Free Trade Tools & Calculators

By Chris Gaglardi
| Last Updated September 17, 2026

Professional-grade construction calculators designed for skilled trades pros, students, and DIYers. All tools run 100% in your browser—no downloads, no installs, no tracking.

Plan a conduit bend, compute voltage drop, generate a pipe template, optimize a cut list, or estimate a bid. Each tool includes visual layouts, shareable links, and job-friendly outputs.

Electrical Tools

Essential electrical calculators for planning installations, sizing conductors, estimating costs, and staying code-aware.

Voltage Drop Calculator + Payback Planner
Calculate voltage drop for single-phase and three-phase circuits. Includes power factor, AWG/mm² sizing, copper/aluminum comparison, temperature adjustment, and a payback estimator for upsizing conductors. Estimate kWh line loss and annual energy costs. Also known as a voltage drop calculator with energy cost analysis.
Conduit Bending Planner
Plan two-bend offsets, three-bend saddles, four-bend saddles, 90° stubs, and back-to-back 90s. Get mark spacing, multipliers, shrink, take-up, and springback adjustments. Includes visual layout, phone tilt readout, and PNG/SVG export. Conduit bending calculator functionality included.
Conduit Fill & Box Fill Calculator
Check conduit fill limits and junction box capacity quickly. Add conductors by outside diameter (or use presets), compute allowable fill by conductor count, and verify box volume with device yokes and equipment grounds. Includes shareable links and print-friendly output. NEC-aware conduit and box fill calculations.
Rolling Offset Calculator
Plan rolling offsets with a live diagram. Enter vertical and horizontal offsets, pick a bend angle (or enter custom), and get travel (center-to-center) and advance distances with multipliers. Drag the interactive point to adjust values. Includes shareable links and print-friendly output. Visual rolling offset calculator with travel and advance.

HVAC, Pipefitting & Welding Tools

EPA 608 Practice Test
Free EPA Section 608 practice for Core, Type I, Type II, Type III, and Universal simulation. Review source-backed explanations, drill weak areas, and keep progress in this browser. Independent study tool, not an official EPA exam.
HVAC Duct Sizer + Superheat/Subcool
Size round or rectangular ducts from target velocity or presets. Get area, diameter, and equivalent rectangular sizes. Includes velocity presets for supply/return/quiet zones, unit conversion (IP/metric), and a quick superheat & subcooling calculator with refrigerant P-T lookup. Ideal for HVAC design and service checks. Ductulator-style sizing with charge calculator.
Pipe Miter & Fishmouth Template Generator
Generate full-scale printable templates for pipe miters, fishmouths, and coping joints. Enter pipe diameters and angles, print at 100% scale, wrap around the pipe, and cut. Ideal for welding and pipe fitting. Pipe template generator for miters and coping.
Pipe Slope Calculator
Calculate drain fall, pitch, grade, and invert elevations. Convert inches per foot, percent, 1:n ratio, mm/m, and degrees, then compare results with 2024 IPC and UPC model-code baselines and drill the same math in Practice Mode. Pipe slope calculator for drain fall, pitch, and grade.

Rigging & Safety Tools

Calculate loads, angles, and safety factors for rigging operations. Ensure safe lifts and sound planning.

Rigging Sling Angle & Load Calculator
Interactive rigging calculator with visual sling-angle planner. Drag pick points, set hitch type, see per-leg tension, load share, and D/d ratio. Export a PNG lift plan for job documentation. Includes safety notes and angle limits. Rigging calculator for sling tension and load share.

General Construction Tools

Practical tools for estimating, planning, and optimizing material usage across all trades.

Cut-List Optimizer (Kerf-Aware)
Optimize material cutting to minimize waste. Enter stock lengths and required cuts, set kerf width, and get an efficient cutting plan. Shows waste per stock piece, total waste, and visual cut layout. Ideal for lumber, pipe, conduit, or any linear material. Cut list calculator with kerf.
Job Bid Estimator
Estimate job bids with detailed cost breakdowns. Enter labor hours, hourly rates, material costs, overhead percentage, and profit margin. Get itemized totals, subtotals, and final bid amount. Export or print estimates for clients.
Concrete Calculator
Estimate concrete volume for slabs, footings, post holes, and round forms. Get cubic yards, cubic feet, waste factor, bag counts for common mix sizes, and ready-mix order rounding. Useful for pours, pads, and foundation material takeoffs. Concrete volume calculator with bag and ready-mix estimates.
Stair Calculator
Calculate stair risers, tread depth, total run, angle, and straight-stringer layout geometry. Supports feet, inches, fractions, metric units, a live side-elevation diagram, available-run checks, and 2024 IRC / AWC DCA 6 model-code reference warnings. Stair rise, run, and stringer layout calculator.
Rafter Calculator
Calculate roof pitch, rise, run, common-rafter line length, and overhang from building span or direct rafter run. Includes construction-friendly fractions, a live dimensioned diagram, shareable layouts, and print-friendly results.
Architectural Scale Calculator
Convert architectural, engineering, metric, and custom drawing scales. Find an unknown plan scale from a known dimension, work in feet/inches/fractions, and check how far a print has been resized. Blueprint measurement converter with print-scale verification.
NCCER Core Practice Test
Practice for the NCCER Core 6th Edition Level Test with a free 89-question blueprint-weighted mock, quick drills, module study, explanations, and weak-area review. No signup required. Independent study tool, not an official NCCER exam.

