All Calculators
Browse the complete CalcAtlas calculator collection. The tools cover engineering, home and building, money, work, time, automotive, sports, mathematics, conversions, agriculture and shipping.
Choose a calculator below to enter your values and get a practical result with supporting formulas, assumptions and explanations where applicable.
Engineering Calculators
Solve practical engineering calculations involving pipe flow, pressure loss, pumps, electrical systems, manufacturing and solar PV systems. Explore Engineering calculators.
Pipe Pressure Drop Calculator
Calculate pressure loss, head loss, velocity, Reynolds number and Darcy friction factor.
Open calculator →Fire Hose Friction Loss Calculator
Calculate fire hose friction loss in PSI from hose size, water flow and hose length.
Open calculator →Press Brake Tonnage Calculator
Estimate the bending force required for V-die air bending from material strength, thickness, bend length and die opening.
Open calculator →Pump Head Calculator
Calculate pump head and total dynamic head from elevation, pressure differences and system losses.
Open calculator →Wire Voltage Drop Calculator
Calculate voltage drop in copper or aluminium wire from current, voltage, wire size and cable length.
Open calculator →Electrical Load Calculator
Calculate electrical load, kW, kVA, power factor and estimated current for DC, single-phase and three-phase systems.
Open calculator →Solar System Size Calculator
Estimate solar PV system size and number of panels from electricity use, peak sun hours, solar offset and system losses.
Open calculator →Home & Building Calculators
Calculate building materials, roof drainage, pool measurements and home heating costs. Explore Home & Building calculators.
Heating Cost Calculator
Estimate heating running costs using power, daily use, energy price, efficiency or heat-pump COP.
Open calculator →Rebar Weight Calculator
Calculate reinforcing bar weight from rebar size, length and quantity.
Open calculator →Gutter Size Calculator
Estimate roof runoff flow for gutter sizing from drainage area, rainfall intensity and number of downspouts.
Open calculator →Pool Surface Area Calculator
Calculate the surface area of rectangular, circular, oval and kidney-shaped swimming pools.
Open calculator →Money Calculators
Calculate financial and business values including present value, commissions, advertising break-even return and estimated tax savings. Explore Money calculators.
Present Value of Cash Flows Calculator
Calculate the present value of multiple future cash flows using a discount rate, with a period-by-period breakdown.
Open calculator →Commission Calculator
Calculate sales commission, total earnings, required sales for a target commission, or the commission rate from known sales and earnings.
Open calculator →Break-Even ROAS Calculator
Calculate the minimum return on ad spend needed to break even based on your contribution margin.
Open calculator →Tax Shield Calculator
Calculate the estimated tax saving from a deductible expense using the deduction amount and applicable tax rate.
Open calculator →Work & Pay Calculators
Calculate paid time off, vacation accrual and other workplace values. Explore Work & Pay calculators.
Time & Date Calculators
Calculate working hours, time cards and invoice due dates. Explore Time & Date calculators.
Time Card Calculator
Calculate hours worked from start and end times, including unpaid breaks and optional estimated pay.
Open calculator →Invoice Due Date Calculator
Calculate an invoice due date from the invoice date and payment terms, including Net 7, Net 15, Net 30, Net 45, Net 60, Net 90 and custom terms.
Open calculator →Automotive Calculators
Practical calculations for vehicle and journey costs.
Sports Calculators
Practical calculations for sport and performance.
Math Calculators
Practical mathematical tools for geometry and measurement.
Conversions
Convert specialist scientific and technical measurements between commonly used units.
Agriculture Calculators
Practical calculations for agricultural storage and farm measurements.
Shipping & Logistics Calculators
Calculate shipping and freight values for transport, courier and delivery planning.
Finding the right calculator
CalcAtlas groups calculators by the type of problem they solve. Engineering tools cover technical calculations involving fluids, pumps, electrical systems and manufacturing, while Home & Building calculators cover construction, property, drainage and household energy calculations.
Money, Work & Pay, and Time & Date calculators cover financial, workplace and scheduling calculations. Specialist tools for automotive, sports, mathematics, conversions, agriculture and shipping are listed directly on this page.
Each calculator is designed to show more than a final number. Where relevant, the calculator page explains the inputs, formula or method, assumptions and how to interpret the result.