DIY Tools
Project Calculators
Quick estimates for the maths every DIY project hides — concrete, tile, square footage, conversions and more. Free, no sign-up, ready before you mix your first bag.
Pick Your Tool
Each calculator opens in its own page, runs entirely in your browser, and remembers nothing about you. Use them as often as you like.
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Concrete Calculator
Estimate cubic yards for slabs, footings and columns. Punch in your dimensions and get an order-ready number in seconds.
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Square Footage Calculator
Measure rooms, decks or yards in square feet. Perfect for flooring, paint, sod and material estimates.
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Tile Calculator
Count tiles needed for any floor or wall with a 10 % waste margin so you never run short on grout day.
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Roman Numeral Converter
Translate numbers to Roman numerals and back. Handy for signs, monograms, anniversaries and craft projects.
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Unit Conversion Calculator
Convert between metric and imperial units — length, weight, volume and temperature — without leaving the build.
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Shoe Size Conversion
Switch between US, UK, EU and Asia sizing in one tap. Useful for handmade footwear, gifts and pattern fitting.
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Bra Size Calculator
Find the right band and cup based on simple measurements. A starting point for sewing, lingerie DIY and altering thrifted pieces.
Open tool →Why Every Maker Needs a Calculator
DIY rewards two habits — patience and planning. The patience part you bring yourself. The planning part is exactly what these tools do for you.
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Measure twice, buy once
Most DIY budgets blow up at the checkout, not the workbench. Run every estimate through a calculator before you load the cart — it costs nothing to double-check and saves a trip back to the hardware store.
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Always plan for waste
Tile breaks. Concrete spills. Wood splits at the wrong knot. Every pro adds 5 – 15 % to material counts on purpose. Our calculators bake in a sane waste margin so your first build still ends with finished edges.
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Mind your units
A bag of concrete in the US is not the same as one in Australia. Wood thickness in millimetres reads differently in inches. A 30-second conversion check beats redoing a whole panel because the math drifted halfway through.
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Make the maths invisible
These tools exist so you spend your weekend cutting, mixing and finishing — not on a spreadsheet. Bookmark the page, plug numbers in as you go, and keep your attention on the part of DIY that actually feels good: building the thing.
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Got a project lined up?
Pair these calculators with our step-by-step DIY guides and you have everything you need to plan, source and finish a build in one weekend.