Last updated October 4, 2026.
These terms apply to www.calcitect.com ("Calcitect", "the site"). By using the site you agree to them. If you do not agree, do not use the site.
1. The tools are provided as they are
Calcitect is provided free of charge, "as is" and "as available", without warranties of any kind, express or implied, including warranties of accuracy, completeness, merchantability, fitness for a particular purpose and non-infringement. The site may contain errors, may be changed or withdrawn at any time, and may be unavailable.
2. You are responsible for checking results
The calculators do arithmetic on the numbers you type. They know nothing about your project: its site conditions, materials, loads, tolerances, drawings, specifications or legal requirements. A result can be wrong because of a mistyped entry, a misunderstood field, rounding, or an error in the site itself.
Before you cut, order, build or rely on a result in any way, check it independently. Quantities such as concrete volumes and bag counts are estimates. You are solely responsible for how you use any result.
3. No professional advice or services
Nothing on Calcitect is architectural, engineering, surveying, construction, legal or other professional advice or services. Using the site does not create a professional or client relationship of any kind with anyone. The site does not review, design, approve or certify anything, and it is not a substitute for a qualified, appropriately licensed professional who knows your project.
4. The calculators are not a code check
The calculators do not check a result against any building code, standard, regulation or manufacturer's requirement. Whether something complies is for you and the responsible professionals and authorities to determine.
5. The reference finders
The finders are an index of documents published by government agencies. Calcitect is not affiliated with, endorsed by or authorized by the Division of the State Architect, the Department of Health Care Access and Information, or the State of California.
- The lists are compiled from the agencies' websites on the date shown on each page. They may be incomplete or out of date, and a link may lead to a document that has since been revised, replaced or withdrawn.
- A search result is a suggestion of where to look. It is not an interpretation of any regulation, an answer to a plan review comment, or a statement of what an agency requires or will accept.
- The agency's own website and staff are the authority. Confirm the current document there.
6. Limit of liability
To the fullest extent permitted by law, the owner and operator of Calcitect is not liable for any loss, damage, cost, delay, injury or claim of any kind, whether direct, indirect, incidental, consequential or otherwise, arising from your use of the site or your reliance on anything on it, including errors in a calculation, a list or a link. This applies however the claim arises, including in contract, negligence or otherwise.
7. Links to other websites
The site links to websites it does not control. Calcitect is not responsible for their content or availability.
8. Using the site fairly
You may use the site for personal and commercial work. Do not attempt to disrupt it, and do not present it or its results as coming from a government agency or as professional certification.
9. Changes and governing law
These terms may be updated; the date at the top shows the latest version, and continuing to use the site means you accept it. These terms are governed by the laws of the State of California, without regard to its conflict-of-law rules. If any part of them is found unenforceable, the rest remains in effect.
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.