diff --git a/src/lib/commands/coll.c b/src/lib/commands/coll.c
index 854eb7d7..e6439d76 100644
--- a/src/lib/commands/coll.c
+++ b/src/lib/commands/coll.c
@@ -99,7 +99,7 @@ coll(void)
 	   xyas(x, y, player->cnum), cname(loan.l_lonee));
 	return RET_FAIL;
     }
-    pay = dchr[sect.sct_type].d_value * ((float)sect.sct_effic + 100.0);
+    pay = dchr[sect.sct_type].d_value * (sect.sct_effic + 100.0);
     for (i = 0; ichr[i].i_name; i++) {
 	if (ichr[i].i_value == 0 || ichr[i].i_uid == I_NONE)
 	    continue;
diff --git a/src/lib/commands/enli.c b/src/lib/commands/enli.c
index ca3a73a4..2f38c635 100644
--- a/src/lib/commands/enli.c
+++ b/src/lib/commands/enli.c
@@ -135,7 +135,7 @@ enli(void)
 	natp->nat_reserve -= totalmil;
 	putnat(natp);
     }
-    if ((player->btused += roundavg((float)totalmil * 0.02)) > 0)
+    if ((player->btused += roundavg(totalmil * 0.02)) > 0)
 	pr("Paperwork at recruiting stations ... %d\n", player->btused);
     return RET_OK;
 }
diff --git a/src/lib/commands/fuel.c b/src/lib/commands/fuel.c
index 1917e1dc..43c22698 100644
--- a/src/lib/commands/fuel.c
+++ b/src/lib/commands/fuel.c
@@ -179,7 +179,7 @@ fuel(void)
 
 		fueled = 1;
 		if ((pet_amt * 5) >= move_amt) {
-		    extra = ((float)move_amt / 5.0) - (move_amt / 5);
+		    extra = move_amt / 5.0 - move_amt / 5;
 		    if (extra > 0.0)
 			sect.sct_item[I_PETROL]
 			    = MAX((pet_amt - move_amt / 5) - 1, 0);
@@ -189,7 +189,7 @@ fuel(void)
 		} else {
 		    sect.sct_item[I_PETROL] = 0;
 		    move_amt -= pet_amt * 5;
-		    extra = ((float)move_amt / 50.0) - (move_amt / 50);
+		    extra = move_amt / 50.0 - move_amt / 50;
 		    sect.sct_item[I_OIL] = MAX(oil_amt - move_amt / 50, 0);
 		    if (extra > 0.0)
 			sect.sct_item[I_OIL]
@@ -255,7 +255,7 @@ fuel(void)
 
 		fueled = 1;
 		if ((pet_amt * 5) >= move_amt) {
-		    extra = ((float)move_amt / 5.0) - (move_amt / 5);
+		    extra = move_amt / 5.0 - move_amt / 5;
 		    if (extra > 0.0)
 			item2.ship.shp_item[I_PETROL]
 			    = MAX((pet_amt - move_amt / 5) - 1, 0);
@@ -265,7 +265,7 @@ fuel(void)
 		} else {
 		    item2.ship.shp_item[I_PETROL] = 0;
 		    move_amt -= pet_amt * 5;
-		    extra = ((float)move_amt / 50.0) - (move_amt / 50);
+		    extra = move_amt / 50.0 - move_amt / 50;
 		    item2.ship.shp_item[I_OIL]
 			= MAX(oil_amt - (move_amt / 50), 0);
 		    if (extra > 0.0)
@@ -340,7 +340,7 @@ fuel(void)
 
 		fueled = 1;
 		if ((pet_amt * 5) >= move_amt) {
-		    extra = ((float)move_amt / 5.0) - (move_amt / 5);
+		    extra = move_amt / 5.0 - move_amt / 5;
 		    if (extra > 0.0)
 			sect.sct_item[I_PETROL]
 			    = MAX((pet_amt - move_amt / 5) - 1, 0);
@@ -350,7 +350,7 @@ fuel(void)
 		} else {
 		    sect.sct_item[I_PETROL] = 0;
 		    move_amt -= pet_amt * 5;
-		    extra = ((float)move_amt / 50.0) - (move_amt / 50);
+		    extra = move_amt / 50.0 - move_amt / 50;
 		    sect.sct_item[I_OIL] = MAX(oil_amt - move_amt / 50, 0);
 		    if (extra > 0.0)
 			sect.sct_item[I_OIL]
@@ -417,7 +417,7 @@ fuel(void)
 
