Dentaku – Smart, Free Online Calculators for BMI, Loan, Age & More in Japan
Use Dentaku’s free online calculators for BMI, loans, GPA, age, and more. Accurate, mobile-friendly, and ad-free tools built
for Japan’s daily needs.
12+
Calculator Tools
99.9%
Accuracy Rate
24/7
Available
100% Secure
Instant Results
Japanese Language
Calculator
Dentaku – Your Smart, Simple, and Free Online Calculator Hub
Looking for a reliable online calculator that’s fast, accurate, and completely free? Welcome to DentakuHub, your all-in-one solution for everyday calculations—from health metrics and age tracking to business planning and scientific math. Whether you're a student crunching numbers, a parent planning birthdays, or a business owner calculating margins, Dentaku is built for you.No ads. No sign-ups. No nonsense.
Just open a tool, enter your data, and get your results. Instantly.
What You Can Do with Dentaku
We offer 12 easy-to-use calculators designed for real-life needs. Here’s what you can explore:
BMI Calculator
Check your body mass index based on your height and weight. Instantly see if you fall into underweight, healthy, or overweight categories—all based on standard health ranges.
Age Calculator
Want to know someone’s exact age? Dentaku lets you find out in years, months, days—even minutes! Ideal for official documents, birthday planning, or pure curiosity.
Pregnancy Calculator
Expecting a baby? Just enter your LMP (last menstrual period) and we’ll show you the estimated due date, trimester info, and what’s happening with the baby week by week.
Interest Calculator
Choose simple or compound interest and get your exact returns. Whether it’s for investments, savings, or loans — we’ve got you covered.
Loan Calculator
Thinking about a new car, home, or personal loan? Estimate your monthly payments and total interest with ease. This tool helps you plan ahead with confidence.
Volume Calculator
Need to calculate the volume of a cylinder, cone, or box? Perfect for students, interior designers, or shipping planners.
Accounting Calculator
For small business owners and sellers: calculate profit margins, markup percentages, break-even points, and more — fast.
Date Difference Calculator
Want to know how many days are between two dates? This tool helps with planning events, legal deadlines, and vacation timelines.
Time Duration Calculator
Calculate the time gap between two events — down to the hour or minute. Great for scheduling, work logs, or planning deadlines.
Percentage Calculator
Need to figure out a discount? Or check percentage increases/decreases? Use this clean tool for schoolwork, sales, or score analysis.
Fraction Calculator
Struggling with fractions? Add, subtract, multiply or divide them — and get clear, step-by-step answers. Great for students and teachers alike.
Scientific Calculator
Solve algebra, trigonometry, and square roots with high precision — all in your browser. Perfect for high school, university, or professionals needing a quick solution without bulky handhelds.
Who Made Dentaku?
Dentaku was created by Rizwan Khan, a passionate educator and developer. His goal?
To build a platform that’s simple, fast, private, and above all — helpful.
Rizwan has worked with students and professionals across Japan, building tools that make everyday tasks just a bit easier.
Why People Choose Dentaku
Dentaku is trusted across Japan — from Tokyo to Sapporo — by students, families, freelancers, and professionals.
How to Use Dentaku (It’s Easy!)
Open the calculator you need
Enter your numbers
Hit “Calculate”
Done!
Need to do another calculation? Just clear the inputs and go again. It’s built for speed.