Free Online Calculators
Some questions just need a quick, trustworthy number: what's the monthly payment on this loan, how many days until that deadline, what's 18% of this total, how many kilometres is that. Our calculators answer them instantly and accurately, without the ad-choked interfaces that plague most calculator sites. This guide gathers them in one place so you can find the right one fast.
All calculators tools
Guides & tutorials
Percentage Calculator Formula: Formulas and Worked Examples
Learn the percentage calculator formula for percentages of a number, percentage increase and decrease, and percentage difference with clear worked examples.
5 min readUnit Conversion Made Simple: Metric, Imperial, and Everything Between
A practical guide to converting length, weight, temperature, and more — the formulas worth knowing, the conversions people get wrong, and a free tool that does it all.
6 min readHow to Calculate Your Loan EMI (With Worked Examples)
Understand exactly how a loan or mortgage monthly payment is worked out, what drives the total interest you pay, and how to model it all instantly for free.
5 min readHow to Calculate Your Exact Age in Years, Months, and Days
Working out an exact age is trickier than it looks, thanks to leap years and uneven months. Here's how age calculation really works and how to get an exact answer instantly.
5 min readPercentage Calculator Online: A Practical Guide With Examples
The four percentage problems that cover almost everything — percent of a number, percent change, and adding or subtracting a percentage — explained with real examples.
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