Free exam tools
Work the math and code look-ups your exam asks for, and get the answer in seconds. Every tool is free, with no signup.
Each tool shows its formula and a worked example, then a free 10-question check that scores you by topic so you know what to fix first.
Alarm Ladder
Practice tests and drills
3 resourcesCheck yourself on questions, symbols and code look-ups, then see what to fix.
- Fire alarm symbols and abbreviations quizName 18 plan symbols and tags, from smoke detectors to NAC and SLC, with the tell for each look-alike.
- NAC circuit drill: Class A, B and X wiringTrace 15 wiring diagrams and call what an open, short or ground does on NAC, SLC and IDC circuits, Class A, B or X.
- NICET Fire Alarm Level II lookup drill: find the NFPA 72 chapter on a clockFind NFPA 72 chapters on a clock against a target pace you set, five questions for Fire Alarm Level II.
Tools and calculators
7 resourcesRun the math your exam asks for and get the answer in seconds.
- Fire alarm voltage drop calculator (NAC circuits)See the voltage left at your last NAC device, with a worksheet to print.
- Fire alarm standby battery calculator, with the method explainedSize a standby battery from your standby and alarm loads, step by step.
- Fire alarm wire size calculator (NAC circuits)Find the smallest wire gauge that keeps your NAC circuit in its voltage limits.
- NICET study planner: week-by-week plan by exam domainA week-by-week NICET plan built around your exam domains.
- Fire alarm audibility calculator: horn dBA at a distanceHorn or speaker dBA at your listening spot, several appliances added together, and the margin over the ambient you set.
- NICET level requirements: which fire alarm level is nextSee which fire alarm level is next and what experience is still missing.
- NICET Certification Cost Calculator (2026 Fees)Total your NICET fire alarm fees by track and level, with retakes, Express Evaluation and renewal itemized.
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Free 10-question check
See which topics to fix first. Free, with every answer explained.
Fillet Gauge
Practice tests and drills
9 resourcesCheck yourself on questions, symbols and code look-ups, then see what to fix.
- Welding symbols quiz: read the symbol, name the weldName the weld from its symbol, with a free chart to print.
- CWI code navigation drill: find the clause on a clock (Book of Specifications and D1.1)Find D1.1 clauses on a clock and build Part C speed.
- Weld gauge reading trainer: fillet gauge and V-WAC practicePractice reading a V-WAC gauge and a fillet gauge until it is automatic.
- CWI Part B practice: gauge readings and replica callsRead a Hi-Lo gauge, a V-WAC and a fillet weld, name the mark on a replica, then make the call against a practice spec.
- Weld discontinuities quiz: name the defectName porosity, undercut, overlap and 10 more from drawings, with the tell for each look-alike.
- Welding process quiz: SMAW, GMAW, GTAW, SAWName 7 welding processes and 4 GMAW transfer modes from drawings, then match shielding, polarity and flaws.
- Weld position trainer: 1G to 6G and 1F to 4F drillsName 1G to 6G and 1F to 4F from original drawings, or pick the drawing for a code, with the geometry explained.
- NDE methods quiz for CWI: PT, MT, RT, UTMatch VT, PT, MT, RT, UT and ET to the flaw and the material, with the reason each wrong method fails.
- WPS and PQR review drill for CWI Part CCheck 13 invented WPS, PQR and WPQ sets and catch the entry that is out of range.
Tools and calculators
10 resourcesRun the math your exam asks for and get the answer in seconds.
- CWI seminar and exam dates by city, 2026-27Find a CWI exam date and city to aim for.
- CWI eligibility checker: do I qualify for CWI or CAWI?Find out in a minute whether you qualify for CWI or CAWI.
- CWI exam cost calculator: initial fees, retests and the 72% ruleTotal your CWI exam cost, cost per part and what a retest adds.
- Welding symbol builder: draw a symbol and read itDraw a welding symbol and read back what it calls for.
- Fillet weld calculator: leg, throat, area and weld metal weightLeg to throat, volume and weight for one weld or a whole joint list.
- Carbon equivalent calculator: IIW CE and Pcm for welding steelGet IIW carbon equivalent and Pcm from a heat analysis, step by step.
- CWI math calculator: heat input, carbon equivalent, tensileHeat input, carbon equivalent and tensile math in seconds.
- Heat input calculator: kJ/in and kJ/mmVolts, amps and travel speed to heat input in kJ/in and kJ/mm.
- CWI study plan builder: week-by-week scheduleA week-by-week CWI plan for Parts A, B and C from your exam dates and hours.
