Math & Calculators
Calculators for finance, health, percentages, programmer arithmetic and everyday maths
Calculators for percentages, loans, mortgages, compound interest, ROI, VAT, margins and salaries, health metrics such as BMI, BMR and TDEE, and programmer arithmetic in binary and hexadecimal. Results are estimates based on the formulas explained on each page; for financial, tax or medical decisions, confirm them with a qualified professional.
Tools in this category: 43
Good places to start
All tools in this category
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Aspect Ratio Calculator
Simplify any width × height to its aspect ratio (1920×1080 → 16:9) and calculate the missing width or height when resizing images, video or screens.
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Binary Calculator
Binary calculator for any size integer: add, subtract, multiply, divide, AND, OR, XOR, NOT and bit shifts, with results in binary, hex, decimal and octal.
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BMI Calculator
Calculate your body mass index in metric or imperial units, see the WHO adult category, BMI Prime and the healthy weight range for your height.
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BMR Calculator
Calculate your basal metabolic rate with Mifflin-St Jeor, revised Harris-Benedict or Katch-McArdle, and see calories burned at each activity level.
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Body Fat Calculator
Estimate body fat percentage with the US Navy circumference method from height, neck, waist and hips, plus fat mass, lean mass and the ACE category.
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Break-Even Calculator
Find the break-even point in units and revenue from fixed costs, price per unit and variable cost per unit, plus the units needed to reach a target profit.
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Calorie Calculator
Estimate daily calories to maintain, lose or gain weight from age, sex, height, weight and activity using Mifflin-St Jeor, Harris-Benedict or Katch-McArdle.
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Car Loan Calculator
Calculate a car loan payment including down payment, trade-in value, amount owed, sales tax and fees, plus total interest and the total cost of the car.
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Compound Interest Calculator
See how savings grow with compound interest: choose compounding (daily to continuous), add deposits at the start or end, and view a yearly table.
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Crypto Profit Calculator
Calculate crypto profit or loss from the amount invested, buy and sell price and a percentage trading fee: coins bought, net proceeds, return and break-even.
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Debt Payoff Calculator
Plan paying off several debts: compare avalanche (highest APR first) and snowball (smallest balance first) by months to debt-free and total interest.
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Discount Calculator
Calculate the sale price after one or several stacked percentage discounts, how much you save, the true total discount and the final price including sales tax.
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Down Payment Calculator
Calculate a home down payment, closing costs, total cash needed, loan amount and LTV, and how many months it takes to save the rest at your saving rate.
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Electricity Cost Calculator
Calculate an appliance's energy use in kWh and its electricity cost per day, month and year from its wattage, hours of use, days per week and price per kWh.
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Fuel Cost Calculator
Calculate the fuel and cost of a trip from distance, fuel economy and price, in km or miles, L/100km, km/L or MPG (US/UK), per litre or gallon.
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GPA Calculator
Calculate your semester and cumulative GPA from course credits and letter grades on the US 4.0 or 4.3 scale, or with grade points from any other scale.
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Grade Calculator
Calculate your current weighted course grade from assignments and their weights, and the score you need on the final exam to reach your target grade.
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Hex Calculator
Hexadecimal calculator: add, subtract, multiply, divide and apply AND, OR, XOR, NOT and shifts to hex numbers, with binary, decimal and octal output.
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Ideal Weight Calculator
Estimate ideal body weight from height and sex with the Devine, Robinson, Miller and Hamwi formulas, compared with the healthy BMI weight range.
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Inflation Calculator
Calculate how prices grow with inflation and how much purchasing power money loses over time, using an annual rate or two CPI index values.
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Investment Calculator
Project the future value of an investment with an initial amount, monthly contributions and an expected return, and see it in today's money after inflation.
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Lease vs Buy Calculator
Compare leasing a car with buying it with a loan over the same period: lease total versus net cost of buying after resale value and remaining loan balance.
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Loan Calculator
Calculate the monthly payment, total interest and total cost of a fixed-rate loan, with a full yearly or monthly amortization schedule. Handles 0% loans.
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Macro Calculator
Split a daily calorie target into grams of protein, carbohydrates and fat with balanced, low-carb, high-protein, keto or custom ratios, per day and per meal.
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Profit Margin Calculator
Calculate gross profit, margin and markup from cost and price, or find the selling price that achieves a target margin or markup. Free, instant, no sign-up.
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Mortgage Calculator
Estimate your full monthly mortgage payment: principal and interest plus property tax, home insurance, PMI and HOA fees, with an amortization schedule.
