Enter the real inputs
Inputs use familiar units, practical defaults and visible hints. Change the assumptions that matter for your situation.
17 free tools for real projects
Free construction calculators. Clear answers.
Measure the project, check the assumptions and build a takeoff you can explain. Each calculator includes a measurement guide, worked examples and source notes.
No account · No paywall · Full result breakdowns
Try a real calculation
US customaryRoom or fence perimeter
Change a measurement. See your answer instantly.
Required linear length61 linear ftGross perimeter 64 ft − 3 ft of openings
No waste or purchase rounding is added in this preview.
Open the full Linear Feet CalculatorCalculator categories
Start with the work you are doing.
Choose the area you are working in, then open one of the calculators currently available.
Construction Materials Calculators
Brick, masonry, reinforcing steel, lumber, aggregates, paving and measurement tools for practical construction estimating.
Concrete & MasonryAggregates, Paving & FillLumber, Drywall & FinishesMeasurement & Material Estimating
Home Improvement Calculators
Home addition budgets, paint quantities and roof geometry, with measurement guides and editable project assumptions.
Renovation & Structural ProjectsInteriors & Finishes
Building Trades Calculators
HVAC duct and load planning, pipe weights and recessed-light layouts, with transparent methods and design limits.
HVAC & AirflowElectrical & SolarPlumbing & Piping
Popular starting points
Useful calculators, ready now.
Open a tool, adjust the inputs and get a result immediately. Nothing to install and no account to create.
Materials
Building Material Calculator
Estimate material packages, studs, plate stock and lumber quantities with separate worksheets and a project list.
Calculate now →MaterialsBitumen Calculator
Estimate asphalt mix and binder quantities, reverse coverage and an editable driveway budget.
Calculate now →MaterialsConcrete Block Calculator
Concrete, cinder block and CMU calculator for wall takeoffs, openings, waste, mortar, grout/core fill, rebar, pallets and costs.
Calculate now →MaterialsLinear Feet Calculator
Calculate linear feet from pieces, runs, perimeter or area, then estimate stock pieces and cost per foot.
Calculate now →HomeHome Addition Cost Calculator
Estimate home addition costs with editable local rates, itemized low-to-high ranges, permits and contingency. Compare options and save your budget report.
Calculate now →TradeHVAC Duct Calculator
Check duct airflow, velocity and friction, then investigate equipment loads in a separate planning worksheet.
Calculate now →What you can calculate
From a rough question to a usable estimate.
Efficienco connects related calculators around the same practical job, so it is easier to move from measurements to quantities, costs and context.
MaterialsConcrete & masonry
Estimate concrete, masonry units, mortar, grout, reinforcement and related material quantities.
MaterialsPaving & aggregates
Estimate asphalt, aggregate, paving, base, fill and related purchasing quantities.
MaterialsLumber & finishes
Estimate lumber, sheet goods, drywall and finish-material quantities for building projects.
MaterialsMeasurement & estimating
Convert dimensions and estimate areas, volumes and material quantities for construction planning.
HomeRenovation & structures
Plan renovation and structural-project quantities, scope and preliminary costs with editable assumptions.
HomeInteriors & finishes
Estimate interior finish quantities and project requirements for rooms, surfaces and fixtures.
TradeHVAC & airflow
Work through duct dimensions, airflow, velocity, friction and pressure assumptions for HVAC planning.
TradeElectrical & solar
Calculate practical electrical and solar planning values with explicit inputs and assumptions.
TradePlumbing & piping
Estimate pipe, flow, volume and pressure-related values for plumbing and mechanical work.
Practical guides
Understand the number—not just the result.
Our guides explain formulas, assumptions, examples and edge cases connected to the calculators.
Trade guide
Recessed Lighting Layout: Spacing, Lumens and Beam Coverage
Plan a recessed lighting layout using room dimensions, maximum spacing, lumen targets, ceiling height, beam angle and wall-wash geometry.
Home guide
How Much Does a Home Addition Cost in 2026? Prices by Size and Type
Plan a realistic 2026 home addition budget using cost-per-square-foot ranges, project size, room type, structural work, and overlooked expenses.
Trade guide
When Square Footage Fails to Predict System Size
Learn why square footage alone cannot size an HVAC system, how Manual J accounts for heat loads, and what to check in an installation quote.
How Efficienco works
Transparent enough to check. Fast enough to use.
A calculator should help you make sense of a problem, not merely produce a confident-looking number.
Review the breakdown
Results show supporting values and units so you can see how the total was built, copy it and compare scenarios.
Check the context
Use annotated measurement diagrams, worked examples and product checks on the same resource page. Keep quantities separate from structural or system design.
Common questions
Before you calculate.
The short version: the tools are free, immediate and designed to make their assumptions visible.
Are Efficienco calculators completely free?
Yes. You can use every live calculator without creating an account or entering payment details.
How accurate are the calculator results?
The arithmetic follows the displayed inputs and assumptions, but the quality of any estimate depends on the information entered and the limits of the model. Product specifications, local prices, regulations and project conditions should be verified when they matter.
Can I use the results for a professional project?
Use the tools for planning, comparison and preliminary estimation. Structural, financial, electrical, mechanical, legal or safety-critical decisions may require current documentation and review by a qualified professional.
What if I find a calculation problem?
Every calculator and guide includes a small problem-report link. Send the page URL and a short description to viaan@efficienco.com so the issue can be investigated.
Find the right calculator and get moving.
Browse all 17 tools by category, or open a practical guide when you want to understand the formula first.