Conversion Rate Calculator

Calculate the percentage of visitors or leads that complete a desired action. Compare against a benchmark to gauge performance.

Inputs

Conversion Rate
Formula: Conversion Rate = (Conversions ÷ Total Visitors) × 100

Percentage Change Calculator

Measure the relative change between two values — useful for MoM, QoQ, or YoY reporting.

Inputs

Percentage Change
Formula: % Change = ((New − Old) ÷ |Old|) × 100

Sample Size Calculator

Determine the minimum sample size needed for a survey or experiment to achieve statistically valid results.

Inputs

Required Sample Size
Formula: n₀ = Z² × p(1−p) / e² → adjusted: n = n₀ / (1 + (n₀−1)/N)

A/B Test Significance Calculator

Determine whether the observed difference between control and variant is statistically significant using a two-proportion Z-test.

Control (A)

Variant (B)

Test Result
Two-proportion Z-test: Z = (p̂B − p̂A) / √[ p̂(1−p̂)(1/nA + 1/nB) ]

Confidence Interval Calculator

Calculate the range within which the true population mean is likely to fall, given your sample data.

Inputs

Confidence Interval
CI = x̄ ± Z × (s / √n) | Margin of Error = Z × (s / √n)

ROI Calculator

Measure the return on any investment. Useful for marketing campaigns, tooling costs, or project post-mortems.

Inputs

ROI
ROI = ((Revenue − Cost) ÷ Cost) × 100 | Net Profit = Revenue − Cost

Customer Acquisition Cost (CAC)

Calculate how much it costs to acquire a single new customer. Essential for evaluating marketing efficiency and validating spend against CLV.

Inputs

Cost per Customer Acquired
CAC = Total Marketing & Sales Spend ÷ New Customers Acquired

Customer Lifetime Value (CLV)

Estimate the total profit a single customer generates over their entire relationship with the business. Pair with CAC for a complete acquisition health check.

Inputs

Customer Lifetime Value (Profit)
CLV = Avg Purchase Value × Purchase Frequency × Lifespan × (Gross Margin ÷ 100)

Campaign ROAS Calculator

Return on Ad Spend — measures revenue generated per dollar of advertising spend. Key metric for evaluating paid channel performance.

Inputs

Return on Ad Spend
ROAS = Revenue ÷ Ad Spend | Break-even ROAS = 1 ÷ Gross Margin %

EBITDA Margin Calculator

Compute EBITDA and margin for financial health analysis, M&A due diligence, and executive reporting. Mirrors the work done at Signet Jewelers.

Inputs

EBITDA Margin
EBITDA = Net Income + Interest + Taxes + D&A | Margin = EBITDA ÷ Revenue × 100

Budget Variance Calculator

Measure the difference between planned and actual figures — and determine whether it's favorable or unfavorable based on the item type.

Inputs

Budget Variance
Variance = Actual − Budget | Variance % = (Actual − Budget) ÷ |Budget| × 100

Churn Rate & MRR Impact Calculator

Calculate monthly customer churn rate and quantify its revenue impact on MRR and ARR — critical for SaaS and subscription product tracking.

Inputs

Monthly Churn Rate
Churn Rate = (Customers Lost ÷ Customers at Start) × 100 | MRR Lost = Churn Rate × MRR | ARR Impact = MRR Lost × 12

Forecast Accuracy (MAPE)

Mean Absolute Percentage Error — evaluates how close forecasts are to actuals. Used to benchmark ML models and business forecasts. Enter up to 6 actual vs. forecast pairs.

Actual vs Forecast Pairs

# ACTUAL FORECAST 1 2 3 4 5 6
Mean Absolute Percentage Error (MAPE)
MAPE = (1/n) × Σ |Actual − Forecast| ÷ |Actual| × 100 | Accuracy = 100 − MAPE
🔒

Contributor Access Only

This calculator is part of the full Data Analyst Calculator — all 13 tools included. It's yours when you back DataLearn at any tier starting at $25.

View Contribution Tiers →