Math Tools
From percentages to complex numbers — accurate, instant math calculators for students, teachers and professionals.
83 free tools · everything runs in your browser
Rectangle Area Calculator
Compute the area, perimeter and diagonal of any rectangle instantly.
Open ToolPrime Number Calculator
Check primality, find factors, prime factorization, divisors and the next prime.
Open ToolQR Decomposition Calculator
Decompose a matrix into orthogonal Q and upper triangular R matrices.
Open ToolJacobian Matrix Calculator
Compute the Jacobian matrix of multivariable functions at a given point.
Open ToolConvolution Calculator
Compute the discrete convolution of two sequences for signal processing.
Open ToolSalary Calculator
Calculate net salary after deductions. Convert between hourly, monthly, and annual salary.
Open ToolFreelance Rate Calculator
Calculate your ideal freelance hourly rate based on expenses and income goals.
Open ToolProject Cost Estimator
Estimate project costs based on resources, time, and expenses. Plan budgets effectively.
Open ToolSaaS Pricing Calculator
Calculate SaaS pricing for your software product. Plan subscription tiers.
Open ToolLife Expectancy Calculator
Estimate life expectancy based on lifestyle factors. For informational purposes.
Open ToolDegree Day Calculator
Calculate heating and cooling degree days from daily temperature logs with adjustable base temperature.
Open ToolTax Saver Planner
Estimate income tax saved under India's 80C, 80D and HRA deductions with a clear slab-wise breakdown.
Open ToolInflation Calculator
See what today's money is worth in the past or future at any annual inflation rate.
Open ToolNPS Calculator
Project your NPS corpus with monthly contributions, expected returns and annuity split at age 60.
Open ToolDCF Valuator
Discounted cash flow valuation: present value of projected free cash flows plus terminal value.
Open ToolPregnancy Due Date Calculator
Estimated due date from your last menstrual period with week-by-week trimester milestones.
Open ToolIdeal Weight Calculator
Healthy weight range for your height and frame using the Devine, Robinson, Miller and Hamwi formulas.
Open ToolMacro Calculator
Daily protein, carb and fat targets from your calories, body goal and activity level.
Open ToolTDEE Calculator
Total daily energy expenditure via the Mifflin-St Jeor equation with activity multiplier and cut/bulk targets.
Open ToolStatistics Calculator
Paste numbers to get mean, median, mode, variance, standard deviation and percentiles.
Open ToolProbability Calculator
Calculate probabilities for dice, coins, cards and combinations with step-by-step formulas.
Open ToolSet Operations Calculator
Union, intersection, difference and symmetric difference of two sets with a Venn diagram preview.
Open ToolVariance Calculator
Compute mean, variance and standard deviation for population or sample data with a step-by-step formula breakdown.
Open ToolWeighted Average Calculator
Enter value-weight pairs and get the weighted average instantly, with a simple-average comparison.
Open ToolExponential Growth Calculator
Project growth or decay from an initial value, rate and time — doubling time, rule of 72 and a year-by-year table.
Open ToolRemainder Calculator
Divide two integers and get the quotient, remainder and the full a = b × q + r equation.
Open ToolFactorial Calculator
Compute n! exactly with BigInt, trailing zeros, prime-factor breakdown and a Stirling approximation.
Open ToolComplex Number Calculator
Add, subtract, multiply, divide and find modulus, argument, conjugate, powers and roots of complex numbers.
Open ToolTrigonometry Calculator
Get sin, cos, tan and their inverses for any angle, plus a right-triangle solver from an angle and a side.
Open ToolGPA to Letter Grade Converter
Convert percentage grades to letter grades and 4.0-scale GPA points, and back, on the standard US scale.
Open ToolWatts Amps Volts Calculator
Solve AC power problems: from voltage, current and power factor get kW, kVA, HP and BTU/h for single or three-phase circuits.
Open ToolVoltage Divider Calculator
Get output voltage, current and per-resistor power from Vin and two resistors, with formula and ratio breakdown.
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