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Sphere Volume
Calculate the volume enclosed by a sphere from its radius.
Calculate122Everyday & specialist / homeStair Riser Height
Calculate equal riser height from a total rise and riser count.
Calculate123Everyday & specialist / mathematicsPopulation Standard Deviation
Calculate population standard deviation for three values.
Calculate124Everyday & specialist / mathematicsSquare Root
Find the principal nonnegative square root of a real number.
Calculate125Everyday & specialist / engineeringSteady Heat Loss
Estimate steady heat transfer through an assembly from U-value, area, and temperature difference.
Calculate126Everyday & specialist / mathematicsSuccessive Discounts
Apply two consecutive percentage discounts and find the effective discount.
Calculate127Everyday & specialist / homeTile
Estimate whole tile quantities from area and tile dimensions.
Calculate128Everyday & specialist / everyday lifeTip
Calculate a percentage tip and divide the resulting bill equally.
Calculate129Everyday & specialist / mathematicsTrapezoid Area
Find a trapezoid’s area from the parallel sides and perpendicular height.
Calculate130Everyday & specialist / mathematicsTriangle
Find triangle area using the base and perpendicular height.
Calculate131Everyday & specialist / engineeringU-Value from Thermal Resistance
Find thermal transmittance from an entered total assembly resistance.
Calculate132Everyday & specialist / mathematicsTriangular Prism Volume
Calculate the volume of a prism with a triangular cross-section.
Calculate133Everyday & specialist / everyday lifeUnit Price
Compare prices by calculating cost per unit of quantity.
Calculate134Everyday & specialist / mathematicsVector Dot Product
Calculate the dot product of two two-dimensional vectors.
Calculate135Everyday & specialist / businessRemove VAT
Recover the before-tax price from a tax-inclusive total and an entered VAT rate.
Calculate136Everyday & specialist / mathematicsVector Magnitude
Find the length of a three-dimensional vector.
Calculate137Everyday & specialist / mathematicsVolume
Find the volume of a rectangular solid from three dimensions.
Calculate138Everyday & specialist / engineeringVoltage Divider
Find the unloaded output of a two-resistor voltage divider.
Calculate139Everyday & specialist / homeWall Area
Find net rectangular wall area after subtracting doors and windows.
Calculate140Everyday & specialist / homeWater Tank Volume
Estimate water volume in a rectangular tank from internal dimensions.
Calculate141Everyday & specialist / scienceWave Speed
Find wave speed from frequency and wavelength.
Calculate142Everyday & specialist / mathematicsWeighted Average
Find the weighted average of two values with nonnegative weights.
Calculate143Everyday & specialist / scienceMechanical Work
Calculate work done by a constant force over a displacement.
Calculate144Everyday & specialist / mathematicsZ Score
Express a value as a number of standard deviations from a supplied mean.
Calculate145HVAC service / pricingHVAC service Target Margin Quote
Find a quote that retains the chosen margin after revenue-based commission.
Calculate146HVAC service / pricingHVAC service Contribution per Sale
Find the amount a completed sale contributes toward fixed costs.
Calculate147HVAC service / pricingHVAC service Minimum Billable Rate
Calculate a rate floor using hours you can actually bill.
Calculate148HVAC service / pricingHVAC service Overhead per Sale
Spread a monthly fixed cost budget across completed sales.
Calculate149HVAC service / pricingHVAC service Maximum Affordable Discount
Find the discount boundary that still preserves an entered margin.
Calculate150HVAC service / pricingHVAC service Price Increase Impact
Compare revenue after a price increase and assumed volume loss.
Calculate151HVAC service / pricingHVAC service Scope Change Quote
Price a separately agreed change in scope.
Calculate152HVAC service / pricingHVAC service Subcontract Quote Margin
Check retained margin on work delivered by a subcontractor.
Calculate153HVAC service / pricingHVAC service Minimum Service Charge
Cover travel and minimum delivery effort in a small booking.
Calculate154HVAC service / pricingHVAC service Bundle Price Floor
Price a package with shared setup costs.
Calculate155HVAC service / marketingHVAC service Customer Acquisition Cost
Measure combined sales and marketing cost per new customer.
Calculate156HVAC service / marketingHVAC service Expected Contribution per Lead
Estimate first-sale contribution expected from a lead.
Calculate157HVAC service / marketingHVAC service Break-Even ROAS
Find revenue return on ad spend needed to cover advertising from contribution.
Calculate158HVAC service / marketingHVAC service Marketing Contribution ROI
Compare attributed contribution with marketing cost.
Calculate159HVAC service / marketingHVAC service Missed Enquiry Opportunity
Model contribution associated with recovering missed enquiries.
Calculate160HVAC service / marketingHVAC service Follow-Up Improvement Value
Estimate the contribution change from a conversion improvement scenario.
Calculate161HVAC service / marketingHVAC service Acquisition Budget
Work backward from a customer target to a lead-spend scenario.
Calculate162HVAC service / marketingHVAC service Funnel Sales Forecast
Combine explicit funnel-stage assumptions into expected sales.
Calculate163HVAC service / marketingHVAC service Referral Incentive Economics
Check first-sale contribution after a referral incentive.
Calculate164HVAC service / marketingHVAC service Acquisition Payback Period
Estimate how long customer contribution takes to repay acquisition cost.
Calculate165HVAC service / cashHVAC service Cash Runway
Estimate the time until cash is exhausted under constant net burn.
Calculate166HVAC service / cashHVAC service Monthly Cash Projection
Model a constant monthly cash movement over an entered horizon.
Calculate167HVAC service / cashHVAC service Receivable Collection Days
Estimate days of credit sales represented by average receivables.
Calculate168HVAC service / cashHVAC service Cash Conversion Cycle
Combine inventory, collection, and supplier-payment timing.
Calculate169HVAC service / cashHVAC service Working Capital Gap
Compare current assets with liabilities and a chosen buffer.
Calculate170HVAC service / cashHVAC service Customer Deposit Gap
Estimate the pre-completion cash gap after a customer deposit.
Calculate171HVAC service / cashHVAC service Early Payment Discount Cost
Compare a payment discount with the time it accelerates receipt.
Calculate172HVAC service / cashHVAC service Late Invoice Carrying Cost
Estimate an internal financing cost associated with delayed receipt.
Calculate173HVAC service / cashHVAC service Seasonal Cash Reserve
Plan an entered cash buffer for a low-demand season.
Calculate174HVAC service / cashHVAC service Growth Funding Gap
Estimate working cash needed for a sustained sales increase.
Calculate175HVAC service / capacityHVAC service Billable Utilization
Measure the share of available time used for billable delivery.
Calculate176HVAC service / capacityHVAC service Monthly Delivery Capacity
Estimate delivery capacity from usable labour hours.
Calculate177HVAC service / capacityHVAC service Required Delivery Staff
Estimate whole staff equivalents required for a delivery target.
Calculate178HVAC service / capacityHVAC service Overtime versus Extra Staff
Compare entered overtime expense with an additional staffing cost.
Calculate179HVAC service / capacityHVAC service Rework Cost Exposure
Estimate direct cost exposure from repeat delivery work.
Calculate180HVAC service / capacityHVAC service Delivery Backlog
Translate confirmed work into a simple backlog duration.
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