Money & borrowing
Rent versus buy net-worth scenario
Rent versus buy net-worth scenario: The renter invests the down payment plus purchase closing costs.
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Money & borrowing
Rental cash-on-cash return
Rental cash-on-cash return: Annual cash flow = collected rent − operating costs − financing payments.
Money & borrowing
Rental property capitalization rate
Rental property capitalization rate: enter your own figures, see the result and calculation method, and check the model’s assumptions.
Education
Required final exam score
Required final exam score: Required score = [target − current × (1−weight)] ÷ weight
Images & PDFs
Resize and convert image
Resize and convert image: Decode JPEG, PNG or WebP, fit inside maximum dimensions preserving aspect ratio, then re-encode as PNG/JPEG/WebP. Metadata is not explicitly copied.
Money & borrowing
Retirement income gap and target pot
Retirement income gap and target pot: Annual funding gap = max(0, spending − other income).
Text & writing
Reverse line order
Reverse line order: Reverse newline-delimited lines without changing line contents
Everyday arithmetic
Reverse percentage
Reverse percentage: Original = final ÷ (1 + increase/100)
Business & selling
Reverse processing fee
Reverse processing fee: Required gross = (target net + fixed fee) ÷ (1 − percentage/100), rounded up to the next cent
Text & writing
Reverse text
Reverse text: Reverse Unicode code points; combining sequences may separate
Business & selling
ROAS and advertising break-even
ROAS and advertising break-even: ROAS = attributed revenue / ad spend.
Home & construction
Roof pitch and slope angle
Convert measured roof rise and horizontal run into an angle, slope percentage and an x-in-12 roof pitch.
Math & statistics
Root mean square (RMS)
Root mean square (RMS) with an explained formula, a worked example and checks for invalid or unsupported inputs.
Images & PDFs
Rotate PDF pages
Rotate PDF pages: Add a clockwise rotation of 90, 180 or 270 degrees to all pages.
Travel & transport
Running pace
Running pace: Pace = minutes ÷ kilometers
Business & selling
Safety stock with fixed lead time
Safety stock with fixed lead time: Safety stock = z × daily demand standard deviation × √lead-time days, rounded upward.
Pay & allowances
Salary to hourly, monthly and annual pay
Convert gross salary between annual, monthly, weekly, daily and hourly pay using your paid work schedule.
Business & selling
Sales-mix break-even batches
Sales-mix break-even batches: Contribution per mix batch = Σ mix quantity × (selling price − variable cost).
Money & borrowing
Savings goal contribution
Savings goal contribution: Monthly saving = max(0, target − current) ÷ months; zero growth model
Money & borrowing
Savings with monthly contributions
Project a savings balance from an initial deposit and recurring monthly contributions, with interest and timing shown.
Everyday arithmetic
Scientific notation
Scientific notation: Express the number as a coefficient multiplied by a power of ten
Random generators
Secure password generator
Secure password generator: Uniform selection with rejection sampling from a 72-character alphabet using Web Crypto
Random generators
Secure random integer
Secure random integer: Uniform rejection sampling using Web Crypto; inclusive bounds
Developer & data
Select a JSON value with JSON Pointer
Select a JSON value with JSON Pointer: Traverse own properties and array indices using RFC 6901 JSON Pointer.
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