12 calculators
Free online utilities for software engineers, web developers, and sysadmins: calculate IPv4 CIDR subnet ranges, estimate file bandwidth download times, convert color spaces, format JSON, test regular expressions, and forecast LLM API costs.
Choose the calculator that matches your question, enter current values, and compare a few realistic scenarios. Results are based on the inputs and method shown by each calculator, so important financial, tax, health, and legal decisions should always be checked against current official information.
Start with the tool that matches your goal, then use related calculators to compare alternatives or validate the result.
The math follows the displayed inputs and formulas. Real-world outcomes can vary with changing rates, rules, fees, rounding, and provider-specific terms.
