All Tools

Every free online calculator and converter on Toolkit, grouped by category.

💰 Finance

Loan Interest Calculator

Simulate equal principal and interest repayment

Currency Converter

Convert currencies with real-time exchange rates

Discount & Sales Tax Calculator

Sale price, stacked discounts and tax in one step

Compound Interest Calculator

Savings growth with monthly deposits and tax

Tip amount, total and split per person

💚 Health

Calculate international and Korean age at once

Check your body mass index and weight category

Due Date Calculator

Estimate due date from your last period

Calorie Calculator

Calculate BMR and daily calorie needs

📅 Date

D-Day Calculator

Count the days remaining until a specific date

Date Difference Calculator

Calculate days, months, and years between two dates

Public Holiday Lookup

Browse public holidays by year

Hijri to Gregorian Converter

Convert Islamic (Umm al-Qura) and Gregorian dates

Lunar Calendar Converter

Convert Gregorian and Chinese lunar dates, zodiac

Time & Hours Calculator

Hours between times, add time, total hours

Calendar Year Converter

Gregorian to Japanese era, Minguo, Buddhist year

✍️ Text

Character Counter

Count characters, bytes, with or without spaces

🔄 Convert

Convert between pyeong, m², and ft²

Convert length, weight, temperature, and speed

Percentage Calculator

X% of Y, percent change, increase and decrease

💻 Dev

QR Code Generator

Instantly turn URLs and text into QR codes

Indent, validate, and minify JSON

Base64 Converter

Encode and decode text to Base64

Color Converter

Convert HEX, RGB, and HSL color values

Password Generator

Generate secure passwords with custom options

Random Number Generator

Random integers in a range, unique or with repeats