Your Hub for Precision, Power, and Grit
Free online calculators and tools built for technicians, electricians, HVAC pros, farmers, and DIYers. All tools run in your browser - no sign-ups, no ads, no data selling.
Built for the Trades
Practical tools organized by what you do.
HVAC
Heat load estimators, efficiency calculators, system analyzers, and ROI tools for HVAC professionals.
View HVAC Tools →Electrical
Wire sizing, load calculations, generator sizing, and NEC-based circuit compatibility checks.
View Electrical Tools →Industrial
Air compressor analysis, leak detection calculations, and energy loss estimators for industrial facilities.
View Industrial Tools →Safety
Lockout/tagout permit management and compliance documentation tools for maintenance teams.
View Safety Tools →Productivity
Shift schedule generators, crew rotation visualizers, and business planning tools.
View Productivity Tools →Agriculture
Grain storage, drying cost, auger sizing, fertilizer blending, irrigation, and power budget calculators for farmers.
View Ag Tools →Municipal
Chemical dosing, detention time, CT value, clarifier loading, and lagoon sizing tools for water and wastewater operators.
View Municipal Tools →Emissions
Fuel combustion, refrigerant leak, VOC coating, diesel sulfur, and Title V fee calculators for environmental compliance.
View Emissions Tools →Shops & Outbuildings
Heater sizing, voltage drop, snow load, well pump sizing, and machine shop power calculators for outbuildings and workshops.
View Shop Tools →Machinist
Speeds & feeds, chip load, tolerance fits, thread ID, taper angles, bolt circles, and material weight calculators for machinists.
View Machinist Tools →Woodworking
Wood feeds & speeds, board foot calculations, and CNC routing tools for woodworkers and cabinet makers.
View Woodworking Tools →Solar & Renewables
Solar array sizing, battery bank capacity, DC wire sizing, charge controllers, inverters, and ROI calculators for off-grid and backup systems.
View Solar Tools →Featured Tools
Jump right in - these tools are ready to use now.
Advanced Tap Drill Calculator
Calculate tap drill sizes for any thread engagement percentage (50-85%) with full drill cross-reference in fractional, number, letter, and metric systems. UNC, UNF, and Metric threads.
Thread Pitch Identifier
Identify unknown threads from caliper measurements. Cross-references UNC, UNF, Metric ISO, NPT, BSP, and ACME thread standards with tolerance matching and confidence scoring.
Weld Heat Input Calculator
Calculate weld heat input per AWS D1.1 and ASME Section IX. Enter amperage, voltage, and travel speed to get kJ/in and kJ/mm with process efficiency correction and risk tier classification by material type.
Belt Drive & Sheave Calculator
Calculate belt drive speed ratios, sheave diameters, belt speed in FPM, and approximate belt length. Includes V-belt cross-section reference with minimum sheave diameters.
Detention Time Calculator
Calculate hydraulic detention time for any basin, tank, or lagoon and check against regulatory minimums. Supports rectangular and circular tanks with dead zone correction for actual vs theoretical retention time.
Hourly Burden Rate Calculator
Calculate true hourly labor cost including wages, benefits, payroll taxes, insurance, overhead, and utilization rate. Essential for job costing and bid pricing in the trades.
Why ToolGrit?
ToolGrit exists because trade professionals deserve better tools. Not bloated apps that require accounts, not calculators buried behind paywalls, and definitely not tools that sell your data.
Every calculator on ToolGrit runs entirely in your browser. Your data stays on your device. No accounts needed. No ads or data selling. Just open and use.
Whether you're an HVAC tech sizing a system, an electrician pulling wire, a farmer planning grain storage, or a homeowner trying to understand your energy bills - there's a ToolGrit calculator built for you.