Calculator workbench
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Math, geometry, engineering, date and everyday calculations run locally in your browser, with assumptions stated on each tool.
Calculator workbench
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94Weighted Average Calculator
Calculate a weighted mean from paired finite values and nonnegative weights.
Permutation & Combination Calculator
Calculate exact nPr or nCr integers without floating-point rounding.
Factorial Calculator
Calculate an exact factorial for a bounded nonnegative integer.
Exponent & Root Calculator
Calculate a real power or an integer-degree real root with strict domain checks.
Logarithm Calculator
Calculate natural, common or custom-base logarithms for positive values.
Arithmetic Sequence Calculator
Find the nth term and finite sum of an arithmetic sequence.
Geometric Sequence Calculator
Find the nth term and finite sum of a bounded geometric sequence.
Linear Equation Solver
Solve ax + b = 0 from explicit finite coefficients.
Two-Equation System Solver
Solve a nonsingular two-by-two linear system using exact input coefficients.
Matrix Determinant Calculator
Calculate a two-by-two or three-by-three determinant from numeric rows.
2×2 Matrix Inverse
Invert a nonsingular two-by-two numeric matrix and report its determinant.
Vector Magnitude Calculator
Calculate the Euclidean magnitude of a finite numeric vector.
Vector Dot Product Calculator
Calculate the dot product of two equally sized finite vectors.
Coordinate Distance Calculator
Calculate straight-line distance between two 2D or 3D points.
Slope Calculator
Calculate slope and line equation from two distinct 2D points.
Rectangle Calculator
Calculate rectangle area, perimeter and diagonal from positive side lengths.
Trapezoid Calculator
Calculate trapezoid area, solve height, or find perimeter and midsegment from the measurements you know.
Ellipse Calculator
Calculate ellipse area and Ramanujan perimeter approximation from semiaxes.
Circular Sector Calculator
Calculate sector area, arc length and perimeter from radius and central angle.
Regular Polygon Calculator
Calculate perimeter, apothem, interior angle and area from side count and length.
Sphere Calculator
Calculate sphere surface area and volume from a positive radius.
Cylinder Calculator
Calculate cylinder volume and total or lateral surface area.
Cone Calculator
Calculate right-cone slant height, volume and surface areas.
Rectangular Prism Calculator
Calculate volume, surface area and space diagonal of a rectangular prism.
Square Pyramid Calculator
Calculate volume, slant height and surface area of a right square pyramid.
Torus Calculator
Calculate torus surface area and volume from major and tube radii.
Annulus Calculator
Calculate ring area and inner or outer circumferences from two radii.
Ohm's Law Calculator
Solve one missing value among voltage, current and resistance.
Electric Power Calculator
Solve one missing value among power, voltage and current using P = VI.
Series & Parallel Resistance
Combine bounded nonnegative resistor values in series or parallel.
Voltage Divider Calculator
Calculate unloaded divider output, current and resistor power from explicit values.
Series & Parallel Capacitance
Combine bounded positive capacitance values in series or parallel.
Kinetic Energy Calculator
Calculate classical kinetic energy from mass and speed in SI units.
Gravitational Potential Energy
Calculate mgh from user-provided mass, height and gravitational acceleration.
Density, Mass & Volume Calculator
Solve one missing SI value in density (kg/m³) = mass (kg) / volume (m³).
Force, Mass & Acceleration
Solve one missing SI value in force (N) = mass (kg) × acceleration (m/s²).
Pressure, Force & Area
Solve one missing SI value in pressure (Pa) = force (N) / area (m²).
Torque Calculator
Calculate torque from force, lever arm and angle in degrees.
Speed, Distance & Time Calculator
Solve one missing value in distance (km) = speed (km/h) × time (h).
Acceleration Calculator
Calculate average acceleration from initial speed, final speed and elapsed time.
Momentum Calculator
Calculate classical linear momentum from mass and signed velocity.
Wavelength & Frequency Calculator
Convert vacuum wavelength and frequency using the exact speed of light.
Day of Year Calculator
Find the ordinal day, days remaining and leap-year status for an ISO date.
Calendar Month Calculator
Report month length and boundary weekdays for a year-month from 0001 to 9999.
Calendar Quarter Calculator
Find calendar quarter number, start date, end date and ordinal day within it.
Nth Weekday of Month
Find the first through fifth, or last, requested weekday in a calendar month.
Decimal Hours Converter
Convert bounded durations between H:MM:SS and decimal hours.
Work Hours Calculator with Break
Calculate one shift from 24-hour clock times, subtract an unpaid break, and support overnight end times.
