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Calculators & Unit Converters

43 fast, accurate, privacy-friendly calculators and unit converters — finance, health, math, dates and every common unit. 100% free, no account, and everything runs right in your browser.

100% free No sign-up or login No ads or trackers Private — runs in your browser Works on mobile

Financial Calculators

Mortgages, loans, interest, investing, salary & tax.

Mortgage Calculator Estimate your monthly mortgage payment including taxes, insurance and HOA. Loan Calculator Work out the monthly payment, total interest and payoff for any fixed loan. Auto Loan Calculator Calculate a car payment with sales tax, down payment and trade-in. Compound Interest Calculator See how savings grow with compound interest and regular contributions. Simple Interest Calculator Calculate simple interest on a principal over time. Investment Calculator Project the future value of an investment with regular contributions. Retirement Calculator Estimate your retirement nest egg and monthly income. Amortization Calculator Build a full amortization schedule for any loan or mortgage. Sales Tax Calculator Add or remove sales tax from any price. Salary Calculator Convert pay between hourly, weekly, monthly and annual. Price Per Square Foot Calculator Compare property value with price per square foot (or square meter).

Health & Fitness

BMI, BMR, calories, body-fat and more.

BMI Calculator Calculate your Body Mass Index and healthy weight range. BMR Calculator Find your Basal Metabolic Rate — calories burned at rest. Calorie Calculator Estimate daily calories to maintain, lose or gain weight. Body Fat Calculator Estimate body-fat percentage with the U.S. Navy method. Ideal Weight Calculator See your ideal body weight across four classic formulas. Pace Calculator Calculate running pace and speed from distance and time.

Math & Numbers

Percentages, fractions, statistics, scientific.

Percentage Calculator Solve the three common percentage questions in one place. Percentage Change Calculator Find the percentage increase or decrease between two values. Fraction Calculator Add, subtract, multiply and divide fractions, simplified. Standard Deviation Calculator Compute mean, variance and standard deviation of a data set. Triangle Calculator Solve a triangle from three sides — angles, area and perimeter. Random Number Generator Generate random integers or decimals in any range. Scientific Calculator A full scientific calculator with trig, logs, powers and more. Number Base Converter Convert between binary, octal, decimal and hexadecimal.

Date & Time

Age, date differences, timesheet hours.

Age Calculator Calculate exact age in years, months and days from a birth date. Date Difference Calculator Count the days, weeks and months between two dates. Date Calculator Add or subtract days, months and years from a date. Hours Calculator Work out hours and minutes between two times, minus breaks.

Unit Converters

Length, weight, volume, temperature + 10 more.

Length Converter Convert metres, feet, inches, miles, kilometres and more. Weight & Mass Converter Convert kilograms, pounds, ounces, stones, grams and tons. Volume Converter Convert litres, gallons, cups, millilitres, pints and more. Temperature Converter Convert Celsius, Fahrenheit and Kelvin. Area Converter Convert square feet, square metres, acres, hectares and more. Pressure Converter Convert bar, psi, pascals, atmospheres and mmHg. Energy Converter Convert joules, calories, kWh, BTU and more. Power Converter Convert watts, kilowatts, horsepower and BTU/hour. Force Converter Convert newtons, pound-force, kilogram-force and dynes. Speed Converter Convert mph, km/h, m/s, knots and feet/second. Time Converter Convert seconds, minutes, hours, days, weeks and years. Angle Converter Convert degrees, radians, gradians and arcminutes. Data Storage Converter Convert bytes, KB, MB, GB, TB and binary (KiB, MiB, GiB). Fuel Consumption Converter Convert MPG (US/UK), L/100km and km/L.

About these free calculators

ConvertFleet's calculator suite gives you 43 free online calculators and unit converters in one place — from a mortgage and compound-interest calculator to BMI, percentages, a scientific calculator, and converters for length, weight, volume, temperature and more. There's nothing to install and no account to create: pick a tool, type your numbers, and the answer appears instantly. Every calculation happens locally in your browser, so the values you enter stay completely private.

Frequently asked questions

Are the calculators on ConvertFleet free to use?

Yes — every calculator and unit converter here is 100% free, with no sign-up, no account and no usage limits.

Do I need to create an account or install anything?

No. Open any tool and start typing — they run instantly in your browser on desktop and mobile, with nothing to download.

Is my data private?

Completely. Every calculation runs locally in your browser; the numbers you enter are never sent to a server or stored anywhere.

How accurate are the calculators and converters?

Conversions use exact, internationally-defined factors, and the finance and health tools follow standard formulas (loan amortization, Mifflin-St Jeor, Heron's formula and more).

Can I use these tools on my phone?

Yes — the layout is fully responsive, and once a page has loaded it keeps working even without a connection.

All 43 tools are free, ad-free and run entirely in your browser · Last updated June 2026