percentage one number is of another, with the decimal fraction and ratio.
Free
Percentage change calculator
Compare an old and new value to measure the percentage increase or decrease.
Free
Profit margin calculator
Calculate gross profit, profit margin, markup and the cost ratio from a selling price.
Free
Compound interest calculator
Project savings growth with regular contributions and different compounding frequencies.
Free
Loan repayment calculator
Estimate monthly repayments, total interest and an amortisation schedule.
Free
Savings goal planner
Work out the regular amount needed to reach a target by a chosen date.
Free
Hourly rate calculator
Turn an income target, working pattern and business costs into a sustainable hourly rate.
Free
Break-even calculator
Find the sales volume needed to cover fixed costs at a given price and variable cost.
Free
Invoice total calculator
Calculate an invoice total after a percentage or fixed discount and an editable VAT or tax rate.
Free
Meeting cost calculator
Estimate the combined staff cost of a meeting from time, attendees and hourly rates.
Free
Subscription cost comparer
Compare monthly and annual subscriptions after discounts, setup fees and expected use.
Free
Shared bills splitter
Split a household bill equally after discounts, extra costs and a service charge.
Free
Paint calculator
Estimate wall area, paint litres and tins from room dimensions, coats and coverage.
Free
Wallpaper roll calculator
Estimate wallpaper rolls from wall size, roll dimensions, pattern repeat and waste.
Free
Flooring area calculator
Calculate floor area, waste allowance and the number of packs to buy.
Free
Moving box estimator
Build a practical starting estimate for moving boxes from rooms, people and clutter level.
Free
Meal portion scaler
Scale ingredient quantities from an original recipe to the number of servings you need.
Free
Word counter
Count words, characters with and without spaces, sentences, paragraphs, lines, reading time and speaking time as you type.
Free
Case converter
Convert text to sentence, title, upper, lower, camel, Pascal, snake or kebab case.
Free
Line sorter
Sort, reverse, trim and tidy a list one line at a time.
Free
Duplicate line remover
Remove repeated lines while preserving the first occurrence and your original order.
Free
Reading time estimator
Estimate silent reading and speaking time from a text and adjustable words-per-minute rates.
Free
Headline length checker
Check headline characters and words against practical search, email and social ranges.
Free
Creative brief builder
Turn project facts into a structured, copy-ready creative or content brief.
Free
Text diff checker
Compare two versions of text and highlight additions, removals and unchanged lines.
Free
Priority matrix
Sort tasks into do, schedule, delegate and remove quadrants by urgency and importance.
Free
Pomodoro timer planner
Plan focus sessions, short breaks and long breaks for a block of work.
Free
Task time estimator
Combine optimistic, likely and cautious estimates into a more realistic task duration.
Free
Project milestone planner
Turn a project window and milestone list into a dated, copy-ready timeline.
Free
Date difference calculator
Count calendar days, weeks and weekdays between two dates.
Free
Deadline calculator
Add or subtract calendar or working days from a starting date.
Free
Working days calculator
Count weekdays between dates with optional inclusive counting and holiday dates.
Free
Event schedule builder
Build a timed event agenda or run sheet from activities, durations and optional changeover time.
Free
Service renewal tracker
Review renewal dates, costs and cancellation-notice deadlines in one sorted schedule.
Free
Shift length calculator
Work out paid shift duration after breaks, including overnight shifts.
Free
Countdown maker
Create a live day, hour, minute and second countdown to a chosen moment.
Free
Age calculator
Calculate calendar age, total days lived and time until the next birthday.
Free
Fuel cost calculator
Estimate fuel used, journey cost and cost per traveller from distance and efficiency.
Free
Mileage allowance calculator
Calculate a business mileage claim and compare it with the current HMRC approved car and van rates.
Free
Trip budget planner
Estimate a complete travel budget and cost per person from transport, accommodation and daily spending.
Free
Luggage weight splitter
Share a baggage weight allowance across bags and travellers and flag overages.
Free
Airport arrival planner
Work backwards from departure through boarding, security, check-in and travel time.
Free
Water intake calculator
Turn a general daily hydration target into manageable drinks and checkpoints.
Free
Sleep schedule planner
Work backwards from a wake time to several bedtime and wind-down options.
Free
Fitness pace calculator
Convert distance and duration into pace and average speed for walking, running or cycling.
Free
Mood check-in journal
Create a private, copy-ready mood check-in from a few gentle reflection prompts.
Free
Step goal planner
Build a gradual weekly walking-step target from a current average and chosen goal.
Free
Grade percentage calculator
Convert marks into a percentage and combine weighted assessment scores.
Free
Quiz score analyser
Combine several quiz results into an overall percentage, average and ranked breakdown.
Free
Reading speed checker
Calculate words per minute from a timed reading and estimate time for another text.
Free
Image aspect ratio calculator
Reduce a width and height to a ratio or calculate a matching missing dimension.
Free
File size estimator
Estimate audio or video file size from bitrate and duration.
Free
Colour contrast checker
Check foreground and background colours against WCAG contrast thresholds.
Free
Image compressor & resizer
Resize and compress JPEG, PNG or WebP images locally, then download the result.
Free
Unit converter
Convert length, mass, area, volume, temperature, speed, pressure, energy and data units.
Free
Discount calculator
Apply one or two sequential discounts and see the final price, saving and effective rate.
