Free Online Calculators & Tools
60 free calculators and online tools for money, health, math and everyday tasks
Calculators and tools for finance, health, math, images, text and networking. Every one shows its formula, so you can check the answer yourself.
Scientific Calculator
Degrees or radians, memory, history and a full function set. Type on your keyboard or use the keys.
Free Calculators and Online Tools in One Place
What is here, and why it is worth using it here.
Numbers On Your Tip is a hub of free online calculators and tools for the questions that have one correct answer. The calculators cover five areas. Finance handles repayments, income tax, VAT and what a mortgage costs over its full term. Health runs from BMI and body fat through to infusion rates and creatinine clearance, with a pharmacist's review date on the clinical ones. Math works percentages, fractions, matrices and averages and writes out the steps. Daily use takes on the arithmetic with awkward edges — leap years, exact ages, tips that differ by country, a bill nobody split evenly. And construction works out how much material a job takes in the units a supplier sells in.
The other half of the site is tools rather than sums. There is an image converter, a compressor and a resizer; text tools that count words, change case and generate placeholder copy; a password generator; a currency converter and a time zone converter; and networking checks for your IP address, DNS records, domain availability and connection speed.
All of it runs in your browser. There is no sign-up, nothing you type is sent anywhere, and every calculator prints the formula it used so you can check the result by hand instead of taking it on trust. Maths you can verify beats maths you have to believe.
Most Used Calculators and Tools
The questions people open this site to answer.
All 60 Free Calculators and Tools by Category
Every tool on the site. None of them needs an account.
Health calculators for body composition and clinical dosing, from BMI and body fat to infusion rates and creatinine clearance. The medical ones carry a pharmacist's review date.
Finance calculators for the money questions that have an exact answer: monthly repayments, income tax, VAT, net worth, and what a mortgage really costs across its full term.
Daily use calculators for the arithmetic that turns out to have edge cases — dates across leap years, exact ages, tips by country, discounts, and splitting a bill nobody shared equally.
Construction calculators for ordering materials without guessing: how much mulch or gravel a bed takes, worked in the units a supplier actually sells in.
Free online tools that run entirely in the browser — convert, compress and resize images, generate passwords, count words, pick colours and change text case.
Math calculators that show their working: percentages, fractions, matrices, averages and the quadratic formula, each with the steps written out rather than just an answer.
Networking tools that check what a connection reveals — your IP address, DNS records, email validity, domain availability and connection speed.
Popular Calculators in the US, UK, Canada and Australia
Where a calculator is written around one country's rules, it says so here.
United States
Federal brackets, US tipping norms and imperial units throughout.
United Kingdom
VAT at 20%, the personal savings allowance and the £500,000 stamp duty cliff.
Canada
Amortisation and everyday splits; sales tax varies by province, so check yours.
Australia
Metric units by default, and conversions when a figure arrives in imperial.
How This Site Works
Three things that are true of every calculator here.
Nothing is kept
Calculations run in your browser and nothing you type is stored, which is why there is no account and nothing to delete.
The working is shown
Each calculator sets out the formula it used and a worked example, so you can check the result by hand rather than take it on trust.
Written, not generated
The guides behind the tools explain where each number comes from, and carry a review date so you can see when they were last checked.