Can I save or share my results?

You can bookmark the tool and export or copy results where available; some tools also support printing.

Construction Tools – Ratio, Spacing, Estimators & Coverage

Construction In-Progress Tools

Free browser-based construction calculators and estimators. Everything runs locally for privacy. Try our Concrete Mixer Ratio Calculator, Rebar Spacing Calculator, or Lumber Board Feet Calculator.

Concrete Mixer Ratio Calculator

Calculate ratios for cement, sand, and aggregate. v1.0

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Rebar Spacing Calculator

Calculate number of rebar pieces and spacing based on area dimensions. v1.0

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Lumber Board Feet Calculator

Calculate board feet from dimensions and quantity. v1.0

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Roof Pitch Calculator

Calculate pitch from rise and run, angles. v1.0

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Stair Tread/Riser Calculator

Calculate riser height and tread depth based on total rise. v1.0

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Drywall/Sheetrock Estimator

Estimate number of sheets needed for a room. v1.0

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Gravel/Aggregate Coverage Calculator

Calculate tons/cubic yards needed for an area and depth. v1.0

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Insulation R-Value Calculator

Calculate total R-value from material layers. v1.0

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Window U-Value Calculator

Converter/Calculator for U-value (thermal transmittance). v1.0

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Deck Load Capacity Calculator

Estimate load capacity based on joist size, span, and spacing. v1.0

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Construction Tools — FAQs

Are these construction tools accurate?

They use standard formulas and are accurate for educational and planning purposes, but they are not a substitute for professional engineering or architectural advice.

Do the tools run entirely in my browser?

Yes, calculations run client-side in your browser and no input data is sent to a server.

Can I save my results?

You can copy or screenshot results. There is no server-side saving.

About These Construction Tools

Starlight Tools offers privacy-first construction calculators for estimates and planning. Every calculation runs in your browser so your numbers stay on your device.