Calculator tools
Fast online calculators for percentages, units, aspect ratios, color contrast, time zones, and everyday work math. Use them instantly with no signup.
12 ready tools
Runs locally
No signup
Searchable
12 calculator tools
Aspect Ratio CalculatorCalculate image and screen ratios locally.Open tool
Color Contrast CheckerCheck WCAG color contrast locally.Open tool
Percentage CalculatorCalculate percentages locally.Open tool
BMI CalculatorCalculate adult BMI locally.Open tool
Age CalculatorCalculate age between dates locally.Open tool
Tip CalculatorCalculate tip and split locally.Open tool
Date Difference CalculatorCalculate days between dates locally.Open tool
Discount CalculatorCalculate sale price locally.Open tool
VAT / Sales Tax CalculatorAdd or remove tax locally.Open tool
Unit ConverterConvert common units locally.Open tool
Time Zone ConverterConvert meeting times locally.Open tool
AI Cost CalculatorCalculate custom AI token costs locally.Open tool
Guide
About calculators
Calculator tools cover everyday work math: percentages, units, aspect ratios, time zones, and accessibility checks.
They are intentionally fast and focused, so you can get an answer without setting up a spreadsheet or account.
FAQ
Calculator tools FAQ
Are the calculators free?
Yes. Utilumo calculators are free to use and do not require an account.
Do calculator results get stored?
No. Calculator input is handled in the browser tab and is not saved by Utilumo.
Learn
Learn about Calculator
Short explanations and guides behind these tools.
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Related categories
Category pages help you move sideways when the next task is close to the one you came for.