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Free Calculators and Converters

An extensive collection of free, highly-rated online calculators and converters covering finance, construction, education, health, cooking and math for everyday use.

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Financial Calculators

A suite of financial calculators to assist with projections for savings, investments, loans, mortgages and small business calculations.

Featured Conversions

A series of individual converters for popular weight, length, height, area and energy units.


A small collection of health calculators, from BMI and BMR through to pregnancy and exercise.

Handy and Fun

A collection of handy calculators for DIY construction projects as well as math calculators and a selection of tools for calculating dates.

Cooking Calculators

A suite of recipe calculators to help you with converting between metric and imperial units when baking or cooking.

Unit Conversions

A series of unit converters for area, energy, fuel consumption, length & distance, volume, weight and more.

Featured Articles

Maximizing Your Investments: Understanding Compound Interest

In the realm of personal finance, few concepts wield as much power and promise as compound interest. Often hailed as the 'eighth wonder of the world' by investment gurus, its ability to exponentially grow wealth over time is unparalleled. Yet, despite its significance, compound interest remains a ne...

Strategic Budgeting and Forecasting with Financial Calculators for Small Businesses

In the dynamic world of small business, financial agility and foresight are not just virtues but necessities for survival and growth. Strategic budgeting and forecasting emerge as the twin pillars supporting this financial acumen. However, navigating these complex territories often poses a significa...

Compound Interest Formula - Explained

An in-depth look at the compound interest formula as we break down how to calculate compound interest. The concept of compound interest is that interest is added back to the principal sum so that interest is earned on that added interest during the next compounding period.

Are the calculators on our site free to use?

Yes, all the online calculators on The Calculator Site are free for you to use at your convenience. Our website is funded by the advertising we feature on our pages.

We hope you find our calculators useful. You can learn more about The Calculator Site and the causes we support (tree planting) on our about page.