Free online calculators — finance, date and unit

Percentage, loan, BMI, tip, age and unit converters — instant browser calculators.

Spreadsheets are overkill for one-off math. Tentaco Calculator Studio runs deterministic formulas locally — copy results into emails, slides or homework without formula errors.

All calculators work without sign-up and respect your input privacy.

Key terms

Percentage and tip calculators
Loan and savings planners
Date difference and age
Unit conversion
Inflation purchasing power

Tool guides

Percentage Calculator — percent change online
Tip Calculator — split bill and tip percent
Loan Calculator — monthly payment estimate
Unit Converter — metric imperial length weight
Age Calculator — exact age from birthdate

Related collections

Productivity & everyday calculators
Education & learning tools
Unit converters — length, weight, temperature and more
Productivity timers — Pomodoro and focus sessions

Frequently asked questions

Are results stored?

No — calculations run in your session only.

Financial advice?

Calculators are educational — consult professionals for decisions.

Mobile friendly?

Yes — responsive layouts work on phones.

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