About

Daytoolz is a set of free tools for the sums people actually have to do: an EMI before walking into a bank, a PPF maturity before filling a form, a BMI at a check-up, a PDF to merge before an application closes.

How it works

Every tool runs inside your browser. When you type a loan amount, the arithmetic happens on your own phone or computer; nothing is sent to a server, and there is nothing for us to store. When you merge a PDF or shrink a photo, the file is opened by the page itself and never leaves the device.

Five tools do need the internet, because the answer lives somewhere else: a currency rate, a bank's IFSC code, a PIN code, an RTO and a GST number. Those send only what you type in the box, and nothing else.

Where the numbers come from

Each tool shows the formula it uses, in words and as a formula, so you can check the working rather than trust a black box. Figures that change, such as scheme interest rates and tax slabs, are not written into the code: they live in data files with the source and the date they were taken from, and every page that uses one shows both.

A worked example on each page is produced by the same calculation the tool runs, so the words and the calculator can never drift apart.

When a result looks wrong

Tell us. A wrong number is the worst thing this site could do, so a report is treated as urgent: every one is answered, and a confirmed error is fixed and noted in that tool's changelog. Write to us through the contact page.

Who runs it

Daytoolz is operated by ThinkNext Innovations Pvt Ltd.

You can also read how we check our tools.