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One Rep Max Calculator
Estimate your one-rep max from a weight and number of reps with the Epley, Brzycki and Lombardi formulas, plus a table of training weights from 50% to 100%.
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Running Pace Calculator
Calculate running pace, finish time or distance from the other two, in km or miles, with speed in km/h and mph and finish times for 5K, 10K, half and marathon.
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Payroll Calculator
Calculate net take-home pay from gross pay with your own pre-tax and after-tax deductions and an income tax rate. Generic and transparent, not country-specific.
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Percentage Calculator
Free percentage calculator: find X% of a number, what percent X is of Y, the percentage change between two values, or add and subtract a percentage.
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PPI Calculator
Calculate pixels per inch (PPI), pixels per cm and dot pitch from a screen resolution and diagonal size in inches or cm. Also shows physical width and height.
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Pregnancy Due Date Calculator
Estimate your due date from the last menstrual period (Naegele's rule, any cycle length), conception date or IVF transfer, with gestational age and trimester.
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Retirement Calculator
Project your retirement savings, the nest egg needed for an inflation-adjusted income, the monthly income your savings can support and any shortfall.
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ROI Calculator
Calculate return on investment from the amount invested and the final value, plus the annualized return (CAGR) for any holding period in years.
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Salary Calculator
Convert pay between hourly, daily, weekly, biweekly, semimonthly, monthly and yearly amounts, with adjustable hours per week, days per week and weeks per year.
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Savings Goal Calculator
Find how much to save each month to reach a savings goal by a deadline, or how long it takes with a fixed monthly deposit, including interest earned.
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Scientific Calculator
Free scientific calculator with correct operator precedence, sin/cos/tan in degrees or radians, log, ln, roots, factorial, constants, memory keys and history.
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Stock Profit Calculator
Calculate profit or loss on a stock trade from shares, buy and sell price and commissions, with the percentage return and the break-even selling price.
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Tax Calculator
Calculate income tax with your own progressive brackets or a flat rate: total tax, effective and marginal rate, after-tax income and a bracket breakdown.
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TDEE Calculator
Estimate your total daily energy expenditure (TDEE) from your BMR and activity level, with a table of calories for every activity level. Metric or imperial.
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Tip Calculator
Calculate the tip and total for a restaurant bill, split it between any number of people and optionally round each share or the total up to a whole amount.
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VAT Calculator
Add VAT to a net price or extract VAT from a gross price at any rate. Shows net, VAT and gross amounts, with quick rates such as 5, 10, 19, 20 and 21%.
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Water Intake Calculator
Estimate your daily water needs from body weight, exercise and climate, in litres, fluid ounces and glasses, compared with EFSA and US reference intakes.
Other categories
- CRC Cyclic Redundancy Check algorithms for error detection
- MD Message Digest algorithms (MD2, MD4, MD5)
- SHA-1 Secure Hash Algorithm 1 - 160-bit hash function
- SHA-2 Secure Hash Algorithm 2 family (SHA-224, SHA-256, SHA-384, SHA-512)
- SHA-3 Secure Hash Algorithm 3 based on Keccak
- Keccak Keccak cryptographic hash function
- SHAKE Extendable-output functions (SHAKE128, SHAKE256)
- cSHAKE Customizable SHAKE functions
- KMAC Keccak Message Authentication Code
- Password & Security Password generation, analysis, hashing, and security tools
- Encryption & Cryptography Symmetric and asymmetric encryption, HMAC and key generation (AES, 3DES, RSA, PGP)
- Encoding Encode and decode data: Base64, Base32, Base58, URL, HTML entities, hex, Unicode and more
- Formatters Format, minify and validate code and data (JSON, XML, YAML, SQL, HTML, CSS) and convert naming cases
- Generators Generate IDs, keys, test data, QR codes, barcodes and config files (UUID, API keys, .gitignore, Dockerfile)
- Converters Convert data formats, number bases, colours, timestamps, units and currencies (JSON, CSV, YAML, XML)
- Text Tools Count, compare, clean and transform text (word count, diff, regex, case, duplicates)
- Image Tools Tools for manipulating and converting images (Compress, Resize, Convert)
- Design & CSS Generate CSS visually: shadows, gradients, flexbox and grid layouts, animations and colour palettes
- Web Tools Tools for web developers and SEO (JWT, URLs, DNS, HTTP headers, meta tags, sitemaps)
- Time & Date Time zones, date differences, business days, timers, stopwatch and world clock