- Free CWI Part A flashcards: 77 cardsFlip original cards on processes, symbols, NDE, discontinuities and formulas, and track what you know.
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Free 10-question check
See which topics to fix first. Free, with every answer explained.
Boom Angle
Practice tests and drills
3 resourcesCheck yourself on questions, symbols and code look-ups, then see what to fix.
- Load chart practice: 10 problems on a practice chartRead capacities off 10 invented load charts and check every answer.
- Load chart interpolation drill | Boom AnglePractice in-between radii on an invented chart and see why the longer radius wins.
- Crane hand signals drill: the 19 standard signals, scoredDrill crane hand signals until you know them on sight.
Tools and calculators
13 resourcesRun the math your exam asks for and get the answer in seconds.
- Net capacity worksheet: subtract every deduction, step by stepTake gross chart capacity down to net, one deduction at a time.
- Sling capacity calculator: choker, basket, bridleGet sling capacity by hitch and angle, and the load on each leg.
- Load weight calculator: plate, pipe, bar, blockEstimate plate, bar, pipe or block weight in lb, kg and tons, rigging included.
- Pick point load share calculator | Boom AngleSplit a load between two pick points from its center of gravity, with sling tension at each.
- Crane percent of capacity calculator | Boom AngleFree crane percent of capacity calculator: enter your chart capacity, load, rigging and deductions to see percent used and flags at your own marks.
- Sling angle calculator: leg tension and load angle factorSee how sling angle drives leg tension and load factor.
- Outrigger pad size calculator for crane matsFind ground pressure under an outrigger and the mat size that brings it down.
- Crane power line clearance: OSHA distancesLine voltage to the OSHA minimum clearance for crane work or travel, and a check of your planned approach.
- NCCCO certification cost calculator: crane operator written, practical and retakesTotal your NCCCO Core, specialty and practical fees plus retakes, with your own prep and travel added.
- NCCCO recertification window calculator | Boom AngleSee when your 12-month NCCCO recertification window opens and whether your hours replace the practical exam.
- Crane radius and boom angle calculatorSolve for boom angle, boom length or radius.
- Crane parts of line calculatorFind the minimum parts of line for a lift.
- NCCCO Core study plan: week-by-week scheduleA week-by-week NCCCO Core plan weighted by the four exam domains, from your exam date and hours.
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Free 10-question check
See which topics to fix first. Free, with every answer explained.
Long Seam
Practice tests and drills
2 resourcesCheck yourself on questions, symbols and code look-ups, then see what to fix.
- API 510 damage mechanism quizFree API 510 damage mechanism quiz: 18 original scenarios on the 15 API RP 571 mechanisms on the current exam sheet, every answer explained.
- API 510 lookup drill: find the section or table on a clockFind API 510 and ASME VIII-1 sections on a clock against a target pace you set, five questions for the open-book part.
Tools and calculators
13 resourcesRun the math your exam asks for and get the answer in seconds.
- Remaining life and inspection interval calculator, with the method explainedGet remaining life and the next inspection interval from one corrosion rate.
- Inspection interval calculator: API 510 and API 570Find the next inspection date from half the remaining life and the 10-year vessel cap.
- Corrosion rate calculator: short-term and long-term ratesTurn thickness readings into short- and long-term corrosion rates in seconds.
- Static head calculator: liquid pressure between two elevationsAdd the static head of a liquid column to vessel pressure.
- MAWP and minimum thickness calculator: shells and 2:1 headsWork MAWP and required thickness for shells and heads.
- Pipe minimum thickness calculator (B31.3, API 570)Get pipe wall thickness from pressure, then the margin left on a measured reading.
- Piping hydrotest pressure calculator: B31.3 hydrostatic and pneumatic leak testFree B31.3 piping hydrotest and pneumatic test pressure calculator for API 570 study: 1.5 × P × stress ratio, the 6.5 cap, a yield check and every step.
- Hydrotest pressure calculator: UG-99 and UG-100 test pressureGet hydrostatic test pressure under UG-99 or UG-100.
- API 510 eligibility checker and exam windowsSee whether you appear eligible for API 510 now, or when, and the next test windows with deadlines.
- API recertification window calculatorSee when your API 510, 570 or 653 recertification window opens, when the grace period ends and what the 3- and 6-year renewals need.
- API 510 and 570 study plan: weekly scheduleBuild a week-by-week API 510 or API 570 study plan from your exam date and weekly hours, across the five Body of Knowledge sections. Print it, then check.
