Knowledge References
15 calculators. Every one runs in your browser. Free, no account.
Tools in this group
- Wire / Pipe / Gas Color Codes - NEC, IEC, gas piping, and ASME A13.1 conventions in plain English.
- Knot Reference - Common rigging and rescue knots with typical strength reduction.
- Inspection Prep Checklist - Per-trade rough-in and final inspection checklists.
- Utility Locator and Emergency Contacts - 811, poison control, OSHA, NRC, and 911 - universal US numbers.
- Tool Maintenance Intervals - Maintenance schedule for common trades tools.
- Hand Signal Reference - Crane, excavator, flagger, and aircraft marshalling signals.
- OSHA Top-10 Citations - Most-recently published OSHA top-10 most-cited standards.
- Lockout / Tagout Steps - Step-by-step LOTO procedure (29 CFR 1910.147 cited by section).
- Defensible Space Reference - Zone-based defensible space practice (CALFIRE / NFPA by name only).
- Storm Shelter Spec Reference - FEMA P-320 published guidance for residential storm shelters (by name only).
- Field First Aid Triage Quick-Read - START triage categories. Not medical advice; call 911.
- IRS Form Quick-Read Index - What each commonly used IRS form is for, in one paragraph each.
- State Sales Tax Nexus Quick-Read - Post-Wayfair economic-nexus thresholds by state with citation and verified-on date.
- OSHA Recordkeeping Quick-Read - 29 CFR 1904: who must keep records, recordable definition, Forms 300 / 300A / 301, posting period, retention.
- Lab Safety Quick-Read (GHS + Spill) - GHS pictograms with signal words and hazards.
Other trades
- Electrical - 236 calculators
- Plumbing and Gas - 141 calculators
- HVAC - 165 calculators
- Water Damage and Mold Restoration - 53 calculators
- Carpentry and Construction - 557 calculators
- Fire-Ground Engineering - 58 calculators
- Cross-Trade Utilities - 117 calculators
- Trucking and Logistics - 43 calculators
- Mechanic - Auto, Marine, Aviation - 154 calculators
- Agriculture and Forestry - 78 calculators
- Water and Wastewater Operations - 66 calculators
- Stage and Live Production - 40 calculators
- Kitchen and Food Service - 36 calculators
- Field, Backcountry, and SAR - 35 calculators
- Historical Reference Data - 1 calculators
- Accounting, Tax, and Small-Business - 31 calculators
- Bench Science and Laboratory Math - 27 calculators
- Real Estate - 35 calculators
- Educators and K-12 - 29 calculators
- Rigging and Heavy Lift - 33 calculators