Career & Lifestyle Tools

Explore career decision tools that can help you compare training routes, lifestyle costs, and trade-school options.

Trade School Cost & Payback Calculator
Estimate your personal training cost, financing, lost income during school, and potential break-even time using a real program quote. Compare that path with continuing at your current gross income before you enroll.
CDL Training Cost & Payoff Calculator
Estimate CDL training costs, time to first paycheck, and a rough payoff window. Compare private CDL school, community college, company-sponsored training, reimbursement, and veteran pathways before you start searching.
CDL Practice Test
Practice CDL General Knowledge, Air Brakes, and Combination Vehicles questions with explanations, weak-topic feedback, and official study resources. Free, no account, and your history stays in this browser.
Apprenticeship vs Trade School Path Finder
Compare apprenticeship-first, trade-school-first, pre-apprenticeship, hybrid, work-first, and fast-entry routes by trade, budget, timeline, and need to start earning. Useful if you are weighing electrician, plumbing, HVAC, welding, CDL, and similar paths.
Fast Career Training Finder
Compare short career training options by timeline, cost comfort, work style, physical demands, licensing complexity, and national wage snapshots. Useful for narrowing down fast healthcare, trades, CDL, and tech-adjacent training paths.
Medical Coding Practice Lab
Practice ICD-10-CM code lookup, chapter recognition, flashcards, and beginner-friendly fictional coding scenarios. A free educational study aid for exploring medical coding basics before or during training.
CNA Practice Test
Take a free 20-question nursing assistant quiz covering resident care, safety, infection control, communication, vital signs, and CNA scope boundaries. Get optional answer feedback, a score summary, and missed-question review.
PTCB Practice Test
Try a free 20-question pharmacy technician quiz covering medication safety, pharmacy math, prescriptions, drug classes, inventory, and pharmacy law basics. Get instant feedback, explanations, and missed-question review.
EKG Practice Test
Practice entry-level ECG technician concepts with a randomized 20-question quiz covering lead placement, waveforms, rhythm basics, patient prep, safety, and artifact recognition. Includes instant feedback and missed-question review.
CCMA Practice Test
Free NHA CCMA practice with 250 original questions, a 30-question diagnostic, domain drills, and a 180-question timed exam simulation. No signup required. Independent study tool, not an official NHA exam.
Phlebotomy Practice Test
Take a free 100-question phlebotomy practice test aligned to the NHA CPT blueprint, plus an order-of-draw trainer and tube-additive matcher with explanations. No signup required. Independent study tool, not an official NHA exam.
Dosage Calculation Practice
Practice medical math with a randomized 20-question dosage calculation quiz covering unit conversions, tablets, liquid medications, IV flow rates, drops per minute, and pharmacy math basics. Includes instant feedback and missed-question review.
EPA 608 Practice Test
Practice EPA Section 608 Core, Type I, Type II, Type III, or a full Universal simulation with explanations, weak-area drills, and local progress. Free, no account, and independent of EPA-approved certifying programs.
Mechanical Aptitude Test
Take a free mechanical aptitude practice test with 96 original questions on gears, pulleys, levers, hydraulics, motion, circuits, and tools. Includes explanations, topic drills, and optional timed practice. Independent study tool, not an official employer or publisher exam.
ASE Practice Test
Take free original ASE practice tests for A1-A9 and G1. Use learning or exam-style mode, get answer explanations, and see which automotive systems need more study. Independent study tool, not an official ASE exam.
NCCER Core Practice Test
Practice NCCER Core with an 89-question mock, 25-question drills, module study, and weak-area review. Questions follow the current Core Level Test blueprint. Independent study tool, not an official NCCER exam.
Shift Differential Calculator
Estimate night, evening, weekend, or other shift differential pay. Compare weekly and annual gross earnings and see how a flat or percentage premium can affect the regular rate used for federal overtime.
Price Your Life: The Lifestyle Quiz
Build a lifestyle budget, apply cost-of-living and tax assumptions, and see the gross income required to afford it. Matches you with careers that can cover the total using 2024 BLS median wage data.

Why Use These Tools?

These calculators and planners are designed with real-world trades work in mind:

Privacy-first: All calculations run in your browser. No data is sent to any server.
Shareable: Most tools generate shareable URLs so you can send your work to coworkers or save for later.
Visual: Interactive diagrams, drag-and-drop interfaces, and exportable images.
Mobile-friendly: Use them on the job site with your phone or tablet.
Free: No subscriptions, no ads, no sign-ups. Just tools that work.

Looking for Training?

If you're using these tools to learn a trade or prepare for a career, check out our school finder to find trade schools and vocational programs near you. From electrician training to welding certification, we can help you find the right program.

Already working in the trades? Share these tools with apprentices, coworkers, or students. Bookmark this page for quick access to all the calculators.