Unit Price Calculator
Compare total cost with quantity and calculate cost per unit.
Recipe Scaler
Scale named ingredient quantities by explicit original and target servings.
Paint Coverage Calculator
Estimate paint units from user-entered area, coats, coverage and waste allowance.
Flooring Material Calculator
Estimate required material and whole packages from area, waste and package coverage.
Tile Quantity Calculator
Estimate whole tiles and boxes from shared-unit dimensions, waste and box size.
Concrete Volume Calculator
Estimate rectangular concrete volume from meter dimensions and explicit waste allowance.
Mulch Volume Calculator
Estimate mulch volume from meter area dimensions, centimeter depth and waste allowance.
Wallpaper Roll Calculator
Estimate strips and whole rolls from explicit wall, roll and waste dimensions.
Electricity Cost Calculator
Estimate energy and cost from user-entered power, runtime, days and unit price.
Battery Runtime Calculator
Estimate idealized runtime from capacity, voltage, load and user-entered efficiency.
Download Time Calculator
Estimate transfer time from explicit file size, link speed and efficiency.
Hourly & Annual Gross Pay Converter
Convert hourly and annual gross pay from explicit work hours and weeks.
Gross Margin Calculator
Calculate gross profit, gross margin and cost ratio from revenue and cost of goods sold.
Markup Price Calculator
Calculate selling price, markup amount and resulting gross margin from cost and markup rate.
Simple Interest Calculator
Calculate simple interest and ending balance from principal, annual rate and time.
Compound Interest Calculator
Calculate a compound balance with explicit principal, annual rate, years and compounding frequency.
Fixed Loan Payment Calculator
Calculate fixed periodic payment, total paid and interest for an amortizing loan.
Savings Goal Calculator
Calculate the periodic contribution needed to reach a future-value goal from a current balance.
Return on Investment Calculator
Calculate net gain, return on investment and gain multiple from cost and final value.
Payback Period Calculator
Calculate simple payback time from an initial outlay and constant periodic net cash inflow.
Net Present Value Calculator
Discount a bounded sequence of periodic cash flows and subtract the initial investment.
Straight-Line Depreciation Calculator
Calculate annual depreciation, depreciable base and ending book values.
Declining Balance Depreciation Calculator
Build a declining-balance schedule without depreciating below an explicit salvage value.
Inventory Turnover Calculator
Calculate turnover, average inventory and approximate days inventory held.
Reorder Point Calculator
Calculate demand during lead time plus user-entered safety stock.
DSO Calculator (Days Sales Outstanding)
Calculate days sales outstanding from average receivables, net credit sales and period length.
Accounts Payable Days Calculator
Estimate days payable outstanding from average payables, credit purchases and period length.
Working Capital Calculator
Calculate net working capital and the current ratio from current assets and liabilities.
Cash Burn & Runway Calculator
Calculate gross burn, net burn and cash runway from monthly cash inflow and outflow.
Tiered Sales Commission Calculator
Apply progressive commission tiers to eligible sales above a threshold.
Date Countdown Calculator
Count signed calendar days and full weeks between two ISO dates.
Date Midpoint Calculator
Find the exact midpoint timestamp between two ISO dates or date-times.
Weekend Days Calculator
Count Saturdays and Sundays in an inclusive ISO date range.
Leap Day Counter
List every February 29 in an inclusive date range.
Fiscal Year Calculator
Find fiscal year label, quarter and boundaries for a chosen fiscal start month.
Deadline Buffer Calculator
Subtract workdays or calendar days from a deadline to find an internal due date.
Time Zone Work-Hour Overlap
Find overlapping UTC and local work intervals from two fixed UTC offsets.
Meeting End Time Calculator
Add a duration to a local start time and report same-day or next-day completion.
Multi-Leg Travel Time Calculator
Add bounded travel and transfer durations across multiple trip legs.
Cooking Time Adjuster
Scale a base cooking time by quantity ratio and an explicit user-chosen exponent.
Trip Expense Splitter
Split named expenses equally or by explicit participant weights.
Luggage Weight Distributor
Distribute item weights across a fixed number of bags with a per-bag limit.
Event Capacity Calculator
Calculate floor-based capacity and table seating, then apply the tighter limit.
Moving Box Volume Calculator
Total mixed box volumes from quantity and dimensions in one shared unit.
Garden Plant Spacing Calculator
Estimate rows and plant positions in a rectangular bed from explicit spacing.
Water Tank Fill Time Calculator
Calculate net fill time from tank volume, current volume, inflow and optional outflow.
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