Free Tools for A&P Students &
Aircraft Maintenance Technicians
Professional-grade calculators and reference tools. Free, fast, no login required.
Tool Categories
Calculations
Torque, bend allowance, and engineering calculations
6 toolsHardware Reference
AN/MS part number decoders and specifications
1 toolStudy Tools
A&P exam prep and knowledge checks
3 toolsConverters
Unit conversions: torque, dimensions, and more
2 toolsReference Tables
Abbreviations, bend radius tables, and quick-reference charts
2 toolsFeatured Tools
The most-used tools on the site
Torque Extension Calculator
Calculate the correct torque wrench setting when using an extension tool.
CalculationsBend Allowance Calculator
Calculate bend allowance, setback, and flat blank length for sheet metal work.
ConvertersTorque Unit Converter
Convert between in-lb, ft-lb, N·m, and kgf·cm with AN bolt reference table.
HardwareAN Hardware Decoder
Decode AN and MS aircraft hardware part numbers instantly.
CalculationsRivet Size Calculator
Calculate rivet diameter, edge distance, pitch, and grip length for sheet metal repairs.
CalculationsWeight & Balance Calculator
Calculate weight, moment, and CG location for aircraft weight and balance.
Why AMT Toolbox?
AMT Toolbox was built because aviation maintenance technicians deserve better tools. Whether you're prepping for your A&P written exam or need a quick torque calculation on the hangar floor, these tools are here for you — free, accurate, and always available. No subscriptions, no ads, no account required.