Professional Calculators
Built for Precision
Stop guessing and start building. Access 48 free, engineering-grade tools for home improvement, HVAC, and mortgage planning. Trusted by 50,000+ contractors and homeowners.
Explore Our Free Calculator Library
Professional-grade estimation tools at your fingertips. Browse by category or use the search below to find the exact calculator for your home project.
HVAC & Energy
HVAC Load Calculator
Free Manual J load calculation. Get accurate BTU requirements for your home to choose the right size furnace and AC system. Avoid costly mistakes.
AC Size (BTU) Calculator
Find the perfect air conditioner size. Our BTU calculator helps you determine the right cooling capacity for any room based on size and conditions.
Duct Size Calculator
A free HVAC duct sizing calculator to determine the proper duct diameter for your system based on airflow (CFM). Ensure optimal performance.
SEER Savings Calculator
Estimate your annual savings by upgrading to a high-efficiency AC unit. See your potential cost reduction and payback period with a new SEER2 system.
Mini-Split Cost Estimator
Get a budget estimate for a new ductless mini-split system. Find the installed cost for a single-zone or multi-zone setup for your home.
Furnace Cost Estimator
Planning a furnace replacement? Get an estimated cost for a new gas, electric, or oil furnace installation based on your home size and climate.
Heat Pump Cost Estimator
Estimate the total installed cost of a new heat pump. Compare prices based on unit size and efficiency (SEER2) to budget for your project.
Thermostat Savings Calculator
See how much you can save on your energy bill. Calculate annual savings from using a programmable or smart thermostat with temperature setbacks.
Attic Insulation Calculator
Find out how many bags of blown-in insulation you need. Calculate the material required to reach your attic's recommended R-value for your zone.
Ventilation Fan CFM Calculator
Calculate the right CFM for your exhaust fan. Ensure proper bathroom or kitchen ventilation with our airflow capacity and fan sizing tool.
Dehumidifier Size Calculator
Find the right dehumidifier size for your basement or room. Calculate the correct pint capacity based on room size and moisture level.
Home Improvement
Paint Calculator
Estimate how much paint you need. Calculate the gallons of paint required for your walls, ceiling, and trim for any room in your house.
Flooring Calculator
Calculate the square footage of flooring needed for your project. Works for tile, laminate, or hardwood, including a vital waste factor.
Siding Calculator
Estimate the total siding material needed for your home. Calculate the squares of vinyl, fiber cement, or wood siding for your project.
Wallpaper Calculator
Calculate the number of wallpaper rolls you need. Our estimator accounts for pattern repeat and waste, ensuring you buy the right amount.
Kitchen Remodel Estimator
Get a kitchen renovation cost estimate. Create a budget for your remodel based on kitchen size and quality of cabinets, countertops, and appliances.
Tile Calculator
Calculate how many tiles you need for a floor, wall, or backsplash. Our calculator accounts for grout lines and waste to ensure accuracy.
Deck Cost Calculator
Get a detailed deck cost estimate. Our calculator breaks down material and labor costs for framing, decking, railings, and foundation.
Decking Materials Calculator
Quickly estimate your deck materials. This tool calculates the number of decking boards and framing components for a simple rectangular deck.
Mortgage & Finance
Mortgage Calculator
Estimate your monthly mortgage payment with our free PITI calculator. Includes principal, interest, taxes, insurance, and PMI.
Mortgage Payoff Calculator
Pay off your mortgage faster. See how extra payments can shorten your loan term and calculate your total interest savings.
Home Affordability Calculator
How much house can I afford? Our calculator helps you determine a comfortable home budget based on your income, debts, and down payment.
Car Loan Calculator
Calculate your monthly car payment. Our free auto loan calculator helps you estimate payments and see the total interest cost for your new car.
Savings Calculator
Project the future growth of your savings or investments. Our compound interest calculator shows how your money can grow over time.
Construction Materials
Concrete Calculator
Calculate concrete volume in cubic yards and bags. Our concrete slab calculator makes it easy to estimate materials for your patio or footing.
Gravel Calculator
Calculate the amount of gravel or crushed stone you need. Get project estimates in cubic yards and tons for any landscape or driveway project.
Roofing Materials Calculator
Estimate your roofing materials needs. Calculate the number of shingle bundles and roofing squares required based on your roof's area and pitch.
Drywall Calculator
Estimate your drywall project materials. Calculate the number of drywall sheets, screws, and joint compound you need for your walls or ceiling.
Lumber Calculator
Calculate the board feet and total cost of lumber for your construction project. Ideal for framing, decking, and woodworking projects.
Sand Calculator
Calculate the volume and weight of sand needed for pavers, sandboxes, or masonry. Estimates in cubic yards and tons.
Brick Calculator
Estimate the number of bricks and amount of mortar needed for your wall or patio project. Accounts for joint thickness and waste.
Concrete Block Calculator
Determine the number of 8x8x16 CMUs, mortar, and rebar required for a retaining wall or foundation.
Rebar Calculator
Calculate the total length and weight of steel reinforcement bars needed for concrete slabs, footings, and walls.
Framing Calculator
Estimate the number of studs and top/bottom plates needed for a wall project. Includes common spacing options.
