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591 results
Finance
72Second Income vs Childcare Break-Even Calculator
NetGain
What a second salary leaves the household after tax, childcare, commuting and withdrawn benefits.
OpenReturn to Office Commute Cost Calculator
TrueCommute
The full cost of office days in cash and hours, and the pre-tax pay rise that would offset it.
OpenDigital VAT Place-of-Supply Calculator
VatRoute
Cross-border digital VAT position, threshold check, and the filing saved by one scheme.
OpenSales Tax Nexus Threshold Calculator
NexusWatch
Whether a state triggers economic nexus, and what multi-state compliance costs.
OpenMath
178Percentage Calculator
PercentSolver
Three percentage modes with step-by-step explanations.
OpenFraction Calculator
FractionFox
Add, subtract, multiply, and simplify fractions.
OpenScientific Calculator
SciDesk
Trig, logs, powers, and a running history tape.
OpenAlgebra Solver
AlgebraEdge
Solve linear and quadratic equations instantly.
OpenHealth & Fitness
58TDEE & Macro Calculator
MacroLab
Daily energy expenditure with personalised macro splits.
OpenBMI Calculator
BodyIndex
Body mass index with healthy-range guidance.
OpenBody Fat Calculator
LeanCheck
US Navy circumference method for body fat percentage.
OpenWater Intake Calculator
HydroPlan
Daily hydration target based on weight, activity, and climate.
OpenConverters
58Inches to Centimeters Converter
LengthWise
Convert inches to centimetres instantly, with the exact 2.54 factor, a reverse converter, and a reference table of commo
OpenCentimeters to Inches Converter
LengthWise
Convert centimetres to inches using the exact 2.54 factor, with a reverse converter and a reference table covering the a
OpenFeet to Meters Converter
LengthWise
Convert feet to metres with the exact 0.3048 factor, a reverse converter, and a table of room, ceiling, and building dim
OpenMeters to Feet Converter
LengthWise
Convert metres to feet by dividing by 0.3048, with a reverse converter and a reference table spanning heights and buildi
OpenBuilt for clarity, not clutter
No sign-ups, no paywalls, no interruptions. Just answers — and the math behind them.
Real-time
Every input updates results instantly. No submit buttons.
Visual
Charts and breakdowns turn raw numbers into decisions.
Private
Calculations run in your browser. Nothing sent to a server.
Works offline
Once loaded, most calculators keep working without a connection.