Free online calculators, converters, generators, and reference tools. https://solved.tools/ 2026-10-05T08:17:08.393Z Solved.tools feed generator Copyright (c) 2026 BonCor (Pty) Ltd. For informational use only. https://solved.tools/tools/overtime-calculator 2026-10-01T18:15:59+02:00

Work out overtime pay at time-and-a-half, double time, or 2.5x.

https://solved.tools/tools/steps-to-miles-calculator 2026-10-01T18:15:59+02:00

Convert steps to miles and kilometres, or miles back to steps, using your stride length.

https://solved.tools/tools/depreciation-calculator 2026-10-01T18:15:59+02:00

Depreciate an asset with straight-line, double-declining, or sum-of-years methods.

https://solved.tools/tools/simpson-diversity-index 2026-10-01T18:15:59+02:00

Compute Simpson's Index (D), Simpson's Diversity (1−D), reciprocal (1/D), Shannon-Wiener (H′), Pielou evenness (J), and Berger-Parker dominance (d) from species counts in any sample.

https://solved.tools/tools/shannon-diversity-index-calculator 2026-10-01T18:15:59+02:00

Calculate Shannon diversity H′, Pielou evenness J′, species richness, total abundance, and Simpson diversity (1 − D) from comma-separated species counts.

https://solved.tools/tools/currency-converter 2026-10-01T18:15:59+02:00

Convert between 170+ currencies with live rates.

https://solved.tools/tools/currency-rate-checker 2026-10-01T18:15:59+02:00

Convert between 28 major currencies using the exchange rate you provide. No live feed, you control the rate.

https://solved.tools/tools/mortgage-calculator 2026-10-01T18:15:59+02:00

Monthly repayment, total interest, and overpayment savings.

https://solved.tools/tools/simple-interest-calculator 2026-10-01T18:15:59+02:00

Compute simple interest I = P × r × t, total A = P + I, and a side-by-side compound-interest comparison for any principal, rate, and term.

https://solved.tools/tools/markup-calculator 2026-10-01T18:15:59+02:00

Turn unit cost into a selling price using markup % (added to cost) or margin % (share of price), with profit per unit, markup↔margin conversion and a break-even table.

https://solved.tools/tools/auto-loan-calculator 2026-10-01T18:15:59+02:00

Work out your car finance payments.

https://solved.tools/tools/apr-calculator 2026-10-01T18:15:59+02:00

True annual percentage rate including fees.

https://solved.tools/tools/currency-inflation-adjuster 2026-10-01T18:15:59+02:00

Convert any US dollar amount between two years using the official BLS CPI-U (All Urban Consumers, NSA, 1982-84=100) annual averages. Includes a pre-1913 MeasuringWorth reconstruction, real vs nominal read-outs, cumulative inflation, and an annualised rate.

https://solved.tools/tools/tax-calculator 2026-10-01T18:15:59+02:00

Estimate your income tax liability.

https://solved.tools/tools/solar-payback-calculator 2026-10-01T18:15:59+02:00

Calculate solar panel payback period, lifetime savings, and 25-year ROI.

https://solved.tools/tools/pregnancy-calculator 2026-10-01T18:15:59+02:00

Due date and pregnancy week from last period.

https://solved.tools/tools/protein-intake-calculator 2026-10-01T18:15:59+02:00

Daily protein target in grams from body weight, activity, and goal, with adjustable g/kg, per-meal split, and per-kg-LBM figure.

https://solved.tools/tools/blood-pressure-calculator 2026-10-01T18:15:59+02:00

Classify systolic/diastolic against AHA 2017 and compute MAP, pulse pressure, and 7-day averages.

https://solved.tools/tools/calories-burned-activity 2026-10-01T18:15:59+02:00

Estimate calories burned for walking, running, cycling, swimming, and everyday activities using MET values.

https://solved.tools/tools/factorial-calculator 2026-10-01T18:15:59+02:00

Compute n! (factorial) and n!! (double factorial) for non-negative integers. BigInt precision up to 170!.

https://solved.tools/tools/triangle-calculator 2026-10-01T18:15:59+02:00

Sides, angles, and area of any triangle.

https://solved.tools/tools/prime-factor-calculator 2026-10-01T18:15:59+02:00

Compute the prime factorization of any positive integer (up to 10²⁵ with BigInt). Shows the canonical form, divisor count τ(n), sum of divisors σ(n), and Euler totient φ(n), with a full trial-division step trace.

https://solved.tools/tools/pounds-to-stones 2026-10-01T18:15:59+02:00

Convert pounds to stones and stones + pounds to kilograms using the exact UK definition (1 st = 14 lb, 1 lb = 0.45359237 kg by the 1959 international yard-and-pound agreement). Shows kg, g, oz, US short tons alongside.

https://solved.tools/tools/miles-to-kilometers 2026-10-01T18:15:59+02:00

Convert statute miles to kilometres and vice versa using the exact factor 1 mi = 1.609344 km (international yard-and-pound agreement of 1959). Bonus read-outs in metres, feet and yards.

https://solved.tools/tools/inches-to-centimeters 2026-10-01T18:15:59+02:00

Convert inches to centimetres and vice versa using the exact factor 1 in = 2.54 cm (international yard-and-pound agreement of 1959). Bonus read-outs in mm, m, feet and yards.

