Free
ROI calculator
Calculate return on investment, net return and the value returned for each unit of cost.
The useful corner of the internet
Free online tools. Zero fuss.
Calculate, convert, write, inspect and create with 121 focused tools that work directly in your browser—no account, no downloads and no data detour.
/
- Private by default
- Works on mobile
- 121 public tools free
New
Search the complete library from every page, save useful tools locally and reuse twenty maintained publisher embeds.
Browse the embedsChoose a lane
Tools organised around real tasks.
Start with what you are trying to finish. Every category connects related calculators and helpers, so the next useful step is always close.
Money & business
Clear calculators for VAT, pricing, interest, borrowing, savings and everyday business decisions.
Marketing & growth
Measure campaigns, model customer economics and prepare practical SEO and marketing assets.
Home & lifestyle
Plan decorating, household costs, meals, moves and measurements with less guesswork.
Writing & content
Count, clean, compare and transform text for clearer writing and faster publishing.
Work & productivity
Simple planning tools for focus blocks, priorities, meeting costs and realistic estimates.
Dates & time
Calculate date gaps, deadlines, working days, ages, shifts, countdowns and timestamps.
Travel & transport
Estimate fuel, mileage, luggage and journey timings before you set off.
Health & wellbeing
Gentle planning helpers for sleep, hydration, movement and everyday routines.
Learning & education
Check grades and reading pace, then turn results into realistic study plans.
Digital & media
Resize images, check contrast, estimate files and convert common units locally.
Shopping & decisions
Compare unit prices and stacked discounts before spending.
Developer tools
Format, encode, decode, test and inspect common development data without sending it away.
Data & file tools
Convert structured data, build reusable code snippets and prepare small files in your browser.
Security & privacy
Generate strong passwords and random values, and assess password structure locally.
Start here
Popular problems, solved quickly.
22 useful starting points. Use the complete search above or open the full library to see everything.
Free
VAT calculator
Add or remove VAT and see the net, tax and gross amounts instantly.
Free
Mortgage affordability calculator
Estimate a headline mortgage loan, affordable property price and monthly payment from your income and deposit.
Free
Word counter
Count words, characters with and without spaces, sentences, paragraphs, lines, reading time and speaking time as you type.
Free
Image compressor & resizer
Resize and compress JPEG, PNG or WebP images locally, then download the result.
Free
UTM URL builder
Add consistent campaign tracking parameters to a landing-page URL without losing existing queries.
Free
CSV to JSON converter
Convert delimited tabular text into formatted JSON arrays or objects in your browser.
Free
BMI calculator
Calculate body mass index and a healthy weight range from weight and height.
Free
Tile calculator
Estimate the tiles, boxes and material cost for a floor from room and tile dimensions.
Free
Profit margin calculator
Calculate gross profit, profit margin, markup and the cost ratio from a selling price.
Free
Meta tag generator
Generate core title, description, canonical, robots and Open Graph tags with a snippet preview.
Free
Schema markup generator
Create a JSON-LD block for a Schema.org type with optional validated extra properties.
Free
Date difference calculator
Count calendar days, weeks and weekdays between two dates.
Free
Time zone converter
Convert a date and time between fixed UTC offsets with a clear difference label.
Free
Event run sheet builder
Build a timed event agenda or run sheet with changeovers, then save it as text, CSV or an iCalendar file.
Free
Trip budget planner
Estimate a complete travel budget and cost per person from transport, accommodation and daily spending.
Free
Quiz score analyser
Combine several quiz results into an overall percentage, average and ranked breakdown.
Free
Product comparison scorecard
Compare products with the same price, quality, feature and ease-of-use criteria.
Free
Tip calculator
Work out a tip, total and fair per-person split for a restaurant or service bill.
Free
Creative brief builder
Turn project facts into a structured, copy-ready creative or content brief.
Free
Unit converter
Convert length, mass, area, volume, temperature, speed, pressure, energy and data units.
Free
Secure password generator
Generate strong random passwords with selected character sets and an entropy estimate.
Fresh from the bench
New tools, tested and live.
Twelve focused calculators joined the library. Each runs locally, stays free to use daily and follows the same transparent method notes as the rest of the collection.
Free
Mortgage affordability calculator
Estimate a headline mortgage loan, affordable property price and monthly payment from your income and deposit.
Free
Holiday entitlement calculator
Calculate annual leave days from your working week, leave weeks and a part-year start.
Free
Fuel economy converter
Convert between UK MPG, US MPG, litres per 100 km and kilometres per litre.
Free
Time zone converter
Convert a date and time between fixed UTC offsets with a clear difference label.
Free
BMI calculator
Calculate body mass index and a healthy weight range from weight and height.
Free
Tile calculator
Estimate the tiles, boxes and material cost for a floor from room and tile dimensions.
Free
Tip calculator
Work out a tip, total and fair per-person split for a restaurant or service bill.
Free
Concrete calculator
Estimate concrete volume and bags for a slab, path or pad from length, width and depth.
Free
Percentage difference calculator
Compare two values with a symmetric percentage difference and absolute difference.
Free
Calories burned calculator
Estimate calories burned for an activity from weight, duration and a MET value.
Free
Weekly work hours calculator
Total weekly work hours from shift start, end and break times, including overnight shifts.
Free
Mortgage overpayment calculator
Estimate how a regular monthly overpayment shortens a mortgage and reduces total interest.
Your private shortcuts
Pick up where you left off.
Saved and recent tools stay only in this browser. UtilHub never receives this list.
Saved tools
Recently opened
Understand the answer
Worked examples for real decisions.
Savings planning guide
Plan a realistic savings goal
Work backwards from a savings target and deadline, understand the monthly and weekly calculation, and test whether your current plan is on track.
Deadline calculation guide
Calculate working-day deadlines correctly
Count working days from a start date, apply UK bank holidays by region, and download the maintained dates as CSV or JSON.
UK fuel-cost guide
Calculate a UK journey fuel cost
Convert UK MPG or litres per 100 km into journey fuel use, total cost, cost per mile and a per-traveller estimate.
Your work stays yours.
Browser-first
Calculations and text processing happen on your device.
No sign-up
Open a tool, get the answer and keep moving.
Transparent
Methods, examples and limitations sit beside every tool.
Go beyond one-off answers
20 deeper workflows for repeat work.
Forecast, audit and compare business, marketing, customer, data and SEO work in one advanced suite. Try 1 Premium run as a guest or create a free account for 3 per rolling 24 hours.
3 → 10public runs per rolling 24 hours
1 → 3Premium runs per rolling 24 hours
£9/mounlimited tool use