Calculators built to do the math.

Derivative & Tangent Analyzer

Compute analytical derivatives, evaluate slopes at coordinates, and derive exact tangent line equations.

CALCULUS

area_chart

Definite & Indefinite Integrator

Perform definite and indefinite integration with anti-derivative steps and exact Riemann area evaluation.

LINEAR ALGEBRA

grid_on

3×3 Matrix & Determinants

Compute 3×3 matrix determinants, cofactor expansion terms, matrix trace, and check system invertibility.

MECHANICS

timeline

Kinematics & Motion Laboratory

Model acceleration, initial and final velocities, displacement vectors, and transit durations under constant forces.

Showing 139 calculators in this category

fitness_center

Fitness Calculator Lab

Explore BMI, BMR and TDEE, body fat, macros, running pace and one-rep-max tools in one connected fitness workspace.

monitor_weight

BMI Calculator

Calculate BMI from height and weight with a clear screening reference.

local_fire_department

BMR & TDEE Calculator

Estimate basal metabolic rate and total daily energy expenditure with adjustable activity levels.

accessibility_new

Body Fat Calculator

Estimate body-fat percentage with the U.S. Navy circumference method.

restaurant

Macro Calculator

Turn a calorie target into estimated protein, carbohydrate and fat targets.

directions_run

Running Pace Calculator

Calculate running pace and project common race times from distance and elapsed time.

fitness_center

One-Rep Max Calculator

Estimate one-repetition maximum from a weight and repetitions using the Epley equation.

coronavirus

Virus Spread Calculator

Explore simplified outbreak growth, reproduction number, intervention effects and repeated-exposure transmission probability.

monetization_on

Return on Investment (ROI) Calculator

Calculate return on investment, net gain and ROI percentage from cost and return.

ads_click

ROAS Calculator

Calculate return on advertising spend and revenue generated for every unit of ad spend.

person_add

Customer Acquisition Cost (CAC) Calculator

Calculate the average sales and marketing cost required to acquire a new customer.

loyalty

Customer Lifetime Value (LTV) Calculator

Estimate customer lifetime revenue and gross-profit value from order value, purchase frequency, lifespan and margin.

show_chart

CAGR Calculator

Calculate compound annual growth rate between starting and ending values.

sell

Discount Calculator

Calculate discount savings and final sale price from an original price and discount percentage.

account_balance_wallet

Net Profit Margin Calculator

Calculate net profit margin from revenue and net profit.

pie_chart

Contribution Margin Calculator

Calculate contribution margin and contribution margin ratio for break-even and operating planning.

add_card

Price Increase Calculator

Calculate a new selling price after a percentage price increase.

credit_score

Debt-to-Income Ratio Calculator

Calculate debt-to-income ratio from monthly debt obligations and gross monthly income.

event_repeat

Loan Payoff Calculator

Estimate the months and years required to repay a loan from its balance, rate and payment.

payments

Gross Profit Calculator

Calculate gross profit and gross profit margin from revenue and cost of goods sold.

query_stats

Operating Margin Calculator

Calculate operating margin from revenue and operating profit.

shopping_bag

Average Order Value Calculator

Calculate average revenue generated per order and the order count needed for a revenue target.

sync_alt

Conversion Rate Calculator

Calculate conversion rate from visitors, leads or opportunities and completed conversions.

person_remove

Customer Churn Rate Calculator

Calculate customer churn rate and the corresponding retention rate for a period.

person_pin

Customer Retention Rate Calculator

Calculate the percentage of starting customers retained through a period, excluding newly acquired customers.

handshake

Sales Commission Calculator

Calculate sales commission earned from a deal value and commission rate.

history

Payback Period Calculator

Estimate how long an investment takes to recover from recurring cash benefits.

