Money & borrowing
Inflation and purchasing power
Compare a future price with the purchasing power of a fixed amount under an assumed annual inflation rate.
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Showing 145–168 of 731 tools
Developer & data
Integer base converter
Integer base converter: Parse safe integer in base 2–36 and format in destination base
Money & borrowing
Interest-only loan payment plan
Interest-only loan payment plan: Monthly payment = principal × annual rate / 1200.
Money & borrowing
Internal rate of return (IRR)
Internal rate of return (IRR): enter your own figures, see the result and calculation method, and check the model’s assumptions.
Travel & transport
International money transfer received
Calculate how much a recipient receives after sending fees, an entered exchange rate and a destination-side fee.
Math & statistics
Interpolate values from an XY table
Interpolate values from an XY table: Sort distinct x knots, find the two surrounding knots for each query, and linearly interpolate y between them.
Math & statistics
Interquartile range and outlier fences
Interquartile range and outlier fences with an explained formula, a worked example and checks for invalid or unsupported inputs.
Business & selling
Inventory reorder point
Inventory reorder point: Reorder point = mean daily demand × replenishment lead time + safety stock; round upward to a whole unit.
Business & selling
Inventory turnover and days inventory
Measure annual inventory turnover and average days in inventory using opening and closing stock at cost.
Money & borrowing
Investment annual fee impact
Compare projected investment balances with and without a recurring annual asset-based fee under fixed growth assumptions.
Money & borrowing
Investment return on investment (ROI)
Calculate total investment profit and return percentage, including income and fees you enter.
Business & selling
Invoice aging report
Invoice aging report: Compare each due date with the as-of date.
Business & selling
Invoice payment due date
Invoice payment due date: Add the entered number of calendar days, treating the invoice date as day zero.
Business & selling
Invoice simple interest from an entered rate
Invoice simple interest from an entered rate: Simple interest = unpaid principal × annual rate / 100 × overdue days / selected year-day basis.
Business & selling
Invoice total
Invoice total: Total = subtotal × (1−discount/100) × (1+tax/100)
Developer & data
IPv4 subnet and CIDR calculator
Find an IPv4 network range, subnet mask, broadcast value and conventional usable host range from a CIDR prefix.
Taxes & fees
Ireland income tax — single PAYE employee
Estimate 2026 Irish income tax for a single PAYE employee with full standard personal and employee credits. Excludes USC and PRSI.
Geometry
Irregular polygon area and perimeter
Irregular polygon area and perimeter: Apply the shoelace formula to ordered vertices and sum edge lengths, including the closing edge.
Dates & time
ISO week number
ISO week number: ISO 8601: Monday starts the week; week 1 contains January 4
Developer & data
Join two CSV tables by a key
Join two CSV tables by a key: Match exact parsed key strings using a map.
Developer & data
JSON minifier
JSON minifier: Parse and serialize JSON without optional whitespace
Developer & data
JSON path and type report
JSON path and type report: Walk the JSON structure, using [] for each array item position, and count observed value types at each structural path.
Developer & data
JSON string escape and unescape
JSON string escape and unescape locally in your browser, with clear input requirements, a worked example and an explanation of the result.
Developer & data
JSON structural diff
Compare JSON values structurally and list added, removed or changed paths without treating key order as a change.
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