Your Hub for Precision, Power, and Grit
Free online calculators and tools built for technicians, electricians, HVAC pros, and DIYers. All tools run in your browser - no sign-ups, no tracking.
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 →Productivity
Shift schedule generators, crew rotation visualizers, and business planning tools.
View Productivity Tools →Featured Tools
Jump right in - these tools are ready to use now.
Air Compressor Leak Calculator
Find out how much compressed air leaks cost your facility per year. Enter leak count, system pressure, and electricity rate to see CFM losses, kW waste, and annual dollars wasted.
Can I Run This On That?
Check if your circuit breaker and wiring can handle a specific appliance. Enter breaker size, wire gauge, and load wattage for a pass/fail verdict based on NEC standards.
Wire Sizing Calculator
Find the right AWG wire gauge for any electrical run. Enter amps, distance, and voltage to get NEC-compliant sizing with derating, voltage drop, and copper vs aluminum cost comparison.
Generator Sizing Calculator
What size generator do you need? Add your appliances and loads to calculate total running watts and starting surge. Get a recommended generator size with built-in headroom.
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 tracking scripts. Just open and use.
Whether you're an HVAC tech sizing a system, an electrician pulling wire, or a homeowner trying to understand your energy bills - there's a ToolGrit calculator built for you.