Revenue Growth Calculator

Calculate revenue growth amount and percentage between two reporting periods.

inventory_2

Inventory Days Calculator

Calculate days inventory outstanding from average inventory and annual cost of goods sold.

reorder

Reorder Point Calculator

Calculate the inventory level at which a new purchase order should be triggered.

autorenew

Subscription Value Calculator

See what a recurring subscription costs per use and explore how usage frequency changes its value.

schedule

Purchase in Work Hours Calculator

Translate a purchase price into the amount of take-home work time it represents.

savings

Savings Growth Planner

Explore how starting savings, monthly contributions, time and a modeled return combine over time.

balance

Break-Even Point Calculator

Calculate break-even units, break-even revenue and contribution margin for a business.

local_fire_department

Cash Burn & Runway Calculator

Calculate monthly cash burn, business runway and projected cash depletion from revenue and expenses.

point_of_sale

Cash Register Change Calculator

Calculate customer change and an efficient cash denomination breakdown for a transaction.

account_balance

Commercial Loan EMI Calculator

Estimate commercial loan payments, total interest and repayment cost from loan terms.

Compound Interest & Contribution Calculator

Project future value from starting capital, recurring monthly contributions, an annual return and a time horizon.

currency_exchange

Currency Exchange Fee Calculator

Calculate exchange fees, effective exchange rates and the real cost of converting currencies.

percent

Gross Margin & Markup Calculator

Convert between gross margin and markup, calculate selling price from cost and estimate product profit.

timer

Freelance Hourly Rate Calculator

Calculate a sustainable freelance hourly rate from income goals, expenses, taxes and billable hours.

inventory_2

Inventory Turnover & Holding Calculator

Calculate inventory turnover, days inventory outstanding and inventory holding costs.

event_busy

Late Fee & Interest Calculator

Calculate late payment fees and interest on overdue invoices or balances.

receipt_long

Sales Tax & VAT Splitter

Calculate tax-inclusive and tax-exclusive prices and split sales tax or VAT from a total.

credit_card

Stripe & PayPal Fee Calculator

Estimate payment processing fees, net payout and the amount to charge to receive a target amount.

bedtime

Sleep Calculator

Find suggested bedtimes or wake times using adjustable sleep-cycle timing and sleep onset.

cloud

Weather Calculator

One weather workspace for snow time, rain timing, sunrise, sunset, daylight, UV and temperature planning.

Compound Interest Calculator

Model compound growth with starting capital and recurring contributions.

account_balance_wallet

Loan Amortization Calculator

Calculate fixed loan payments, total repayment and interest.

home

Mortgage Affordability Calculator

Explore a modeled mortgage payment and loan amount from income, debts and loan terms.

query_stats

Investment Return Calculator

Project modeled investment growth with recurring contributions.

trending_down

Inflation Calculator

Model how an amount changes under an assumed inflation rate.

restaurant

Tip & Bill Split Calculator

Split a bill, add tax and tip, and calculate each share.

sell

Discount & Tax Calculator

Apply a discount and tax in the correct order.

Percentage Change Calculator

Calculate absolute and percentage change.

aspect_ratio

Ratio & Proportion Calculator

Solve and scale ratios interactively.

functions

Quadratic Equation Solver

Solve ax² + bx + c = 0 and inspect the discriminant.

change_history

Pythagorean Theorem Calculator

Find the hypotenuse of a right triangle from its legs.

details

Triangle Calculator

Calculate triangle geometry from three sides.

radio_button_unchecked

Circle Calculator

Calculate area, circumference, diameter and radius.

casino

Probability Calculator

Calculate simple probability and its complement.

speed

Speed Distance Time Calculator

Solve speed, distance or travel time.

fitness_center

Force Calculator

Calculate force, mass or acceleration using Newton’s second law.

bolt

Kinetic Energy Calculator

Calculate kinetic energy and visualize velocity’s squared effect.

vertical_align_bottom

Potential Energy Calculator

Calculate gravitational potential energy.

rocket_launch

Projectile Motion Calculator

Model ideal projectile range, flight time and maximum height.

electrical_services

Ohm Law Calculator

Solve voltage, current or resistance.

view_in_ar

Concrete Calculator

Calculate rectangular concrete volume.

swap_horiz

Unit Converter

Convert kilometers to common length units.

local_gas_station

Fuel Cost Calculator

Estimate fuel use and trip cost.

lightbulb

Electricity Cost Calculator

Estimate appliance electricity consumption and cost.

wb_twilight

Outdoor Comfort Window

Explore a transparent weather comfort heuristic.

