DIY Calculator Toolbox
This DIY calculator toolbox brings all your essential tools together in one simple place. Because everything is grouped here, you can work faster and avoid searching for the same calculators again. As a result, it is easy to use, quick to open and built for real projects at home, on the road or on-site.
It’s ideal for builders, van converters, boat owners, off-grid users and anyone who prefers practical numbers over guesswork.
Available Calculators in This DIY Calculator Toolbox
Below you’ll find all calculators currently included in this DIY calculator toolbox. Each tool is simple to use and gives clear results. In addition, the layout is clean and the output is easy to read, so you can start your projects with confidence and make accurate decisions without wasting time.
DC Wire Gauge Calculator – DIY Electrical Calculator
Electrical
This DIY calculator helps you quickly determine the correct DC wire size for low-voltage systems. It is ideal for solar setups, campers, boats and any 12V, 24V or 48V configuration where voltage drop matters.
- • Calculates minimum cable size in mm²
- • Shows AWG and SWG equivalents
- • Uses length, voltage drop, power or current as inputs
- • Helps prevent overheating and power loss
Universal Slope Calculator – DIY Slope & Pitch Calculator
Slope & Pitch
This DIY calculator lets you convert between slope, angle, roof pitch and pipe fall in seconds. It is designed for roofing, drainage, plumbing runs and landscaping where gradients must be correct.
- • Roof pitch from span and rise/drop
- • Slope % ↔ degrees ↔ rise over run
- • Works for pipe fall and drainage gradients
- • Supports both metric and imperial units
Off Grid Power Calculator – DIY Off-Grid Calculator
Off-Grid
This DIY calculator helps you design your complete off-grid electrical system. You can size your battery bank, choose the right system voltage and optionally add solar so you stay fully autonomous.
- • Calculates daily energy use (Wh/day)
- • Recommends battery capacity in Wh and Ah
- • Supports LiFePO4, lithium and lead-acid batteries
- • Works with 12V, 24V, 48V and custom systems
- • Optional solar sizing for full autonomy
- • Ideal for RVs, boats, cabins and tiny homes
Why Bookmark This DIY Calculator Toolbox
When you bookmark this page, you always have quick access to the calculators you use most. Because everything is in one location, you no longer need to jump between different websites. In addition, every tool is fast, distraction-free and works smoothly on any device.
- • Clear and simple calculators without clutter
- • Mobile-friendly layouts for easy on-site use
- • Works consistently on phones, tablets and desktops
If you need extra reference information, you can also visit
Engineering Toolbox
.
This external resource offers charts and explanations for anyone who wants more background. However, the focus of this DIY calculator toolbox is on quick, practical answers.
Bookmark it once, and your calculators will always be just a click away.
Save This DIY Calculator Toolbox as a Web App
You can also add this DIY calculator toolbox to your home screen. This makes it work almost like a small app, which is especially useful when you are working outside or on location. With just one tap, the calculators open immediately.
On iPhone (Safari)
- Open this page in Safari
- Tap the Share icon
- Select “Add to Home Screen”
- Name it DIY Tools
On Android (Chrome)
- Open this page in Chrome
- Tap the ⋮ menu
- Select “Add to Home screen” or “Install app”
- Confirm
On Desktop
- Bookmark this page in your browser
- Pin it to your bookmarks bar for quick access