Pay & allowances
Pro rata salary for part-time work
Estimate annual and monthly part-time salary from the fraction of full-time weekly hours you work.
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Business & selling
Profit margin
Profit margin: Margin (%) = (revenue − cost) ÷ revenue × 100
Money & borrowing
Profitability index
Profitability index: enter your own figures, see the result and calculation method, and check the model’s assumptions.
Business & selling
Project critical path and slack
Project critical path and slack: Validate an acyclic dependency graph.
Everyday arithmetic
Proportion solver
Proportion solver: x = b × c ÷ a
Geometry
Pythagorean theorem
Pythagorean theorem: Hypotenuse = √(a² + b²); right triangles only
Web & design
QR code generator
QR code generator: Encode text into a PNG QR code with medium error correction
Math & statistics
Quadratic roots
Quadratic roots: Solve ax² + bx + c = 0 using the discriminant; real roots only
Home & construction
Rainwater collection worksheet
Rainwater collection worksheet: Harvested litres = rainfall mm × roof catchment m² × efficiency fraction; one mm over one m² equals one litre.
Random generators
Random choice
Random choice: Uniform Web Crypto selection of one nonempty trimmed line
Math & statistics
Range
Range: Maximum minus minimum
Everyday arithmetic
Ratio simplifier
Ratio simplifier: Divide each nonnegative integer by its greatest common divisor
Electronics & energy
RC time constant and settling time
RC time constant and settling time using clearly labeled inputs, with the formula, a worked example and practical limits explained.
Education
Reading time
Reading time: Whitespace-delimited words ÷ reading speed; estimate in minutes
Money & borrowing
Real return after inflation
Adjust a nominal return for inflation over the same period to estimate the change in purchasing power.
Everyday arithmetic
Recipe ingredient batch scaler
Recipe ingredient batch scaler: Scale factor = target servings/original servings.
Business & selling
Reconcile two ledgers by reference
Reconcile two ledgers by reference: Aggregate signed amounts by exact reference on each side; list each reference with its two totals and difference.
Geometry
Rectangle area
Rectangle area: A = length × width (m²)
Developer & data
Redact selected JSON fields
Redact selected JSON fields: Parse JSON, validate all pointers against the original document, then replace each selected value with the string [REDACTED].
Money & borrowing
Refinance fee break-even
Refinance fee break-even: New payment uses the fixed-rate annuity formula.
Geometry
Regular polygon dimensions
Regular polygon dimensions: For a regular n-sided polygon, apothem = side / (2 tan(π/n)), perimeter = n × side, and area = perimeter × apothem / 2.
Developer & data
Remove duplicate CSV rows
Remove duplicate CSV rows locally in your browser, with clear input requirements, a worked example and an explanation of the result.
Text & writing
Remove duplicate lines
Remove duplicate lines: Keep the first occurrence of each exact, case-sensitive line; preserve order
Money & borrowing
Rent affordability from a budget ratio
Estimate a monthly rent budget after other housing bills, using the income share you choose.
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