Business & selling
Customer acquisition cost (CAC)
Calculate acquisition cost per new customer from the sales and marketing spending for a consistent period.
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Business & selling
Customer lifetime value — simple model
Estimate gross-profit customer lifetime value and net contribution after acquisition cost using your assumptions.
Business & selling
Customer retention and recurring revenue cohort
Customer retention and recurring revenue cohort: At the start of each month record the active cohort and its revenue, then reduce customers by the churn fraction.
Geometry
Cylinder volume
Cylinder volume: V = πr²h (m³)
Dates & time
Date difference
Date difference: Signed calendar days = (UTC end − UTC start)/86,400,000; optional inclusive end
Dates & time
Day of the week for a date
Find the weekday name, day number in the year and leap-year status of a Gregorian calendar date.
Electronics & energy
DC two-wire voltage drop
Calculate resistive voltage drop and wire power loss for a two-conductor DC circuit using entered resistivity.
Money & borrowing
Debt snowball vs avalanche comparison
Debt snowball vs avalanche comparison: Add monthly rounded interest, pay fixed minimums, then allocate all remaining budget to the smallest remaining balance (snowball) or highest rate (avalanche).
Money & borrowing
Debt-to-income ratio
Calculate the percentage of your gross monthly income used by required monthly debt payments.
Home & construction
Deck board spacing and count
Deck board spacing and count: Board count = ceil((deck width + target gap)/(board width+gap)); report exact equal gap if all boards can be full width, otherwise estimate the final rip width.
Business & selling
Dimensional shipping weight
Dimensional shipping weight: Dimensional weight (kg) = length × width × height ÷ divisor
Money & borrowing
Discount calculator
Discount calculator: Final price = price × (1 − discount/100)
Money & borrowing
Discounted payback period
Discounted payback period: enter your own figures, see the result and calculation method, and check the model’s assumptions.
Money & borrowing
Dividend income and yield planner
Dividend income and yield planner: Annual gross dividend = shares × dividend per payment × payments per year.
Digital quantities
Download time
Download time: Seconds = size × 8 ÷ speed; no protocol overhead
Unit converters
Duration converter
Duration converter: result = amount × source factor ÷ destination factor. Factors are relative to second.
Business & selling
Early-payment discount annualized cost
Early-payment discount annualized cost: Period cost of foregoing discount = d/(1−d).
Business & selling
Ecommerce contribution per order
Ecommerce contribution per order: Expected contribution = revenue × (1−refund share) − goods − fulfillment − payment fees − refund share × additional loss − advertising cost.
Business & selling
Economic order quantity (EOQ)
Economic order quantity (EOQ): enter your own figures, see the result and calculation method, and check the model’s assumptions.
Money & borrowing
Effective annual rate
Effective annual rate: Effective rate (%) = [(1 + nominal/n)^n − 1] × 100
Home & construction
Electricity cost
Electricity cost: Cost = watts/1000 × hours × tariff
Money & borrowing
Emergency fund target and shortfall
Plan an emergency savings target from essential spending and months of cover, then see your remaining shortfall.
Unit converters
Energy converter
Energy converter: result = amount × source factor ÷ destination factor. Factors are relative to J.
Money & borrowing
Equivalent annual cost (EAC)
Equivalent annual cost (EAC): enter your own figures, see the result and calculation method, and check the model’s assumptions.
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