Practical Guides
In-depth how-to articles that sit alongside the free tools: pricing and invoicing, property and finance, working with image, video, and PDF files, barcodes and QR codes, and more. 47 guides and growing.
Business
10 guidesBusiness
Break-Even Analysis: Formula, Examples, and What It Means for Your Business
Break-even analysis tells you exactly how many units you must sell - or how much revenue you must generate - before you start making a profit. Here is how it works and how to use it.
Read guide ->
Business
Markup vs Margin: What Is the Difference and Which Should You Use?
Markup and margin both measure profit - but they use different denominators and give very different percentages. Confusing the two is one of the most common and costly pricing mistakes.
Read guide ->
Business
How to Write an Invoice: What to Include and Common Mistakes to Avoid
A professional invoice gets you paid faster and protects you if a dispute arises. Here is exactly what to include, how to handle tax, and the most common invoicing mistakes.
Read guide ->
Business
How to Write a Business Quote That Gets Accepted
A well-written quote wins the job and protects you if the scope changes. Here is exactly what to include, how to price confidently, and the mistakes that make clients choose someone else.
Read guide ->
Business
What Is a Purchase Order and When Do You Need One?
A purchase order is a formal document that authorises a purchase and creates a legal record before goods or services are delivered. Here is when to use one and what it must include.
Read guide ->
Business
How to Write a Statement of Work: The 8 Sections You Need
A statement of work defines exactly what will be delivered, by when, and at what cost. Without one, scope creep is inevitable. Here are the eight sections every SOW needs.
Read guide ->
Business
What Is an NDA and When Do You Need One?
An NDA (non-disclosure agreement) is a legally binding contract that protects confidential information. Learn when you need one, what it should include, and the difference between mutual and one-way NDAs.
Read guide ->
Business
How to Write a Privacy Policy for Your Website
Learn what a privacy policy must include, why every website legally needs one, and how to write one that covers GDPR, CCPA, cookies, and third-party services - without a lawyer.
Read guide ->
Business
GDPR Compliance Checklist for Small Businesses
A plain-English GDPR compliance checklist for small business owners and freelancers. Covers privacy policies, consent, data subject rights, cookies, data breaches, and third-party processors.
Read guide ->
Business
Freelancer Contract Checklist: What to Have Signed Before You Start
The three documents every freelancer needs before starting a project: an NDA, a statement of work, and a clear invoicing process. What each should include and common mistakes to avoid.
Read guide ->
Finance
10 guidesFinance
How to Price a Product: The Formula Every Seller Needs
Most sellers undercharge because they miss hidden costs. Here is the pricing formula that accounts for every cost - and how to work backwards from your target margin.
Read guide ->
Finance
VAT vs Sales Tax: What Is the Difference and Which Applies to You?
VAT and sales tax both add a percentage to the price of goods and services - but they work completely differently. Here is how each system works, which countries use which, and what it means for your business.
Read guide ->
Finance
How to Calculate Monthly Loan Repayments (and What the Formula Actually Means)
The monthly loan repayment formula looks complex but follows a clear logic. Here is how it works, what changes your payment the most, and how to compare loans properly.
Read guide ->
Finance
How to Calculate Percentages (The 3 Types People Actually Need)
Percent of a number, what percent one number is of another, and percentage change. Three formulas cover almost every real percentage question. Here is each one with worked examples.
Read guide ->
Finance
How Compound Interest Works (And Why Time Matters More Than Rate)
Compound interest pays interest on your interest, so balances grow faster the longer they run. Here is the formula, a worked example, and why starting early beats a higher rate.
Read guide ->
Finance
How to Set Your Freelance Rate (So You Actually Take Home Enough)
Your freelance rate is not your old salary divided by 2,080 hours. Here is how to work backwards from the income you need, accounting for unpaid time, expenses, and billable utilisation.
Read guide ->
Finance
How to Calculate the Real Cost of a Meeting
A one-hour meeting with eight people can cost more than you think once you account for salaries and overhead. Here is how to put a number on it, and why it changes how you run meetings.
Read guide ->
Finance
How to Calculate Cash Runway and Burn Rate
Runway is how many months your business can survive before the cash runs out. Here is how to calculate burn rate and runway, and what to do when the number gets short.
Read guide ->
Finance
How to Calculate a Discount and Sale Price
Work out the sale price after a percent off, the amount you save, and how to reverse it to find the original price. Plain formulas with worked examples.
Read guide ->
Finance
How Loan Amortization Works
Amortization is how a loan is paid off in equal instalments, with each payment split between interest and principal. Here is how the split changes over time and why early payments are mostly interest.
Read guide ->
Work
2 guidesWork
How to Convert an Hourly Rate to an Annual Salary (and Back)
Convert an hourly wage to a yearly salary, and a salary back to an hourly rate, including the effect of unpaid time off. Plain formulas and a worked example.
Read guide ->
Work
How Overtime Pay Is Calculated
Overtime is usually paid at 1.5x your normal rate for hours above a weekly threshold. Here is how the calculation works, with a worked example and the common mistakes.
Read guide ->
Property
5 guidesProperty
How to Calculate Rental Yield (Gross and Net)
Gross yield tells you how a rental property looks on paper. Net yield tells you how it actually performs. Here is how to calculate both, and why the difference matters.
Read guide ->
Property
Rent vs Buy: How to Run the Numbers
The rent vs buy decision is more complex than comparing a mortgage payment to rent. Here is the complete financial framework - with worked examples.
