All Utilities Tools
Business Days Calculator
Count business days between dates or add/subtract work days. Optionally exclude US federal holidays. Free, instant, no signup.
Energy Bill Reducer Estimator
See how much you can save with energy efficiency upgrades
Food Waste CO₂ Calculator
Calculate how much CO₂ and money your household wastes from discarded food each year
Hours Between Times Calculator
Calculate hours and minutes between any two times instantly — free, private, no signup
Personal Carbon Footprint Calculator
Estimate your annual CO₂ emissions from transport, home energy, diet, and shopping
Snow Day Probability Calculator
Estimate the chance your school will close due to snow. Enter weather conditions and school details for an instant probability estimate.
WiFi QR Code Generator
Generate a scannable QR code to share your WiFi password — no app needed
Utilities on FastTools are free, browser-based tools designed to help you get quick answers without signups or downloads. Every calculator runs entirely in your browser — your data never leaves your device.
Whether you're planning, budgeting, or just curious, these tools are built to be fast, accurate, and private. Pick any tool below to get started instantly.
Frequently Asked Questions
Are these utilities free?
Yes, every tool is completely free to use with no signup, no account, and no hidden fees.
Is my data safe?
Absolutely. All calculations run locally in your browser. No data is sent to any server or stored anywhere.
Do I need to create an account?
No. Every tool works instantly with no registration required. Just open and start using.