Accurate calculators, explained step by step
Fast, free tools for math, money, home projects, dates and science. Every calculator shows its formula and works on your phone, even offline.
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Popular calculators
- Percentage CalculatorFind a percent of a number, what percent one number is of another, percent change, and percent difference.Math
- Linear Regression CalculatorGet the regression line equation, slope, intercept, r, r², standard error and a scatter plot from pasted x, y data.Math
- Basic CalculatorAn online calculator with a keypad, keyboard support, percent and square root keys, step-by-step order of operations and history.Math
- DRIP CalculatorProject a dividend reinvestment plan year by year: shares, balance, income and yield on cost, with or without reinvesting.Finance
- Grout CalculatorFind how many pounds and bags of tile grout you need from tile size, joint width and area.Home & Construction
- Brick CalculatorCount bricks for a wall by size and joint, minus openings, with waste, cost and a mortar estimate.Home & Construction
- Court Date CalculatorFind a legal deadline in calendar or court days, with FRCP 6 weekend and holiday rules and every skipped day shown.Date & Time
- Nether Portal CalculatorConvert Overworld coordinates to Nether coordinates and back, and see how far a Nether highway saves between two places.Everyday
Math Calculators
View all math calculators (7)- Percentage CalculatorFind a percent of a number, what percent one number is of another, percent change, and percent difference.
- Linear Regression CalculatorGet the regression line equation, slope, intercept, r, r², standard error and a scatter plot from pasted x, y data.
- Complex Number CalculatorComplex arithmetic plus conjugate, modulus, argument, polar and exponential form, integer powers and all nth roots.
- Basic CalculatorAn online calculator with a keypad, keyboard support, percent and square root keys, step-by-step order of operations and history.
- Geometric Mean CalculatorGeometric mean of a list of numbers, or the compound average of growth rates and returns, with steps.
- Cube CalculatorFind a cube's volume, surface area, edge and diagonals from any one measurement, or cube any number (x³).
- Area of a Sector CalculatorSector area, arc length, chord, perimeter and segment area from radius, diameter, angle or arc length.
Finance Calculators
View all finance calculators (3)- DRIP CalculatorProject a dividend reinvestment plan year by year: shares, balance, income and yield on cost, with or without reinvesting.
- Out-the-Door Price CalculatorTotal a car deal with sales tax, fees, rebates and trade-in, and see how much you will finance.
- Points vs Cash CalculatorWork out cents per point on an award booking and see whether points or cash is the better deal for you.
Home & Construction Calculators
View all home & construction calculators (3)- Grout CalculatorFind how many pounds and bags of tile grout you need from tile size, joint width and area.
- Brick CalculatorCount bricks for a wall by size and joint, minus openings, with waste, cost and a mortar estimate.
- Drop Ceiling CalculatorCount ceiling panels, main tees, cross tees, wall angle and hanger wires, with centered border sizes.
Date & Time Calculators
View all date & time calculators (2)Science Calculators
View all science calculators (3)- Exponential Decay CalculatorAmount remaining or time needed for exponential decay, from a percent rate, decay constant or half-life.
- G-Force CalculatorG-force from acceleration, a change in speed over time, or a turn's speed and radius, in g, m/s² and ft/s².
- Dihybrid Cross CalculatorGametes, a 4×4 Punnett square and genotype and phenotype ratios for any two-gene cross.
Everyday & Hobby Calculators
View all everyday calculators (3)- Nether Portal CalculatorConvert Overworld coordinates to Nether coordinates and back, and see how far a Nether highway saves between two places.
- Chmod CalculatorConvert Linux file permissions between checkboxes, octal (755) and symbolic (rwxr-xr-x), with setuid, setgid and sticky bits.
- Barbell CalculatorFind which plates to load on each side of a barbell for a target weight in lb or kg, or add up a loaded bar.
Why people trust CalcEagle
- Formulas you can check. Every calculator shows the formula, a worked example and the steps behind your result.
- Tested math. Each tool is checked against independently worked examples and published references before it goes live. Read our methodology.
- Private by design. Calculations run on your device. We do not see or store the numbers you enter.
- Works anywhere. Fast on phones, and you can install CalcEagle to use saved calculators offline.