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Free Calculators & Tools
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Estimate materials, price jobs, and run your business. Fast answers for your next job — no fees, no popups.

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Most Popular Tools

Watts to Amps Calculator Hot

Convert watts and volts to amps. Includes appliance reference table.

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Lumber Calculator

Calculate board feet and cost for any lumber order.

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Drywall Mud Calculator

Buckets of joint compound needed by coat stage.

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Amp Calculator Popular

Convert between watts, amps, volts, and ohms using Ohm's Law.

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Concrete Calculator

Cubic yards and bags for slabs, footings, columns, and stairs.

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Stair Calculator

Risers, tread depth, total run — with code compliance check.

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Square Footage Calculator

Calculate area for rooms, floors, and multiple spaces.

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Mileage Tracker

Log work miles and export IRS mileage deduction report as PDF.

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⚡ Electrical Calculators

5 tools

Watts to Amps Calculator

Input watts + volts, get amps. Includes appliance reference table.

Amps to Watts Calculator

Reverse calculation — input amps and volts, output watts.

Amp Calculator (Ohm's Law)

Convert between any two of: watts, amps, volts, ohms.

Wire Size Calculator

Recommended AWG wire gauge based on amps, distance, voltage.

Voltage Drop Calculator

Calculate voltage drop % and check if it's within the 3% limit.

🪵 Construction Materials

11 tools

Lumber Calculator

Board feet, quantity, and cost estimate for any lumber order.

Drywall Mud Calculator

Joint compound by coat — taping, second coat, and finish coat.

Paver Sand Calculator

Base sand, leveling sand, and polymeric joint sand by cubic yard.

Sonotube Calculator

Concrete bags (60lb or 80lb) for tube forms. Frost line reference.

Concrete Calculator

Cubic yards and bags for slabs, footings, columns, and stairs.

Square feet, pallets needed, and estimated sod cost.

Brick Calculator

Number of bricks and bags of mortar for any wall.

Pea Gravel Calculator

Cubic yards and tons for any area and depth.

Roofing Shingle Calculator

Squares and bundles needed based on roof dimensions and pitch.

Tile Calculator

Number of tiles with waste factor for any floor or wall area.

Shower Tile Calculator

Tile quantities for shower walls, floor, and niches with waste factor.

🌡️ Insulation & Energy

Cellulose Insulation Calculator

Bags needed for target R-value and current depth.

R-Value Calculator

R-value from thickness, or required thickness from target R-value.

Heat Loss Calculator

BTU/hr heat loss for a room based on dimensions and insulation.

Recommended BTU for heating or cooling any room size.

📏 Measurement & Conversion

Inch Fraction Calculator

Convert decimals to fractions, add and subtract tape measure readings.

Square Footage Calculator

Area in sq ft and sq yd. Add multiple rooms.

Cubic Yard Calculator

Order the right amount of fill dirt, gravel, or mulch.

Board Foot Calculator

Board feet from thickness, width, and length.

Price Per Sq Ft Calculator

Price-per-sqft from total, or total cost from sqft and rate.

💰 Cost Estimators

Deck Cost Calculator

Materials list and cost range for pressure treated, composite, or cedar.

Flooring Cost Calculator

Material + labor estimate for hardwood, laminate, vinyl, or tile.

Siding Cost Calculator

Squares and estimated cost by siding type.

Fence Cost Calculator

Posts, rails, pickets, and cost for wood, vinyl, or chain link.

Privacy Fence Calculator

Detailed materials list for a 6ft privacy fence.

🏗️ Structural Calculators

Deck Joist Calculator

Recommended joist spacing for any span and joist size.

Rafter Length Calculator

Rafter length from building width, pitch, and overhang.

Roof Pitch Calculator

Pitch ratio and degrees from rise and run.

Stair Calculator

Risers, riser height, tread depth, and code compliance check.

Stair Angle Calculator

Stair angle in degrees from rise and run per step.

Baluster Spacing Calculator

Number of balusters and exact spacing for code compliance.

💡 Lighting & Layout

Recessed Lighting Calculator

Number of lights and spacing with visual grid layout preview.

TV Mount Height Calculator

Optimal TV center height based on size, distance, and eye level.

Lumen Calculator

Recommended lumens and bulb count by room type.

🔧 Plumbing Calculators

Water Heater Size Calculator

Recommended tank size (gallons) by household size and bathrooms.

Pipe Size Calculator

Recommended pipe diameter from flow rate (GPM) and pressure.

💼 Business Tools

Billable Hours Calculator

Invoice total with labor, materials, overtime, and travel time.

Markup Calculator

Selling price from cost + markup %, or reverse-calculate markup.

Profit Margin Calculator

Profit margin percentage from revenue and total costs.

Mileage Tracker

Log trips, calculate IRS deduction, and export PDF report.

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Break Even Calculator

Jobs needed to cover fixed costs at your average job revenue.

📄 Document Templates

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Landscaping Contract

Fill in your details and download a professional PDF contract.

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Cleaning Service Agreement

Service type, frequency, pricing — generate a PDF agreement.

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Subcontractor Agreement

Scope of work, payment terms, insurance requirements.

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Customer Satisfaction Survey

5-question survey to send clients after completing a job.

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About ContractorCalcs

Free calculators and tools built for contractors, handymen, and tradespeople. No signups, no fees — just fast answers for your next job. From electrical to structural to business math, everything you need is one tap away.