Developer & data
JSON to CSV
JSON to CSV: Serialize an array of flat primitive-valued objects with the same keys as the first row. Prefix spreadsheet formula values with an apostrophe.
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Showing 169–192 of 731 tools
Developer & data
JSON validator and formatter
JSON validator and formatter: Parse JSON without executing it, then serialize with two-space indentation
Developer & data
JWT payload decoder
JWT payload decoder: Decode the base64url JSON payload. Does not verify signatures, trust, issuer, audience or expiry.
Physics & engineering
Kinetic energy
Kinetic energy using clearly labeled inputs, with the formula, a worked example and practical limits explained.
Physics & engineering
LC resonant frequency
LC resonant frequency: For an ideal lumped LC circuit, resonant frequency = 1 / (2π√(L × C)), with L in henries and C in farads.
Dates & time
Leap year checker and year length
Leap year checker and year length with editable inputs, an explained method, a worked example and clearly stated output limits.
Unit converters
Length converter
Length converter: result = amount × source factor ÷ destination factor. Factors are relative to m.
Physics & engineering
Linear momentum
Linear momentum using clearly labeled inputs, with the formula, a worked example and practical limits explained.
Money & borrowing
Loan amortization schedule
See a monthly loan amortization schedule and download principal, interest and balance as a CSV file.
Money & borrowing
Loan payment / EMI
Loan payment / EMI: Monthly payment = P×r/[1−(1+r)^−n], r=annual/12; at zero interest P/n
Money & borrowing
Loan recast payment after a lump sum
Loan recast payment after a lump sum: Subtract the lump sum from principal and recalculate the fixed payment over the entered remaining term at the same rate.
Money & borrowing
Loan-to-value and combined LTV
Loan-to-value and combined LTV: LTV = first loan/property value ×100.
Math & statistics
Logarithm
Logarithm: log(value) ÷ log(base)
Business & selling
Marketing funnel conversion worksheet
Marketing funnel conversion worksheet: Leads = visits × lead conversion; sales = leads × sales conversion.
Business & selling
Markup
Markup: Markup (%) = (price − cost) ÷ cost × 100
Unit converters
Mass converter
Mass converter: result = amount × source factor ÷ destination factor. Factors are relative to kg.
Math & statistics
Matrix inverse and determinant
Matrix inverse and determinant: Use Gauss–Jordan elimination with partial pivoting on [A | I].
Math & statistics
Matrix multiplication worksheet
Matrix multiplication worksheet: Multiply compatible matrices with C[i,j] = Σ A[i,k] × B[k,j].
Math & statistics
Mean confidence interval — known sigma
Calculate a two-sided normal confidence interval for a mean when population standard deviation is known.
Math & statistics
Median
Median: Sort numerically; use the central value or mean of the central two
Dates & time
Meeting time across world time zones
Meeting time across world time zones: Parse a single instant with an explicit offset, then format that instant in each IANA time zone using the browser’s Intl time-zone database.
Developer & data
Merge CSV tables with matching headers
Merge CSV tables with matching headers: Validate that both parsed header rows match exactly, then append all data rows from the second table to the first.
Images & PDFs
Merge PDF files
Merge PDF files: Append every page of each selected unencrypted PDF in selection order.
Pay & allowances
Mileage reimbursement with tiers
Calculate a tiered mileage allowance while accounting for distance already claimed in the current policy year.
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