 		fueled = 1;
 		if ((pet_amt * 5) >= move_amt) {
-		    extra = ((float)move_amt / 5.0) - (move_amt / 5);
+		    extra = move_amt / 5.0 - move_amt / 5;
 		    if (extra > 0.0)
 			item2.land.lnd_item[I_PETROL]
 			    = MAX((pet_amt - move_amt / 5) - 1, 0);
@@ -427,7 +427,7 @@ fuel(void)
 		} else {
 		    item2.land.lnd_item[I_PETROL] = 0;
 		    move_amt -= pet_amt * 5;
-		    extra = ((float)move_amt / 50.0) - (move_amt / 50);
+		    extra = move_amt / 50.0 - move_amt / 50;
 		    item2.land.lnd_item[I_OIL]
 			= MAX(oil_amt - move_amt / 50, 0);
 		    if (extra > 0.0)
diff --git a/src/lib/commands/payo.c b/src/lib/commands/payo.c
index bf735bfa..c8ee9225 100644
--- a/src/lib/commands/payo.c
+++ b/src/lib/commands/payo.c
@@ -99,14 +99,14 @@ payo(void)
 	if (dist < trade_1_dist)
 	    cash = 0;
 	else if (dist < trade_2_dist)
-	    cash = (1.0 + trade_1 * ((float)dist));
+	    cash = 1.0 + trade_1 * dist;
 	else if (dist < trade_3_dist)
-	    cash = (1.0 + trade_2 * ((float)dist));
+	    cash = 1.0 + trade_2 * dist;
 	else
-	    cash = (1.0 + trade_3 * ((float)dist));
+	    cash = 1.0 + trade_3 * dist;
 
 	cash *= mp->m_cost;
-	cash *= (((float)ship.shp_effic) / 100.0);
+	cash *= ship.shp_effic / 100.0;
 
 	if (sect.sct_own && (sect.sct_own != ship.shp_own))
 	    cash *= (1.0 + trade_ally_bonus);
diff --git a/src/lib/commands/scra.c b/src/lib/commands/scra.c
index 9cdba96d..ca0aed71 100644
--- a/src/lib/commands/scra.c
+++ b/src/lib/commands/scra.c
@@ -171,7 +171,7 @@ scra(void)
 		continue;
 	}
 	if (type == EF_SHIP) {
-	    eff = ((float)item.ship.shp_effic / 100.0);
+	    eff = item.ship.shp_effic / 100.0;
 	    mp = &mchr[(int)item.ship.shp_type];
 	    if (opt_TRADESHIPS) {
 		if (mp->m_flags & M_TRADE) {
@@ -249,7 +249,7 @@ scra(void)
 	    item.ship.shp_own = 0;
 	    putship(item.ship.shp_uid, &item.ship);
 	} else if (type == EF_LAND) {
-	    eff = ((float)item.land.lnd_effic / 100.0);
+	    eff = item.land.lnd_effic / 100.0;
 	    lp = &lchr[(int)item.land.lnd_type];
 	    pr("%s", prland(&item.land));
 	    for (i = I_NONE + 1; i <= I_MAX; i++) {
@@ -317,7 +317,7 @@ scra(void)
 	    item.land.lnd_own = 0;
 	    putland(item.land.lnd_uid, &item.land);
 	} else {
-	    eff = ((float)item.land.lnd_effic / 100.0);
+	    eff = item.land.lnd_effic / 100.0;
 	    pp = &plchr[(int)item.plane.pln_type];
 	    pr("%s", prplane(&item.plane));
 	    sect.sct_item[I_LCM] += pp->pl_lcm * 2 / 3 * eff;
diff --git a/src/lib/commands/scut.c b/src/lib/commands/scut.c
index f84d9703..6e1bc780 100644
--- a/src/lib/commands/scut.c
+++ b/src/lib/commands/scut.c
@@ -204,13 +204,13 @@ scuttle_tradeship(struct shpstr *sp, int interactive)
 	if (dist < trade_1_dist)
 	    cash = 0;
 	else if (dist < trade_2_dist)
-	    cash = (1.0 + trade_1 * ((float)dist));
+	    cash = 1.0 + trade_1 * dist;
 	else if (dist < trade_3_dist)
-	    cash = (1.0 + trade_2 * ((float)dist));
+	    cash = 1.0 + trade_2 * dist;
 	else
-	    cash = (1.0 + trade_3 * ((float)dist));
+	    cash = 1.0 + trade_3 * dist;
 	cash *= mp->m_cost;
-	cash *= (((float)sp->shp_effic) / 100.0);
+	cash *= sp->shp_effic / 100.0;
 