Free
Unit price calculator
Compare differently sized packs by price per item, gram, kilogram, millilitre or litre.
Free
Product comparison scorecard
Compare products with the same price, quality, feature and ease-of-use criteria.
Free
JSON formatter & validator
Validate, format, minify and recursively sort JSON entirely in your browser.
Free
Base64 encoder & decoder
Encode Unicode text to Base64 or decode Base64 and Base64URL safely.
Free
URL encoder & decoder
Encode or decode URL components and inspect malformed percent escapes clearly.
Free
JWT decoder
Decode JWT header and payload claims locally and inspect common time fields.
Free
Regex tester
Test a JavaScript regular expression, flags and replacement against sample text.
Free
Hash generator
Create SHA-256, SHA-384 or SHA-512 digests from text using Web Crypto.
Free
UUID v4 generator
Generate one or many cryptographically random UUID version 4 identifiers.
Free
Unix timestamp converter
Convert explicit seconds, milliseconds or microseconds to local, UTC and ISO dates.
Free
Slug generator
Turn a heading into a clean URL slug with separator and transliteration options.
Free
Secure password generator
Generate strong random passwords with selected character sets and an entropy estimate.
Free
Password strength checker
Review password length, character variety and obvious patterns without sending the password anywhere.
Free
Random number generator
Generate uniform random integers or decimals, with optional unique results.
Free
Video script timer
Estimate spoken video or voice-over length from script word count and delivery pace.
Free
Screen break scheduler
Generate a practical sequence of screen breaks across a working or study window.
Free
Risk register starter
Score a short list of risks by likelihood and impact, then sort the next review priorities.
Free
Meeting notes formatter
Turn prefixed rough notes into separate decisions, actions and general notes.
Free
Email subject comparer
Compare subject lines by character length, word count and a transparent clarity heuristic.
Free
Tutor session planner
Turn lesson goals and a session duration into a balanced teaching plan with review time.
Free
Course comparison scorecard
Compare courses on cost, duration, support and expected outcome using the same visible criteria.
Free
Recipe cost calculator
Calculate ingredient and batch cost, cost per serving and a target-margin selling price from pack prices and quantities used.
Free
Electricity cost calculator
Estimate appliance electricity use and running cost from power, usage time, duty cycle and tariff.
Free
ROI calculator
Calculate return on investment, net return and the value returned for each unit of cost.
Free
Customer acquisition cost calculator
Find blended customer acquisition cost from marketing and sales spend over a chosen period.
Free
Customer lifetime value calculator
Estimate revenue, gross-profit and net customer lifetime value with an LTV to CAC ratio.
Free
ROAS calculator
Measure return on ad spend and compare it with profit and ROI after additional costs.
Free
Cash runway calculator
Forecast how long a cash balance may last with monthly revenue, expenses and revenue growth.
Free
Revenue growth calculator
Compare starting and ending revenue with total growth, absolute change and compound growth per period.
Free
Sales commission calculator
Calculate commission above a threshold with an optional higher accelerator rate.
Free
Freelancer project quote calculator
Build a project quote from labour, direct costs, contingency, target margin and a tax buffer.
Free
Lead conversion calculator
Measure lead qualification, conversion, acquisition cost and revenue efficiency across a funnel.
Free
Product pricing calculator
Set a pre-tax and retail product price from unit cost, overhead, target margin and tax rate.
Free
UTM URL builder
Add consistent campaign tracking parameters to a landing-page URL without losing existing queries.
Free
Meta tag generator
Generate core title, description, canonical, robots and Open Graph tags with a snippet preview.
Free
Robots.txt builder
Draft a robots.txt group with allow, disallow, sitemap and optional crawl-delay directives.
Free
Hreflang tag generator
Build alternate-language link tags from language codes and canonical page URLs.
Free
Schema markup generator
Create a JSON-LD block for a Schema.org type with optional validated extra properties.
Free
Keyword density checker
Count exact keyword phrase uses, word share, first mention and frequent non-stop words.
Free
SERP snippet preview
Preview a search-result style title, description and URL with transparent length checks.
Free
Campaign budget splitter
Allocate a fixed marketing budget across weighted channels after respecting minimum amounts.
Free
Social post planner
Turn dated platform, topic and call-to-action lines into a sorted content calendar.
Free
Email campaign ROI calculator
Model expected opens, clicks, orders, revenue, profit and ROI from a sequential email funnel.
Free
CSV to JSON converter
Convert delimited tabular text into formatted JSON arrays or objects in your browser.
Free
JSON to CSV converter
Turn JSON arrays, objects or primitive values into spreadsheet-ready delimited text.
Free
HTML entity encoder & decoder
Encode reserved HTML characters or decode common named and numeric character entities.
Free
Number base converter
Convert exact whole numbers between bases 2 and 36, including binary, decimal and hexadecimal views.
Free
CSS clamp calculator
Generate a fluid CSS clamp() value between chosen sizes and viewport widths.
Free
Cron expression builder
Build and validate a common five-field cron expression with a plain-language summary.
Free
Markdown preview & HTML converter
Preview a focused Markdown subset and copy safely escaped HTML generated from it.
Free
Colour palette generator
Create a browser preview and CSS variables from a base colour, palette size and colour mode.
Free
Data URL generator
Turn text or a selected local file into a percent-encoded or Base64 data URL.
No exact match yet.
Try a category name or a simpler task word.