wb_sunny

Daylight Calculator

Calculate daylight duration from sunrise and sunset.

height

Pokémon Size Scale

Compare Pokémon height and weight with a human reference using PokeAPI.

fast_forward

Pokémon Speed Timeline

Compare Pokémon base Speed using PokeAPI.

bar_chart

Pokémon Stat Comparison Lab

Compare Pokémon base stats, types, height and weight.

soup_kitchen

Recipe Scaling Calculator

Scale ingredient quantities between serving counts.

widgets

Sugar Cube Tower

Translate sugar grams into approximate physical cubes.

currency_bitcoin

Crypto & Investment ROI Calculator

Calculate investment return, trading fees, net profit and break-even exit price with live CoinGecko API data.

timeline

Kinematics & Acceleration Motion Calculator

Solve classical kinematics equations of motion with rigorous step-by-step LaTeX formula derivations.

analytics

SaaS MRR, Churn & Runway Calculator

Model SaaS unit economics including MRR, ARR, customer churn rate, customer lifetime value (LTV) and CAC payback period.

wb_sunny

Sun & Solar Angles Calculator

Calculate sun position, solar elevation angle, azimuth, solar noon, golden hour times and shadow length for any latitude and day.

nightlight_round

Moon Phase & Lunar Cycle Calculator

Determine current moon phase, illumination percentage, age in synodic cycle, distance to Earth, and next full moon timing.

auto_awesome

Stargazing & Dark Sky Calculator

Evaluate night sky darkness using the Bortle scale, naked-eye limiting magnitude (NELM), artificial sky brightness, and deep-sky visibility.

explore

Night Sky & Celestial Coordinates Calculator

Convert equatorial celestial coordinates (Right Ascension & Declination) into local Altitude and Azimuth for any observer location and sidereal time.

public

Planetary Gravity, Orbit & Travel Calculator

Compare surface gravity across the Solar System, calculate your weight on Mars or Jupiter, and model Keplerian orbital velocities.

rocket

Space Physics & Rocket Equation Calculator

Calculate Tsiolkovsky rocket equation delta-v, escape velocity, gravitational time dilation, and black hole Schwarzschild radius with rigorous math derivations.

Derivative & Tangent Line Calculator

Find polynomial first & second derivatives, evaluate slope f'(x₀), construct tangent line equations, and locate inflection points with full KaTeX steps.

area_chart

Definite & Indefinite Integral Calculator

Evaluate definite and indefinite integrals, compute exact antiderivatives using the Fundamental Theorem of Calculus, and compare numerical Riemann approximations.

grid_on

Matrix Determinant & Inverse Solver

Perform matrix algebra on 3×3 matrices: calculate determinant |A| using cofactor expansion, trace, transpose Aᵀ, and invertible inverse matrix A⁻¹.

linear_scale

Linear Equations Solver (Cramer's Rule)

Solve systems of linear equations using Cramer's Rule determinants (D, Dx, Dy) with complete step-by-step KaTeX evaluation and consistency analysis.

navigation

3D Vector Operations & Cross Product

Compute 3D vector magnitudes, dot product u·v, cross product vector u×v, angle between vectors in degrees & radians, and orthogonal vector projections.

bar_chart

Statistics & Standard Deviation Calculator

Compute arithmetic mean, median, sample standard deviation (s), population standard deviation (σ), variance, sum of squares, and standard error of the mean.

shuffle

Permutations & Combinations (nPr & nCr)

Compute combinations nCr, permutations nPr, factorials, permutations with repetition, and probability odds with step-by-step KaTeX reduction.

tag

Prime Factorization, GCD & LCM Calculator

Find Greatest Common Divisor (GCD/HCF), Least Common Multiple (LCM), and prime factor decomposition using the Euclidean division algorithm.

rotate_right

Complex Numbers & Euler Polar Form

Perform complex arithmetic (addition, subtraction, multiplication, division), compute modulus r, argument θ in degrees and radians, and Euler polar form.

change_history

Trigonometry & Law of Sines/Cosines Solver

Solve triangles using the Law of Cosines and Law of Sines. Computes all 6 trigonometric ratios (sin, cos, tan, csc, sec, cot) and triangle area.

exposure

Logarithm & Change of Base Calculator

Evaluate logarithms with arbitrary base, natural log ln(x), common log log10(x), binary log log2(x), and verify exponential equivalence.

arrow_forward

Limits & Asymptotic Analysis Calculator

Evaluate algebraic and rational limits x → c, detect 0/0 indeterminate forms, apply factoring or L'Hôpital's rule, and inspect left/right limits.