- API 510 and 570 exam cost calculator (2026 fees)Total your API 510 or 570 exam fee as a member or non-member, with your own retakes, books, prep and travel added.
- Thickness survey analyzer: corrosion rate and remaining life across many readingsPaste a whole thickness survey and get every point's rate and life, the governing point and the next date.
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Free 10-question check
See which topics to fix first. Free, with every answer explained.
Angle Beam
Practice tests and drills
4 resourcesCheck yourself on questions, symbols and code look-ups, then see what to fix.
- Penetrant testing quiz: PT Level 2 practice18 PT Level 2 practice questions on indications and technique, every answer explained.
- UT Level 2 quiz: free ultrasonic practice18 UT Level 2 practice questions on physics, calibration and beam geometry, every answer explained.
- NDT math practice: Level 2 drillTen fresh UT math problems a set, from wavelength to skip distance, with every step shown.
- MT Level 2 quiz: magnetic particle practiceFree MT Level 2 quiz: 18 original magnetic particle questions on field direction, current, particles, demagnetizing and indications, each answer explained.
Tools and calculators
8 resourcesRun the math your exam asks for and get the answer in seconds.
- Skip distance calculator (angle beam, full and half skip)Half and full skip for any probe angle and thickness.
- Snell's law calculator: refracted angle and critical anglesRefracted and critical angles across any two materials.
- dB gain and amplitude ratio calculatorConvert dB gain, amplitude ratio and screen height in one place.
- UT beam calculator: near-field length, beam spread and wavelengthNear field, beam spread and wavelength for your probe.
- Acoustic impedance calculator for UT: Z, R and TDensity and velocity to Z, the share of intensity reflected and transmitted each way, and the dB loss.
- Ultrasonic thickness calculator: thickness, velocity and transit timeFree ultrasonic thickness calculator: thickness, velocity or transit time from T = V × t ÷ 2, with zero offset, two-point calibration and a velocity fix.
- Magnetic particle amperage calculator: coil, head shot and prodsMagnetizing current for coil, head shot and prod setups.
- NDT study plan builder (UT, MT, PT)A week-by-week UT, MT or PT plan from your exam date and hours, built on the ASNT topic list for your date.
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Free 10-question check
See which topics to fix first. Free, with every answer explained.
Rafter Tie
Practice tests and drills
2 resourcesCheck yourself on questions, symbols and code look-ups, then see what to fix.
Tools and calculators
7 resourcesRun the math your exam asks for and get the answer in seconds.
- IRC stair riser and tread check: 2021 vs 2024 limitsCheck risers and treads against the 2021 and 2024 IRC side by side.
- IRC egress window requirements: 2021 vs 2024 checkCheck egress window area, height and width against both IRC editions.
- Rafter length calculator: run, pitch and overhangRun, pitch and overhang to common rafter length, ridge deduction, rise and cut angles.
- ICC B1 study plan builder: your exam dateA week-by-week ICC B1 plan weighted by the seven outline areas, from your exam date, hours and weak spots.
- Which ICC inspector exam? B1, B2 or R5Say what you want to inspect and what you hold, and get the ICC exam to start with, the exams left and their list cost.
- ICC exam cost calculator: fees, retakes and total budgetTotal your ICC exam fees, retakes and test-center premium, with your own code books and prep added.
- IRC guard and handrail check: height, opening and trigger testsCheck when a guard is required, its height and openings, and stair handrail height, against both IRC editions.
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Free 10-question check
See which topics to fix first. Free, with every answer explained.
Toe Board
Practice tests and drills
1 resourceCheck yourself on questions, symbols and code look-ups, then see what to fix.
Tools and calculators
8 resourcesRun the math your exam asks for and get the answer in seconds.
- CHST study plan builder: week-by-week scheduleA week-by-week CHST plan weighted by the four blueprint domains, from your exam date and hours.
- Free CHST flashcards: 58 cards, no signupFlip original cards on 1926 subparts, formulas and hazard controls, and track what you know.
- Fall clearance calculator for personal fall arrestAdd free fall, deceleration and D-ring shift to see the clearance a fall arrest system needs.
- Ladder angle calculator: 4 to 1 rule and lengthLanding height to the 4 to 1 base distance, the 75.5 degree angle and the ladder length to buy.
- Trench sloping calculator: OSHA soil type slopesPick the soil type and depth to get the OSHA maximum slope, angle and top width of the trench.
- OSHA incident rate calculator: TRIR, DART, LTIRHours and case counts to TRIR, DART, lost time and severity rates, with every step shown.
