Last updated October 4, 2026.
What you type
The calculators and the reference finders run entirely in your browser. The measurements you enter, the plan review comments you paste and the searches you make are not sent to Calcitect or to anyone else.
What is kept on your own device
So that the site picks up where you left off, your browser stores a few things on your device: what is in the calculator boxes, the running total, the tape of past calculations, your rounding and unit choices, and your last search on a finder. This never leaves your device. Clearing your browser's site data removes it, and the Clear buttons remove the tape and the running total.
Visit counts
The site uses Vercel Web Analytics to count visits. It does not use cookies and does not identify you. It records which page was opened, the site that linked to it, and general details such as country, browser and type of device.
Hosting
The site is hosted by Vercel. As with any website, the host's servers receive your IP address in order to send you the page.
What the site does not do
- It has no accounts and asks for no name, email address or payment.
- It sets no cookies.
- It shows no advertising and shares nothing with advertisers.
Links
The finders link to government websites, which have their own privacy practices.
Changes
If any of this changes, for example if advertising is added, this page will be updated first and the date at the top will change.
Calculators
- Feet & inches calculatorAdd, subtract, multiply and divide feet, inches and fractions. Free, nothing to install.
- Decimal feet to feet & inches converterType a length in any one box: decimal feet, feet and inches, inches or millimeters. The other three fill in.
- Roof pitch & rafter length calculatorEnter any two of pitch, rise, run and diagonal. The other two fill in.
- Stair calculatorEnter the floor-to-floor rise to get risers, treads, total run and stringer length.
- Circle & arc calculatorEnter a diameter for circumference and area. Add an angle for arc length and chord.
- Square footage & volume calculatorEnter length and width for area. Add a height for volume, cubic yards and wall area.
- Stud & on-center spacing calculatorEnter a length and a spacing to get the member count, the last bay and the equal spacing.
- Concrete calculatorPick slab, footing, wall or round column, type the size in feet and inches, and get cubic yards and bags.
- Slope converterType a slope as inches per foot, percent, degrees or a ratio. The other three fill in.
- Gravel, sand, soil & mulch calculatorPick the material, type the length, width and depth, and get cubic yards and approximate tons.
- Drawing scale calculatorEnter a scale and a length to convert it, or a drawn length and its real size to find the scale.
Reference finders
- DSA forms & publications finderType a topic or a number, or paste a plan check comment, and see which DSA documents to open.
- OSHPD / HCAI CAN, PIN & forms finderType a topic or a number, or paste a plan review comment, and see which HCAI documents to open.