Ready to use
Math, Statistics & Probability
Open tool Hemisphere Volume Calculator
Calculate hemisphere volume with guided inputs, visible equations, substituted working, and model assumptions.
BUILT AROUND THE TASK
Calculators and estimators for clear, repeatable decisions
Find focused calculators that turn stated inputs into estimates you can review, compare, and revise.
Choose a focused workspace
Ready to use
Math, Statistics & Probability
Open tool Heron's Formula Calculator
Calculate heron's formula with guided inputs, visible equations, substituted working, and model assumptions.
Ready to use
Calculators
Open tool Holiday Pay Calculator
Apply a holiday multiplier and separate total pay from premium above base.
Ready to use
Calculators
Open tool Home Equity Calculator
Estimate property equity and equity percentage from value and outstanding mortgage balance.
Ready to use
Calculators
Open tool Home Insurance Cost Calculator
Estimate an annual home-insurance budget from property value and a planning rate.
Ready to use
Calculators
Open tool Home Loan Prepayment Calculator
Compare how a lump sum or monthly top-up could reduce home-loan interest and repayment time.
Ready to use
Physics
Open tool Hooke's Law Calculator
Calculate hooke's law with guided inputs, visible equations, substituted working, and model assumptions.
Ready to use
Calculators
Open tool Hourly to Salary Calculator
Annualize regular and overtime hourly pay across selected paid weeks.
Ready to use
Calculators
Open tool HRA Exemption Calculator
Estimate the three Rule 2A limits using salary, rent, HRA received, and city type.
Ready to use
Calculators
Open tool HSA Contribution Calculator
Estimate remaining health-savings contribution room.
Ready to use
Calculators
Open tool HSA Tax Savings Calculator
Estimate tax savings from an HSA contribution.
Ready to use
Physics
Open tool Hydraulic Force Calculator
Calculate hydraulic force with guided inputs, visible equations, substituted working, and model assumptions.
Ready to use
Physics
Open tool Hydrostatic Force Calculator
Calculate hydrostatic force with guided inputs, visible equations, substituted working, and model assumptions.
Ready to use
Physics
Open tool Hydrostatic Pressure Calculator
Calculate hydrostatic pressure with guided inputs, visible equations, substituted working, and model assumptions.
Ready to use
Math, Statistics & Probability
Open tool Hypergeometric Probability Calculator
Calculate hypergeometric probability with guided inputs, visible equations, substituted working, and model assumptions.
Ready to use
Calculators
Open tool Image Aspect Ratio Calculator
Create a bounded, browser-local image aspect ratio calculator with visible assumptions, review guidance, and downloadable output.
Ready to use
Calculators
Open tool Image Compression Ratio Calculator
Create a bounded, browser-local image compression ratio calculator with visible assumptions, review guidance, and downloadable output.
Ready to use
Calculators
Open tool Image File Size Calculator
Estimate uncompressed image memory from dimensions, colour depth, and image count.
Ready to use
Image Tools
Open tool Image Size Calculator
Report encoded bytes, dimensions, aspect ratio, and decoded memory.
Ready to use
Calculators
Open tool Import Duty Calculator
Estimate import duty from customs value and an entered duty rate.
Ready to use
Finance & Business
Open tool Import Duty Estimate
Build a landed-value scenario from user-supplied customs and import-tax rates.
Ready to use
Physics
Open tool Impulse Calculator
Calculate impulse with guided inputs, visible equations, substituted working, and model assumptions.
Ready to use
Physics
Open tool Inclined Plane Force Calculator
Calculate inclined plane force with guided inputs, visible equations, substituted working, and model assumptions.
Ready to use
Physics
Open tool Inductive Reactance Calculator
Calculate inductive reactance with guided inputs, visible equations, substituted working, and model assumptions.