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Every calculator you need — in one place.

49 free tools for finance, health, math, and everyday conversions. No signup. No paywall. Results in real time.

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Free Online Calculators & Converter Tools

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Age Calculator

This is a free online age calculator that computes your exact age in years, months, and days from your date of birth.

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Auto Loan Calculator

Free online auto loan calculator. Estimate monthly car payments, total loan interest, sales tax, and trade-in value deductions.

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Basic Calculator

This is a free online basic calculator with memory functions that handles everyday arithmetic — addition, subtraction, multiplication, and division.

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BMI Calculator

This is a free online BMI calculator that computes your Body Mass Index from height and weight and shows whether you are underweight, normal, overweight, or obese.

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BMR Calculator

Free online BMR calculator. Calculate Basal Metabolic Rate using Mifflin-St Jeor and Harris-Benedict formulas.

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Body Fat Calculator

This is a free online body fat calculator that estimates your body fat percentage using the U.S. Navy method from neck, waist, and hip measurements.

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Calorie Calculator

Free online calorie calculator. Estimate daily calorie needs based on age, gender, height, weight, and activity level for weight loss or gain.

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Celsius to Fahrenheit Converter

Free online Celsius to Fahrenheit converter. Convert °C to °F instantly with formula and temperature reference chart.

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Popular

Compound Interest Calculator

Free online compound interest calculator. Calculate growth over time with initial deposit, monthly contributions, and compounding frequency.

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Date Calculator

This is a free online date calculator that computes the number of days between two dates and lets you add or subtract days from a given date.

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Debt Payoff Calculator

Compare Debt Snowball vs Debt Avalanche payoff strategies side-by-side. Calculate exact debt-free dates and total interest saved.

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Discount Calculator

Free online discount calculator. Calculate sale price, money saved, and final cost with percentage-off deals.

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Feet to cm Converter

Free online Feet to Centimeters converter. Convert ft to cm instantly with formula and height conversion reference chart.

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Fraction Calculator

Free online fraction calculator. Add, subtract, multiply, and divide fractions and mixed numbers with step-by-step simplifying.

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Full Screen Calculator

Free online full screen calculator with large buttons and high-contrast display. Ideal for presentations, classrooms, accessibility, and desktop work.

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Popular

GPA Calculator — College & High School GPA Calculator

Free global GPA calculator supporting weighted & unweighted 4.0, 4.33, 5.0, and 10.0 scales. Calculate high school, college, cumulative, target GPA, and percentage conversions instantly.

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Grade Calculator

This is a free online grade calculator that determines the minimum score you need on your final exam to achieve your desired course grade.

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Hours Calculator

Free online hours calculator. Calculate total time elapsed, work shift hours, and break deductions between start and end times.

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Ideal Weight Calculator

Free online ideal weight calculator. Calculate healthy weight range using Devine, Robinson, Miller, and Hamwi formulas.

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Inches to cm Converter

Free online Inches to Centimeters converter. Convert inches to cm instantly with formula and length conversion chart.

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Investment Calculator

Free online investment calculator. Calculate Return on Investment (ROI), total profit, and annualized compound returns.

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kg to lbs Converter

Free online Kilograms to Pounds converter. Instantly convert kg to lbs with formula and conversion table.

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Popular

Loan Calculator

Free online loan calculator. Calculate monthly loan payments, total interest paid, and payoff schedule for personal or business loans.

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Love Calculator

Free online love calculator. Calculate love compatibility percentage between two names with fun algorithm results.

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Miles to km Converter

Free online Miles to Kilometers converter. Convert miles to km instantly with formula and distance conversion chart.

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Mortgage Calculator

Free online mortgage calculator. Estimate monthly home loan payments and amortization schedules based on principal, interest rate, and term.

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One-Rep Max Calculator

Free online 1RM one-rep max calculator. Calculate your 1-rep maximum lifting capacity using Epley and Brzycki formulas.

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Online Abacus

Free online interactive Japanese Soroban abacus. Learn mental math, place value counting, and physical bead manipulation.

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Online Ruler

Free on-screen actual size online ruler calibrated to your screen. Measure objects in centimeters, millimeters, or inches directly on your display.

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Ovulation Calculator

Estimate fertile window and ovulation dates based on your cycle length and last menstrual period. Plan or prevent pregnancy effectively.

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oz to grams Converter

Free online Ounces to Grams converter. Convert oz to g instantly with formula and kitchen weight conversion chart.

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Password Generator

Free online secure password generator. Create strong, random passwords with customizable length, symbols, numbers, and uppercase characters.

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Popular

Percentage Calculator

Free online percentage calculator. Calculate percentage increase, decrease, percentage of numbers, and fraction conversions instantly.

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Pregnancy Due Date Calculator

Free online pregnancy due date calculator. Calculate estimated due date and gestational trimester milestones using Naegele's rule.

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Random Name Picker

Free online random name picker. Draw winner names randomly for raffles, giveaways, classroom calls, and team selections.

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Ratio Calculator

Free online ratio calculator. Solve for unknown values in proportions (A:B = C:D), simplify ratios, and scale ratios.

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Refinance Calculator

Calculate mortgage refinancing savings, monthly payment differences, closing cost break-even timeline, and total lifetime interest savings.

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Rent vs. Buy Calculator

Compare the 30-year financial impact of buying vs renting a home. Accounts for mortgage payments, taxes, maintenance, home appreciation, and opportunity cost.

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Retirement Calculator

Free online 401k and retirement calculator. Estimate retirement nest egg savings, employer match, and monthly withdrawal income.

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Salary to Hourly Calculator

Convert annual salary to hourly wage and vice versa. Includes working hours, overtime, and estimated net take-home pay calculations.

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Sales Tax Calculator

Free online sales tax calculator. Calculate gross price, sales tax amount, and net pre-tax price instantly.

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Savings Calculator

Free online savings goal calculator. Calculate how much to save monthly to reach your target savings goal.

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Scientific Calculator

Free online scientific calculator with trigonometry, logarithms, powers, roots, factorials, and DEG/RAD modes. Supports full keyboard input and expression history.

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Sleep Cycle Calculator

Calculate optimal bedtimes and wake-up times based on 90-minute REM sleep cycles. Wake up feeling refreshed without grogginess.

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Standard Deviation Calculator

Free online standard deviation calculator. Calculate sample and population standard deviation, mean, variance, and sum of squares.

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Take-Home Paycheck Calculator

Calculate net take-home paycheck earnings with federal tax withholdings, FICA, 401(k), and state taxes for CA, NY, TX, FL, and IL.

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Time Zone Converter

Convert time across major global time zones including UTC, EST, PST, GMT, CET, IST, and JST. Interactive, accurate, and DST-aware.

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Tip Calculator

Free online tip calculator with bill splitting. Calculate tip percentage, per-person total, and custom gratuity amounts.

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Triangle Calculator

Free online triangle calculator. Calculate area, perimeter, angles, and sides using Pythagorean theorem and trigonometric laws.

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