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Popular tools
Useful calculators and tools, free, fast, and ready in seconds.
AI Token Calculator
Estimate token counts for prompts, responses, and AI workflows before sending them to an API.
API Cost Calculator
Estimate API usage costs from requests, tokens, pricing, and monthly volume.
EMI Calculator
Calculate monthly EMI, total interest, and total repayment for a loan in seconds.
Compound Interest Calculator
Estimate how savings or investments grow with interest, deposits, and time.
Unit Converter
Convert common units for length, weight, temperature, volume, area, speed, and more.
Password Generator
Create strong, random passwords for safer accounts and better security.
Latest articles
Simple explanations, formulas, and practical guides to help you understand the numbers behind every calculation.
How to Calculate Percentages: A Complete Guide With Real Examples
Master percentages once and for all. Learn the core formulas, percentage change, reverse percentages, and the mental-math shortcuts professionals use daily.
APR vs APY Explained: What's the Difference?
APR and APY look similar but measure interest very differently. Learn the formulas, when each is used, and how to compare loans and savings accounts correctly.
Mean, Median, Mode, and Range Explained
Four measures that describe a dataset in different ways. Learn when each one tells the truth, when it lies, and how to pick the right one for the question.
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