Everyday arithmetic
Fraction to decimal
Fraction to decimal: Numerator ÷ denominator
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Taxes & fees
France income tax — one share, before reliefs
Estimate the 2026 French income-tax scale on 2025 taxable income for one tax share, before décote, reductions and credits.
Taxes & fees
Freelance tax set-aside planner
Plan a tax reserve and remaining cash from freelance revenue after entered expenses, using your chosen reserve rate.
Unit converters
Frequency converter
Frequency converter: result = amount × source factor ÷ destination factor. Factors are relative to Hz.
Math & statistics
Frequency-table mean and variance
Frequency-table mean and variance: Treat each nonnegative integer frequency as a count of repeated observations.
Travel & transport
Fuel economy
Fuel economy: L/100 km = fuel ÷ distance × 100
Travel & transport
Fuel trip cost
Fuel trip cost: Cost = distance/100 × consumption × price/liter
Math & statistics
GCD and LCM of integers
Find the greatest common divisor and least common multiple of two or more integers, including exact large integers.
Math & statistics
Geometric sequence and sum
Find a term and finite sum of a geometric sequence, including ratio zero, one or negative ratios.
Taxes & fees
Germany income tax — basic tariff
Calculate Germany’s 2026 basic income-tax tariff on taxable income, excluding church tax, solidarity surcharge and social contributions.
Physics & engineering
Gravitational potential energy
Gravitational potential energy using clearly labeled inputs, with the formula, a worked example and practical limits explained.
Travel & transport
Great-circle distance between coordinates
Great-circle distance between coordinates: Use the haversine formula on a sphere with mean Earth radius 6,371.0088 km.
Web & design
HEX to RGB and HSL
HEX to RGB and HSL: Parse sRGB hexadecimal channels; convert normalized RGB to cylindrical HSL
Math & statistics
Histogram bin and frequency table
Histogram bin and frequency table: Split the observed range into equal-width bins, using left-inclusive/right-exclusive intervals except that the last bin includes the maximum.
Travel & transport
Holiday and travel budget
Build a trip budget with flights, rooms, daily spending, visa or insurance extras and a contingency allowance.
Physics & engineering
Hooke’s law spring force and energy
Hooke’s law spring force and energy: Within the linear elastic range, restoring force = −k × displacement and stored energy = ½ × k × displacement².
Home & construction
Horizontal cylindrical tank fill volume
Estimate liquid litres in a level horizontal cylindrical tank from diameter, cylindrical length and liquid depth.
Travel & transport
Hotel and tourist tax budget
Estimate local visitor or hotel taxes using a quoted per-person nightly fee or an accommodation tax percentage.
Salary & employment
Hourly to annual salary
Hourly to annual salary: Annual gross = hourly × hours/week × paid weeks/year
Dates & time
Hours to ISO 8601 time duration
Hours to ISO 8601 time duration with editable inputs, an explained method, a worked example and clearly stated output limits.
Money & borrowing
How long will savings last?
Estimate how many month-end withdrawals savings can support under a fixed return and withdrawal amount.
Developer & data
HTML entity encoding
HTML entity encoding: Encode five HTML-sensitive characters as entities; output remains plain text
Physics & engineering
Ideal lever effort force
Ideal lever effort force: Balance moments about the pivot: effort force × effort arm = load force × load arm.
Taxes & fees
Import duty and VAT budget
Plan a landed import cost using goods, shipping, your quoted customs duty, import tax and handling charge.
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