Free Calculators.
Built to be simple.
Calculate, compare, convert, estimate and plan — 98 tools that run entirely in your browser. Fast, accurate and private, with no account and no tracking.
Find any calculator instantly.
Most-used calculators.
Percentage Calculator
Find a percentage of a number, percentage change and percentage difference in one tool.
Use toolAge Calculator
Exact age in years, months and days, plus days until your next birthday.
Use toolBMI Calculator
BMI, WHO category and healthy weight range — metric or imperial.
Use toolCurrency Calculator
Convert between 25 world currencies with an exchange rate you control.
Use toolUnit Conversion Calculator
Convert length, weight, temperature, area, volume, speed, time and data.
Use toolScientific Calculator
Full scientific calculator: trig, logs, powers, roots, constants and memory.
Use toolMortgage Calculator
Monthly mortgage payment with interest, taxes and insurance.
Use toolCompound Interest Calculator
Compound growth with monthly contributions, year by year.
Use toolLoan Calculator
Monthly payment, total interest and amortization for any loan.
Use toolSIP Calculator
SIP growth with optional annual step-up.
Use toolCalorie Calculator
Daily calorie needs (TDEE) and weight-change targets by activity level.
Use toolTip Calculator
Tip amount, total bill and per-person split.
Use toolOrganised by topic.
Math
Arithmetic, fractions, percentages, ratios and everyday math tools that give you exact answers …
Browse 6 toolsCalculus & Algebra
Derivatives, integrals, matrices, complex numbers and scientific notation — solved numerically …
Browse 3 toolsGeometry
Area, volume and triangle calculators for shapes from squares to spheres.…
Browse 7 toolsStatistics
Standard deviation, z-scores, binomial probabilities, confidence intervals, correlation and reg…
Browse 5 toolsConversion
Currency, units, roman numerals and shoe sizes — convert between any two units locally.…
Browse 6 toolsDate & Time
Age, date and time math, pregnancy due dates, fertility windows and sleep planning.…
Browse 6 toolsHealth & Fitness
BMI, calories, BMR, body fat and calories burned — general reference tools, not medical advice.…
Browse 2 toolsSpeed & Distance
Pace, speed and distance calculators for runners, cyclists and travellers.…
Browse 27 toolsLoans & Mortgages
Mortgage, auto, personal and student loan tools with full amortization and payoff plans.…
Browse 15 toolsInvesting & Retirement
Compound interest, SIP, ROI, IRR, NPV, 401(k) and retirement planning tools.…
Browse 8 toolsPersonal Finance
Tips, discounts, tax, budgets, net worth and inflation tools for everyday money decisions.…
Browse 3 toolsTax
Paycheck, income tax and capital gains estimators built on the rates you enter.…
Browse 3 toolsEducation
GPA and grade calculators for students planning their semester.…
BrowseStart with these.
Age Calculator
Exact age in years, months and days, plus days until your next birthday.
Use toolPercentage Calculator
Find a percentage of a number, percentage change and percentage difference in one tool.
Use toolMortgage Calculator
Monthly mortgage payment with interest, taxes and insurance.
Use toolBMI Calculator
BMI, WHO category and healthy weight range — metric or imperial.
Use toolCompound Interest Calculator
Compound growth with monthly contributions, year by year.
Use toolCurrency Calculator
Convert between 25 world currencies with an exchange rate you control.
Use toolScientific Calculator
Full scientific calculator: trig, logs, powers, roots, constants and memory.
Use toolGPA Calculator
Term GPA on 4.0 or 5.0 scales with credit weighting.
Use toolThree steps. That's it.
Open a calculator
Pick from 98 tools across 13 categories, or search by name and keyword.
Enter your values
Numbers, dates, sliders or dropdowns — whatever fits the calculation.
Get the answer
Instant results you can copy, share or print. Your data never leaves your device.
Your data never leaves your device.
Every calculation on this site runs in your browser using vanilla JavaScript. Nothing is uploaded, stored or tracked.
- 100% local, client-side calculations
- No data stored on any server
- No tracking, no analytics, no ads scripts
- Works offline once loaded
Site FAQ
Are the calculators really free?
Yes — every one of the 98 tools is free, with no sign-up, no limits and no paid tier.
Do you collect my data?
No. Calculations run locally in your browser; the site has no database, no analytics and no tracking scripts.
Are the results accurate?
Each calculator uses standard, verified formulas and is tested for edge cases. Finance and health tools clearly state their assumptions.
Do financial calculators use live rates?
No — this static site has no data feeds. You enter rates and assumptions, and the calculators label them clearly.
Does the site work offline?
Once visited, the app shell is cached and calculators keep working offline where the browser permits.
Can I suggest a new calculator?
Absolutely — email minitoolszz@gmail.com or use the suggest page. Useful ideas go on the roadmap.
Free Online Calculators for Everyday Problems
Free Calculators Toolsz is a collection of practical calculation tools covering the problems people search for most: percentages, ages, unit and currency conversions, BMI and calories, mortgage and loan payments, investments, taxes and statistics.
Every tool is a real calculator — not a landing page pretending to be one. Results are computed instantly with standard formulas, edge cases are handled, and the assumptions behind financial and health tools are stated on each page. Because the site is fully static, everything runs locally: your numbers are never uploaded, there are no accounts, and no tracking is installed.
New tools are added regularly. Browse by category, search by name, or start with the most-used calculators above.