Money & borrowing
Subscription annual cost comparison
Compare a monthly subscription with an annual plan for your expected usage period, including the break-even month.
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Developer & data
Summarize a numeric CSV column
Summarize a numeric CSV column: Parse nonblank selected cells as numbers; calculate count, sum, mean, minimum and maximum using decimal arithmetic.
Math & statistics
Survey sample size for a proportion
Plan a survey sample size for a proportion from a confidence level, absolute margin and optional population correction.
Pay & allowances
Tax deduction and allowance saving
Estimate the value of an eligible income deduction at your entered marginal tax rate, capped by taxable income.
Taxes & fees
Tax refund or balance owing
Compare tax already paid with your estimated final liability to see a possible refund or remaining balance.
Unit converters
Temperature converter
Temperature converter: Convert to Kelvin, then to the destination scale: K = °C + 273.15; °F = °C × 9/5 + 32.
Unit converters
Temperature interval
Temperature interval: Scale differences use Δ°F = Δ°C × 9/5 and ΔK = Δ°C.
Text & writing
Text case converter
Text case converter: Apply Unicode upper/lower case, or uppercase each word’s first letter
Text & writing
Text comparison
Text comparison: Compare exact Unicode strings; report first differing code-point position
Business & selling
Tiered marginal commission plan
Tiered marginal commission plan: Apply each rate only to the sales slice inside that cumulative band.
Home & construction
Tile quantity
Tile quantity: Tiles = ceil(area ÷ tile area × (1 + waste/100))
Money & borrowing
Time-weighted investment return
Time-weighted investment return: Compute each subperiod return as end/start −1 and geometrically link the factors.
Money & borrowing
Tip and split the bill
Calculate a tip and split the final bill equally, with a cent allocation that adds up to the total.
Pay & allowances
Total employee cost to employer
Budget salary plus employer payroll contributions, pension and fixed benefits using your entered rates.
Developer & data
Transpose CSV rows and columns
Transpose CSV rows and columns: Treat every CSV row as data and swap row/column indices: output[j][i]=input[i][j].
Geometry
Trapezoid area
Trapezoid area: A = (a + b) × height ÷ 2 (m²)
Pay & allowances
Travel per diem allowance
Total full-day and partial-day business travel allowances, with meal deductions from your travel policy.
Travel & transport
Travel time
Travel time: Hours = distance ÷ speed; excludes stops
Geometry
Triangle area
Triangle area: A = base × perpendicular height ÷ 2 (m²)
Geometry
Triangle solver from three sides
Calculate a triangle’s area, perimeter and three angles from three positive side lengths.
Developer & data
TSV and CSV converter
TSV and CSV converter: Parse the selected source delimiter with quote handling, then serialize with the destination delimiter and spreadsheet formula escaping.
Physics & engineering
Two-solution concentration blend
Two-solution concentration blend: Solve low-volume + high-volume = final volume and low-concentration × low-volume + high-concentration × high-volume = target-concentration × final volume.
Pay & allowances
UK employee National Insurance — annual estimate
Estimate UK 2026–27 employee National Insurance using annual thresholds, with the limits of an annual approximation stated.
Taxes & fees
UK non-savings income tax estimate
UK non-savings income tax estimate: Reduce personal allowance £1 per £2 above £100,000; apply progressive bands to income after allowance. Taxable band upper limits: England 37,700 / 125,140; Scotland 3,967 / 16,956 / 31,092 / 62,430 / 125,140; final
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