Home & DIY
tools and calculators.
33 practical tools with clear inputs and explanations. Choose a tool below, or explore a role-based toolbox for a collection that fits your day.
Shelf carcass panel cut list
List rectangular panels for a simple between-side shelf cabinet.
Paver grid and edge-cut plan
Preview a straight paver grid and export every full or edge-cut position.
Window blind measurement worksheet
Compare three opening measurements and apply a supplied deduction.
Moving box weight allocation
Group listed item units within your chosen box mass budget.
Pipe mean flow velocity
Find mean liquid speed from circular bore diameter and volume flow.
Darcy pipe friction loss
Estimate straight-pipe pressure loss using a flow-regime-aware Darcy factor.
Pipe fitting minor-loss table
Combine fitting loss coefficients on one velocity basis.
Battery energy runtime
Estimate constant-load runtime after supplied usable-depth and efficiency factors.
Battery series/parallel arithmetic
Compare nominal pack voltage, capacity, energy and cell current sharing.
Solar array energy budget
Estimate energy from array rating, equivalent peak-sun hours and supplied derating.
Layered wall heat flow
Combine material and surface-film resistances and inspect interface temperatures.
Room layout planner
Arrange furniture rectangles on a measured room plan, with snapping, keyboard controls and SVG export.
Evenly spaced objects
Lay out identical objects with equal edge gaps or fixed end clearances.
Board feet calculator
Calculate sawn-lumber volume and a price estimate from board dimensions.
Picture hanging layout
Position a centred picture and one or two aligned hanging points.
Equal mitre angle calculator
Find matching mitre cuts for a flat corner or a regular polygon frame.
Paint calculator
Estimate wall paint, coverage and cost for a rectangular room.
Wallpaper calculator
Estimate whole rolls with drop length and pattern-repeat allowances.
Flooring pack calculator
Work out floor area, whole packs and estimated material cost.
Tile quantity calculator
Estimate tiles and whole boxes from area and tile dimensions.
Concrete volume calculator
Estimate concrete volume and bags using the stated bag yield.
Stair layout calculator
Explore riser count, tread count and straight stair run.
Room area planner
Add up multiple rooms and compare square metres with square feet.
Material cost calculator
Estimate quantities, delivery, tax and a project material total.
Fence post calculator
Count posts and estimate actual equal spacing for a straight fence.
Decking board calculator
Estimate whole boards across a rectangular deck.
Gravel volume & mass calculator
Estimate loose aggregate volume, mass and whole bags.
Brick quantity estimator
Estimate rectangular wall bricks with mortar joints and openings.
Roof pitch calculator
Translate rise and horizontal run into an angle and rafter length.
Slope & gradient calculator
Compare gradient percentage, angle and rise-to-run ratio.
Appliance electricity cost
Estimate energy and cost from power, usage and your tariff.
Electricity bill estimator
Combine meter usage, unit price and a daily standing charge.
Two-stroke fuel mix calculator
Work out oil and petrol quantities for a ratio you supply.