Present — what is happening now, and what happens habitually
| yo | midoI measure | nosotros | medimoswe measure |
| tú | midesyou measure | vosotros | medísyou all measure |
| él/ella/Ud. | midehe/she measures | ellos/Uds. | midenthey measure |
Present perfect — have —ed; a past still touching now. Spain: today, this week. Latin America: mostly the indefinido instead
| yo | he medidoI have measured | nosotros | hemos medidowe have measured |
| tú | has medidoyou have measured | vosotros | habéis medidoyou all have measured |
| él/ella/Ud. | ha medidohe/she has measured | ellos/Uds. | han medidothey have measured |
Present subjunctive — after que with wishes, doubt, emotion, ojalá
| yo | mida(that) I measure | nosotros | midamos(that) we measure |
| tú | midas(that) you measure | vosotros | midáis(that) you all measure |
| él/ella/Ud. | mida(that) he/she measures | ellos/Uds. | midan(that) they measure |
Present perfect subjunctive — have —ed, under doubt or emotion: no creo que haya venido
| yo | haya medido(that) I have measured | nosotros | hayamos medido(that) we have measured |
| tú | hayas medido(that) you have measured | vosotros | hayáis medido(that) you all have measured |
| él/ella/Ud. | haya medido(that) he/she has measured | ellos/Uds. | hayan medido(that) they have measured |
Preterite — a finished past action — it started, it ended
| yo | medíI measured | nosotros | medimoswe measured |
| tú | medisteyou measured | vosotros | medisteisyou all measured |
| él/ella/Ud. | midióhe/she measured | ellos/Uds. | midieronthey measured |
Imperfect — used to / was —ing; background, habits, descriptions
| yo | medíaI used to measure | nosotros | medíamoswe used to measure |
| tú | medíasyou used to measure | vosotros | medíaisyou all used to measure |
| él/ella/Ud. | medíahe/she used to measure | ellos/Uds. | medíanthey used to measure |
Past perfect — had —ed; further back than another past event
| yo | había medidoI had measured | nosotros | habíamos medidowe had measured |
| tú | habías medidoyou had measured | vosotros | habíais medidoyou all had measured |
| él/ella/Ud. | había medidohe/she had measured | ellos/Uds. | habían medidothey had measured |
Imperfect subjunctive — si clauses and past-tense wishes: si tuviera, quería que fuera
| yo | midiera(that) I measured | nosotros | midiéramos(that) we measured |
| tú | midieras(that) you measured | vosotros | midierais(that) you all measured |
| él/ella/Ud. | midiera(that) he/she measured | ellos/Uds. | midieran(that) they measured |
Imperfect subjunctive — the same tense, second form; commoner in Spain and in writing
| yo | midiese(that) I measured | nosotros | midiésemos(that) we measured |
| tú | midieses(that) you measured | vosotros | midieseis(that) you all measured |
| él/ella/Ud. | midiese(that) he/she measured | ellos/Uds. | midiesen(that) they measured |
Past perfect subjunctive — had —ed, hypothetically: si hubiera sabido
| yo | hubiera medido(that) I had measured | nosotros | hubiéramos medido(that) we had measured |
| tú | hubieras medido(that) you had measured | vosotros | hubierais medido(that) you all had measured |
| él/ella/Ud. | hubiera medido(that) he/she had measured | ellos/Uds. | hubieran medido(that) they had measured |
Preterite perfect — had —ed, immediately before; literary, all but extinct
| yo | hube medidoI had measured | nosotros | hubimos medidowe had measured |
| tú | hubiste medidoyou had measured | vosotros | hubisteis medidoyou all had measured |
| él/ella/Ud. | hubo medidohe/she had measured | ellos/Uds. | hubieron medidothey had measured |
Future — will — (spoken Spanish often prefers voy a + infinitivo)
| yo | mediréI will measure | nosotros | mediremoswe will measure |
