Money & borrowing
Compare three investment return scenarios
Compare three investment return scenarios: For each entered nominal annual return, apply rate/12 monthly before adding the end-of-month contribution.
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Money & borrowing
Compare two loan offers
Compare two loan offers: Amortize both offers with rounded monthly interest and a final balance adjustment; compare all payments plus upfront fees.
Business & selling
Compare two payment fee quotes
Compare two payment-processing quotes with percentage and fixed charges, showing fees and the cheaper option.
Math & statistics
Complex number arithmetic
Complex number arithmetic: Use componentwise addition/subtraction, (a+bi)(c+di)=(ac−bd)+(ad+bc)i, and multiply by the divisor’s conjugate for division.
Money & borrowing
Compound annual growth rate (CAGR)
Find the annualized growth rate between a positive starting value and a non-negative ending value.
Money & borrowing
Compound interest
Compound interest: Balance = P × (1 + r/n)^(n×years), without contributions
Home & construction
Concrete quantity
Concrete quantity: Cubic meters = length × width × thickness/100 × (1+waste/100)
Geometry
Cone volume
Cone volume: V = πr²h ÷ 3 (m³)
Geometry
Coordinate distance
Coordinate distance: Euclidean distance = √((x₂−x₁)² + (y₂−y₁)²)
Math & statistics
Covariance of paired data
Covariance of paired data with an explained formula, a worked example and checks for invalid or unsupported inputs.
Developer & data
CRC-32 text checksum
Calculate the standard reflected CRC-32 checksum of the exact UTF-8 bytes of text you enter.
Money & borrowing
Credit card balance transfer comparison
Credit card balance transfer comparison: Compare monthly rounded-interest payoff under the original rate with a transferred balance including the percentage fee, promo months and a later rate.
Money & borrowing
Credit card payoff time
Estimate the time and interest needed to clear a credit card with fixed monthly repayments and no new spending.
Money & borrowing
Credit utilization ratio
Calculate the share of available revolving credit currently used by your entered balances.
Education
Credit weighted GPA
Credit weighted GPA: Σ(grade points × credits) ÷ total credits; user supplies the grading model
Web & design
CSS border-radius generator
CSS border-radius generator with editable inputs, an explained method, a worked example and clearly stated output limits.
Web & design
CSS box-shadow generator
CSS box-shadow generator with editable inputs, an explained method, a worked example and clearly stated output limits.
Web & design
CSS linear gradient generator
Generate and copy a CSS linear-gradient declaration from two HEX colors and an angle.
Developer & data
CSV pivot by group and sum
CSV pivot by group and sum: Group exact cell strings and sum the selected numeric column with decimal arithmetic.
Developer & data
CSV to JSON
CSV to JSON: Parse CSV header row into an array of string-valued objects; reject duplicate or empty headers.
Developer & data
CSV to Markdown table
CSV to Markdown table locally in your browser, with clear input requirements, a worked example and an explanation of the result.
Geometry
Cuboid volume
Cuboid volume: V = length × width × height (m³)
Regional utilities
Currency at a manual rate
Currency at a manual rate: Destination amount = source amount × manually supplied exchange rate
Business & selling
Custom processing fee
Custom processing fee: Fee = gross × percentage/100 + fixed fee
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