Retirement Savings Calculator

Estimate how current savings and monthly contributions could grow before retirement using compound growth.

Mortgage Payoff Calculator

Estimate mortgage payoff time, total interest and the effect of making extra monthly payments.

Future Value Calculator

Calculate the future value of a starting amount plus recurring contributions under compound growth.

Present Value Calculator

Calculate what a future lump sum is worth today using a chosen discount rate and time period.

Slope Calculator

Calculate the slope, direction and angle of a line from two coordinate points.

Mean, Median & Mode Calculator

Calculate mean, median, mode and range from a six-value sample.

Z-Score Calculator

Calculate how many standard deviations a value is from a mean.

Confidence Interval Calculator

Estimate a two-sided confidence interval from a sample mean, standard deviation, sample size and confidence level.

Density Calculator

Calculate density from mass and volume.

Momentum Calculator

Calculate linear momentum and kinetic energy from mass and velocity.

Power Calculator

Calculate mechanical power from work and elapsed time.

Pressure Calculator

Calculate pressure from applied force and surface area.

Calorie Deficit Calculator

Estimate a daily calorie deficit from maintenance calories and target intake.

Body Surface Area Calculator

Estimate body surface area from height and weight using the Mosteller formula.

Square Footage Calculator

Calculate rectangular floor or surface area and estimate material coverage.

Volume Calculator

Calculate volume for common 3D shapes including rectangular prisms, cylinders and spheres.

P-Value Calculator

Estimate a two-sided p-value from a z statistic using the standard normal distribution.

Variance Calculator

Calculate sample and population variance from six data values.

Coefficient of Variation Calculator

Calculate coefficient of variation from mean and standard deviation.

Linear Regression Calculator

Fit a straight line to paired data and calculate slope, intercept and correlation.

Correlation Coefficient Calculator

Calculate Pearson correlation for paired observations.

Percentile Calculator

Estimate a percentile from an ordered six-value data set.

Quartile Calculator

Calculate quartiles and interquartile range from a six-value data set.

Work Calculator

Calculate mechanical work from force and displacement at an angle.

Spring Force Calculator

Calculate spring force, spring constant or displacement using Hooke's law.

Acceleration Calculator

Calculate acceleration from initial velocity, final velocity and elapsed time.

Wavelength & Frequency Calculator

Calculate wavelength, frequency or wave speed.

Torque Calculator

Calculate torque from force, lever arm and angle.

Electrical Power Calculator

Calculate electrical power, voltage, current or resistance using basic circuit relationships.

Ideal Gas Law Calculator

Calculate one ideal-gas variable from pressure, volume, temperature and amount of gas.

Heat Energy Calculator

Calculate thermal energy transferred from mass, specific heat and temperature change.

Molarity Calculator

Calculate molarity from solute moles and solution volume.

Paint Coverage Calculator

Estimate paint quantity from surface area, coverage rate and number of coats.

Unit Conversion Calculator

Convert common physical units across practical measurement systems.

Dilution Calculator

Calculate final concentration, final volume, or required stock volume for a dilution using C₁V₁ = C₂V₂.

pH Calculator

Calculate pH and pOH from hydrogen or hydroxide ion concentration for aqueous solutions.

Length Converter

Convert length between millimeters, centimeters, meters, kilometers, inches, feet, yards and miles.

Temperature Converter

Convert temperatures between Celsius, Fahrenheit and Kelvin with correct affine formulas.

Islamic Inheritance Calculator (Faraid)

Calculate estate distribution fractions and percentages according to Sharia (Faraid) principles, automatically handling fixed shares, blocks, and adjustments.

Jewish Inheritance Calculator (Halacha)

Explore the traditional biblical and halachic order of asset succession, modeling primogeniture double-shares and genealogical lines.