Exact conversions, with the working shown.
Converters and calculators for screen, print and everyday measurements: pixels at any DPI, rem and points, kilograms, gallons, degrees and time zones. Decimal-exact, with every assumption in view.
Length
All length| Converter | Units | Typical use |
|---|---|---|
| Pixels to Centimeters | px → cm | Print size of an image or layout |
| Centimeters to Pixels | cm → px | Pixel size needed for a print job |
| Pixels to Millimeters | px → mm | Physical size of pixels in print or CSS |
| Millimeters to Pixels | mm → px | Canvas size for metric print specs and bleed |
| Pixels to Inches | px → in | How large an image prints, in inches |
| Inches to Pixels | in → px | Canvas size for US print sizes |
| Centimeters to Inches | cm → in | Screens, clothing and product sizes |
| Inches to Centimeters | in → cm | US product and body measurements |
| Feet to Meters | ft → m | Heights, rooms and building plans |
| Meters to Feet | m → ft | Room sizes, ceilings and altitude |
| Kilometers to Miles | km → mi | Runs, road distances and travel |
| Miles to Kilometers | mi → km | Driving distances and race lengths |
| Millimeters to Inches | mm → in | Tools, fasteners and small parts |
| Inches to Millimeters | in → mm | Drill bits, pipes and fasteners |
| Yards to Meters | yd → m | Fabric, sports fields and golf |
| Meters to Yards | m → yd | Fabric and sports distances |
Typography
All typography| Converter | Units | Typical use |
|---|---|---|
| Pixels to REM | px → rem | Design sizes to accessible CSS |
| REM to Pixels | rem → px | Reading design tokens and CSS |
| Pixels to Points | px → pt | Screen type sizes for documents and PDF |
| Points to Pixels | pt → px | Brand guide and Word sizes for the web |
| Points to Millimeters | pt → mm | Physical size of type and rules |
| Millimeters to Points | mm → pt | Metric specs in InDesign and Illustrator |
| Pixels to EM | px → em | Component sizes relative to their parent |
| EM to Pixels | em → px | Rendered size of nested em values |
| Pixels to VW | px → vw | Fluid type and layout from a mockup |
| VW to Pixels | vw → px | What a vw value renders at on a device |
| Picas to Points | pc → pt | Column widths from print layouts |
| Picas to Inches | pc → in | Picas in grid and column specs |
| Points to Centimeters | pt → cm | Type and rule sizes in metric |
| Centimeters to Points | cm → pt | Metric margins in point-based apps |
| Points to Inches | pt → in | Type and rules in US print specs |
| Inches to Points | in → pt | Margins, bleed and PDF page sizes |
Design calculators
All calculators| Calculator | Typical use |
|---|---|
| Aspect Ratio Calculator | Crops, video sizes and resizing |
| Image Print Size Calculator | How big a photo can print sharply |
| Screen PPI Calculator | Comparing monitors and phone screens |
| Paper Size Calculator | A4, Letter and more in mm, in and px |
| Font Size Converter | One type size in px, rem, pt and mm |
| Line Height Calculator | Leading for readable body text |
| Calculator | Typical use |
|---|---|
| Image Resize Calculator | New dimensions at the same ratio |
| DPI / PPI Calculator | Pixels, print size and DPI |
| Screen Size Calculator | Width and height from a diagonal |
| Megapixels to Print Size | How large a camera file prints |
| Video File Size Calculator | Storage for footage and exports |
Everyday units
All converters- Weight9 tools
- Volume13 tools
- Temperature5 tools
- Area7 tools
- Speed
mph to km/hkm/h to mphkn to km/h
5 tools - Time
h to minTime Zone ConverterUnix Timestamp Converter
3 tools - Energy3 tools
- Power4 tools
- Pressure
psi to barbar to psikPa to psi
4 tools - Fuel economy
mpg to L/100 kmL/100 km to mpg
2 tools - Data storage7 tools
- Data transfer
Mbps to MB/sMB/s to MbpsDownload Time Calculator
3 tools
Everyday calculators
All calculators| Calculator | Typical use |
|---|---|
| Feet and Inches to CM | Height for forms and records |
| CM to Feet and Inches | Metric height in US and UK terms |
| Cups to Grams | Baking by weight from US recipes |
| Oven Temperature Converter | Gas mark, °C, °F and fan ovens |
| Calculator | Typical use |
|---|---|
| Pace Converter | Running pace per km and per mile |
| Time Zone Converter | Meetings and calls across zones |
| Unix Timestamp Converter | Logs, APIs and databases |
| Download Time Calculator | How long a download takes |
Garden and yard
All calculators| Calculator | Typical use |
|---|---|
| Mulch Calculator | Cubic yards and bags for beds |
| Topsoil Calculator | Soil for lawns, beds and leveling |
| Gravel Calculator | Paths and driveways, in yards and tons |
| Calculator | Typical use |
|---|---|
| Raised Bed Soil Calculator | Filling raised beds, in bags |
| Plant Spacing Calculator | How many plants fill a bed |
| Fertilizer Calculator | Product to spread for a nitrogen rate |
Guides
All guides- DPI vs PPI: which number the printer actually wants
Two acronyms, one confusion. What each number measures, which one decides how big and how sharp a print comes out, and why changing it in an editor often does nothing at all.
- Mbps vs MB/s: why your download is slower than your plan
A lowercase b and an uppercase B are a factor of eight apart. Add a little network overhead and you have the gap between the speed you pay for and the number on your screen.
- px, rem and em in CSS: when to use each
Three length units, three different reference points. What each one is measured against, how they behave when a reader changes their font size, and a simple rule for choosing.
- US vs UK measurements: gallons, pints, cups and tons
The same names, different sizes. Where American and British units part ways, by how much, and which one a recipe, a fuel figure or a shipping quote is likely to mean.
- Why a 1 TB drive shows 931 GB
Nothing is missing. The box and the computer are counting bytes with two different rulers, and only one of them is labeled honestly.