Every calculator in Chippy Tools
A construction calculator app for concrete, stairs, decking and set-out. Metric or imperial, and every calculator works offline.
Concrete & groundwork
Stairs & framing
Decking & outdoor
Pick the job, not the formula. Each calculator above takes the measurements you already have on the tape and returns the number you're about to act on — volume to order, riser height to mark, spacing that lands evenly on both ends.
Chippy Tools started as a set of calculators one carpenter kept re-deriving on the back of a timber offcut. It’s now a full set of them, in one app, built around the way a job actually runs rather than the way a maths textbook is organised.
Each calculator asks for the measurements you already have on the tape and gives back the number you’re about to act on — cubic metres to order, riser height to mark out, picket spacing that lands evenly on both ends. There’s no unit conversion step, no formula to remember, and no working out whether the answer came back in the units you asked for.
Everything runs on the device. That means the calculators are quick, they don’t hesitate on a bad connection, and they keep working when there’s no connection at all. Pick a calculator from the list above to see what it handles, the formula behind it, and worked examples in both metric and imperial.
Try Chippy Tools
Download Chippy Tools and start calculating in seconds. Works offline, supports metric and imperial.
Construction calculator questions
Can't find what you need? Contact us and we'll point you at the right tool.
- What is a construction calculator app?
- A construction calculator app replaces the tape, notepad and phone calculator you'd otherwise juggle on site. Instead of remembering a formula, you pick the job — a slab, a flight of stairs, a deck — enter the measurements you already have, and get the quantity, spacing or cut list you need. Chippy Tools bundles these calculators into one app so you're not hunting for a different tool every time the job changes.
- What calculators are in Chippy Tools?
- They're grouped into concrete and groundwork, stairs and framing, decking and outdoor, and set-out and measuring. Every calculator with a guide on this site is listed on this page, and each guide explains the formula it uses and the numbers it expects.
- Do the calculators work in metric and imperial?
- Yes. Every calculator accepts both, and you can switch units at any point without re-entering your measurements. Imperial input takes feet and inches with fractions, so you can type what's written on your tape rather than converting it in your head first.
- Do I need an internet connection to use them?
- No. All the maths runs on the device, so the calculators work in a basement, in a lift shaft, or on a site with no reception. Nothing you enter is uploaded to be calculated.
- Which calculator should I use for a concrete slab?
- The concrete calculator. It handles slabs, footings, post holes and columns, and returns the volume plus a bag count if you're mixing on site rather than ordering a truck. If you're working out how much fill goes under the slab, the gravel and soil calculators cover that.
- Is Chippy Tools free?
- The app is free to download on iOS and Android and the core calculators are free to use. Some advanced features are part of the paid tier — full details are on the pricing page.