| tú | medirásyou will measure | vosotros | mediréisyou all will measure |
| él/ella/Ud. | mediráhe/she will measure | ellos/Uds. | mediránthey will measure |
Conditional — would —; also softens a request into politeness
| yo | mediríaI would measure | nosotros | mediríamoswe would measure |
| tú | mediríasyou would measure | vosotros | mediríaisyou all would measure |
| él/ella/Ud. | mediríahe/she would measure | ellos/Uds. | mediríanthey would measure |
Future perfect — will have —ed; done by some future point
| yo | habré medidoI will have measured | nosotros | habremos medidowe will have measured |
| tú | habrás medidoyou will have measured | vosotros | habréis medidoyou all will have measured |
| él/ella/Ud. | habrá medidohe/she will have measured | ellos/Uds. | habrán medidothey will have measured |
Conditional perfect — would have —ed; the road not taken
| yo | habría medidoI would have measured | nosotros | habríamos medidowe would have measured |
| tú | habrías medidoyou would have measured | vosotros | habríais medidoyou all would have measured |
| él/ella/Ud. | habría medidohe/she would have measured | ellos/Uds. | habrían medidothey would have measured |
Future subjunctive — legal and proverbial only: adonde fueres, haz lo que vieres
| yo | midiere(should) I measure | nosotros | midiéremos(should) we measure |
| tú | midieres(should) you measure | vosotros | midiereis(should) you all measure |
| él/ella/Ud. | midiere(should) he/she measure | ellos/Uds. | midieren(should) they measure |
Imperative (do it) — orders and requests; there is no yo form
| yo | — | nosotros | midamoslet's measure |
| tú | midemeasure! | vosotros | medidmeasure! |
| él/ella/Ud. | midameasure! | ellos/Uds. | midanmeasure! |
Imperative (don't) — no + subjunctive — never the affirmative form with no in front
| yo | — | nosotros | no midamoslet's not measure |
| tú | no midasdon't measure | vosotros | no midáisdon't measure |
| él/ella/Ud. | no midadon't measure | ellos/Uds. | no midandon't measure |

Red = the form breaks the regular pattern. Everything in black you could have worked out from the endings alone.
I — the speaker
| Presente | midoI measure |
| Perfecto | he medidoI have measured |
| Subj. presente | mida(that) I measure |
| Subj. perfecto | haya medido(that) I have measured |
| Futuro | mediréI will measure |
| Condicional | mediríaI would measure |
| Fut. perfecto | habré medidoI will have measured |
| Cond. perfecto | habría medidoI would have measured |
| Subj. futuro | midiere(should) I measure |
| Indefinido | medíI measured |
| Imperfecto | medíaI used to measure |
| Pluscuamp. | había medidoI had measured |
| Subj. imperf. | midiera(that) I measured |
| Subj. -se | midiese(that) I measured |
| Subj. pluscuamp. | hubiera medido(that) I had measured |
| Pret. anterior | hube medidoI had measured |
| Imperativo | — |
| Imper. negativo | — |
we — the speaker plus others
| Presente | medimoswe measure |
| Perfecto | hemos medidowe have measured |
| Subj. presente | midamos(that) we measure |
| Subj. perfecto | hayamos medido(that) we have measured |
| Futuro | mediremoswe will measure |
| Condicional | mediríamoswe would measure |
| Fut. perfecto | habremos medidowe will have measured |
| Cond. perfecto | habríamos medidowe would have measured |
| Subj. futuro | midiéremos(should) we measure |
| Indefinido | medimoswe measured |
| Imperfecto | medíamoswe used to measure |
| Pluscuamp. | habíamos medidowe had measured |
| Subj. imperf. | midiéramos(that) we measured |
| Subj. -se | midiésemos(that) we measured |
| Subj. pluscuamp. | hubiéramos medido(that) we had measured |
| Pret. anterior | hubimos medidowe had measured |
| Imperativo | midamoslet's measure |
| Imper. negativo | no midamoslet's not measure |