Read guide ->
Property
House Flipping Profit: How to Calculate Your Real Return
Most flippers calculate profit as selling price minus purchase price and renovation costs. The professionals include every cost - and that is why they consistently make money while beginners do not.
Read guide ->
Property
How Much Mortgage Can I Afford? Affordability Rules and Real Calculations
Lenders use specific income multiples and stress tests to decide how much to lend. Here is how affordability is calculated, what deposit you need, and the hidden costs buyers miss.
Read guide ->
Property
How to Calculate Your Airbnb Profit (The Numbers Most Hosts Get Wrong)
Most Airbnb hosts overestimate income and underestimate costs. Here is a complete cost breakdown, how to estimate occupancy realistically, and how short-term rental compares to a long-term tenancy.
Read guide ->
Restaurant
2 guidesRestaurant
How to Calculate Food Cost Percentage (and Why It Matters)
Food cost percentage is the single most important number in a restaurant's finances. Here is the formula, what the target should be, and how to reduce it without cutting quality.
Read guide ->
Restaurant
How to Price a Restaurant Menu Item: Two Methods That Actually Work
Menu pricing is not guesswork. There are two reliable methods - food cost pricing and contribution margin pricing - and the best restaurants use both together. Here is how.
Read guide ->
Image
9 guidesImage
Social Media Image Sizes: The Complete 2026 Guide
Every platform uses different dimensions. Use the wrong size and your image gets cropped, blurred, or rejected. Here are the correct sizes for every major platform in 2026.
Read guide ->
Image
Amazon Product Image Requirements: What You Need to Know in 2026
Amazon has strict rules about product images - the wrong image gets your listing suppressed. Here are the current requirements for main images and additional images.
Read guide ->
Image
How to Remove EXIF Data from Photos (and Why You Should)
Every photo taken on a smartphone contains hidden metadata including your GPS location. Here is what EXIF data is, what it reveals, and how to remove it before sharing photos online.
Read guide ->
Image
What Is a Favicon? Sizes, Formats, and How to Add One to Your Website
A favicon is the small icon that appears in browser tabs, bookmarks, and search results. Here is every size you need, the correct HTML to add it, and why yours might look blurry.
Read guide ->
Image
How to Remove an Image Background for Free Without Uploading
Most background removers send your photo to their servers. Here is how to remove a background and get a transparent PNG entirely on your own device, for free, with no signup.
Read guide ->
Image
Are Online File Tools Safe? Tools That Don't Upload Your Files
Most online converters and editors upload your file to their servers. A growing class of tools do all the work in your browser instead. Here is how to tell the difference and which tasks can be done privately.
Read guide ->
Image
How to Convert HEIC to JPG (iPhone Photos)
Your iPhone saves photos as HEIC, and half the web will not open them. Here is what HEIC is, why it trips up Windows and older apps, and how to convert to JPG without uploading your photos.
Read guide ->
Image
How to Compress an Image Without Losing Quality
Big images slow down websites and blow past upload limits. Here is how image compression works, the difference between lossy and lossless, and how to shrink a photo without a visible drop in quality.
Read guide ->
Image
How to Blur or Redact Sensitive Info in a Photo
Before you post a screenshot or photo, hide the faces, addresses, and account numbers in it. Here is how to redact an image properly so the hidden information cannot be recovered.
Read guide ->
Marketing
3 guidesMarketing
EAN-13 vs UPC-A: Which Barcode Does Your Product Need?
EAN-13 and UPC-A are the two dominant retail barcode formats. Most modern scanners read both, but which one you register and print depends on where your product is sold.
Read guide ->
Marketing
How to Create a WiFi QR Code (So Guests Scan to Connect)
A WiFi QR code lets guests join your network by scanning, no password typing. Here is how they work, how to make one, and where to put it.
Read guide ->
Marketing
How to Make a QR Code (Free, and Which Type to Use)
QR codes link the physical world to a web page, a contact card, or a WiFi network. Here is how to make one, the difference between static and dynamic codes, and how to make sure it actually scans.
Read guide ->
Converters
6 guidesConverters
MP3 vs WAV vs FLAC: Which Audio Format Should You Use?
MP3, WAV, and FLAC solve different problems. One is small, one is a raw editing format, one is lossless but compressed. Here is when to use each.
Read guide ->
Converters
How to Convert Audio Formats (Without Uploading Your Files)
Convert MP3, WAV, M4A, OGG, and FLAC in your browser with no upload. Which output and settings to pick, and how to avoid quality loss.
Read guide ->
Converters
How to Get GPS Coordinates from a Google Maps Link
Every Google Maps link already contains the latitude and longitude. Here is how to read them from the URL, on desktop and mobile, and get them in decimal or DMS format.
Read guide ->
Converters
How to Compress a Video Without Losing Much Quality
Videos are the biggest files most people share, and email, WhatsApp, and upload forms all have limits. Here is how video compression works and how to shrink a video in your browser without uploading it.
Read guide ->
Converters
How to Convert a Video to a GIF
GIFs autoplay, loop, and paste anywhere without a player. Here is when a GIF beats a video, how to turn a clip into one, and how to keep the file small enough to actually share.
Read guide ->
Converters
How to Merge PDF Files (Free, in Your Browser)
Combining separate PDFs into one file makes documents easier to send, sign, and file. Here is how to merge PDFs, reorder the pages, and do it without uploading confidential documents.
Read guide ->