About CalcSummit

CalcSummit publishes construction calculators written and reviewed by five licensed professionals: a Licensed Professional Engineer (PE), a Certified Professional Estimator (CPE), a Certified Construction Manager (CCM), a Registered Architect (RA), and an NCCER Master Trainer. Every formula is verified against ACI, IRC, IBC, or RS Means standards before publication and reviewed annually for accuracy.

Written and reviewed by:

CPE

CCM

RA LEED AP

M.Ed.

Meet the team →

Expert Reviewed

Updated April 2026

Sources Cited

Our Mission

CalcSummit exists for one purpose: to give contractors, estimators, builders, and homeowners construction calculation tools that are accurate and free to use. The construction industry runs on precise material quantities, cost estimates, and code-compliant dimensions. Errors cost money — over-ordering concrete wastes hundreds of dollars; under-ordering causes project delays and change orders.

Every CalcSummit calculator is written by a named, licensed professional, cross-verified against a named building code or industry standard, and reviewed annually for accuracy. We publish 503 calculators across five calculation disciplines — written by five credentialed authors whose licenses are publicly verifiable through their respective issuing bodies. No anonymous authorship. No generalist content. Construction calculation is a defined technical discipline, and CalcSummit operates within it.

Questions about our methodology or accuracy? Contact the CalcSummit editorial team at our contact page.

What We Cover

CalcSummit covers five calculation disciplines at the core of every construction project. Our topical border is the intersection of construction and calculation — the quantitative work that happens before, during, and after a build.

Volume Calculations

Concrete, cubic yards, bulk fill, and material volume for excavation and pour work.

Area Calculations

Square footage, roofing, flooring, and surface measurement for any project footprint.

Project Assembly

Deck, fence, stair, retaining wall, and structural assembly planning calculations.

Cost Estimation

Material budgeting with regional RS Means-informed pricing benchmarks, updated quarterly.

Unit Conversion

Construction math and unit conversion between imperial and metric measurement systems.

Note

What CalcSummit does not cover: mortgage and real estate calculations, interior decorating, contractor hiring or pricing, investment advice, or medical and legal guidance. These topics fall outside our topical border.

Meet the Team

CalcSummit's five authors hold credentials across every major construction discipline. Each author writes and verifies calculators within their licensed specialty. Their credentials are not assertions — every license number below links to the issuing body's public verification registry.

Alex Rivera, PE — Licensed Professional Engineer

PE #C-89412PE #P.E.-98765

Alex Rivera is a Licensed Professional Engineer (PE) with 18 years of structural and civil engineering experience. He holds PE licenses in California (#C-89412) and Texas (#P.E.-98765). He previously served as Engineer of Record on 250+ residential foundation designs at Thornton Tomasetti. At CalcSummit, he writes and personally reviews every structural, concrete, rebar, deck, and framing calculator against current IRC and ACI 318 standards.

Full profile & calculator list →

Sarah Kim, CPE — Certified Professional Estimator

CPE ASPE CPE #20-4891

Sarah Kim is a Certified Professional Estimator (CPE) with 15 years of construction cost estimation experience. She holds CPE certification from ASPE (member #20-4891). At Turner Construction, she managed material cost analysis on commercial projects ranging from $2M to $45M. At CalcSummit, she writes and verifies all cost estimation and interior finish calculators, updating regional cost benchmarks quarterly using RS Means-informed data.

Full profile & calculator list →

Marcus Johnson, CCM — Certified Construction Manager

CCM CMAA CCM #2019-1247

Marcus Johnson is a Certified Construction Manager (CCM) with 20 years of experience in residential and commercial site work. He holds CCM certification from CMAA (member #2019-1247). He has managed NALP-member landscape installation projects covering more than 2 million square feet of site work. At CalcSummit, he writes all landscape volume and bulk-material calculators, applying field-tested coverage rates for mulch, gravel, sand, topsoil, and fill dirt.

Full profile & calculator list →

David Chen, RA LEED AP — Registered Architect & LEED AP BD+C

RA CA #A-35207LEED AP BD+C #10294751

David Chen is a Registered Architect (RA) and LEED Accredited Professional BD+C with 16 years of architectural practice. He holds California architect license #A-35207 and LEED AP BD+C credential #10294751. Previously at Gensler, he co-authored two RCI whitepapers on roof assembly performance. At CalcSummit, he writes and verifies all building envelope calculators — roofing, siding, windows, gutters, and waterproofing — against IBC 2021 and NRCA standards.

Full profile & calculator list →

Rachel Torres, M.Ed. — Construction Education Specialist

NCCER MT MT #MT-2018-4492

Rachel Torres is a construction education specialist holding an M.Ed. and NCCER Master Trainer certification (#MT-2018-4492). With 14 years bridging field engineering at Kiewit Infrastructure and classroom instruction, she writes CalcSummit's conversion calculators, educational guides, and glossary content to NCCER and ICC curriculum standards. She developed the 'Construction Math Made Simple' course used by ACTE member programs.

Full profile & calculator list →

Editorial Standards

How We Verify Formulas

Each formula on CalcSummit is sourced from a named standard. Concrete design formulas reference ACI 318-19 (Building Code Requirements for Structural Concrete). Residential construction formulas reference IRC 2021 (International Residential Code). Commercial building formulas reference IBC 2021 (International Building Code). Building envelope and energy performance calculations reference ASHRAE standards. Regional cost benchmarks are sourced from RS Means-informed databases, updated quarterly.

Alex Rivera, PE, personally verifies all structural and concrete formulas against the current code edition. Sarah Kim, CPE, verifies all cost data and updates regional pricing on a 90-day cycle. No calculator publishes without the assigned author confirming formula accuracy in writing.

How We Assign Author Review

Each author verifies their own specialty domain and acts as a second reviewer for related domains. The table below documents every cross-review assignment.

Reviewer	Reviews Content From	Credential Basis
Alex Rivera, PE	Sarah Kim (structural cost calcs), Marcus Johnson (site-work structural specs)	PE credential validates structural and load-bearing content
Sarah Kim, CPE	Marcus Johnson (material cost data), David Chen (roofing/envelope cost figures)	CPE credential validates cost estimation data accuracy
Marcus Johnson, CCM	Rachel Torres (field measurement guides), Sarah Kim (site logistics)	CCM credential validates construction management sequencing
David Chen, RA	Alex Rivera (building code citations), Marcus Johnson (site spec compliance)	RA credential validates code compliance and building science
Rachel Torres, M.Ed.	All authors (educational tone, readability, glossary accuracy)	M.Ed. + NCCER validates pedagogical clarity across all content

Our Update Schedule

Calculator formulas receive annual review — verified against the current edition of the applicable standard. Cost calculators receive quarterly review when RS Means benchmark data updates. If an author's professional credential changes, their pages are updated within 7 days of the change.

Each author page displays a “Last Reviewed” date. That date reflects the most recent full accuracy audit of that author's assigned calculators. Readers who find a formula discrepancy can report it through our accuracy contact form.