Free Online Calculators
Finance, math, health, construction, and everyday tools in one searchable catalog.
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Stair Stringer Calculator — Rise, Run & Layout
Standard Deviation Calculator
Statutory Redundancy Pay
Steel Tube Roof Truss Calculator — Loads & Deflection
Stud Wall Calculator — Layout & Lumber List
Time Calculator — Hours, Duration & Timesheet
Tip Calculator
Titration Calculator — Concentration, Volume & Repeated Trials
Triangle Calculator
UK Inflation Calculator
Water intake calculator — daily hydration range
Wheel Offset Calculator — Compare ET, Width & Spacers
Calculator descriptions
Stair Stringer Calculator — Rise, Run & Layout
Plan a straight staircase, fit the available space and compare riser counts. See a proportional drawing and print your dimensions in inches or millimetres.
Standard Deviation Calculator
Calculate sample or population standard deviation from a list or frequency table. Explore real data points, their distances and contributions to spread.
Statutory Redundancy Pay
Estimate UK statutory redundancy pay with age bands, GB and Northern Ireland limits, a year-by-year breakdown and a redundancy-only offer comparison.
Steel Tube Roof Truss Calculator — Loads & Deflection
Build a gable, mono-pitch or arched rectangular-tube truss and calculate roof loads, reactions, member forces, deflection, tube mass and a cut schedule.
Stud Wall Calculator — Layout & Lumber List
Lay out regular wall studs and rough door or window openings, then see a transparent preliminary lumber list.
Time Calculator — Hours, Duration & Timesheet
Add or subtract time, find hours between clocks, total timesheet shifts and pay, or convert duration units with clear visual results.
Tip Calculator
Calculate restaurant tips before or after tax, split the bill equally or by custom shares, round the total, and see exactly what each person pays.
Titration Calculator — Concentration, Volume & Repeated Trials
Solve titration concentration or volume from a balanced reaction. Analyse repeated direct titrations with blank correction, dilution and a transparent report.
Triangle Calculator
Solve a triangle from three known measurements. See all sides, angles, area and heights, and compare both possible SSA shapes on one scale.
UK Inflation Calculator
Compare the buying power of pounds between two months and check whether your income has kept up.
Water intake calculator — daily hydration range
Estimate a practical daily drinking range from weight, exercise and heat, with glasses, hourly pace and transparent adjustments.
Wheel Offset Calculator — Compare ET, Width & Spacers
Compare wheel positions, save candidate setups and find an offset range from your entered movement limits. Keep nominal reference edges separate from measured wheel lips.
