Subject topic

Math & Numbers

Solve calculations, percentages, units and number conversions.

115 tools in this topic

Solve common number problems and convert values without working through formulas by hand. This collection covers arithmetic, percentages, fractions, units, number systems and practical everyday calculations.

Other tools

4

Voltage Divider CalculatorCalculate unloaded and loaded output voltage, divider current and output resistance.Battery Series & Parallel CalculatorEstimate nominal voltage, amp-hours, watt-hours and total cells for an S/P bank.Series & Parallel Resistance CalculatorCombine up to two hundred positive resistor values in series or parallel.LED Resistor CalculatorEstimate a series resistor and its dissipation from supply, forward voltage and current.

Other tools

4

Dew Point CalculatorEstimate dew point, temperature spread and vapor pressure from temperature and humidity.Air Density CalculatorEstimate moist-air density from temperature, relative humidity and station pressure.Absolute Humidity CalculatorEstimate water vapor per cubic meter, mixing ratio, vapor pressure and air density.Rainfall Rate CalculatorConvert rainfall depth and duration into an average rate and theoretical area volume.

Other tools

2

Reading Finish Date CalculatorProject a finish date from pages remaining, pages per day and chosen reading days.Book Club Schedule GeneratorCreate recurring meeting dates and rotate a list of reading sections.

Other tools

1

Recipe Food Cost CalculatorProrate package prices into ingredient, recipe and per-serving food cost.

Other tools

1

Frame Rate Duration ConverterConvert a frame count to duration and compare the same duration at another frame rate.

Other tools

3

Warehouse Space Utilization CalculatorCompare storage footprint and modeled cube with usable floor and clear height.Cycle Count Schedule GeneratorEstimate daily count assignments with more frequent high-priority counts.Storage Bin Capacity CalculatorEstimate whole-item capacity from internal volume and an editable fill allowance.

Space & Layout Planning Tools

1

Room Layout Capacity CalculatorEstimate whole planning units from room area and an editable area allowance.

Other tools

2

Fundraising Goal CalculatorTranslate a remaining goal into gifts and prospects from editable assumptions.Survey Response Rate CalculatorCompare simple complete and partial participation with an entered target.

Other tools

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Raised Bed Soil CalculatorEstimate soil volume, cubic yards, liters and whole bags.

Other tools

2

EV Charging Time CalculatorEstimate charging time and wall energy from battery, charge window and charger power.Tire Size Comparison CalculatorCompare overall diameter, clearance and speedometer effect for two tire sizes.

Music & Audio Tools

2

BPM Delay CalculatorConvert tempo into whole, dotted and triplet note delay times.Song Duration CalculatorEstimate playback length from BPM, bars, beats per bar and pickup beats.

Other tools

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Timelapse Duration CalculatorPlan frame count, playback length and source-image storage.

Other tools

2

Quilt Block Layout CalculatorCalculate a block grid, total block count and square cut size.Yarn Skein CalculatorRound a length requirement and extra allowance to whole skeins.

Outdoor & Camping Tools

3

Hiking Time & Elevation CalculatorEstimate hiking time from trail distance, total ascent, travel rates and planned breaks.Trail Gradient CalculatorConvert horizontal distance and elevation change into grade, angle and rise-to-run ratio.Tent Footprint Area CalculatorEstimate cleared site dimensions and a single-row layout for multiple shelters.

Home Improvement & DIY Tools

4

Roof Pitch CalculatorConvert rise-over-run into angle, slope factor, rafter span and simple gable roof area.Stair Stringer CalculatorCalculate riser count, actual rise, tread count, total run and straight stringer span.Deck Board Layout CalculatorEstimate board rows, linear footage and whole stock boards from deck dimensions.Fence Post Spacing CalculatorDivide equal straight runs into sections at or below a selected maximum spacing.

Other tools

2

Battery Runtime CalculatorConvert battery volts and amp-hours into usable energy and ideal load runtime.Rainwater Collection CalculatorEstimate captured rainfall, storage used and potential overflow from a catchment.

Other tools

3

Swimming Pace CalculatorConvert total distance and time into pace, pool lengths and average speed.Cycling Gear Ratio CalculatorCalculate ratio, gear inches, development and speed at a selected cadence.Round-Robin Schedule GeneratorRotate up to forty participants through a single or double round-robin schedule.

Calculators

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Normal Distribution CalculatorCalculate probability below, between and above entered bounds for a normal model with visible z-scores.Mechanical Power CalculatorConvert work over time into average watts, kilowatts and mechanical horsepower without hidden efficiency.Hydrostatic Pressure CalculatorCalculate gauge and absolute pressure at depth for a static constant-density fluid.Rectangle CalculatorCalculate rectangle area, perimeter and diagonal from positive length and width measurements.Sample Size CalculatorEstimate completed responses for a proportion from confidence, margin, prevalence and population inputs.Margin of Error CalculatorEstimate an uncorrected normal-approximation margin for a sample proportion and confidence level.Trapezoid CalculatorCalculate trapezoid area, entered perimeter and midsegment from bases, height and side lengths.Cylinder CalculatorCalculate volume, total surface area and lateral area for a closed right circular cylinder.Linear Thermal Expansion CalculatorEstimate signed length change, final length and relative expansion from temperature change.Variance CalculatorCalculate population variance, sample variance and sample standard deviation from a browser-local number list.