Free Online Calculators
Calculator Hub brings together 83 free online calculators for everyday life, finance, mathematics, physics, chemistry, IT and health, published in six languages. Results update as you type, with no account and nothing to install.
Every calculator page states the formula it uses, a worked example and — where a rate can change, such as tax — the official source behind the number. The values you enter stay in the URL, so a calculation can be shared or bookmarked as-is.
Browse by category
- Economy/FinanceFree finance calculators for compound and simple interest, loan repayments, stock average price, ROI, US sales tax, currency conversion and profit margin.
- PhysicsPhysics calculators for electricity, motion and mechanics: resistance, voltage, current, power, speed, acceleration, energy, force, pressure and waves.
- MathFree math calculators for volume, triangles, percentages, fractions, plane figures, statistics, prime factors, permutations and logarithms.
- SportsSports statistics calculators for baseball, basketball, soccer and general sports: batting average, ERA, OPS, FG%, pass rate and running pace.
- LifeEveryday life calculators for discounts, tips, dates and time, BMI, daily water intake and US lottery tax.
- ITIT and web calculators for CSS px-to-rem conversion, data sizes, aspect ratios, HEX/RGB colours, print DPI and download time.
- ChemistryChemistry calculators for moles and molar mass, molarity, pH and pOH, the ideal gas law and dilution (C1V1 = C2V2).
Popular calculators
Frequently asked questions
Is Calculator Hub free?
Yes. Every calculator is free and needs no account. The site is funded by advertising rather than subscriptions.
Do I need to install anything?
No. The tools run in the browser, and each page is pre-rendered at build time, so it opens quickly even on a slow connection.
Why does a tax result differ from what I actually pay?
The calculators apply a standard national or state rate. Surcharges, deductions, local rules and filing status can all change the final amount — check the official source linked under the calculator.
Are my inputs stored?
Values are kept in the URL of the page you are on so the link can be shared. We do not store calculation history on a server.