 	if (sect.sct_own != sp->shp_own) {
 	    ally_cash = cash * trade_ally_cut;
diff --git a/src/lib/commands/sona.c b/src/lib/commands/sona.c
index e4648b47..8691ad5b 100644
--- a/src/lib/commands/sona.c
+++ b/src/lib/commands/sona.c
@@ -265,7 +265,7 @@ plane_sona(struct emp_qelem *plane_list, int x, int y,
 		pln_identchance(pp, shp_hardtarget(targ), EF_SHIP))
 		continue;
 	    pingrange = MAX(targ->shp_visib, 10) * range / 10;
-	    vrange = ((float)pingrange) * ((float)pp->pln_effic / 200.0);
+	    vrange = pingrange * (pp->pln_effic / 200.0);
 	    dist = mapdist(targ->shp_x, targ->shp_y, x, y);
 	    pingrange = (MAX(pingrange, 2) * targ->shp_effic);
 	    pingrange = roundavg(pingrange / 100.0);
diff --git a/src/lib/subs/aircombat.c b/src/lib/subs/aircombat.c
index e8235201..8b3f8e2e 100644
--- a/src/lib/subs/aircombat.c
+++ b/src/lib/subs/aircombat.c
@@ -625,8 +625,8 @@ ac_dog(struct plist *ap, struct plist *dp)
 	att -= 2;
     if ((dp->pcp->pl_flags & P_F) && dp->bombs != 0)
 	def -= 2;
-    att += ((float)ap->pcp->pl_stealth / 25.0);
-    def += ((float)dp->pcp->pl_stealth / 25.0);
+    att += ap->pcp->pl_stealth / 25.0;
+    def += dp->pcp->pl_stealth / 25.0;
     if (att < 1) {
 	def += 1 - att;
 	att = 1;
@@ -1073,7 +1073,7 @@ getilist(struct emp_qelem *list, natid own, struct emp_qelem *a,
 		&& (pcp->pl_flags & P_V) == 0)
 		continue;
 	}
-	if ((float)petrol < (float)pcp->pl_fuel / 2.0)
+	if (petrol <= pcp->pl_fuel / 2)
 	    continue;
 	/* Finally, is it in the list of planes already in
 	   flight? */
@@ -1160,13 +1160,13 @@ do_evade(struct emp_qelem *bomb_list, struct emp_qelem *esc_list)
     evade = 100.0;
     for (qp = bomb_list->q_forw; qp != bomb_list; qp = qp->q_forw) {
 	plp = (struct plist *)qp;
-	if (evade > ((float)plp->pcp->pl_stealth / 100.0))
-	    evade = (plp->pcp->pl_stealth / 100.0);
+	if (evade > plp->pcp->pl_stealth / 100.0)
+	    evade = plp->pcp->pl_stealth / 100.0;
     }
     for (qp = esc_list->q_forw; qp != esc_list; qp = qp->q_forw) {
 	plp = (struct plist *)qp;
 	if (evade > plp->pcp->pl_stealth / 100.0)
-	    evade = (plp->pcp->pl_stealth / 100.0);
+	    evade = plp->pcp->pl_stealth / 100.0;
     }
 
