DIY Calculator Toolbox – Online Tools for Off-Grid, Electrical & Building Projects
This DIY calculator toolbox gives you quick access to accurate, web-based tools for wire sizing, roof and pipe slopes, off-grid system design and simple counting tasks. Use it as a central hub: bookmark the page, or save it to your home screen, and you always have your key calculators one tap away.
Click or tap the chest to reveal all calculators.
DC Wire Gauge Calculator
ElectricalCalculate correct DC cable sizes for 12V, 24V and 48V systems. Ideal for solar setups, vans, boats and other low-voltage projects where voltage drop matters.
- • Outputs mm² plus AWG / SWG equivalents
- • Uses cable length, power or current as inputs
- • Helps avoid undersized or overheating cables
Universal Slope Calculator
Slope & PitchConvert roof pitch, pipe fall and gradients in seconds. Use it for roofing, drainage, plumbing runs and landscaping where correct slopes are critical.
- • Slope percentage, angle and rise-over-run
- • Supports metric and imperial units
- • Handy for quick on-site checks on your phone
Off-Grid Power Calculator
Off-GridSize complete off-grid systems, including daily energy use, battery capacity and optional solar input. Suitable for RVs, boats, cabins and tiny homes.
- • Daily Wh and Ah estimates based on your loads
- • Supports LiFePO4, lithium and lead-acid batteries
- • Works with 12V, 24V, 48V and custom system voltages
Online Counter Tool
UtilityA simple online counter for counting repetitions, parts, steps or any other recurring task while you work on DIY or technical projects.
- • Tap or click to increment and decrement
- • Works well on desktop and mobile browsers
- • Useful for stock, reps, components or time-based tasks