- Noise dose calculator: OSHA dose and 8-hour TWAUp to six sound levels and hours to the noise dose (sound from 80 dBA counts) and 8-hour TWA, with each row worked.
- Scaffold tie calculator: 4:1 ratio and tie spacingHeight, base width and length to the 4:1 ratio, the first tie height, tie levels, ties per level and 4x capacity.
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Free 10-question check
See which topics to fix first. Free, with every answer explained.
Bonding Jumper
Practice tests and drills
2 resourcesCheck yourself on questions, symbols and code look-ups, then see what to fix.
- Texas electrician calculations practiceTen fresh Texas electrician calculation problems a set, from Ohm's law to voltage drop and the 125% rule, with every step shown.
- Texas journeyman lookup drill: 2026 NEC on a clockFind 2026 NEC tables and sections on a clock against a target pace you set, five questions for the Texas journeyman exam.
Tools and calculators
5 resourcesRun the math your exam asks for and get the answer in seconds.
- Ohm's law calculator: V, I, R, P, 3-phaseEnter any two of volts, amps, ohms and watts, or work three-phase power with power factor, formulas shown.
- Series and parallel resistance calculator with stepsResistor values to total resistance in series, parallel or both, then total current and the voltage across each resistor, every step shown.
- Transformer calculator: kVA to amps, turns ratiokVA to primary and secondary amps, single- or three-phase, plus kVA from volts and amps and turns ratio, every step shown.
- Texas journeyman study plan: week by weekA week-by-week Texas journeyman plan weighted by the ten PSI subject areas, from your exam date and hours.
- Voltage drop calculator: 1-phase and 3-phaseVolts and percent drop for a single- or three-phase run, and the smallest size that holds your target.
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Free 10-question check
See which topics to fix first. Free, with every answer explained.
Bid Bond
Practice tests and drills
3 resourcesCheck yourself on questions, symbols and code look-ups, then see what to fix.
- NASCLA plan-reading drill: three practice sheetsRead three original practice sheets and answer 30 questions on scale, takeoff, schedules, wall layers and cut and fill.
- NASCLA plan-reading drill 2: three more sheetsThree more practice sheets, foundation, roof framing and ceiling plans, with 30 questions on takeoff, schedules and conflicts.
- NASCLA plan-reading drill 3: section, site, powerA building section, a site utility plan and a power and sprinkler plan, with 30 questions on takeoff, inverts and conflicts.
Tools and calculators
16 resourcesRun the math your exam asks for and get the answer in seconds.
- NASCLA study plan builder: week-by-week scheduleA week-by-week NASCLA Commercial plan weighted by the twelve subject-area question counts, from your weeks and hours.
- Free NASCLA flashcards: 40 cards, no signupFlip original cards across the twelve NASCLA subject areas, with formulas and where-to-look cards, and track what you know.
- NASCLA reference finder: which book to openRead a job situation and pick which of the 24 listed references to open first, with the reason each time.
- Markup and margin calculator for contractor bidsDirect cost and overhead to a bid price, with the profit shown as both a markup and a margin.
- Concrete yardage calculator for slabs and footingsSlab and footing sizes to cubic yards, plus your waste allowance, divided by 27 step by step.
- CMU block calculator: blocks for a wallWall area less openings to a block count from the nominal face, plus waste and a course check.
- Roofing squares calculator with pitch factorPlan area and pitch to roof surface, squares, waste and bundles, with the pitch factor shown.
- Retainage calculator for progress billingWork completed and stored materials to retainage held, retainage released and the payment due.
- Board feet calculator for lumber takeoffsA lumber list by nominal size to board feet per line, the total with waste, MBF and the cost.
- Cut and fill calculator: average end area methodStations and end areas to cut, fill and net volume in cubic yards by the average end area method.
- CPM float calculator: critical path, total and free floatActivities, durations and predecessors to early and late dates, total and free float and the critical path.
- Break-even calculator for contractorsFixed overhead and gross margin or markup to break-even revenue, target revenue and margin of safety.
- Drywall sheet calculator for walls and ceilingsWall and ceiling area less openings, plus waste, to whole sheets of gypsum board for your sheet size.
- Overhead rate calculator for contractorsAnnual overhead over direct cost or labor to an overhead rate, the markup that recovers it and a job bid.
- Over and under billing calculator (WIP)Contract value, estimated cost, cost to date and billings to percent complete, earned revenue and over or under billing.
- Bonding capacity estimator for contractorsWorking capital, net worth and your own surety rule of thumb to rough single job and aggregate figures.
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Free 10-question check
See which topics to fix first. Free, with every answer explained.