Free Math Tools and Calculators
Every tool here runs in your browser, needs no sign-up and shows its formula and worked examples so you can learn the method as well as get the answer. Looking for the full keypad? Open the scientific calculator.
Browse by topic: Health calculators · Finance calculators · Unit converters · Date & time calculators · Everyday math calculators · India finance calculators
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Numbers
Percentage CalculatorFind a percent of a number, percent change, and increases or decreases.
GCF and LCM CalculatorFind the greatest common factor and least common multiple of up to 8 numbers.
Prime Number CheckerTest whether a number is prime and see its factorization and neighbouring primes.
Number Base ConverterConvert between binary, octal, decimal, hexadecimal and any base up to 36.
Unit ConverterConvert length, mass, temperature, volume, area and speed between metric and imperial units.
Ratio CalculatorSolve proportions like A : B = C : x and simplify ratios.
Scientific Notation ConverterConvert numbers to scientific, engineering and standard notation.
Roman Numeral ConverterConvert numbers to Roman numerals and back, from 1 to 3999.
Times Table GeneratorGenerate the multiplication table for any number, up to 30 rows.
Factorial CalculatorCompute n! exactly for n up to 1,000, with digit count and trailing zeros.
Prime Factorization CalculatorBreak a number into primes and see its divisor count and divisor sum.
Factors CalculatorList every factor and factor pair of a number and see whether it is perfect, abundant or deficient.
Divisibility CheckerTest a number for divisibility by 2, 3, 4, 5, 6, 8, 9, 10 and 11, with the rule shown.
Rounding CalculatorRound to decimal places, significant figures or the nearest 10, 100 or 1,000.Fractions
Algebra
Quadratic Equation SolverSolve ax² + bx + c = 0 with the discriminant, roots and vertex.
Exponent CalculatorRaise any number to a power, including negative and fractional exponents.
Logarithm CalculatorCalculate logs in any base with change-of-base steps.
Equation SolverSolve linear equations and 2×2 systems of equations with steps and a built-in check.
Root CalculatorFind square roots, cube roots and n-th roots, with simplified radical form.
Polynomial CalculatorAdd, subtract and multiply polynomials and evaluate the result at any x.
Sequence CalculatorFind the n-th term, the sum and the first terms of an arithmetic or geometric sequence.
Graphing CalculatorPlot any function of x, find its roots and y-intercept and see its highest and lowest values.Statistics
Statistics CalculatorMean, median, mode, range, variance and standard deviation for any list of numbers.
Permutation and Combination CalculatorFind nPr, nCr, factorials and counts with repetition.
Average CalculatorFind the mean, weighted average, geometric mean and harmonic mean of a list.
Probability CalculatorFind the probability of “not A”, “A and B”, “A or B” and conditional probability.Geometry
Pythagorean Theorem CalculatorFind the hypotenuse or a missing leg of a right triangle, plus area, perimeter and angles.
Geometry CalculatorArea, perimeter, circumference, volume and surface area of common shapes.
Triangle CalculatorSolve any triangle from three sides, two sides and an angle, or two angles and a side.
Trigonometry CalculatorFind sin, cos, tan, csc, sec and cot of any angle, or the inverse trig functions.
Circle CalculatorFind radius, diameter, circumference and area from any one of them.Finance
Mortgage CalculatorEstimate a monthly mortgage payment, total interest and total cost.
Compound Interest CalculatorSee how savings grow with compounding and regular contributions.
Simple Interest CalculatorCalculate interest earned or owed with I = P × r × t.
Loan CalculatorEstimate loan payments and see how extra payments cut interest and time.
Student Loan CalculatorEstimate a student loan payment, see what extra payments save and what it takes to pay it off faster.
College Savings CalculatorEstimate the future cost of college and the monthly saving needed to cover it.
Family Budget CalculatorSplit your monthly income into needs, wants and savings, using the 50/30/20 rule or your own percentages.
Life Insurance Needs CalculatorEstimate how much life insurance coverage your family may need using debts, income and future costs.
Braces Cost CalculatorTurn a braces quote into a monthly payment after insurance, a down payment and any financing interest.
Tutoring Cost CalculatorWork out the cost per session, per month and in total for a tutoring plan, with package discounts.