Landscaping & Outdoor
Landscaping Cost Calculator
Budget for your dream yard. Estimate costs for major landscaping features like sod, patios, plants, grading, and irrigation system installation.
Patio Cost Calculator
Estimate the total cost to build a new paver, concrete, or stone patio. Our calculator helps you budget for materials and professional labor.
Retaining Wall Calculator
Calculate the materials for your retaining wall. Estimate the number of blocks, caps, and the amount of gravel base and backfill needed.
Fence Cost Calculator
Get a quick fence cost estimate. Calculate the total cost for wood, vinyl, or chain link fences, including materials and labor rates.
Fence Materials Calculator
Plan your fence project with our free calculator. Estimate the number of posts, pickets, and rails you need to buy for your new fence.
Soil & Mulch Calculator
Calculate the volume of soil or mulch for your garden. Get estimates in cubic yards or bags to ensure you buy the right amount for your beds.
Fertilizer Needs Calculator
Apply the right amount of fertilizer to your lawn or garden. Our calculator helps you determine application rates based on your soil test.
Energy & Utilities
Appliance Energy Cost
Estimate the electricity cost of any appliance. Calculate the annual energy usage and operating cost based on wattage and usage.
Energy Savings Calculator
Compare two appliances to see your potential energy savings. Calculate the annual cost difference when upgrading to a more efficient model.
Water Heater Cost Calculator
Compare the annual energy costs of standard tank vs. tankless electric water heaters to see which model can save you the most money.
Solar Savings Calculator
Estimate your potential savings from a home solar panel system. Calculate the payback period and your return on investment (ROI).
Real Estate & Property
Rental Property Calculator
Analyze real estate investments. This tool calculates cash flow, cash on cash return, and cap rate for potential rental properties.
Home Equity Calculator
Calculate the equity in your home. Estimate how much you can borrow with a home equity loan or HELOC based on your property value.
Why Choose HomeCalc Pro?
We deliver actuarial precision for your most important home projects.
Specialized for Home Improvement
We focus only on home improvement and HVAC calculators—just what homeowners and contractors need.
Professional Accuracy
Our HVAC calculators follow ACCA Manual J standards. Material calculators use industry formulas for 95%+ accuracy.
Works on Your Phone
Use calculators on-site from your phone. Save and share results. No app download needed.
Save $500-$5,000 Per Project
Accurate calculations mean buying exactly what you need. No waste, no mistakes, no oversized equipment.
100% Free & Private
No account required. No email collection. No spam. Your project details stay private.
HomeCalc Pro by the Numbers
Engineered for scale, trusted by industry leaders and DIY enthusiasts alike.
+
Calculations Monthly
+
Professional Tools
+
Trusted Homeowners
%+
Accuracy Rate
Who Uses HomeCalc Pro?
Our precision tools are engineered for diverse needs, from complex HVAC sizing to personal financial planning.
DIY Homeowners
Eliminate material waste and overbuying. Get exact measurements for paint, flooring, and landscaping projects instantly.
Trade Professionals
Field-ready Manual J calculations and concrete estimations. Professional-grade results on any device, anywhere.
Financial Buyers
Analyze mortgage affordability and loan payoffs with actuarial precision. Make the biggest decisions of your life with confidence.
Real Projects, Real Savings
See how HomeCalc Pro helps users make data-driven decisions that save thousands.
"Calculator said I needed 2.5 gallons. I was going to buy 4! Saved $85 and avoided waste."
Sarah M.
Phoenix, AZ
Impact
$85 + no extra store trip
Kitchen Paint Job
"Contractor quoted a 5-ton unit. Calculator showed I only needed 3-ton. Got a second opinion and saved $3,200!"
Mike T.
Dallas, TX
Impact
$3,200 on equipment
AC Replacement
"Replaced my $200/year software with this free tool. Use it on my phone at every job."
James R.
HVAC Contractor
Impact
$200/year subscription cost
Used: HVAC Load Calculator daily
"The calculator gave me a precise materials list. The lumber yard was impressed! I had almost zero waste."
Emily C.
Seattle, WA
Impact
$250 in extra materials
DIY Deck Build
"This tool was a lifesaver. It estimated everything from drywall sheets to the amount of mud. Made budgeting so much easier."
David L.
Chicago, IL
Impact
Multiple store trips avoided
Basement Finishing
Actuarial Precision for
Every Calculation
At HomeCalc Pro, we believe that high-stakes home decisions shouldn't be based on guesswork. Whether you're sizing a complex HVAC system using Manual J standards or analyzing the 30-year impact of a mortgage rate, our tools deliver the same precision as professional desktop software.
Every algorithm on our platform is verified against industry code books and manufacturer specifications. We don't just provide numbers; we provide mathematical certainty to help you manage your most valuable asset—your home.
The HomeCalc Advantage
Manual J Compliance
Our HVAC tools follow the gold standard set by ACCA for heating and cooling loads.
Material Waste Logic
We factor in realistic waste percentages (10-15%) for concrete, lumber, and drywall.
Private-First Tech
Your project data is processed locally in your browser. We never store or sell your inputs.
Frequently Asked Questions
HomeCalcPro is your trusted source for over 45 free calculators, from our popular financial calculator selection to our detailed construction and home improvement tools.