Reviewed calculators
Browse calculators that have passed the current CalcStack publication gate, with transparent formulas and documented assumptions.
Quadratic Equation
Solve a quadratic equation and report its discriminant and real or complex roots.
Frequency Wavelength
Calculate wavelength from frequency and propagation speed for light, sound or another wave.
Ideal Gas Law
Calculate ideal-gas pressure from amount, absolute temperature and volume.
Gross Margin
Calculate gross profit and gross margin from revenue and direct production costs.
Net Margin
Measure net profit margin after all recorded expenses against total revenue.
Contribution Margin
Calculate contribution per unit and contribution margin for break-even analysis.
Customer Acquisition Cost
Calculate customer acquisition cost by dividing acquisition spend by new customers gained.
Customer Lifetime Value
Estimate customer lifetime value from order value, purchase frequency, lifetime and gross margin.
ROAS
Calculate return on ad spend by comparing attributed revenue with advertising cost.
MRR
Estimate monthly recurring revenue from paying customers and average monthly revenue per user.
ARR
Annualize monthly recurring revenue to estimate an annual recurring revenue run rate.
IPv4 Subnet CIDR
Calculate an IPv4 CIDR block’s network address, broadcast address and address capacity.
Uptime Downtime
Convert an availability percentage into the maximum downtime allowed over a selected period.
Token Cost
Estimate an AI workload’s token cost using separate input and output token prices.
Context Window
Plan an AI context window by measuring prompt usage and reserving space for model output.
Inference Throughput
Measure AI inference throughput as generated tokens and completed requests per second.
Batch Processing Time
Estimate AI batch completion time from item count, average processing time and concurrency.
Model Memory
Estimate memory needed to store AI model parameters at a selected numeric precision.
Embedding Storage
Estimate raw and indexed storage for an AI embedding collection.
GPU Inference Cost
Estimate self-hosted AI inference cost from GPU price, token throughput, utilization and workload volume.
Concrete Volume
Estimate wet concrete volume for a rectangular slab, footing or pad.
Tile Quantity
Estimate tile count for a floor area with a configurable cutting and breakage allowance.
Paint Quantity
Estimate liters of paint from paintable area, manufacturer coverage and coat count.
Roof Pitch
Calculate roof pitch as rise per run, slope percentage and angle from two roof dimensions.
Room Area
Calculate rectangular room floor area for flooring, paint and material estimates.
Ohm's Law
Use Ohm’s law to calculate resistance from voltage and current.
Watts Volts Amps
Calculate electrical power in watts from voltage and current.