Mortgage Refinance CalculatorSee whether refinancing saves money: new payment, monthly saving, break-even month and total cost compared with keeping your loan.
Mortgage Payoff CalculatorSee how extra monthly payments or a lump sum shorten your mortgage and how much interest you save.
Home Affordability CalculatorEstimate the home price you can afford from income, debts, down payment and rate using lender debt-to-income ratios.
Salary Calculator (Hourly to Annual)Convert hourly, daily, weekly, bi-weekly, monthly or annual pay into every other period, with an optional take-home estimate.
Retirement CalculatorProject your retirement savings, see the income they could provide in today’s money and what you need to save to hit your goal.
FIRE CalculatorFind your FIRE number and how many years until financial independence at your savings rate, plus your Coast FIRE number.
Auto Loan CalculatorWork out a car loan’s monthly payment, interest and total cost with down payment, trade-in, sales tax and fees.
Personal Loan CalculatorSee the monthly payment, total interest and the true APR of a personal loan including its origination fee.
Rent vs Buy CalculatorCompare the long-term net worth of buying a home against renting and investing the difference, with a break-even year.
Inflation CalculatorSee what money will be worth after inflation, what things will cost later, or the average inflation implied by two prices.
Sales Tax CalculatorAdd sales tax to a price, take it out of a total, or find the tax rate from two prices.
VAT CalculatorAdd VAT to a price, remove VAT from a total or find the VAT rate — with UK 20%, 5% and 0% presets.
GST CalculatorAdd or remove GST on a price, with New Zealand 15%, Australia 10% and Canada’s 5% federal rate presets.
EMI CalculatorWork out your monthly EMI, total interest and a year-by-year schedule, with an optional prepayment to see time and interest saved.
Home Loan EMI CalculatorCalculate your home loan EMI, total interest, processing fee, prepayment savings and how much loan your income can support.
Car Loan EMI CalculatorCalculate your car loan EMI, down payment, total interest and the real total cost of the car.
Personal Loan EMI CalculatorCalculate your personal loan EMI, processing fee with GST, the cash you actually receive and the true effective rate.
SIP CalculatorEstimate the maturity value of a monthly SIP, the amount invested and the returns, with a year-by-year table.
Step-Up SIP CalculatorSee how increasing your SIP every year grows your corpus compared with a flat SIP.
SIP Goal CalculatorFind the monthly SIP you need to reach a target amount, with optional step-up and inflation.
SWP CalculatorSee how long a corpus lasts with monthly withdrawals, or the level monthly income it can fund.
GST Calculator IndiaAdd or remove GST at 5%, 18% or 40%, with the CGST + SGST or IGST split.
Income Tax Calculator India (New vs Old Regime)Compare tax under the new and old regimes for FY 2026-27, with rebate, standard deduction, surcharge and cess.
PPF CalculatorEstimate your Public Provident Fund maturity value with yearly or monthly deposits, tax-free interest and a yearly table.
FD CalculatorCalculate fixed deposit maturity amount and interest for any rate, tenure and compounding.
RD CalculatorCalculate recurring deposit maturity and interest for a monthly deposit, rate and tenure.
CAGR CalculatorFind the compound annual growth rate between two values, the future value at a given rate, or the years needed.
ROI CalculatorWork out return on investment, net profit and the annualised return for any investment.
Debt Snowball vs Avalanche CalculatorCompare the debt snowball and avalanche methods side by side: months to debt-free, total interest and payoff order.Everyday
Percentage Change CalculatorFind the percent increase or decrease between two numbers.
Discount CalculatorWork out the sale price, the savings and the final total with tax after one or two discounts.
Tip CalculatorCalculate the tip, the total and each person’s share of a bill.
Age CalculatorWork out exact age in years, months and days, plus the days until your next birthday.
Speed, Distance and Time CalculatorFind speed, distance or travel time from the other two, with km, miles, minutes and hours.
Password GeneratorCreate strong random passwords with your browser’s secure random generator, with entropy and crack-time estimates.
QR Code GeneratorMake a free QR code for a link, text, Wi-Fi login or email address and download it as PNG or SVG — made in your browser.
