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Calculators, AI generators, and everyday utilities. Everything runs in your browser — instant results, no account required.

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Popular tools

Most useful tools — free, instant, no account needed

AI LinkedIn Summary Generator

Generate a professional LinkedIn About section in seconds using AI.

AI Instagram Caption Generator

Write engaging Instagram captions for any photo or post instantly.

Find your exact age in years, months, days and hours instantly.

Calculate your Body Mass Index in metric or imperial units.

Loan Repayment Calculator

Calculate your exact monthly loan payment for any loan amount.

Compound Interest Calculator

See how your savings or investments grow over time with compound interest.

Password Generator

Create strong, secure passwords instantly with custom options.

Salary After Tax Calculator

Estimate your real take-home pay after taxes and deductions.

Retirement Savings Calculator

Find out if you are saving enough to retire comfortably.

Percentage Increase Calculator

Calculate percentage change between any two numbers instantly.

Random Number Generator

Generate random numbers within any range instantly.

Fake Name Generator

Generate a complete random identity for testing and privacy.

Guides

Plain-language explanations of the maths behind our tools

How to calculate percentage increase

The formula, worked examples and the mistakes most people make.

How compound interest works

Why time matters most, the rule of 72 and how debt compounds too.

How loan payments work

The payment formula, amortization and what changes the total cost.

How to create a strong password

How passwords get cracked and a simple system to stay safe.

What your Body Mass Index means and where it falls short.

How to write a LinkedIn summary

A simple structure, strong opening lines and a checklist.

Why use ToolsByValhalla?

ToolsByValhalla brings together free online calculators, generators and AI writing tools for everyday tasks, from working out your exact age or a loan payment to creating a secure password or a LinkedIn summary. Every calculator explains the formula it uses with a worked example, so you can trust the result and learn how it works. The tools run in your browser, which makes them fast and private: the numbers you enter stay on your device. There is nothing to install and no account to create.

Start with the full list of tools, read a guide, or learn more about us.