DIUMITRA TOOLS • UPDATED 2026

Free Online Calculators for Finance, Health & Planning

Use DiuMitra’s 21 free online calculators for mortgages, loans, salary, tax, savings, investments, health and everyday maths. Choose a tool below for instant calculations with clear inputs, formulas and examples. Every calculator link on this hub was checked as live on 16 August 2026, and no account is required.

Browse All Calculators Choose by Category

21 live calculator pages checked: 16 August 2026. Results are general estimates and should be checked against official or professional sources when a decision matters.

DiuMitra free online calculators for finance, health, savings and everyday planning

FIND THE RIGHT TOOL

Choose a Calculator Category

Start with the type of calculation you need. Each category links directly to a focused set of live calculator pages.

Which Free Calculator Should I Use?

Use this quick guide if you are not sure which calculator matches your question.

What you want to work out	Best starting category	Examples
Mortgage, loan or finance payments	Mortgages & Borrowing	Mortgage, DTI, car finance, loan payments
Pay, tax or VAT	Salary & Tax	Salary, income tax, VAT
Saving or long-term growth	Savings & Investment	Compound interest, investment, retirement, ROI
Body weight or calorie estimates	Health & Lifestyle	BMI, daily calories
Percentages or customer quotes	Business & Everyday Maths	Percentage, price quote

MORTGAGES & BORROWING

Mortgage, Loan & Borrowing Calculators

Estimate repayments, affordability, debt ratios and finance costs. These tools provide planning estimates, not lender decisions or personalised financial advice.

Mortgage Calculator

Estimate monthly mortgage repayments and total interest from loan amount, APR and term.

Mortgage Affordability Estimator

Estimate a house budget using property price, deposit, applicant income, APR and affordability assumptions.

Debt-to-Income (DTI) Calculator

Calculate your debt-to-income ratio to understand how monthly debts compare with gross income.

Loan Calculator

Estimate fixed-loan payments, total repayment and interest with an amortisation schedule.

Personal Loan Calculator

Model personal-loan repayments using the amount borrowed, APR and repayment term.

Car Loan Calculator

Estimate standard car-loan payments using vehicle price, deposit, APR and term.

Car Finance Calculator

Compare PCP, HP and lease-style costs, including the impact of deposits and balloon payments.

Home Equity Loan Calculator

Estimate available home equity and borrowing scenarios using property value and loan-to-value figures.

Payment Calculator

Calculate periodic payments for loans, leases or other financed amounts using rate and term.

SALARY & TAX

Salary, Income Tax & VAT Calculators

Use these calculators to explore pay, tax and VAT scenarios. Check official HMRC information before relying on an estimate for filing, payroll or tax decisions.

Salary Calculator

Explore gross, net and take-home pay scenarios from salary and working-pattern inputs.

Income Tax Calculator

Estimate deductions and take-home pay from gross income using the calculator’s stated assumptions.

VAT Calculator

Add or remove VAT from a price and compare VAT-inclusive and VAT-exclusive amounts.

SAVINGS & INVESTMENT

Savings, Investment & Retirement Calculators

Project different long-term scenarios for savings and investment growth. Assumed rates are illustrations only and do not predict future returns.

Compound Interest Calculator

Project compound growth from a starting balance, rate, time period and regular contributions.

Investment Calculator

Model future investment value using an initial amount, contributions, time horizon and assumed return.

Retirement Calculator

Estimate a retirement savings target, projected pot and potential shortfall from your assumptions.

Savings Goal Calculator

Work out the monthly saving needed for a target or project how a savings balance may grow.

ROI Calculator

Calculate return on investment from cost and return values and compare simple project scenarios.

HEALTH & LIFESTYLE

Health & Lifestyle Calculators

Use these health calculators for general educational estimates. They are screening and planning tools, not medical diagnoses or treatment recommendations.

BMI Calculator

Calculate adult BMI using metric or imperial measurements and see the standard adult BMI category.

Calorie Calculator

Estimate daily calorie needs using BMR, activity level and weight-maintenance or change goals.

BUSINESS & EVERYDAY MATHS

Business & Everyday Maths Calculators

Solve common percentage and quotation calculations quickly, with straightforward inputs and results.

Percentage Calculator

Calculate X% of Y, percentage increases or decreases, and percentage change.

Price Quote Calculator

Build an instant product or service quotation from quantities, rates and selected pricing inputs.

HOW THE HUB WORKS

Simple Tools, Clearer Calculations

DiuMitra calculators are designed for quick scenario planning. Enter the relevant values, review the result, then use the page explanation to understand the assumptions behind it.

Clear Inputs

Each calculator states the values it needs so you can test different scenarios confidently.

Formula Context

Individual tool pages explain the calculation method, assumptions or worked examples where relevant.

No Account Required

Open a calculator and use it without creating a DiuMitra account.

Important: A calculator result is only as useful as the information entered and the assumptions used. Mortgage, tax, investment and health outcomes can depend on factors a general calculator cannot capture.

SUPPORTING GUIDES

Calculator Guides & Explanations

Use these published DiuMitra guides when you need context beyond a single calculation. Each guide supports the calculator journey without replacing the tool itself.

How Compound Interest Works

Understand compounding before using the savings and investment calculators.

BMI vs Body Fat

Understand what BMI can and cannot tell you about body composition.

Mortgage Readiness Checklist

Use the mortgage, DTI and affordability tools alongside a broader home-buying checklist.

Financial Planning in 2026

See how savings, investment and retirement calculations can fit into a wider financial plan.

COMMON QUESTIONS

Free Online Calculators – Frequently Asked Questions

Quick answers about using the DiuMitra calculator hub and choosing the right tool.

Yes. The 21 calculator URLs listed on this hub were checked as live on 16 August 2026. If a tool is updated later, the published URL should remain the same unless a properly managed migration is required.

Yes. The calculator pages listed here can be opened and used without creating a DiuMitra account. Some tools are designed for estimates or scenario planning rather than official decisions.

Start with the Mortgage Affordability Estimator to explore a house budget, then use the DTI Calculator for debt-to-income context and the Mortgage Calculator to model monthly repayments and total interest.

No. Results are general calculations or estimates based on the information entered and the assumptions stated on each page. Important financial, tax or health decisions should be checked with the relevant official source, provider or qualified professional.

Individual calculator pages provide the formula, assumptions, worked examples or explanatory sections relevant to that tool. This hub focuses on helping you choose the correct calculator rather than repeating every formula.

Yes. The tools are designed for web use across common desktop, tablet and mobile screen sizes. If a particular calculator appears incorrectly on a device, refresh the page and use the latest browser version.

DIUMITRA TOOLS

Use the Calculator That Matches Your Question

Start with one calculator, change one assumption at a time, and use the supporting explanation to understand the result. For important decisions, compare the estimate with the relevant official source or professional guidance.

Browse All Calculators Read Supporting Guides

Information notice: DiuMitra calculators provide general educational estimates and planning support. They are not official mortgage offers, tax assessments, medical diagnoses or regulated financial advice. Requirements, rates and individual circumstances can change.