Free Online Calculators & Tools Hub
Fast, accurate calculators for finance, health, and planning. Built for everyone — simple steps, instant results, and no sign-ups.
⚠️ Advisory only: Information is for guidance and education. We don’t provide legal, immigration, medical or financial representation; decisions are yours.
Pick a Calculator & Get Instant Results
Every tool is lightweight, mobile-friendly, and clearly explains the math. Your inputs stay in your browser — no data storage.
All Free Calculators
(Each tool page includes formulas, tips, and examples.)
Why Use DiuMitra Calculators?
Instant & lightweight
Results update as you type; no account required.
Accurate & transparent
We show assumptions and the math behind the result.
Metric & imperial
Toggle units (kg/lb, cm/in, £/%/€) where relevant.
Mobile-first
Designed to work beautifully on phones and tablets.
Privacy-friendly
Inputs stay in your browser; we don’t store your data.
How It Works – 3 Quick Steps
Choose a calculator above.
Enter your values and pick units.
Read the instant result, then explore the worked example.
How to use these calculators
How the Calculations Work
Our tools use widely accepted, standard formulas. Every calculator page explains the equation, variables, and a worked example so you can trust the result and understand the “why”.
Formulas Used – Quick Look
- Finance & Money
- Loan/Mortgage Payment (PMT):
PMT = r × PV / (1 − (1 + r)^−n) - Compound Interest (Future Value):
FV = P(1 + r/m)^(m·t) + PMT × ((1 + r/m)^(m·t) − 1) / (r/m) - ROI:
(Return − Cost) / Cost - DTI:
Monthly debt payments / Gross monthly income - VAT: Add →
Net × (1 + VAT)• Remove →Gross / (1 + VAT)
- Loan/Mortgage Payment (PMT):
- Health & Lifestyle
- BMI (metric):
BMI = kg / m² - BMI (imperial):
BMI = 703 × lb / in² - Daily Calories (TDEE):
BMR × activity factor(BMR via Mifflin-St Jeor)
- BMI (metric):
Each tool page shows the full method, variables, and example specific to that calculator.
Tools Hub – FAQs
What Our Clients Say About Tools
This estimator feels like a mini financial advisor. It’s incredibly helpful for first-time buyers to understand their limits. The income-to-debt ratio logic is spot on.
This tool is a lifesaver for budgeting. It’s intuitive and gives a clear breakdown of monthly payments. I especially like the amortization summary—it’s great for planning long-term.
Simple, fast, and accurate. The BMI Calculator gives instant results with clear health categorization. I appreciate the clean layout and mobile responsiveness—it’s perfect for quick checks on the go
Check Out Our Other Services
Helpful if you need guidance beyond the numbers.
Community & Support: Gujarati/हिंदी help available. See our Community Directory and About Us to learn how we support the Diu diaspora.
⚠️ All services are offered on an advisory basis only. We do not act as legal, immigration, or financial representatives, and we do not guarantee outcomes. Any actions or applications taken based on our guidance are the sole responsibility of the individual. We connect you with relevant resources and trusted providers where possible, but all arrangements and submissions remain your responsibility.