Free Contractor Calculators & Construction Tools
Professional jobsite estimation utilities for builders, tradesmen, remodelers, and DIYers. Click any calculator below to open the tool instantly!
Browse Contractor Categories
Concrete & Masonry
Slab volume, rebar grids, cement bags, sonotubes, and CMU cinder blocks.
Roofing Tools
Roof pitch, rafter lengths, shingle bundle squares, and roof area multipliers.
Framing & Carpentry
Wall studs, floor joists, fence posts, stair risers, and timber volume.
Landscaping & Fill
Mulch cubic yards, topsoil, gravel tonnage, and patio brick pavers.
Estimating & Business
Crew labor costs, material packages, markup percentages, and bid pricing.
Electrical Tools
Wire AWG gauge sizing, conductor distance limits, and circuit load capacity.
HVAC Sizing
BTU heat/cooling loads, AC tonnage, and mini-split room capacity.
Plumbing Tools
Pipe fluid volume capacity, water gallons, and drainage pipe slope drop.
Printable Reference Charts
Concrete mix ratio tables, rebar size charts, and standard lumber dimensions.
All Professional Tools
📏 Square Footage
Calculate total area for rooms, spaces, walls, and siding projects with custom waste percentages.
🧱 Concrete Calculator
Estimate required cubic yards of cement for slabs, footings, post holes, and structural framing.
⛓️ Rebar Grid Calculator
Calculate rebar grid linear feet, bar spacing, lap splice overlap, and 20ft sticks needed.
🛍️ Cement Bag Calculator
Determine exact bag counts across 40lb, 50lb, 60lb, 80lb, 25kg, and 40kg bag sizes.
🕳️ Sonotube Pier Calculator
Calculate concrete cubic feet and yards for cylindrical post holes and deck pier footings.
🧱 Concrete Block (CMU) Calculator
Calculate standard 8x8x16 cinder blocks, mortar bags, and core grout required for masonry walls.
📈 Roof Pitch & Slope
Calculate rise, run, slope angle degrees, pitch ratios (X:12), and drainage grades.
📐 Rafter Length Calculator
Calculate common rafter lengths, ridge cuts, and eaves overhang dimensions based on span and pitch.
🏠 Shingle Bundle Calculator
Calculate roofing squares, 3-tab shingle bundles, starter strips, and ridge cap bundles.
🪵 Wall Stud Calculator
Calculate 2x4 and 2x6 wall studs, top/bottom plates, corner posts, and door king studs.
🪵 Mulch Bed Calculator
Calculate cubic yards and 2 cu ft / 3 cu ft bagged bark mulch required for garden beds.
👷 Labor Cost Calculator
Calculate crew labor costs, burden rates, overtime multipliers, and total man-hours.
⚡ Wire Size & AWG Calculator
Determine required copper or aluminum AWG conductor size based on amperage load and circuit length.
❄️ BTU & AC Sizing Calculator
Calculate heating and cooling BTU requirements, AC tonnage, and mini-split unit sizes.
🚰 Pipe Volume Calculator
Calculate internal fluid capacity in gallons and liters for PVC, copper, and PEX piping runs.
🕒 Work Hours Tracker
Easily log start/end shift times, unpaid lunch breaks, and gross payroll pay totals on-site.
🪨 Gravel & Material
Determine cubic volume and aggregate tonnage for gravel, mulch, topsoil, and dirt.
🎨 Paint Estimator
Accurately calculate gallon requirements based on wall dimensions and paint coverage.
🔳 Tile & Cut Waste
Calculate tile quantities for kitchen and bathroom floor grid layouts including cut waste.
🪵 Board Foot Calculator
Estimate lumber dimensions in board feet quickly for woodworking, carpentry, and framing.
💵 Cost Per SqFt
Compare project and building materials relative to their total square footage or area.
🔄 Jobsite Unit Converter
Quickly convert length, weight, area, and volume measurements between metric and imperial units.
Frequently Asked Questions
How much do these calculators cost?
Fields Pocket is 100% free. We sustain our operation through light advertisements so that trade professionals can calculate instantly without active subscriptions.
Is my structural data secure?
Completely. We prioritize extreme privacy. Your measurements, calculations, locations, and data are processed locally on your browser and are never transmitted to external databases.
How do I save the application to my home screen?
On iOS or Android, tap your browser's share icon and select "Add to Home Screen" to install Fields Pocket as a native PWA utility.
Information & Support
About Fields Pocket
Our Mission
At Fields Pocket, our mission is to eliminate the guesswork on construction sites and home improvement projects. We provide ultra-fast, high-accuracy, and fully responsive calculation utilities tailored for field tradesmen, contractors, remodelers, and DIYers alike.
We understand that when you are on-site, you need answers immediately. There is no time to waste on logins, subscription popups, or heavy apps. That is why we built Fields Pocket as a web-first, instantly accessible utility suite that runs flawlessly on any mobile browser or desktop computer.
Privacy Policy
1. Our Absolute Commitment to Privacy
At Fields Pocket, we respect your privacy and believe that your professional measurements, costs, and project calculations are your business alone. We design and build our tools so that they operate entirely on your device (client-side). This means we collect zero personal data, location tracking records, or project specifications.
2. Information We Do Not Collect
Unlike traditional estimating software, we do not require you to sign up, log in, or provide credit card information to use our standard suite of calculators. We do not collect names, email addresses, project sizes, or material costs.
3. Cookies & Advertising Partners
To maintain Fields Pocket as a 100% free tool for contractors and craftsmen globally, we run lightweight, high-standard advertisements. Our third-party advertising partners (such as Google AdSense) may place cookies or web beacons in your browser to deliver personalized and relevant ads.
4. Contact Information
If you have any questions or feedback about our privacy practices, please contact us via our online contact form on our Support page.
Terms of Service
1. Acceptance of Terms
By accessing or using Fields Pocket, you agree to be bound by these Terms of Service. If you do not agree with any part of these terms, you must refrain from using our software.
2. Purpose & Use of Tools
Fields Pocket provides math-based estimation calculators for construction, landscaping, carpentry, painting, and trade estimation. These tools are provided strictly as an aid. While our math is designed to meet strict trade tolerances and standard equations, final calculations should always be checked on-site against structural designs and physical measurements by a certified professional before purchase or installation.
3. Disclaimer of Warranties
FIELDS POCKET IS PROVIDED "AS IS" AND "AS AVAILABLE", WITHOUT WARRANTIES OF ANY KIND, EITHER EXPRESS OR IMPLIED. WE DO NOT WARRANT THAT THE CALCULATIONS ARE 100% ERROR-FREE OR THAT THE SITE WILL BE ALWAYS SECURE OR OPERATIONAL.
4. Limitation of Liability
In no event shall Fields Pocket or its creators be liable for any direct, indirect, incidental, consequential, special, or exemplary damages, including but not limited to loss of materials, financial overestimation, structural failures, labor overruns, or any other professional losses resulting from your use or inability to use our tools.
Contact Support & Feedback
Have a request, suggestion, or question? We love to hear from active builders! Fill out the form below to send us a direct message.