https://solved.tools/tools/joules-to-btu 2026-10-01T18:15:59+02:00

Convert joules to BTU (International Table) and BTU to joules. 1 BTU(IT) = 1 055.05585262 J exactly (NIST SP 811). Bonus read-outs in kJ, kWh, cal, kcal, ft·lbf.

https://solved.tools/tools/decimal-to-binary 2026-10-01T18:15:59+02:00

Convert decimal integers and fractions to binary, octal, and hexadecimal. Bidirectional dec ⇄ bin with bonus oct and hex read-outs.

https://solved.tools/tools/statistics-chi-square 2026-10-01T18:15:59+02:00

Chi-square test for independence or goodness of fit with observed vs expected frequencies.

https://solved.tools/tools/linear-regression-calculator 2026-10-01T18:15:59+02:00

Fit an OLS line y = α + β·x to paired X and Y data with slope, intercept, R², r, t, p-value, CI, prediction interval, residuals and scatter plot.

https://solved.tools/tools/margin-of-error-calculator 2026-10-01T18:15:59+02:00

Compute the margin of error, confidence interval, and required sample size for proportions or means (Cochran 1977).

https://solved.tools/tools/anova-calculator 2026-10-01T18:15:59+02:00

Test whether 2-10 group means differ significantly using one-way ANOVA.

https://solved.tools/tools/golden-ratio-calculator 2026-10-01T18:15:59+02:00

Compute phi, segment lengths, total, and a live golden rectangle with nested squares and a spiral.

https://solved.tools/tools/poisson-distribution-calculator 2026-10-01T18:15:59+02:00

Compute Poisson PMF, CDF, mean, variance, and quantile for a rate λ.

https://solved.tools/tools/fraction-simplifier-calculator 2026-10-01T18:15:59+02:00

Simplify fractions to lowest terms using GCD.

https://solved.tools/tools/temperature-converter 2026-10-01T18:15:59+02:00

Celsius, Fahrenheit, and Kelvin.

https://solved.tools/tools/torr-to-pa 2026-10-01T18:15:59+02:00

Convert between torr/mmHg and pascals (Pa). Vacuum science, chemistry, medicine.

https://solved.tools/tools/bar-to-psi 2026-10-01T18:15:59+02:00

Convert between bar and pounds per square inch (psi). 1 bar = 14.5037738 psi exactly.

https://solved.tools/tools/gallons-to-liters 2026-10-01T18:15:59+02:00

Convert between US gallons, UK (imperial) gallons, and liters. 1 US gal = 3.785411784 L exactly; 1 UK gal = 4.54609 L exactly.

https://solved.tools/tools/liters-to-gallons 2026-10-01T18:15:59+02:00

Bidirectional litre ↔ US/UK gallon converter with strict NIST factors and cross-displayed millilitres.

https://solved.tools/tools/feet-meters-converter 2026-10-01T18:15:59+02:00

Convert between feet, metres, inches, yards, miles and all length units.

https://solved.tools/tools/psi-to-bar 2026-10-01T18:15:59+02:00

Bidirectional pressure converter between psi, bar, kPa, atm, MPa, and mmHg with live cross-update.

https://solved.tools/tools/cm-mm-converter 2026-10-01T18:15:59+02:00

Convert between millimetres, centimetres, metres, and inches with sub-mm precision.

https://solved.tools/tools/kelvin-to-celsius 2026-10-01T18:15:59+02:00

Convert Kelvin to Celsius and Celsius to Kelvin instantly. The 273.15 offset is exact by SI definition (BIPM SI Brochure §2.3.1, NIST SP 811). Includes Fahrenheit and Rankine bonuses, round-trip drift indicator, and physical-reference presets (absolute zero, liquid nitrogen, dry ice, lab temp).

https://solved.tools/tools/kelvin-to-fahrenheit 2026-10-01T18:15:59+02:00

Convert Kelvin to Fahrenheit and Fahrenheit to Kelvin instantly. Shows Celsius and Rankine bonus. 0 K = −459.67 °F = −273.15 °C exactly.

https://solved.tools/tools/kph-to-mph 2026-10-01T18:15:59+02:00

Convert kilometres per hour to miles per hour (and back) with exact factors.

https://solved.tools/tools/rot13-cipher 2026-10-01T18:15:59+02:00

Encode and decode text with ROT13, the classic Caesar shift-13 substitution cipher.

https://solved.tools/tools/caesar-cipher-decoder 2026-10-01T18:15:59+02:00

Encode and decode text with the general Caesar shift cipher, pick any shift from 1 to 25 (ROT13, Caesar's shift-3, or any other).

https://solved.tools/tools/digital-storage-converter 2026-10-01T18:15:59+02:00

Convert between bits, bytes, KB, MB, GB, TB, KiB, MiB, GiB, TiB, decimal (SI) and binary (IEC) modes.

https://solved.tools/tools/fuel-efficiency-converter 2026-10-01T18:15:59+02:00

Convert between L/100km, MPG (US), MPG (UK), and km/L instantly.

https://solved.tools/tools/utm-link-builder 2026-10-01T18:15:59+02:00

Build tagged campaign URLs with utm_source, utm_medium, utm_campaign, utm_term, utm_content, and utm_id.