Invoice GeneratorCreate a clean invoice with line items, tax, discount and totals, then print it or save it as a PDF — free, no sign-up.
Fuel Cost CalculatorWork out the fuel needed and cost for a trip in km or miles, with km/l, L/100 km or mpg, split between people.
Random Number GeneratorPick truly random numbers in any range: whole or decimal, unique or repeating, sorted, with sum and average.
Random Word GeneratorGet random English words — nouns, adjectives or verbs, with optional starting letters — for games, writing prompts and brainstorming.
Dice RollerRoll d4, d6, d8, d10, d12, d20 or d100 — any number of dice, with modifiers and advantage or disadvantage.
Typing TestMeasure your typing speed (WPM) and accuracy with a timed test of 30 seconds to 3 minutes — free, no sign-up.
Pomodoro TimerA free online Pomodoro timer: 25-minute focus sessions, short and long breaks, sound alerts and a live countdown in the tab title.
Countdown TimerAn online countdown timer for any duration or a date and time, with a sound alarm and a live clock in the tab title.
eBay Fee CalculatorWork out eBay final value fees, per-order fees, ad fees and your real profit — and the price you need to hit a profit target.
Work Hours CalculatorAdd up hours worked from start and end times with breaks and overnight shifts, plus overtime and gross pay.Health
BMI CalculatorCalculate body mass index for adults in kg/cm or lb/feet/inches, with the WHO category and the healthy weight range for your height.
Calorie Calculator (TDEE, BMR & Macros)Estimate your BMR, daily calorie needs (TDEE), a calorie target for your goal and a macro split, in lb/ft or kg/cm.
Body Fat Calculator (US Navy Method)Estimate body fat percentage from height, neck, waist (and hip) measurements in cm or inches using the US Navy method.
Pregnancy Due Date CalculatorEstimate your due date from your last period, conception date or IVF transfer, with your week of pregnancy and key milestones.
Ovulation CalculatorEstimate your ovulation day, fertile window and next period from your cycle, with the next three cycles mapped out.
Conception Date CalculatorWork out when you probably conceived from your due date or last period, with the likely conception window.
Sleep Debt CalculatorAdd up how much sleep you owe from the past week and estimate how many nights of extra sleep it takes to recover.
Caffeine CalculatorAdd up your daily caffeine from coffee, tea, soda and energy drinks, compare it with the 400 mg guidance and see how much is left at bedtime.
One Rep Max CalculatorEstimate your one-rep max (1RM) from any set using six formulas, with a training-weight table by percentage.Education
Date & Time
Days Between Dates CalculatorFind the exact number of days, weeks and business days between any two dates.
Date Calculator (Add or Subtract Days)Add or subtract days, weeks, months and years from any date.
Business Days CalculatorCount working days between two dates, or add working days to a date, excluding weekends and holidays.
Birthday Countdown CalculatorSee exactly how many days until the next birthday, and what age it turns.
Time Duration CalculatorFind the hours and minutes between two times of day, including overnight shifts.
Day of the Week CalculatorFind what day of the week any date falls on, past or future.
Week Number CalculatorFind the ISO week number for any date, and see exactly which week it is.
Time Zone ConverterConvert a date and time between 40 major time zones, with daylight saving handled for the exact date.Home & DIY
Converters
Length ConverterConvert metres, kilometres, centimetres, miles, yards, feet and inches instantly.
Weight ConverterConvert kilograms, pounds, ounces, stone, grams and tonnes quickly and exactly.
Temperature ConverterConvert Celsius, Fahrenheit and Kelvin with the formula shown, including the below-absolute-zero check.
Area ConverterConvert square metres, square feet, acres, hectares, square miles and more.
Volume ConverterConvert litres, millilitres, US gallons, quarts, pints, cups and fluid ounces for cooking and fuel.
Speed ConverterConvert mph, km/h, m/s, knots and ft/s with the exact factors.
Currency ConverterConvert between 30 major currencies with European Central Bank reference rates, updated every working day.
Cooking Converter (Cups, Grams, Tbsp)Convert cups, tablespoons, teaspoons, ml, grams and ounces for common ingredients, with US, metric and Australian measures.Finance tools give estimates for education and planning only. See our disclaimer.