Conversions, Calculators and Practical Guides
Plan the project. Check the numbers. Get it right the first time.
CovertItAll is built around practical hubs for makers and DIYers: 3D printing, electronics, EV and energy, solar, and electrical work. Each hub gathers the guides, reference charts and decision tools for one kind of job, from prepping a long print and sizing a workshop circuit to planning a home solar array or an EV charge. The unit converters and calculators are part of that picture, the quick step you reach for mid-task, and every result still shows the formula and a reference table so you can check the number before acting on it.
- Hubs that gather the guides, charts and tools for one kind of project
- Converters that show the formula, a worked example and a reference table
- Written and checked by Rick Oosterling, a maker and developer
Smart convert
Why CovertItAll
The site is organised into hubs, not just a list of converters. A conversion is usually one step in a bigger job: you are ordering a part, following a recipe, prepping a print or reading a spec sheet, and the number only matters because of what you do with it next. Each hub keeps the guides, charts and tools for that job in one place, so the converter is the quick step rather than the whole reason to visit.
Mixing metric and imperial halfway through a task, or carrying a rounded figure into a formula that needs precision, is where things go sideways. Every tool shows the answer with short context and links to the related converters and guides most likely to follow.
There is no account to create. The converter sits at the top of every page, works the same on phone and desktop, and the explanation after it stays specific to that unit. Every tool and guide was written and checked by Rick Oosterling, a maker and developer who uses these tools on real projects.
Choose your starting point
I need a quick conversion
Switch units in one step, from length and weight to data, speed and temperature.
Browse converters →I need a practical calculator
Work out cost, VAT, energy use and salary, beyond a single unit swap.
Open calculators →I want a guide or explanation
Read short, practical guides that explain the units behind a real task.
Read the blog →Popular tools
Practical hubs
Each hub pulls together the converters, calculators and guides needed for one kind of job, not just a single unit swap.
Technical clusters
3D printing
Plan filament, nozzle choice and slicer settings before a long print.
EV & energy
Estimate charging time, range and running cost before a trip or purchase.
Electronics
Size resistors, check circuits and work through bench calculations.
Solar
Size panels, batteries and off-grid systems for a solar setup.
Electrical
Wire gauge, voltage drop, conduit fill and circuit planning.
Web & color
RGB, HEX and HSL color codes for web and design work.
Code & text
ASCII tables, text tools and encoding references for developers.
Converters & calculators by topic
Length & size
Metric and imperial lengths for any measurement task.
Weight & shipping
Kilograms, pounds and grams for luggage, parcels and body weight.
Temperature
Celsius, Fahrenheit and Kelvin for weather, cooking and science.
Volume & liquid
Liters, gallons, cups and milliliters for recipes and tanks.
Area
Square meters, feet and acres for rooms, land and plans.
Speed
km/h, mph, knots and m/s for travel and sport.
Pressure
bar, PSI and kPa for tyres, compressors and gauges.
Data & storage
Make sense of file sizes, drive capacity and transfer speeds.
Health
BMI, ideal weight, calories and hydration estimates.
Science
Energy, frequency, angle and other scientific units.
Media & display
Resolution, aspect ratio, DPI and file size for media.
Travel
Convert currency, distance, temperature and luggage limits abroad.
Everyday
Cooking, shopping and household conversions, metric and US.
Finance & cost
Work out VAT, discounts, energy cost and salary figures.
Fun calculators
Lighthearted everyday calculators for quick what-ifs.
Printable cheat sheets
One-page reference cards for the bench, workshop, kitchen or glove box. Open one, print it or save as PDF.
🔌 Resistor Color Code
4-band, 5-band and 6-band resistor decoding at a glance.
🖨️ Materials Comparison Chart 2026
PLA, PETG, ABS and more compared side by side, with a free PDF.
🍳 Kitchen Measurements
Cups, tablespoons, metric weights and volume at a glance.
⚡ EV Charging Reference
Charging levels, connector types and speeds in one card.
In-depth guides
Longer reads for when a single number is not the whole answer.
Home EV charging
Cable types, charging speed, cost and setup before you install.
3D printing materials compared
How PLA, PETG, ABS and TPU differ, and which to pick in 2026.
Choosing a nozzle size
When 0.4, 0.6 or 0.8 mm makes sense, and the trade-offs.
Storage units explained
Why drive sizes and download speeds rarely match the label.
Need one number? Use the converter. Need to finish the job? Follow the related tools and guides on each page.