Free Online Calculators
for Everything
Fast, accurate calculators for AI costs, percentages, tips, BMI, loans, investments, and unit conversions. No signup required. Instant results.
All Calculators
AI Cost Calculator
Compare token costs across OpenAI, Anthropic, and Google AI models. Calculate monthly API spending for GPT-4o, Claude, Gemini, and more.
Percentage Calculator
Calculate percentages instantly. Find X% of Y, what percent X is of Y, or the percentage change between two numbers.
Tip Calculator
Calculate the perfect tip and split the bill between friends. Choose preset percentages or enter a custom tip amount.
BMI Calculator
Calculate your Body Mass Index using height and weight. Supports imperial and metric units with BMI category and healthy range.
Compound Interest Calculator
See how your investments grow over time with compound interest and monthly contributions. Interactive growth chart included.
Loan Calculator
Calculate monthly payments, total interest, and total cost for any loan. Visual pie chart shows principal vs. interest.
Unit Converter
Convert between units of length, weight, temperature, volume, area, and speed. Supports metric, imperial, and more.
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Instant Results
All calculations happen in your browser. No server requests, no waiting.
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No signup, no premium tier, no limitations. Every calculator is 100% free.
Mobile Friendly
Works perfectly on any device. Calculate on the go from your phone or tablet.