Find your tool. Formula, example and result on the same page.
Convert work and heat energy. The calorie is the thermochemical calorie of exactly 4.184 joules, and kWh is energy rather than power.
Convert pressure units using standard atmosphere, bar and pound-force per square inch. Gauge and absolute references are not changed by unit conversion.
Convert newtons, kilonewtons, pound-force and kilogram-force. Kilogram-force uses standard gravity of 9.80665 m/s² and is not mass.
Convert radians, degrees, gradians and full turns. One turn is 2π radians, 360 degrees or 400 gradians.
Convert bits and bytes with explicit decimal and binary prefixes. MB means 1,000,000 bytes; MiB means 1,048,576 bytes.
Convert decimal bit rates and byte rates. One byte contains eight bits; network overhead is not included.
Convert cyclic frequency between hertz, prefixed hertz and revolutions per minute. Angular frequency in radians per second is a different quantity.
Convert acceleration using metres, centimetres or feet per second squared. Standard gravity g₀ is fixed at 9.80665 m/s².
Convert torque between newton-metres and force-length units. Although dimensionally similar to energy, torque is reported as torque, not joules.
Convert mass density rather than weight density. A gram per cubic centimetre equals 1,000 kilograms per cubic metre.
Convert volume per unit time, including US gallons per minute. US liquid gallons are different from Imperial gallons.
Convert mass transported per unit time. No fluid density is assumed because this is not a conversion to volumetric flow.
Convert coulombs and ampere-hours. An ampere-hour is 3,600 coulombs; converting charge to energy also requires voltage.
Convert electric potential difference between volts and metric prefixes. Prefix case matters: mV is millivolts while MV is megavolts.
Convert electrical resistance between ohms and metric prefixes. This changes only the unit, not circuit configuration.
Convert farads, microfarads, nanofarads and picofarads. Each prefix changes the scale by a power of ten.
Convert inductance between henries and metric prefixes. The result does not include frequency-dependent impedance.
Convert illuminance in lux, kilolux and foot-candles. Illuminance measures light arriving per unit area, not lamp power.
Convert thermal conductivity between SI-based units. A kelvin temperature difference has the same magnitude as a Celsius difference.
Convert mass per unit area, useful for paper, sheet materials and coatings. This quantity differs from three-dimensional density.
Find an indexed Fibonacci number using F₀ = 0 and F₁ = 1. Whole-number indices from 0 to 78 are supported.
Add the consecutive integers from 1 through n and count the corresponding triangular arrangement.
Find the single digit obtained by repeatedly adding the decimal digits of a nonnegative whole number.
Compare two nonnegative measurements using their mean as the base, without designating an original value.
Solve two equations ax + by = c and dx + ey = f when their coefficient matrix has a unique solution.
Find the vertex coordinates of y = ax² + bx + c and identify the extremum from the leading coefficient.
Find a triangle’s third side from two known sides and their included angle in degrees.
Solve the remaining triangle sides from two angles and the side opposite the first angle.
Find the minor circular segment area, chord length and arc length from a radius and central angle.
Calculate a spherical cap’s volume, curved area and base radius from the sphere radius and cap height.
Calculate a cylinder with two hemispherical ends using their shared radius and the straight section length.
Find an ellipse’s eccentricity and centre-to-focus distance from its major and minor semiaxes.
Measure the average absolute distance from the arithmetic mean of a numeric list.
Compare paired actual and predicted values with RMSE and mean absolute error in the original measurement unit.
Fit y = mx + b to paired observations by ordinary least squares and evaluate the fitted line at a chosen x.
Find the probability of at most k successes and its strict upper-tail complement in independent fixed-probability trials.
Find the probability of at most k events under a Poisson model with a supplied expected count.
Update a two-category prior using the probability of evidence within each category.
Find the probability that A or B occurs, allowing an explicitly supplied overlap between the events.
Estimate temperature with a constant ambient temperature and a supplied exponential cooling coefficient.
Calculate energy stored in an ideal Hooke-law spring from stiffness and displacement from its relaxed length.
Evaluate p = nRT/V with amount in moles, absolute temperature in kelvin and volume in cubic metres.
Find the wavelength corresponding to a positive momentum magnitude using the SI Planck constant.
Calculate the ideal oscillation frequency and period of an LC circuit from inductance and capacitance.
Newton Second Law: Calculate mass from Force magnitude, Acceleration magnitude. Check the formula, input units and worked result on this page.
Newton Second Law: Calculate acceleration magnitude from Force magnitude, Mass. Check the formula, input units and worked result on this page.
Classical Kinetic Energy: Calculate mass from Energy, Speed. Check the formula, input units and worked result on this page.
Classical Kinetic Energy: Calculate speed from Energy, Mass. Check the formula, input units and worked result on this page.
No matching calculators.
Choose the right calculation
Everyday money
Separate price, tax, fees and repayments with the calculator that matches your transaction. Compare scenarios using the same currency and cost basis.
Investing
Choose a one-time investment, regular contributions or deposit model that matches your cash flows. Compare total contributions alongside projected value.
Pay & work
Choose gross pay conversion or the country-specific payroll calculation that matches your question. Read the pay period and deductions included in the result.
Housing & loans
Compare loan payments and broader housing costs using separate amounts. Keep the financed principal and rate constant when testing another term.
Maths
Choose the operation that matches your percentage, ratio or equation problem. Match each symbol in the formula to the example input.
Dates & age
Choose elapsed days, calendar position or completed age according to your question. Date conventions matter at month ends and around leap days.
Unit converters
Select the quantity, then choose its source and destination units. Read variant names before converting units with similar labels.
Geometry
Choose a shape and enter the dimensions its formula requires. Check whether each label asks for a radius, diameter, perpendicular height or semiaxis.
Statistics
Choose the measure that matches your question about centre, spread or probability. Sample estimates, population measures and probability models use different assumptions.
Physics
Choose the physical quantity you want to find and supply the units required by its equation. Read the model assumptions before applying the result to a real system.
Home & construction
Estimate material quantities or project costs from measured dimensions. Choose the tool matching the material and measurement before comparing prices.