you (informal) — one person you are familiar with
| Presente | midesyou measure |
| Perfecto | has medidoyou have measured |
| Subj. presente | midas(that) you measure |
| Subj. perfecto | hayas medido(that) you have measured |
| Futuro | medirásyou will measure |
| Condicional | mediríasyou would measure |
| Fut. perfecto | habrás medidoyou will have measured |
| Cond. perfecto | habrías medidoyou would have measured |
| Subj. futuro | midieres(should) you measure |
| Indefinido | medisteyou measured |
| Imperfecto | medíasyou used to measure |
| Pluscuamp. | habías medidoyou had measured |
| Subj. imperf. | midieras(that) you measured |
| Subj. -se | midieses(that) you measured |
| Subj. pluscuamp. | hubieras medido(that) you had measured |
| Pret. anterior | hubiste medidoyou had measured |
| Imperativo | midemeasure! |
| Imper. negativo | no midasdon't measure |
you all — informal plural, Spain only
| Presente | medísyou all measure |
| Perfecto | habéis medidoyou all have measured |
| Subj. presente | midáis(that) you all measure |
| Subj. perfecto | hayáis medido(that) you all have measured |
| Futuro | mediréisyou all will measure |
| Condicional | mediríaisyou all would measure |
| Fut. perfecto | habréis medidoyou all will have measured |
| Cond. perfecto | habríais medidoyou all would have measured |
| Subj. futuro | midiereis(should) you all measure |
| Indefinido | medisteisyou all measured |
| Imperfecto | medíaisyou all used to measure |
| Pluscuamp. | habíais medidoyou all had measured |
| Subj. imperf. | midierais(that) you all measured |
| Subj. -se | midieseis(that) you all measured |
| Subj. pluscuamp. | hubierais medido(that) you all had measured |
| Pret. anterior | hubisteis medidoyou all had measured |
| Imperativo | medidmeasure! |
| Imper. negativo | no midáisdon't measure |
he, she, you (formal) — one other person — formal you shares it
| Presente | midehe/she measures |
| Perfecto | ha medidohe/she has measured |
| Subj. presente | mida(that) he/she measures |
| Subj. perfecto | haya medido(that) he/she has measured |
| Futuro | mediráhe/she will measure |
| Condicional | mediríahe/she would measure |
| Fut. perfecto | habrá medidohe/she will have measured |
| Cond. perfecto | habría medidohe/she would have measured |
| Subj. futuro | midiere(should) he/she measure |
| Indefinido | midióhe/she measured |
| Imperfecto | medíahe/she used to measure |
| Pluscuamp. | había medidohe/she had measured |
| Subj. imperf. | midiera(that) he/she measured |
| Subj. -se | midiese(that) he/she measured |
| Subj. pluscuamp. | hubiera medido(that) he/she had measured |
| Pret. anterior | hubo medidohe/she had measured |
| Imperativo | midameasure! |
| Imper. negativo | no midadon't measure |
they, you all — several others — plural you shares it
| Presente | midenthey measure |
| Perfecto | han medidothey have measured |
| Subj. presente | midan(that) they measure |
| Subj. perfecto | hayan medido(that) they have measured |
| Futuro | mediránthey will measure |
| Condicional | mediríanthey would measure |
| Fut. perfecto | habrán medidothey will have measured |
| Cond. perfecto | habrían medidothey would have measured |
| Subj. futuro | midieren(should) they measure |
| Indefinido | midieronthey measured |
| Imperfecto | medíanthey used to measure |
| Pluscuamp. | habían medidothey had measured |
| Subj. imperf. | midieran(that) they measured |
| Subj. -se | midiesen(that) they measured |
| Subj. pluscuamp. | hubieran medido(that) they had measured |
| Pret. anterior | hubieron medidothey had measured |
| Imperativo | midanmeasure! |
| Imper. negativo | no midandon't measure |

Red = the form breaks the regular pattern. Everything in black you could have worked out from the endings alone.