     if (chance(evade))
diff --git a/src/lib/subs/attsub.c b/src/lib/subs/attsub.c
index b2c00340..5432c429 100644
--- a/src/lib/subs/attsub.c
+++ b/src/lib/subs/attsub.c
@@ -1493,7 +1493,7 @@ att_reacting_units(struct combat *def, struct emp_qelem *list, int a_spy,
 	dtotal = 0;
     snxtitem_all(&ni, EF_LAND);
     while (nxtitem(&ni, &land) &&
-	   (dtotal + new_land * eff < (int)(1.2 * (float)ototal))) {
+	   (dtotal + new_land * eff < (int)(1.2 * ototal))) {
 	if (!land.lnd_own)
 	    continue;
 	if (!land.lnd_rad_max)
diff --git a/src/lib/subs/lndsub.c b/src/lib/subs/lndsub.c
index 60fa0dfd..c55943ce 100644
--- a/src/lib/subs/lndsub.c
+++ b/src/lib/subs/lndsub.c
@@ -1383,7 +1383,7 @@ lnd_fortify (struct lndstr *lp, int hard_amt)
     eng = has_helpful_engineer(lp->lnd_x, lp->lnd_y, lp->lnd_own);
 
     if (eng)
-	hard_amt = ((float)hard_amt * 1.5);
+	hard_amt *= 1.5;
 
     if ((lp->lnd_harden + hard_amt) > land_mob_max)
 	hard_amt = land_mob_max - lp->lnd_harden;
@@ -1394,7 +1394,7 @@ lnd_fortify (struct lndstr *lp, int hard_amt)
     /* Now, if an engineer helped, it's really only 2/3rds of
        that */
     if (eng)
-	mob_used = (int)((float)mob_used / 1.5);
+	mob_used /= 1.5;
 
     /* If we increased it, but not much, we gotta take at least 1
        mob point. */
diff --git a/src/lib/subs/plnsub.c b/src/lib/subs/plnsub.c
index d6a6cb24..c6423ac1 100644
--- a/src/lib/subs/plnsub.c
+++ b/src/lib/subs/plnsub.c
@@ -1146,7 +1146,7 @@ pln_hitchance(struct plnstr *pp, int hardtarget, int type)
 	    acc += 35;
     }
     hitchance = (int)(pp->pln_effic * (1.0 - 0.1 * tfact) *
-		      (1.0 - (float)acc / 100.0)) - hardtarget;
+		      (1.0 - acc / 100.0)) - hardtarget;
 
     /* smooth out the bottom of the graph with asymtote at 5 -KHS */
     if (hitchance < 20)
diff --git a/src/lib/update/land.c b/src/lib/update/land.c
index fe2b2ef9..194e7462 100644
--- a/src/lib/update/land.c
+++ b/src/lib/update/land.c
@@ -276,7 +276,7 @@ landrepair(struct lndstr *land, struct natstr *np,
     if (left > delta)
 	left = delta;
 
-    leftp = ((float)left / 100.0);
+    leftp = left / 100.0;
 
     memset(mvec, 0, sizeof(mvec));
     mvec[I_LCM] = lcm_needed = ldround(lp->l_lcm * leftp, 1);
diff --git a/src/lib/update/plane.c b/src/lib/update/plane.c
index 8aa20f13..3b936003 100644
--- a/src/lib/update/plane.c
+++ b/src/lib/update/plane.c
@@ -191,7 +191,7 @@ prod_plane(int etus, int natnum, int *bp, int buildem)
 	    if (left > delta)
 		left = delta;
 
-	    leftp = ((float)left / 100.0);
+	    leftp = left / 100.0;
 	    memset(mvec, 0, sizeof(mvec));
 	    mvec[I_MILIT] = mil_needed = ldround(plp->pl_crew * leftp, 1);
 	    mvec[I_LCM] = lcm_needed = ldround(plp->pl_lcm * leftp, 1);
diff --git a/src/lib/update/ship.c b/src/lib/update/ship.c
index 80cb5aab..7de8ed8a 100644
--- a/src/lib/update/ship.c
+++ b/src/lib/update/ship.c
@@ -345,7 +345,7 @@ shiprepair(struct shpstr *ship, struct natstr *np,
     if (left > delta)
 	left = delta;
 
-    leftp = ((float)left / 100.0);
+    leftp = left / 100.0;
     memset(mvec, 0, sizeof(mvec));
     mvec[I_LCM] = lcm_needed = ldround(mp->m_lcm * leftp, 1);
     mvec[I_HCM] = hcm_needed = ldround(mp->m_hcm * leftp, 1);