Calculators tools
Compute percentages, units, taxes, loans and other everyday numeric values instantly in your browser, with the formula shown beside each result.
53 tools in this category, all running in your browser.
Tools in Calculators
Percentage Calculator
/tools/percentage-calculator/Calculate a percentage of a number, what percent one number is of another, or percent change.
Age Calculator
/tools/age-calculator/Calculate an exact age in years, months, and days for any reference date.
Date Calculator
/tools/date-calculator/Compute the number of days between two dates or add a number of days to a date.
Unit Converter
/tools/unit-converter/Convert a value between length, mass, temperature, data-size, and time units.
Number Base Converter
/tools/number-base-converter/Convert an integer between any two bases from 2 to 36 with arbitrary-precision arithmetic.
Business Day Calculator
/tools/business-day-calculator/Count or add business days across weekends and holidays.
Duration Calculator
/tools/duration-calculator/Compute a calendar duration between instants or apply one to a date.
VAT Calculator
/tools/vat-calculator/Add VAT to a net amount or remove it from a gross amount at one rate.
Loan Calculator
/tools/loan-calculator/Estimate a fixed-rate loan's monthly payment, total paid and total interest.
APR Calculator
/tools/apr-calculator/Convert a nominal annual rate to a periodic and effective annual rate.
Compound Interest Calculator
/tools/compound-interest-calculator/Illustrate compound growth of a lump sum with optional contributions.
Average Calculator
/tools/average-calculator/Compute the mean, median, mode and spread of a list of numbers.
Ratio Calculator
/tools/ratio-calculator/Simplify, scale, solve or split a ratio with exact integer reduction.
Area Converter
/tools/area-converter/Convert an area between metric and imperial units with exact factors.
Entropy Calculator
/tools/entropy-calculator/Measure the Shannon entropy and brute-force search space of a password or token in your browser.
CIDR Calculator
/tools/cidr-calculator/Calculate network, broadcast, mask, wildcard, host range and host counts for a CIDR block.
Subnet Calculator
/tools/subnet-calculator/Compute subnet details for an IPv4 address and a subnet mask or prefix, including the host range.
VLSM Calculator
/tools/vlsm-calculator/Allocate a base network across required host counts with variable-length subnet masking.
Wildcard Mask Calculator
/tools/wildcard-mask-calculator/Convert between subnet masks, prefix lengths and wildcard masks for ACLs and routing filters.
IP Calculator
/tools/ip-calculator/Inspect an IPv4 address: class, scope, integer, hex, binary, octal and reverse-DNS name.
IPv4/IPv6 Converter
/tools/ipv4-ipv6-converter/Convert IPv4 to IPv4-mapped, IPv4-compatible and 6to4 IPv6, and normalise IPv6 notation.
Model Pricing Calculator
/tools/model-pricing-calculator/Estimate model cost from input/output token counts and a cited, timestamped price catalog, or your own prices, locally.
Volume Converter
/tools/volume-converter/Convert a volume between metric and US/imperial units with exact factors.
Speed Converter
/tools/speed-converter/Convert a speed between metric and imperial units with exact factors.
Energy Converter
/tools/energy-converter/Convert energy between joule, calorie, watt-hour, BTU and electronvolt units.
Bitwise Calculator
/tools/bitwise-calculator/Apply bitwise AND, OR, XOR, NOT, NAND and NOR and bit shifts to integers.
Fraction Calculator
/tools/fraction-calculator/Add, subtract, multiply and divide fractions with exact integer reduction.
Aspect Ratio Calculator
/tools/aspect-ratio-calculator/Simplify or scale an aspect ratio and resolve the missing dimension of a size.
Roman Numeral Converter
/tools/roman-numeral-converter/Convert between Roman numerals and decimal numbers for values 1 to 3999.
Number Formatter
/tools/number-formatter/Format a number with grouping, fixed or significant precision and scientific notation.
Break-Even Calculator
/tools/break-even-calculator/Find the break-even units and revenue from fixed costs, unit price and unit variable cost.
Profit Margin Calculator
/tools/profit-margin-calculator/Work out profit, profit margin and markup from a cost and a selling price.
Tip Calculator
/tools/tip-calculator/Calculate a tip, the total bill and the split per person.
Discount Calculator
/tools/discount-calculator/Apply one or two stacked discounts and find the savings, final price and effective rate.
Density Calculator
/tools/density-calculator/Compute density in kg/m³ and g/cm³ from a mass and a volume with unit selection.
Molarity Calculator
/tools/molarity-calculator/Compute moles and molarity from a mass, a molar mass and a solution volume.
Ohm's Law Calculator
/tools/ohms-law-calculator/Solve Ohm's law for voltage, current, resistance or power from the other two values.
BMI Calculator
/tools/bmi-calculator/Compute body mass index and the WHO screening band from weight and height (metric or imperial).
BMR Calculator
/tools/bmr-calculator/Estimate resting energy expenditure with the Mifflin-St Jeor equation.
Pace Calculator
/tools/pace-calculator/Find running pace, speed and finish time from a distance and a time.
Unix Permissions Calculator
/tools/unix-permissions-calculator/Convert between symbolic and octal Unix file modes and read the permission bits.
Pressure Converter
/tools/pressure-converter/Convert pressure between pascal, bar, psi, atmosphere, torr and millimetre of mercury.
Power Converter
/tools/power-converter/Convert power between watt, kilowatt, megawatt, horsepower and BTU per hour.
Angle Converter
/tools/angle-converter/Convert angles between radians, degrees, gradians, turns, arcminutes and arcseconds.
Frequency Converter
/tools/frequency-converter/Convert frequency between hertz, kilohertz, megahertz, gigahertz and revolutions per minute.
Force Converter
/tools/force-converter/Convert force between newtons, kilonewtons, pound-force, kilogram-force, dyne and ounce-force.
Torque Converter
/tools/torque-converter/Convert torque between newton-metres, pound-force feet, pound-force inches and kilogram-force metres.
Acceleration Converter
/tools/acceleration-converter/Convert acceleration between metres per second squared, standard gravity, feet per second squared and galileo.
Illuminance Converter
/tools/illuminance-converter/Convert illuminance between lux, foot-candle, phot and nox.
Flow Rate Converter
/tools/flow-rate-converter/Convert volumetric flow between cubic metres per second, litres per minute, CFM and US gallons per minute.
Electric Charge Converter
/tools/charge-converter/Convert electric charge between coulombs, millicoulombs, microcoulombs and ampere-hours.
Data Rate Converter
/tools/data-rate-converter/Convert data transfer rates between bits per second, megabits per second and bytes per second.
Luminance Converter
/tools/luminance-converter/Convert luminance between candela per square metre, nits, foot-lamberts, lamberts and stilbs.
Related categories
Developer
184 tools
Networking
11 tools
Dates & Time
10 tools
Encoding
20 tools
Related tools
Related to tools in Calculators, derived from the tool metadata.
Timestamp Converter
/tools/timestamp-converter/Binary Encoder / Decoder
/tools/binary-encoder/Hex Encoder / Decoder
/tools/hex-encoder/API Key Generator
/tools/api-key-generator/LLM API Request Generator
/tools/llm-request-generator/Octal Encoder / Decoder
/tools/octal-encoder/
Related guides & references
Guides and references covering tools in Calculators, derived from the tool and content metadata.
Calculating Percentage Change Correctly
/article/percentage-change-guide/Percentage Points vs Percent
/article/percentage-points-vs-percent/SI Decimal Prefixes and Binary Prefixes
/article/si-binary-prefixes/How to Convert Units Without Losing Precision
/article/unit-conversion-guide/